Black Diamond Roofing vs Sierra Roofing and Solar
East Bay Roofing Comparison · Updated January 2026
| Black Diamond Roofing | Sierra Roofing and Solar | |
|---|---|---|
| Rating | ★ 4.0 | ★ 4.8 |
| Years Licensed | 11 years | 22 years |
| License # | 996268 | 835854 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Dublin, CA |
| Website | www.blackdiamondroofs.com | www.sierraroofing.com |
Our Analysis
Sierra Roofing and Solar is located in Dublin (Alameda County) and has been licensed for 22 years, also with an active status, workers’ compensation coverage, and a $25,000 bond. Customer feedback themes for Sierra more consistently reference the estimate-to-completion process, including thorough inspections, clear explanations, and detailed quotes outlining scope. Reviews also commonly mention workmanship across roof replacements, repairs, gutter projects, and attention to cleanup, as well as communication during consultations and follow-up.
For Black Diamond Roofing, review themes include professionalism, punctuality, and responsiveness, with notes about coordination that can support HOA communities. Some feedback indicates the process may include additional steps, such as returning with a separate proposal after an initial assessment, and experiences appear mixed in service outcomes.
Why choose Black Diamond Roofing?
- ✓ You want a Concord-based contractor serving Contra Costa County, including residential and HOA-coordinated roofing work.
- ✓ You prefer a provider with an active license, workers’ compensation coverage, and a documented $25,000 bond.
- ✓ You value punctuality and professional communication, which are recurring themes in customer feedback.
- ✓ You are comfortable with an assessment process that may involve follow-up steps (such as receiving a separate proposal after an initial visit).
Why choose Sierra Roofing and Solar?
- ✓ You want a Dublin-based contractor in Alameda County with longer time licensed (22 years) and an active license.
- ✓ You want documented workers’ compensation coverage and a $25,000 bond.
- ✓ You prefer an estimate process described as thorough, with clear explanations and detailed quotes outlining scope.
- ✓ Your project may include roofing plus related work such as gutters or solar-related services, and you can plan ahead if scheduling requires lead time.
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Frequently Asked Questions
Yes. Both list workers’ compensation coverage and a $25,000 bond, along with active license status.
Sierra Roofing and Solar lists 22 years licensed, while Black Diamond Roofing lists 11 years licensed.
Black Diamond Roofing’s description specifically mentions projects coordinated through homeowner associations.
For Sierra Roofing and Solar, feedback mentions roof replacements, repairs, gutter projects, and solar-related services, along with inspections and detailed quotes. For Black Diamond Roofing, feedback focuses on professionalism, punctuality, communication, and problem-solving during roofing service interactions.
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.