Diamond Certified Company Spotlight Series: Contra Costa County (Part 1)

<img src="https://s3.us-east-2.amazonaws.com/dcr-apis/wp_contents/uploads/DCR-ADMIN/AdobeStock_450648869.jpeg" alt="undefined" style="height: auto;width: auto"/> We’ve all felt the joy of choosing a good company in Contra Costa County and, unfortunately, the pain when we mistakenly choose a bad one. The problem is, every company claims to be good, yet despite these glowing claims some provide inconsistent quality while others are downright dishonest. We’ve solved this problem for you with Diamond Certified Resource. Only local companies independently rated Highest in Quality and Helpful Expertise earn Diamond Certified. Our rigorous <a href="http://www.diamondcertified.org/the-certification" target="_self">rating and certification process</a> starts with the in-depth pass/fail rating of each company’s customer satisfaction, license and insurances. Most companies can’t pass our rating and earn Diamond Certified, and every Diamond Certified company must continue to deliver on its promises to you, the consumer. That’s why we conduct ongoing customer satisfaction research and credential-based ratings and monitor each company’s performance. Here’s a partial list of all the Diamond Certified companies that serve Contra Costa County. Stay tuned for Part 2!  <a href="https://www.diamondcertified.org/report/a-ramos-construction-inc/" target="_self">A Ramos Construction, Inc.</a> Since 2006, A Ramos Construction, Inc. has provided full-service residential construction throughout Contra Costa and Alameda Counties, handling kitchen and bathroom remodels, room additions, foundation work, flooring installation, and fire and water damage restoration. What distinguishes this team is its commitment to doing the job right, even when structural or framing challenges require extra time and problem-solving. Owner Roberto Ramos and his crew keep homeowners informed throughout the process, answering questions and explaining options so there are no surprises. Because they focus on underlying issues instead of rushing through them, clients receive results that look great and perform well for years.  <a href="https://www.diamondcertified.org/report/abbey-carpets-by-fashion-floors/" target="_self">Abbey Carpets by Fashion Floors</a> Abbey Carpets by Fashion Floors has served Contra Costa County since 1981, offering carpet, hardwood, laminate, vinyl and tile from leading manufacturers at its Antioch showroom. The company creates a relaxed, no-pressure environment where knowledgeable sales professionals guide homeowners toward flooring that fits both their lifestyles and long-term goals. Many team members understand installation firsthand, which helps customers avoid costly mistakes and choose products that will hold up over time. With clear pricing and straightforward advice, Abbey Carpets by Fashion Floors makes the selection process feel informed and confident rather than overwhelming. <a href="https://www.diamondcertified.org/report/abrew-repair-and-construction/" target="_self">Abrew Repair and Construction</a> Family-owned since 1965, Abrew Repair and Construction brings decades of experience to whole-house renovations, structural repairs, additions, and commercial projects throughout the Greater Bay Area. The company combines technical expertise with consistent communication, holding regular meetings and providing updates so clients always understand progress and next steps. They protect properties carefully during construction and collaborate with independent consultants when needed to ensure accurate scopes of work. As a result, homeowners work with licensed professionals who manage complex projects thoughtfully and deliver lasting quality. <a href="https://www.diamondcertified.org/report/abril-roofing-inc/" target="_self">Abril Roofing, Inc.</a> Abril Roofing, Inc. specializes in polyurethane foam roofing for flat and low-slope buildings throughout the Bay Area. This focused expertise allows the family-owned team to install high-density foam systems that improve drainage, enhance insulation and help reduce long-term energy costs. Master Foam Technicians oversee each project from start to finish, ensuring careful application and consistent quality control. With a 15-year transferable warranty and maintenance programs designed to extend roof performance, Abril Roofing provides a durable solution backed by experienced professionals who understand the system inside and out. <a href="https://www.diamondcertified.org/report/absolute-best-care/" target="_self">Absolute Best Care</a> Absolute Best Care provides professional tree services and landscape improvements throughout Alameda, Contra Costa, San Mateo, and Santa Clara Counties. From planting and pruning to removals, pavers and retaining walls, the company combines hands-on experience with a strong understanding of arboriculture standards. Rather than simply fulfilling requests that may harm long-term tree health, the team follows International Society of Arboriculture guidelines and explains why proper techniques matter. That approach helps homeowners protect both the beauty and structural integrity of their landscapes over time. <a href="https://www.diamondcertified.org/report/absolute-plumbing-and-drain/" target="_self">Absolute Plumbing and Drain</a> Absolute Plumbing and Drain offers comprehensive plumbing services throughout Contra Costa County and neighboring areas, including trenchless sewer replacements, drainage systems, and kitchen and bathroom upgrades. The company welcomes complex troubleshooting work and approaches each project with a problem-solving mindset that many contractors avoid. Because much of plumbing work remains hidden underground or behind walls, the team takes time to explain findings clearly and outline practical options before work begins. Homeowners benefit from honest recommendations, quality materials and skilled execution delivered by licensed professionals who value transparency. <a href="http://www.diamondcertified.org/report/acme-sunshades-enterprise-inc" target="_self">Acme Sunshades Enterprise Inc.