Guides and research on verifying contractors before you hire.
864 articles · Page 8 of 44
April 2026 · 6 min read
New Jersey requires HVAC contractors to be licensed through the Division of Consumer Affairs. Here's how to verify any NJ HVAC contractor, what bond requirements apply, and what to ask before hiring.
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Virginia requires all roofing contractors to hold a Class A, B, or C contractor license through DPOR. Here's how to verify any roofer's credentials, what the license classes mean, and what bond amounts apply.
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Virginia requires electrical contractors to hold a DPOR license with the electrical trade classification. Here's how to verify any Virginia electrician, what the license classes mean, and what bonds and insurance to expect.
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Virginia requires plumbing contractors to hold a DPOR license with the plumbing trade classification. Here's how to verify any Virginia plumber, what the three license classes cover, and what bonds and insurance apply.
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Virginia requires HVAC contractors to hold a DPOR license with the HVAC/R trade classification. Here's how to verify any Virginia HVAC contractor, what the license classes mean for your project, and what bond amounts apply.
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Washington State requires all roofing contractors to be registered with L&I before performing roofing work. Here's how to verify any WA roofer's registration, bond, and insurance through lni.wa.gov.
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Washington State requires electrical contractors to be registered with L&I and individual electricians to hold an L&I electrical license. Here's how to verify any WA electrician through lni.wa.gov.
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Washington requires plumbers to hold individual L&I licenses and plumbing contractors to carry a $6,000 specialty bond. Here's how to verify both at lni.wa.gov before any work starts.
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Washington requires HVAC/R technicians to hold an L&I license and contractors to carry a $6,000 specialty bond. Federal EPA Section 608 certification is also required for refrigerant handling.
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Arizona requires roofing contractors to hold an ROC license (CR-35 classification) with a $5,000 minimum bond. Unlicensed roofing is a Class 1 misdemeanor. Here's how to verify at roc.az.gov.
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Arizona has a two-track system: ROC L-11 license for electrical contractors and a separate DFBLS license for individual electricians. Here's how to verify both before hiring.
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Arizona requires plumbing contractors to hold an ROC license (L-37 classification) with a $5,000 minimum bond. Unlicensed plumbing is a Class 1 misdemeanor. Here's how to verify at roc.az.gov.
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Arizona requires HVAC contractors to hold an ROC license (C-39 classification) with a $5,000 minimum bond. EPA Section 608 certification is required for refrigerant handling. Here's how to verify.
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Massachusetts roofers need both a Construction Supervisor License (CSL) and a Home Improvement Contractor (HIC) registration with a $5,000 bond. Here's how to verify both at mass.gov.
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Wisconsin licenses over 40,000 plumbers through DSPS and requires Master, Journeyman, or Apprentice credentials for anyone performing plumbing work. Here's how to verify any Wisconsin plumber at licensesearch.wi.gov.
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Wisconsin requires HVAC contractors to register through DSPS and residential installers to hold a Dwelling Contractor Qualifier credential. Here's how to verify any Wisconsin HVAC contractor at licensesearch.wi.gov.
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Colorado has no statewide roofing license, but Denver requires local contractor registration and insurance requirements apply statewide. Here's how to verify any Colorado roofer's credentials before signing a contract.
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Colorado licenses electricians through DORA's Office of Electrical Safety and requires a $10,000 bond for electrical contractors. Here's how to verify any Colorado electrician or electrical contractor at dora.colorado.gov.
Read more →April 2026 · 6 min read
Colorado licenses plumbers through the State Plumbing Board at DORA with Master and Journeyman credentials. Here's how to verify any Colorado plumber's license at dora.colorado.gov before work begins.
Read more →April 2026 · 6 min read
Colorado has no statewide HVAC license, but local permits are required statewide and EPA Section 608 certification is federally mandated for refrigerant work. Here's how to verify Colorado HVAC contractors before hiring.
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