Black Diamond Roofing vs Alpha Roofing
East Bay Roofing Comparison · Updated January 2026
| Black Diamond Roofing | Alpha Roofing | |
|---|---|---|
| Rating | ★ 4.0 | ★ 5.0 |
| Years Licensed | 11 years | 1 years |
| License # | 996268 | 1129832 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Oakland, CA |
| Website | www.blackdiamondroofs.com | alpharoofing.com |
Our Analysis
In the review summaries provided, Black Diamond Roofing is described as professional and punctual, with communication and coordination that can support ongoing work for HOA communities. The summary also notes that some jobs may require additional steps, such as returning with a separate proposal after an initial assessment, and that experiences are mixed, including some less positive service outcomes.
Alpha Roofing’s review summary emphasizes professionalism and organization, with clear communication from initial contact through completion, including explanations of work and regular updates. It also mentions punctual crews, efficient scheduling, attention to workmanship and finishing details, cleanup at the end of the project, and responsiveness to leak concerns with timely site visits. Based on the data provided, the comparison most clearly differentiates the companies by service area, time licensed, and the themes highlighted in customer feedback summaries.
Why choose Black Diamond Roofing?
- ✓ You want a contractor based in Concord serving Contra Costa County, including support for HOA-coordinated roofing work.
- ✓ You prefer a provider with a longer licensing history (11 years) while still holding an active license status.
- ✓ You value documented workers’ compensation coverage and a $25,000 bond as part of contractor selection.
- ✓ You’re comfortable with a process that may include follow-up steps (such as a separate proposal after an initial assessment), noting that the summarized feedback includes mixed outcomes.
Why choose Alpha Roofing?
- ✓ You need a contractor based in Oakland serving Alameda County and want an actively licensed provider.
- ✓ You are looking for a company described as organized, with clear communication from estimate through completion and regular job updates.
- ✓ You value operational details mentioned in the summary, such as punctual crews, efficient scheduling, cleanup, and attention to finishing details.
- ✓ You want a contractor noted as responsive to leak concerns with timely site visits, alongside workers’ compensation coverage and a $25,000 bond.
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Frequently Asked Questions
Yes. Both Black Diamond Roofing and Alpha Roofing are listed with active license status and both carry workers’ compensation coverage.
Yes. Each company is listed as maintaining a $25,000 bond.
Black Diamond Roofing has been licensed for 11 years, while Alpha Roofing has been licensed for 1 year.
Black Diamond Roofing is based in Concord (Contra Costa County), and Alpha Roofing is based in Oakland (Alameda County). Choosing between them may depend on where your property is located and which county you need service in.
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.