</a> Founded in 1922, Acme Sunshades Enterprise Inc. designs, manufactures, and installs custom awnings, canopies, pergolas, and specialty fabric structures throughout the Bay Area. The company manages each phase in-house, from design renderings and permitting to fabrication and installation, which keeps projects efficient and highly customized. Whether homeowners prefer traditional styles or modern architectural lines, the team tailors every installation to complement the property’s appearance and function. After more than a century in business, Acme Sunshades continues to deliver craftsmanship supported by deep local experience. <a href="http://www.diamondcertified.org/report/acustruct" target="_self">AcuStruct</a> AcuStruct focuses on foundation repair, soil stabilization, retaining walls and structural corrective work across Northern California. The company holds General Engineering (A) and General Building (B) licenses, which allows its experienced crews to complete projects without relying on subcontractors. By partnering with independent engineering consultants, AcuStruct helps homeowners define accurate scopes of work and avoid conflicts of interest. When structural stability becomes a concern, property owners benefit from a contractor that combines technical expertise, owned equipment and disciplined project management to deliver reliable results. <a href="http://www.diamondcertified.org/report/advanced-plumbing-and-rooter-service" target="_self">Advanced Plumbing and Rooter Service</a> Advanced Plumbing and Rooter Service has delivered residential and commercial plumbing services throughout Contra Costa and Alameda Counties since 1999, handling everything from fixture repairs and tankless water heater replacements to trenchless sewer line work. The company builds long-term relationships by taking a personalized approach, and many clients return year after year because they trust the team’s consistency and professionalism. Technicians stay current through factory training on the latest plumbing technology, which allows them to diagnose problems quickly and recommend lasting solutions. Because plumbing issues rarely happen at convenient times, the company offers extended hours and 24-hour emergency service so homeowners can always reach a knowledgeable professional. <a href="http://www.diamondcertified.org/report/ais-heating-air-conditioning" target="_self">AIS Heating & Air Conditioning</a> AIS Heating & Air Conditioning installs and repairs HVAC systems for residential and commercial clients across the Greater Bay Area, and the company also handles water heaters, duct cleaning, and energy audits that improve comfort and energy performance. Much of its business comes from referrals, which reflects the professionalism and steady quality the team delivers on every project. Owner Daniel Sojkic remains hands-on and personally checks completed work, backing new systems with performance guarantees and detailed estimates. Instead of surprising customers with change orders, the company focuses on clear pricing, experienced technicians and results that keep homes comfortable year-round. <a href="http://www.diamondcertified.org/report/all-n-one-pest-eliminators" target="_self">All N One Pest Eliminators</a> All N One Pest Eliminators provides comprehensive pest control services for homes and businesses in Contra Costa, Alameda, Solano, and Napa Counties. The company handles insects, rodents, attic cleanouts, sanitation and restoration work, which means clients don’t need to juggle multiple contractors to solve one problem. The team prioritizes personalized service, quick response times, and customized maintenance plans that address both immediate infestations and long-term prevention. By following up after service and responding promptly to urgent situations, All N One Pest Eliminators helps property owners protect their health, safety and peace of mind. <a href="https://www.diamondcertified.org/report/alley-cat/" target="_self">Alley Cat</a> Alley Cat specializes in rodent exclusion, cleanup, sanitation, and prevention services for residential and commercial clients across the Bay Area. The company combines eco-friendly methods with detailed inspections and free evaluations so property owners understand the full scope of an infestation before work begins. Instead of applying temporary fixes, the team focuses on sealing entry points, mapping repairs with custom software and delivering long-term solutions backed by a three-year warranty. Because attic and crawl space problems can affect indoor air quality and overall health, Alley Cat approaches each project with a high level of precision and quality control. <a href="https://www.diamondcertified.org/report/alltek-restoration-inc/" target="_self">Alltek Restoration, Inc.</a> Alltek Restoration, Inc. provides fire, water, smoke, and storm damage restoration along with reconstruction and remodeling services throughout Northern and Central California. CEO Andrew Easton brings third-generation construction expertise to every project, overseeing work and guiding clients through what can often be a stressful recovery process. The company handles emergency response, insurance coordination and full rebuilds, which simplifies the experience for homeowners who need both speed and craftsmanship. By combining hands-on construction knowledge with organized project management, Alltek Restoration helps clients move from damage to full recovery with confidence. <a href="https://www.diamondcertified.org/report/alva-flooring-inc/" target="_self">Alva Flooring Inc.