Diamond Certified Company Report

Chimney Clean Company

Chimney Sweep
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Chimney Clean Company
61 SURVEYS
2 CONSECUTIVE YEARS
SINCE MARCH 2025
CERT 2852

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61
Verified Customers
Surveyed
Customer Loyalty
Customer Satisfaction
Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance

Company Report Menu

  • Survey Responses (reviews)
  • Diamond Certified Video Player
  • Researched Articles & Profile
  • Capabilities
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  • Expert Contributor Advice & Tips
  • Website & External Feeds

Diamond Certified Company Report SUMMARY UPDATE October 2026

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Chimney Clean Company

Rated Highest in Quality and Helpful Expertise for 2 Consecutive Years.

Quick Summary

  • Diamond Certified since 2025
  • Cleans, inspects, and repairs chimneys and fireplaces for residential clients in Santa Clara County, San Mateo, and Fremont
  • Member of the Golden State Chimney Sweep Guild
  • Family-owned and operated

Top News Updated

COMPANY MILESTONES

Chimney Clean Company is celebrating its 36th anniversary in 2026.

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BLOGS & ARTICLES

Chimney Clean Company recently published several new blogs on its website, including “The Engineering of a Chimney: Why Draft Matters” and “How Creosote Buildup Leads to Chimney Fires.”

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Top Survey Responses

From a recent Diamond Certified Survey Response: “They’re dependable and reliable, and they have good customer service. They found some issues [with my chimney] and were able to fix them that [same] day.”

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From a recent Diamond Certified Survey Response: “I can always count on the work being done efficiently and properly. If there’s an issue, I know I’ll hear about it and there will be a reasonable recommendation for remedying the problem.”

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Trending Projects

Chimney Clean Company recently removed a damaged chimney for a homeowner in San Francisco after an inspection revealed that repairing a crack would require extensive work. The client praised the...

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Chimney Clean Company
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Chimney Clean Company
Chimney Sweep
|
Alameda  San Mateo  Santa Clara Counties
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2 CONSECUTIVE YEARS

Diamond Certified Researched Articles on Chimney Clean Company

researched article

Chimney Clean Company rebuilt this chimney.

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Chimney Clean Company cleans, inspects, and repairs all types of chimneys and fireplaces for homeowners in the South Bay, as far north as San Mateo, and as far northeast as Fremont. In addition to keeping its clients’ chimneys and fireplaces functioning smoothly and safely, the family-owned and operated company offers supplementary services like dryer duct cleaning; chimney rebuilding and relining; gas, wood and electric insert installation; and more.

Chimney Clean Company's success is built on trust and customer care. "We don't look at our customers as transactions—we see them as neighbors who need our help to maintain safe, comfortable homes,” says Founder Dennis Justus. “Whether it's ensuring their chimney is in good working order or making sure their dryer ducts aren't a fire hazard, we treat each customer with the same respect and honesty we would want for ourselves.”

Chimney Clean Company maintains a high standard of service through rigorous employee training and ongoing quality control. “Our technicians go through intensive in-house training to ensure they’re delivering first-rate service,” affirms Office Manager Jennifer Maas. “We even have a dedicated quality control technician who inspects jobs, handles any return visits and retrains technicians as needed. Our customers know they’re getting expert care from a team they can trust.”

Dennis Justus, Owner-Chimney Clean Company
Dennis Justus, Owner

Diamond Certified Researched Capabilities on Chimney Clean Company

Service Area

serving area
Santa Clara County
Fremont in Alameda County
City of San Mateo
Serving All of Santa Clara County, San Mateo and Fremont

Main Services

Chimney Sweep
  • Chimney Cap Replacement
  • Chimney Cleaning
  • Chimney Inspection
  • Chimney Repair
  • Dryer Vent Cleaning
  • Fireplace Cleaning
  • Fireplace Inspection
  • Fireplace Maintenance

Additional Services

Chimney Cleaning, Inspection & Repair
Chimney Rebuilds
Gas, Wood & Electric Insert Installations
Gas Fireplace Cleaning & Inspection
Dryer Duct Cleaning & Installations/Rerouting

Company Info

Hours
Mon
08:30 am - 05:00 pm
Tue
08:30 am - 05:00 pm
Wed
08:30 am - 05:00 pm
Thu
08:30 am - 05:00 pm
Fri
08:30 am - 05:00 pm
Sat
08:00 am - 04:00 pm
Sun
Closed
Closed
Mon – Fri: 8:30am – 5pm
Sat: 8am – 4pm (Service Appointments Only)
Website
Contact
Chimney Clean Company

