Black Diamond Roofing vs Williams Roofing
East Bay Roofing Comparison · Updated January 2026
| Black Diamond Roofing | Williams Roofing | |
|---|---|---|
| Rating | ★ 4.0 | ★ 4.6 |
| Years Licensed | 11 years | 32 years |
| License # | 996268 | 687391 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Fremont, CA |
| Website | www.blackdiamondroofs.com | williamsroofing.net |
Our Analysis
Service positioning differs mainly by geography and the way projects are described. Black Diamond Roofing is presented as supporting roofing services and repairs, including projects coordinated through homeowner associations, which may be relevant for community-managed properties in and around Concord. Customer descriptions for Black Diamond Roofing include professionalism, punctuality, and problem-solving, along with notes that some jobs may require additional steps such as returning with a separate proposal after an initial assessment.
Williams Roofing’s customer descriptions emphasize responsiveness, clear communication, timely scheduling, and meeting expectations from contact through completion. Reviews commonly reference both repairs (including leak work) and full roof replacements, and also mention a straightforward approach to recommendations and pricing, with comments that unnecessary work is not pushed. Choosing between them may come down to service area needs, project type, and the process you prefer for assessment and quoting.
Why choose Black Diamond Roofing?
- ✓ Based in Concord and positioned to serve Contra Costa County, which may be convenient for nearby homeowners and community-managed properties.
- ✓ Licensed for 11 years with an active status, plus workers’ compensation coverage and a $25,000 bond.
- ✓ Described as professional and punctual, with communication that can support HOA coordination.
- ✓ Some feedback notes that after an initial assessment, additional steps may be needed (such as returning with a separate proposal), which can affect timing.
Why choose Williams Roofing?
- ✓ Based in Fremont (Alameda County), which may better fit projects closer to the East Bay/South East Bay area.
- ✓ Licensed for 32 years with an active status, plus workers’ compensation coverage and a $25,000 bond.
- ✓ Customer descriptions often mention responsiveness, clear communication, and timely scheduling through completion.
- ✓ Reviews commonly reference both repairs (including leaks) and full roof replacements, along with a straightforward approach to recommendations and pricing.
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Frequently Asked Questions
Yes. Both are listed with an active license status, workers’ compensation coverage, and a $25,000 bond.
Williams Roofing is listed as licensed for 32 years, while Black Diamond Roofing is listed as licensed for 11 years.
Black Diamond Roofing is described as coordinating projects through homeowner associations and supporting community-managed properties in and around Concord.
Williams Roofing’s review summary commonly references both roof repairs and full roof replacements, including addressing leaks and completing projects as promised.
Other East Bay Roofing Comparisons
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified January 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.