</a> Alva Flooring Inc. refinishes, repairs, recoats, and installs hardwood flooring for residential clients in Contra Costa, Alameda, and Marin Counties. The company takes a meticulous approach to preparation and finishing, using high-quality products and professional-grade equipment, including HEPA filtration systems that reduce dust and protect indoor air quality. Owners Ezequiel and Isbet Alvarez prioritize communication from the first consultation through the final walkthrough, helping homeowners understand the refinishing process and feel comfortable every step of the way.  <a href="https://www.diamondcertified.org/report/atticelite-insulation-solutions/" target="_self">AtticElite Insulation Solutions</a> AtticElite Insulation Solutions provides attic and crawl space cleaning, insulation replacement, radiant barrier installation, and encapsulation services throughout the Bay Area. Owner Milo Makarewicz takes a hands-on approach, sending a foreman to every job and documenting work carefully to maintain high quality control standards. The company focuses on energy efficiency and indoor comfort, offering honest recommendations and efficient single-day service whenever possible. By combining second-generation industry knowledge with detailed oversight and clear communication, AtticElite helps homeowners solve insulation issues with lasting results. <a href="https://www.diamondcertified.org/report/baltodanos-drywall-and-painting/" target="_self">Baltodano’s Drywall and Painting</a> Baltodano’s Drywall and Painting installs drywall for new construction and remodeling projects across the East Bay, San Francisco, and Marin County, with specialized expertise in custom hand-texturing techniques. Owner Luis Baltodano emphasizes jobsite cleanliness and proper preparation, which sets the tone for professional, respectful service. The team uses high-quality materials and modern equipment, including advanced HEPA sanding systems that minimize dust and protect surrounding areas. By focusing on doing the work correctly the first time and staying current with industry innovations, Baltodano’s Drywall and Painting delivers walls that look refined and hold up over time. <a href="http://www.diamondcertified.org/report/bay-area-drainage-inc" target="_self">Bay Area Drainage, Inc.</a> Bay Area Drainage, Inc. designs and installs custom drainage systems for residential and commercial properties in parts of Contra Costa and Alameda Counties. President Wayne Ortland stays hands-on and visits jobsites daily, while a site superintendent oversees work throughout the day to keep quality and timelines on track. The company specializes in French drain systems that can tie into downspouts, sump pumps and area drains, and it installs them with a minimally invasive tunneling method designed to protect established plants and root systems. <a href="https://www.diamondcertified.org/report/bay-valley-roofing/" target="_self">Bay Valley Roofing</a> Bay Valley Roofing serves homeowners throughout Contra Costa, Alameda, and Solano Counties with roofing, gutters, solar installations, and even home additions. As a family-owned GAF Master Elite installer, the company works on a wide range of roof types, including metal, composition shingles, PVC and GAF Timberline solar shingles. Owner Raul Diaz prioritizes customer service with daily updates and clear completion targets, which helps homeowners feel involved without needing to micromanage the process. <a href="https://www.diamondcertified.org/report/benjamin-franklin-plumbing-30/" target="_self">Benjamin Franklin Plumbing</a> Benjamin Franklin Plumbing provides residential plumbing services across the Greater Bay Area, covering everything from drains, toilets and disposals to sewer cleaning, repiping and water heater service. The company puts a major emphasis on reliability, including a punctuality promise that pays you back when a technician arrives late (up to a set limit). Plumbers complete ongoing training and the company requires background checks and drug testing, so homeowners get both technical skill and added peace of mind. Because the trucks carry extensive parts inventory and the team stays available around the clock, Benjamin Franklin Plumbing can often solve problems faster and with fewer follow-up visits. <a href="http://www.diamondcertified.org/report/black-diamond-paver-stones-landscape-inc" target="_self">Black Diamond Paver Stones & Landscape, Inc.</a> Black Diamond Paver Stones & Landscape, Inc. has served Northern California since 2004, designing and building outdoor spaces that include driveways, patios, retaining walls, steps, pergolas, outdoor kitchens, fire features, and synthetic or natural lawns. The company starts with a free basic digital design and estimate so homeowners can visualize the plan and understand what they’re getting before construction begins. President Roger Van Alst emphasizes a guided, supportive process, which helps clients navigate the inevitable curveballs that can come with landscape construction. <a href="https://www.diamondcertified.org/report/california-aqua-pros-inc" target="_self">California Aqua Pros Inc.</a> California Aqua Pros Inc. provides pool and pond services in Contra Costa, Alameda, Santa Clara, and San Mateo Counties, handling everything from routine cleanouts to major pool construction and remodeling. This family-run operation brings third- and fourth-generation experience to its work, which shows up in the way the team plans, communicates and executes projects of every size. Operations Manager Jared Purkey and his crew focus on responsiveness, follow-up and clear updates, so homeowners are never left guessing about next steps. Because the company competes on service and quality rather than cutting corners to chase the lowest bid, clients get realistic planning, durable results, and water features like waterfalls and fountainscapes installed with care. <a href="https://www.diamondcertified.org/report/california-concrete-overlay-inc" target="_self">California Concrete Overlay Inc.