Capabilities Table

Company Name
Chimney Clean Company
Phone Number
DCID Number
DCID4082651010
Managers
Dennis Justus and Dan Maas, Owners
Years in Industry
40+ (Combined)
# of Employees
7
License
678096
Memberships
Golden State Chimney Sweep Guild, Santa Clara County Association of REALTORS
Insurance
Liability Insurance,
Workers' Compensation
Founded
1990
Customer Type
Residential
Warranties & Guarantees
1-Year Warranty on Labor, Manufacturers’ Warranties on Parts

Brands

Kozy Heat logoKozy Heat
Modern Flames logoModern Flames
Osburn logoOsburn

Select Photos From Chimney Clean Company

1 of 7Picture of A meticulously maintained chimney stands tall against a clear blue sky, symbolizing the Chimney Clean Company's dedication to quality outcomes. Renowned for its expertise, the company ensures high customer satisfaction. Copyright ©2025 Diamond Certified Resource - Chimney Clean Company
A meticulously maintained chimney stands tall against a clear blue sky, symbolizing the Chimney Clean Company's dedication to quality outcomes. Renowned for its expertise, the company ensures high customer satisfaction. Copyright ©2025 Diamond Certified Resource
Picture of A meticulously maintained chimney stands tall against a clear blue sky, symbolizing the Chimney Clean Company's dedication to quality outcomes. Renowned for its expertise, the company ensures high customer satisfaction. Copyright ©2025 Diamond Certified Resource - Chimney Clean Company
Picture of Amidst a clear blue sky, a well-maintained chimney stands as a testament to the Chimney Clean Company's dedication to quality outcomes. This attention to detail reflects their high customer satisfaction ratings. Copyright ©2025 Diamond Certified Resource - Chimney Clean Company
Picture of The Chimney Clean Company highlights their focus on quality outcomes with this meticulously maintained brick chimney, exemplifying their recognized expertise in ensuring safety and aesthetics. Copyright ©2025 Diamond Certified Resource

 - Chimney Clean Company
Picture of A newly installed chimney cap gleams under the sun, reflecting Chimney Clean Company's dedication to quality outcomes. This attention to detail underscores the company's high customer satisfaction ratings. Copyright ©2025 Diamond Certified Resource

 - Chimney Clean Company
Picture of Amid the warmth of brick, a Chimney Clean Company technician diligently cleans a fireplace, ensuring safety and efficiency. With a focus on quality outcomes, their expertise shines through. Copyright ©2025 Diamond Certified Resource - Chimney Clean Company
Picture of A craftsman from Chimney Clean Company expertly dismantles an aged chimney, a testament to the company's focus on quality outcomes and meticulous attention to detail. This careful restoration not only renews the structure but also highlights why the company has consistently achieved a Highest in Quality rating. Copyright ©2025 Diamond Certified Resource

 - Chimney Clean Company

Diamond Certified Expert Contributor Advice & Tips

Dan Maas is co-owner of Chimney Clean Company, a Diamond Certified company. He can be reached at (408) 763-3595 or chimneycleanco@gmail.com.

Dan Maas is co-owner of Chimney Clean Company, a Diamond Certified company. He can be reached at (408) 763-3595 or chimneycleanco@gmail.com.

Dan Maas: Every Chimney Tells a Story

By Caitlyn Stair, Diamond Certified Research Reporter

Dan Maas didn’t set out to become a chimney expert, but life has a way of guiding those with curiosity and dedication down unexpected paths. For him, it’s never just about cleaning chimneys—it’s about protecting families and making a meaningful impact on his community.

Dan spent the first 30 years of his career as a flooring contractor, even running his own business for two decades, but as installation ...

Read Full Article - Dan Maas: Every Chimney Tells a Story

Chimney Clean Company Website and External Feeds

Website

FAQs
By Chimney Clean Company

How often should I have my chimney cleaned?

What’s your process for cleaning and inspecting chimneys?

Do I need to be home while you’re working?

How long will it take to clean my chimney?

Do you service gas fireplaces?

Chimney Clean Company Ratings and Survey Responses (reviews)

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Chimney Clean Company
61 SURVEYS
  • 4.9
  • star image
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  • star image
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2 CONSECUTIVE YEARS
SINCE MARCH 2025
CERT 2852

Diamond Certified Ratings Dashboard

Customer Satisfaction

Customer Loyalty

Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance
Chimney Clean Company

Based in San Jose, CA

4.9 avg. star score from 61 Verified Customer Phone Survey Responses

(Reviews: Scroll down to read them.)

Our surveys of only verified real customers produce the country’s most accurate ratings of local companies. Chimney Clean Company scored Highest in Quality and Helpful Expertise and passed the credential-based checks to earn Diamond Certified.

A Star Equivalent Score is calculated for each verified customer rating by weighting the 1–10 Quality score, the YES/NO Loyalty (intent to return) score and the YES/NO Helpful Expertise score. If Helpful Expertise wasn’t surveyed or didn’t apply, it’s simply not shown.