Black Diamond Roofing vs Star Waterproofing and Roofing
East Bay Roofing Comparison · Updated January 2026
| Black Diamond Roofing | Star Waterproofing and Roofing | |
|---|---|---|
| Rating | ★ 4.0 | ★ 4.3 |
| Years Licensed | 11 years | 8 years |
| License # | 996268 | 1036279 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Walnut Creek, CA |
| Website | www.blackdiamondroofs.com | www.starwaterproofingco.com |
Our Analysis
Star Waterproofing and Roofing is based in Walnut Creek and has been licensed for 8 years with an active status, along with workers’ compensation coverage and a $25,000 bond. Reviews often describe strength in diagnosing leaks, explaining recommended repairs, and providing detailed estimates. Customers also reference work on decks, balconies, and flat or low-slope roofs, including multi-unit and commercial buildings. Feedback highlights clear communication, scheduling responsiveness, and jobsite protection, with some mentions of follow-up support after completion. As with Black Diamond, a portion of reviews report dissatisfaction tied to communication or service experiences.
Why choose Black Diamond Roofing?
- ✓ You want a Concord-based contractor serving Contra Costa County with 11 years of active licensure.
- ✓ Your project involves HOA coordination or community-managed residential properties, which is specifically mentioned in the company’s service context.
- ✓ You value punctuality and a professional, problem-solving approach as commonly described by customers.
- ✓ You are comfortable with a process that may include an initial assessment followed by a separate proposal step before work details are finalized.
Why choose Star Waterproofing and Roofing?
- ✓ You want a Walnut Creek-based contractor serving Contra Costa County with 8 years of active licensure.
- ✓ Your needs include leak diagnosis and repair explanations, with reviews frequently noting detailed estimates and clear communication.
- ✓ Your project may involve decks, balconies, or flat/low-slope roofing, including multi-unit or commercial building contexts mentioned by customers.
- ✓ You prefer a contractor that customers often associate with jobsite protection practices and occasional follow-up support after completion.
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Frequently Asked Questions
Yes. Both Black Diamond Roofing and Star Waterproofing and Roofing are listed as carrying workers’ compensation coverage and maintaining a $25,000 bond.
Black Diamond Roofing is based in Concord, and Star Waterproofing and Roofing is based in Walnut Creek. Both serve Contra Costa County, California.
Black Diamond Roofing is listed as licensed for 11 years, while Star Waterproofing and Roofing is listed as licensed for 8 years. Both have active license status.
Reviews mention work involving decks, balconies, and flat or low-slope roofs, including projects for multi-unit and commercial buildings, along with leak diagnosis and repair recommendations.
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.