</a> California Concrete Overlay Inc. helps homeowners upgrade patios, driveways, sidewalks, and pool decks in Contra Costa County and parts of Alameda County by resurfacing existing concrete instead of tearing it out. This approach keeps projects cleaner and less disruptive while still delivering a refreshed, decorative finish that can last for decades when installed correctly. Owner Esaul Esquivel and his team walk clients through colors, patterns, and performance expectations. The company follows International Concrete Repair Institute standards and offers cool concrete overlays that can reduce surface temperatures. <a href="http://www.diamondcertified.org/report/california-heating-and-cooling" target="_self">California Heating and Cooling</a> California Heating and Cooling installs and services heating and air conditioning systems for homeowners in Contra Costa, San Francisco, Alameda, and Solano Counties. Owner Raul Galvez leads with a quality-first mindset and backs it up with a simple standard: If something isn’t right, the company makes it right. The crew brings strong troubleshooting skills to complex HVAC problems, and office staff follow up to confirm homeowners feel satisfied after the work.  <a href="https://www.diamondcertified.org/report/calraters-inc/" target="_self">CalRATERS, Inc.</a> CalRATERS, Inc. supports homeowners across the Bay Area with home energy audits, testing, and guidance for solving problems like high utility bills, hot-and-cold spots, leaky ducts, poor insulation, and building-envelope leaks. The company takes a whole-home approach, so clients get a clear picture of how energy moves through the house and which upgrades will deliver the best return. Co-owners Marty Kerr and Nikole Jonsson also help homeowners navigate programs and rebates, including coordinating with skilled contractors and managing required testing after improvements. Because energy upgrades can feel confusing without a roadmap, CalRATERS focuses on one-on-one service that simplifies decisions and helps homeowners invest confidently in comfort, efficiency, and long-term performance. <a href="https://www.diamondcertified.org/report/cappstone-inc/" target="_self">Cappstone, Inc.</a> Cappstone, Inc. delivers managed facility maintenance for a wide range of Bay Area commercial properties, and the company backs its work with environmentally responsible practices as a certified Bay Area Green Business that uses Green Seal-certified products. The team leans hard into systems, safety and clear communication, so clients spend less time chasing issues and more time running their operations. Dedicated account managers stay assigned to each facility, meet onsite with clients and adjust service plans as needs change. <a href="https://www.diamondcertified.org/report/cardinal-builder-inc/" target="_self">Cardinal Builder, Inc</a> Cardinal Builder, Inc has been remodeling and restoring East Bay homes since 1983, offering design/build remodeling for kitchens, bathrooms, and additions with in-house architectural and engineering support. Homeowners can also visit its Pleasanton showroom to review plans, CAD renderings, and detailed estimates created with modern software and a process built for accuracy. The team takes extra time to bid carefully, and when something unexpected pops up, they pause to explain the situation and walk clients through change order options. <a href="https://www.diamondcertified.org/report/carlos-pools-landscaping" target="_self">Carlos Pools & Landscaping</a> Carlos Pools & Landscaping designs and builds custom pools, spas, waterfalls, and ponds in Contra Costa County and parts of Alameda County. Owner Carlos Munoz keeps the process transparent with daily updates and a group text that connects clients directly with leadership, designers, and the superintendent. That communication style helps homeowners stay informed without feeling overwhelmed, especially during complex yard transformations that involve multiple phases. And because the company uses its own employees instead of juggling subcontractors, projects stay more predictable and quality stays consistent from excavation through final details. <a href="https://www.diamondcertified.org/report/closet-factory/" target="_self">Closet Factory</a> Closet Factory has served the Greater Bay Area since 1983, creating custom organization systems for closets, garages, home offices, pantries, laundry rooms, and specialty spaces like wine cellars and craft rooms. The company designs, engineers, manufactures and installs in-house, which keeps quality tight and scheduling smoother. Free design consultations and digital tools help homeowners visualize finishes and accessories before they commit. <a href="https://www.diamondcertified.org/report/contra-costa-door" target="_self">Contra Costa Door</a> Contra Costa Door has served Contra Costa, Alameda, Solano and Napa Counties since 1953, installing and repairing garage doors along with automatic gates and access control systems. The company focuses on long-term service, so the relationship doesn’t end when the door goes up. Owner Dale Brooks emphasizes integrity and follow-through, and the team’s trained technicians guide homeowners toward reliable solutions using professional installation methods and quality products. With a showroom and a deep bench of experienced tradespeople, Contra Costa Door gives clients the confidence of a local company that will still answer the phone years down the road. <a href="https://www.diamondcertified.org/report/dahme-construction/" target="_self">Dahme Construction</a> Dahme Construction remodels kitchens and bathrooms, builds room additions, and handles a wide range of renovation work throughout Contra Costa County, drawing on more than 40 years of experience. Owner Darrin Dahme Sr. stays hands-on and prioritizes listening, which helps homeowners feel heard while still getting honest guidance on code, safety, and what will actually work in the space. The company keeps communication steady throughout the job, so clients understand what’s happening and what comes next as