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Find Diamond Certified companies rated Highest in Quality and Helpful Expertise. Performance Guaranteed.
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    Diamond Certified logo
    Only Earned by Companies Rated
    Highest in Quality and Helpful Expertise

    The Diamond Certified Difference

    Rating Differences

    Integrity

    Certifying Local Companies for 20 Years.

    Rating Differences

    Accuracy

    Only Real Customers are Surveyed.

    Rating Differences

    Relevancy

    The Rating of Quality & Helpful Expertise.

    Rating Differences

    Deep Info

    Deep Company Info

    These 12 Rating Steps Must be Aced to Earn Diamond Certified

    Step 1: Apply

    process steps

    The company must apply to begin the rating process.

    Step 2: Sample

    process steps

    A random sample of typically 400 past customers is collected from all customer files of the applicant company.

    Step 3: Survey

    process steps

    Only real customers are surveyed in confidential telephone research to determine the company's customer satisfaction score based on quality.

    Step 4: Score

    process steps

    To qualify, the company must score Highest in Quality and Helpful Expertise, with a score of 90 or above on a 100 scale.

    Step 5: Credentials

    process steps

    We confirm that the company has required insurances and valid state-mandated credentials.

    Step 6: Practices

    process steps

    The company must perform to contract, have customer-friendly business practices and stand behind its work.

    Step 7: Commitment

    process steps

    The company agrees to adhere to the Diamond Certified Customer Satisfaction Principles.

    Step 8: Award

    process steps

    If the company's quality rating, business practices and credentials meet our high standards, it is awarded Diamond Certified.

    Step 9: Monitor

    process steps

    We conduct ongoing surveys to ensure the company is maintaining high customer satisfaction and loyalty.

    Step 10: Mediate

    process steps

    The company agrees to participate in Diamond Certified mediation if necessary.

    Step 11: Guarantee

    process steps

    The Diamond Certified Performance Guarantee provides added assurance of the company's commitment to customer satisfaction.

    Step 12: Quality

    process steps

    Companies that are able to qualify for and maintain their Diamond Certified awards are much more likely to deliver quality to their customers.

    How Diamond Certified Compares to Review Sites

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    Versus
    • star rating
    • star rating
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    Most Review Sites

    Why You'll Feel Confident in Choosing a Diamond Certified Company

    The Meaning of the Diamond Certified Symbol
    The Diamond Certified Performance Guarantee
    What is Helpful Expertise and Why Does it Matter So Much?
    Our Preliminary Rating Steps
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    The Meaning of the Diamond Certified Symbol

    Like the Yin and Yang symbol, this image depicts the principle of perfectly balanced forces. One side is the customer desiring the highest quality. The other side is the Diamond Certified company prepared to deliver on all its promises.
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      Performance Guarantee

      A dispute may arise from an unmet expectation or a simple misunderstanding. Many disagreements are resolved after the parties work with each other using the contract and industry standards for guidance.
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        What is Helpful Expertise and Why Does it Matter So Much?

        Nowadays, there’s so much information pouring forth from the internet that you probably feel like you should know more about certain subjects that impact your life. So, before you hire a local company, you want to feel that they have the expertise to help you understand the topic at hand and give you confidence in how they actually perform the work. That is the meaning of Helpful Expertise.
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          Our Preliminary Rating Steps

          In order to be featured as a top rated service provider on this website, each company must complete the following five steps:
          1. Meet or exceed a ONE AllRatings star score of 4.5
          2. Have an active business license and be in good standing with the CSLB (when required)
          3. Pass an internet background search
          4. Have a satisfactory complaint status with the Better Business Bureau
          5. Have all four previous steps verified by a research specialist...
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          Sections in Our Ratings
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          Local companies rated Highest in Quality and Helpful Expertise

          Performance Guaranteed
          performance guaranteed

          Contract Performance guaranteed.Backed by mediation.

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          Helpful expertise

          Comprehensive guides for each industry. Project advice, maintenance calendars and key local resources.

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