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Williams Roofing vs Integrity Roofing Systems
Alameda Roofing Contractors Comparison · Updated March 2026
Williams Roofing brings 32 years of licensing versus Integrity Roofing Systems' 7 years, both with strong communication but different depth of experience.
| Williams Roofing | Integrity Roofing Systems | |
|---|---|---|
| Rating | ★ 4.6 | ★ 5.0 |
| Years Licensed | 32 years | 7 years |
| License # | 687391 | 1046268 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Fremont, CA | Pleasanton, CA |
| Website | williamsroofing.net | www.integrityroofingpleasanton.com |
Key Differences
What Customers Say
Williams Roofing
Customers consistently emphasize Williams Roofing's honest, straightforward approach and reliable leak repair work that addresses problems without unnecessary upselling.
Integrity Roofing Systems
Customers highlight Integrity Roofing Systems' thorough documentation with photos, organized crews, and structured communication throughout efficient replacement projects.
Key Takeaway: Williams earns praise for diagnostic honesty and repair expertise, while Integrity stands out for project organization and detailed documentation on full replacements.
Customer Reviews
Williams Roofing
Met all expectations and finished as promised. Thanks
A very honest company. Have done repairs before and Steve will not sell you anything you don't need. Repairs done before are still good and price was very fair. No one else will touch my roof.
A good friend of our family gave us a referral to contact Williams Roofing. Steve cam out right away, my fathers house had a good size leak in garage area, we were so happy they were able to replace t...
Integrity Roofing Systems
The owner, Jamin, did a wonder job on both our roof repairs & installing skylights! Jamin is as honest as it gets! I highly recommend!
They redid my roof. Were a great value for the quality of work that they did. Roof looks great now!
Integrity Roofing Systems was excellent from start to finish. They took a thoughtful, diagnostic approach to a tile roof leak, avoided unnecessary scope, and clearly explained what needed to be repair...
Consider Williams Roofing if...
- ✓ Your roof has persistent or mysterious leaks that require experienced diagnostic skills built over decades of troubleshooting different systems and failure points.
- ✓ You're looking for targeted repairs rather than full replacement, and want a contractor known for honest assessments that focus on what's actually needed.
- ✓ You prefer a veteran contractor whose 32-year track record suggests they'll still be around if warranty issues arise years from now.
- ✓ Your project is straightforward and you value a no-frills, reliable approach over detailed documentation and project management tools.
Consider Integrity Roofing Systems if...
- ✓ You're planning a full roof replacement and want thorough documentation including photos, detailed scopes, and organized crews that complete projects efficiently.
- ✓ Your roof may need solar preparation or you want a contractor comfortable coordinating with solar installers and assessing structural readiness.
- ✓ You appreciate structured communication tools like group messaging and proactive updates throughout the project timeline.
- ✓ Your project might include related work like gutter replacement, tile repair, or addressing rot discovered during tear-off, and you want one contractor handling multiple aspects.
Questions to Ask Before Hiring
- → Ask Williams how they approach complex leak diagnosis on older roofs and request examples of challenging leak sources they've identified in homes similar to yours.
- → Ask Integrity about their crew stability and how many full replacement projects they've completed in the past two years to gauge depth beyond their 7-year licensing period.
- → If your roof is over 20 years old, ask both contractors about their experience with your specific roofing material and any age-related complications they typically encounter.
The Bottom Line
Williams Roofing is the stronger choice if you need leak diagnosis, targeted repairs, or want the assurance of a 32-year veteran contractor with deep troubleshooting experience. Their straightforward, honest approach and proven track record with repair work that lasts makes them particularly suited for older roofs or persistent leak issues. Choose Integrity Roofing Systems if you're planning a full replacement and value thorough documentation, organized project management, and a contractor who handles related work like gutters or solar preparation. Both are properly licensed and insured, but Williams' three decades in business provide meaningfully more experience diagnosing hidden problems and handling the unexpected situations that arise in roofing work.
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Frequently Asked Questions
For truly straightforward tear-off and replacement on a simple roof, the gap matters less. However, Williams' 32 years means more experience identifying hidden issues like inadequate ventilation, unusual framing, or substrate problems that only become visible during tear-off. If your home is older or has had previous roof work, that diagnostic experience becomes more valuable.
Williams Roofing has stronger feedback specifically around leak diagnosis and repair work that holds up over time, with 32 years of troubleshooting experience. While Integrity also handles leak repairs and responds quickly, their reviews emphasize full replacements more than targeted repair expertise. For urgent leak situations, Williams' focus and depth in this area gives them an edge.
Yes, this shifts toward Integrity Roofing Systems, which explicitly handles solar readiness assessments and has experience coordinating with solar installers. Their detailed documentation approach with photos also helps solar companies understand the roof condition. Williams can certainly handle the roofing work, but you'd want to confirm their familiarity with solar preparation requirements.
Both companies receive consistent praise for honest recommendations without upselling pressure. Williams is specifically noted for focusing only on needed repairs, while Integrity is described as addressing unexpected issues like rot during tear-off while keeping customers informed. Their similar bonds and high owner involvement suggest both operate transparently, though you should get any additional work in writing before proceeding.
Looking for the Best?
See our ranked list of top roofing contractors in Alameda.
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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