the project moves forward. <a href="http://www.diamondcertified.org/report/danville-hardwood-company-incorporated" target="_self">Danville Hardwood Company Incorporated</a> Danville Hardwood Company Incorporated offers a wide range of wood flooring options along with refinishing, cleaning, and recoating services in Contra Costa County and the East Bay. Staff members focus specifically on hardwood, so they can explain differences in species, grades, finishes and performance in a way that helps homeowners choose confidently. Installers bring deep experience across installation types and can add custom borders and inserts for a more tailored look. With in-home consultations and a longstanding local presence, Danville Hardwood combines product expertise with end-to-end service. <a href="http://www.diamondcertified.org/report/delta-transmission" target="_self">Delta Transmission</a> Delta Transmission has served Antioch drivers since 1958, specializing in transmission service, repair, replacement and custom rebuilds, with brake repairs available for most makes and models. Owner Chester Kniss runs a small, family-owned shop that treats customers like regulars, not ticket numbers, and he takes time to explain what’s happening and what options make sense. Once he completes a thorough diagnosis, he honors that price even if he later finds additional issues. With free transmission and differential diagnoses, warranty support that doesn’t turn into an argument, and help handling insurance paperwork, Delta Transmission offers straightforward service that keeps vehicles reliable and customers confident. <a href="https://www.diamondcertified.org/report/devengenzo-company" target="_self">Devengenzo & Company</a> Devengenzo & Company provides construction, engineering, and drainage services in Contra Costa and Alameda Counties, with deep expertise in surface and subsurface drainage. The company also tackles irrigation systems, sewer work, retaining walls, foundations, framing, kitchen and bath remodels, ADUs, and even landslide-related repairs. President Nick Devengenzo stays hands-on and keeps the business intentionally small, which means clients get direct attention and steady oversight from start to finish. Because the company holds both general engineering and general contracting licenses, homeowners can solve complex indoor and outdoor problems under one coordinated plan. <a href="http://www.diamondcertified.org/report/diablo-valley-cabinetry" target="_self">Diablo Valley Cabinetry</a> Diablo Valley Cabinetry has been serving East Bay homeowners, contractors, designers and architects since 1982, delivering cabinetry design and supply along with installation and interior design support. The team also helps specify countertops, plumbing fixtures, and specialty hardware, which makes it easier to keep a remodel cohesive instead of piecing decisions together across multiple vendors. Clients work with a dedicated service representative who stays with the project through completion. With a San Ramon showroom and decades of experience navigating the ups and downs of remodeling, Diablo Valley Cabinetry focuses on creating functional, beautiful spaces. <a href="http://www.diamondcertified.org/report/dig-demo" target="_self">Dig & Demo</a> Dig & Demo provides environmentally-friendly hauling, demolition and site-clearing services across the Bay Area, with a specialty in residential swimming pool removal. The company uses its own rubber-tracked and residential-friendly equipment, which helps crews access tight backyards while minimizing damage to surrounding property. As a Bay Area Green Business, Dig & Demo recycles at least half of what it receives and often pushes well beyond that, and it donates usable items to local nonprofits. Homeowners also get upfront pricing, free estimates and clear explanations of the work. <a href="http://www.diamondcertified.org/report/dimension-construction-inc" target="_self">Dimension Construction Inc</a> Dimension Construction Inc delivers foundation and structural services across the Bay Area, including work on drainage systems, driveways, retaining walls, excavation and demolition. Owner Joao Nicolau brings more than 20 years of industry experience and a personal, detail-focused approach that aims for a true finished product, not “good enough.” The company owns much of its heavy equipment, which helps it work efficiently and avoid rental-driven delays and costs that can inflate quotes. Because the team handles foundation work in-house and keeps the jobsite as clean and organized as possible, homeowners get a more controlled process. <a href="http://www.diamondcertified.org/report/dublin-car-tek" target="_self">Dublin Car Tek</a> Dublin Car Tek has served Contra Costa and Alameda County motorists since 1999, offering general repairs for foreign and domestic vehicles along with smog inspections, brakes, tires, and fleet and RV services. Owner Tim Johnson runs the shop like a family business, and many customers return across generations because the team communicates openly and treats people with respect. The shop uses factory-designated diagnostic equipment, employs ASE-certified technicians and includes an open floor plan that lets customers speak directly with the techs working on their vehicles.  <a href="http://www.diamondcertified.org/report/duggans-serra-mortuary" target="_self">Duggan’s Serra Mortuary</a> Duggan’s Serra Mortuary has served Bay Area families for generations, combining a long history (dating back to 1885) with deeply personal, family-owned care. The multilingual staff supports families across cultures and faiths with traditional and cremation services, and the facility includes private chapels, reception areas, and practical conveniences like ample parking. The team also offers preplanning support through “My Funeral, My Way®,” which helps families make clear decisions with less stress later. <a href="https://www.diamondcertified.org/report/dynamic-roofing-inc/" target="_self">Dynamic Roofing Inc.</a> Dynamic Roofing Inc. has served Contra Costa, Solano and Alameda Counties since 2006, installing and maintaining asphalt and tile roofing systems while also handling gutters, dry rot repair, and reroofing. As a family-owned, multi-generation company, the team focuses on keeping homeowners comfortable through what can feel like a high-stress project. They communicate consistently, explain options clearly and avoid hidden fees, which helps clients make smart choices without second-guessing every step. With experienced technicians, quality materials, and manufacturer certifications that can support extended warranties up to 50 years on labor and materials, Dynamic Roofing offers a steady, transparent approach to roofing. <a href="https://www.diamondcertified.org/report/east-bay-pc-construction-inc/" target="_self">East Bay PC Construction, Inc.</a> East Bay PC Construction, Inc. remodels kitchens and bathrooms, builds room additions, and handles a range of residential and commercial remodeling projects across the Greater East Bay, San Francisco, and parts of Solano County. The team also tackles specialty work like deck building and siding repair, and it offers free estimates to help homeowners plan confidently. Owner Juan Sandoval emphasizes direct, long-term relationships, so clients get steady guidance, clear answers and support through every phase of the remodel. Because the company stays small and focused, it pays close attention to jobsite cleanliness, communication and finishing work as promised in the contract. <a href="http://www.diamondcertified.org/report/engineered-soil-repairs-inc" target="_self">Engineered Soil Repairs, Inc.</a> Engineered Soil Repairs, Inc. solves complex soil and foundation problems throughout much of Northern California, including landslide repair, creek bed stabilization, underpinning, releveling, retaining walls and drainage systems. Founded in 1992, the firm stands out with in-house registered engineers who assess the issue, develop the repair plans, manage permits and inspections, and keep the work coordinated under one roof. Crews bring deep field experience, and foremen and superintendents stay actively involved on site so projects keep moving with strong oversight. Because the company pairs engineering and construction in one design/build process, clients get tighter accountability and repairs designed to last. <a href="https://www.diamondcertified.org/report/fixem-appliance-repair/" target="_self">FixEm Appliance Repair</a> FixEm Appliance Repair services washers, dryers, ovens, refrigerators, dishwashers, and other major appliances for homeowners in Contra Costa and Alameda Counties. Owners Moshe Spund and Natan Framowitz work on major and minor brands, and they also offer preventive maintenance that helps appliances run better and last longer. The team leads with transparency, so clients hear upfront when a repair may require parts, multiple steps, or a tough call on whether repair or replacement makes more sense. Because they prioritize education and clear explanations, homeowners leave each visit with practical tips that reduce repeat problems and protect their investments. <a href="https://www.diamondcertified.org/report/frontline-electrical-services/" target="_self">Frontline Electrical Services</a> Frontline Electrical Services provides residential and commercial electrical work in Contra Costa, Solano, and Napa Counties, ranging from panel upgrades to full rewires and EV charging installations. President Lee Sherwood brings an engineering mindset to every project, which helps the team design solutions that solve today’s needs while preparing the home for future upgrades like solar, HVAC changes or additional electrical loads. Communication stays central, so clients get thoughtful questions, clear recommendations and respectful guidance instead of vague promises. <a href="https://www.diamondcertified.org/report/gar-cal-corporation/" target="_self">Gar-Cal Corporation</a> Gar-Cal Corporation delivers residential construction services in Contra Costa and Alameda Counties, managing kitchen and bathroom remodels, additions, ADUs, and new construction with a focus on smooth, well-coordinated execution. As an NKBA member, the team stays aligned with modern design standards while still treating every home like a one-off project that deserves careful planning and precision. Owner Angel Garcia emphasizes communication and flexibility, especially when homeowners refine choices midstream, so the final space matches the vision instead of fighting it. <a href="http://www.diamondcertified.org/report/general-roofing-company" target="_self">General Roofing Company</a> General Roofing Company has served the Bay Area since 1924, and the multi-generation family business still runs on craftsmanship, integrity, and reliability. The team installs and maintains a wide range of roofing systems, including shingles, shake, slate, tile and flat. Training and safety stay ongoing, with background checks for employees and regular product and safety education that supports consistent quality. Because the company refuses to chase low bids by cutting corners, homeowners get detail-focused workmanship and a process designed to finish the job correctly. <a href="https://www.diamondcertified.org/report/gilor-remodeling-group" target="_self">Gilor Remodeling Group</a> Gilor Remodeling Group delivers high-end kitchen, bathroom, and whole-home remodeling for homeowners in Los Angeles and the Bay Area, with in-house expertise that keeps complex projects organized and design-forward. Owner Gill Mimran leans heavily on communication, offering clear updates and guidance through the many decisions that come with premium finishes and custom details. Quality control shows up in material selection, careful walkthroughs and a follow-up visit to confirm the work has settled the way it should. <a href="https://www.diamondcertified.org/report/golden-state-builders-group" target="_self">Golden State Builders Group</a> Golden State Builders Group serves homeowners in Contra Costa, Alameda, and San Francisco Counties with exterior renovations that change how a home looks and performs. The family-owned team installs and repairs vinyl, fiber cement, and wood siding; builds custom decks; replaces windows; and offers waterproofing and fireproofing to reduce moisture damage and increase fire resistance. Owner Ben Strashko prioritizes responsive customer care, so clients stay involved in key decisions and get clear options upfront instead of surprises later. Because project managers approve each phase before moving forward, homeowners get cleaner jobsites, smoother inspections and quality control that holds up even months after the work wraps up. <a href="https://www.diamondcertified.org/report/got-watts-electric-solar-hvac/" target="_self">Got Watts Electric, Solar & HVAC</a> Got Watts Electric, Solar & HVAC helps homeowners and businesses across the East Bay move toward electrification with an integrated mix of solar, backup batteries, high-efficiency heat pumps, and the electrical upgrades that support them. The company employs its own electricians and HVAC technicians, so projects stay coordinated without subcontractor handoffs that can create delays or uneven quality. President Jeremy Carlock and his team take a whole-home approach, which means they plan panel capacity, EV charging, and future equipment needs. <a href="https://www.diamondcertified.org/report/green-living-builders-llc/" target="_self">Green Living Builders LLC</a> Green Living Builders LLC delivers full-service remodeling and construction across the East Bay, handling kitchen and bathroom remodels, additions, ADUs, house lifts, decks, seismic upgrades, and comprehensive renovations for both residential and commercial clients. Principal Rolf Bell brings third-generation contractor experience and a practical, sustainable mindset, so projects can include smart efficiency upgrades and even net-zero strategies when they fit the home and the goals. He also knows how to keep complex schedules moving, especially when multiple trades and deadlines collide. Because the company works comfortably on older homes and detailed repairs, homeowners get craftsmanship and problem-solving that respects the original structure while improving how the house lives today. <a href="https://www.diamondcertified.org/report/handymen-llc" target="_self">Handymen LLC</a> Handymen LLC provides home maintenance and repair services in parts of Contra Costa and Solano Counties, covering everything from minor plumbing and electrical work to gutter cleaning, fence repairs, and lock and security system installation. Co-owners Ryan Houseman and David Kelly stay directly involved, and the company’s two-plus person staffing model adds quality control on every job without turning the process into a production line. Real-time scheduling updates keep homeowners in the loop, and the team stays upfront about what they can and can’t do while still helping clients find the right path forward. Because they build relationships instead of chasing one-off transactions, Handymen LLC focuses on careful workmanship, clear communication, and preventing small issues from becoming bigger repairs. <a href="https://www.diamondcertified.org/report/hassler-heating-air-conditioning-inc/" target="_self">Hassler Heating & Air Conditioning, LLC</a> Hassler Heating & Air Conditioning, LLC supports California electrification with full-service HVAC work that includes maintenance, repairs, system replacements, heat pump conversions, ductless solutions, and water heaters, plus the electrical upgrades that often come with modern home systems. Every job starts with an in-home evaluation so equipment matches the house for comfort and efficiency, and the team may recommend air sealing, insulation, zoning, or window improvements when those upgrades make the HVAC investment perform better. General Manager Marcus Mueller positions Hassler as both an HVAC contractor and a home performance partner, which helps homeowners solve comfort, indoor health, and energy efficiency as one connected plan. And because the company understands regional incentive programs, clients get guidance on rebates and a managed process that keeps the project moving cleanly from start to finish. <a href="http://www.diamondcertified.org/report/high-definition-solar" target="_self">High Definition Solar</a> High Definition Solar installs solar power systems for homeowners across Northern California, managing the full process from financial and energy analysis to permits, paperwork, and installation. Before the team designs anything, technicians evaluate the roof carefully, which helps them match the system to both the structure and the homeowner’s goals. The company also offers roofing services like dry rot repair and efficiency upgrades. With a solar production guarantee and long-term warranties on panels, inverters, and labor, High Definition Solar gives clients a more secure, well-supported path to long-term energy savings. <a href="http://www.diamondcertified.org/report/home-healing-renovations-inc" target="_self">Home Healing Renovations, Inc.</a> Home Healing Renovations, Inc. is a Berkeley-based design + build remodeling company that guides East Bay homeowners through kitchens, bathrooms, additions, and whole-home renovations with a clear plan from concept through construction. Owner Jason Johnson brings Green building and permaculture certifications to the table, so clients can incorporate sustainable choices without losing sight of budget, schedule or day-to-day livability. Because Home Healing Renovations also handles structural improvements, seismic retrofits, and remediation work, clients can solve deeper problems while still ending up with balanced, beautiful finished spaces. <a href="https://www.diamondcertified.org/report/home-living-window-fashions/" target="_self">Home Living Window Fashions</a> Home Living Window Fashions designs and installs premium window coverings and outdoor shades across the Greater Bay Area, including plantation shutters, custom drapery, motorized shades and blinds, retractable awnings, power shades, sail shades, and more. President Shem Isaac focuses on “demonstrable difference,” so the company only sells products it believes in and supports them with trained expert installation. Instead of quoting from a distance, Home Living sends a decorator into the home to measure, review options, and build an order around the client’s space and goals. With steady order updates, careful quality checks after installation and strong follow-through, this family-run company helps homeowners invest in comfort, privacy, light control, and outdoor usability that lasts. <a href="https://www.diamondcertified.org/report/hometown-heating-air-conditioning/" target="_self">Hometown Heating & Air Conditioning</a> Hometown Heating & Air Conditioning is a family-owned HVAC company founded in 2012 and led by Brian Waskow alongside Jessica and Alex Lobban, serving homeowners in Contra Costa, Alameda, and Solano Counties. The team installs, repairs, and maintains central heating and cooling systems, and it offers free estimates on replacements like furnaces, air conditioners, ductless systems, ductwork, zoning, heat pumps, and indoor air quality audits. They hire highly trained technicians who use modern equipment and proven best practices, which helps homeowners feel confident in both the process and the results. And because the company personalizes service and stays available 24/7, clients get clear communication and fast support when comfort issues show up at the worst possible time. <a href="http://www.diamondcertified.org/report/horticultural-services-ltd" target="_self">Horticultural Services, LTD</a> Horticultural Services, LTD provides tree care for residential and commercial properties throughout Contra Costa County, including trimming, view clearing, removals, stump grinding, pest control, and specialty pruning that protects heritage-quality trees. Owner Chris Chapman is an ISA Certified Arborist with more than 30 years of experience, and he starts with onsite walkthroughs that identify issues and lay out options that begin with the least invasive approach. The team uses small-footprint equipment to reduce landscape damage and runs through work orders carefully so clients understand what’s happening. Because the company also offers consultation and maintenance programs, property owners can protect mature trees and keep landscapes healthy before and after construction, not just react to problems later. <a href="http://www.diamondcertified.org/report/independent-exchange-services-inc" target="_self">Independent Exchange Services, Inc.</a> Independent Exchange Services, Inc. facilitates IRS Section 1031 exchanges for real estate investors throughout the Greater Bay Area and beyond, supporting delayed, simultaneous, reverse, built-to-suit, and even international exchanges as a qualified intermediary. The firm operates as a boutique practice within the 1031 Strategies & Services Group, so clients get a personalized, service-driven experience instead of a high-volume processing model. President Ian Bunje and his team focus solely on 1031 work, and they tailor each transaction to the investor’s timeline, questions, and risk points while staying available beyond typical business hours. They also flag what they can’t do (like acting as a tax advisor), so investors know where to bring in the right experts while still keeping the exchange compliant and on track. <a href="https://www.diamondcertified.org/report/insul-techs-inc" target="_self">Insul-Techs Inc</a> Insul-Techs Inc provides insulation and attic services across much of the Bay Area, installing, removing, and repairing spray foam and fiberglass insulation while also handling air sealing, weatherization, soundproofing, and attic cleaning and sanitation. Owner Luis Ramos takes a customer-first approach that starts with education, honest guidance, and clear expectations so clients understand what will improve comfort and energy efficiency in their specific spaces. He stays hands-on in project management and trains crews carefully, which helps maintain consistent workmanship from start to finish. <a href="http://www.diamondcertified.org/report/j-js-final-coat-painting-inc" target="_self">J & J’s Final Coat Painting, Inc.</a> J & J’s Final Coat Painting, Inc. has served homes and businesses throughout the Greater East Bay since 1986, delivering interior and exterior painting along with retexturing and shop-sprayed cabinetry finishes. Owners Joe and Jill Sabel emphasize thorough prep work and frequent jobsite supervision, and they keep customers informed when scope changes so nothing feels sudden or unclear. The team uses premium products from manufacturers like Sherwin-Williams and Benjamin Moore, and it applies paint with methods like back-rolling that take longer but hold up better over time. <a href="https://www.diamondcertified.org/report/jv-gardening-and-landscaping-inc" target="_self">JV Gardening and Landscaping Inc.</a> JV Gardening and Landscaping Inc. provides full-service landscaping across the Bay Area, using in-house design and construction capabilities to manage projects from concept through installation. The company handles core landscape builds and also specializes in outdoor lighting, artificial grass, and irrigation and drainage systems that improve both function and curb appeal. Owner Juan Lopez stays actively involved, communicates consistently and works alongside crews to keep quality control tight at every phase. Because clients can reach the team easily by call, text or email, homeowners stay in the loop and get a collaborative experience that keeps the project moving smoothly toward the finished vision.