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Acker Roofing vs Thor Contracting Corporation
Contra Costa Roofing Contractors Comparison · Updated March 2026
Acker Roofing brings three times the licensure history and broader diagnostic experience, while Thor Contracting offers faster completion timelines for straightforward projects.
| Acker Roofing | Thor Contracting Corporation | |
|---|---|---|
| Rating | ★ 4.9 | ★ 4.9 |
| Years Licensed | 12 years | 4 years |
| License # | 993338 | 1093228 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | El Sobrante, CA |
| Website | ackerroofing.com | thorcontractingcorporation.com |
Key Differences
What Customers Say
Acker Roofing
Customers emphasize Acker's thorough inspections, detailed explanations during complex troubleshooting, and ability to handle complications like storm damage, solar coordination, and chimney leak diagnosis.
Thor Contracting Corporation
Customers highlight Thor's fast completion timelines, budget-conscious pricing, and efficient execution of straightforward roofing repairs, installations, and maintenance.
Key Takeaway: Acker's reviews describe diagnostic depth and problem-solving in complex scenarios, while Thor's reviews focus on speed, efficiency, and staying within budget on more routine projects.
Customer Reviews
Acker Roofing
They are quick to respond and have work quality they honor the work warranty no questions asked why rain or shine they come to repair
Acker Roofing did a great job of replacing our roof. They listened to my specific needs, found a good solution, and troubleshooted problem areas. They were able to fit us into their schedule and the j...
Dean and Acker came recommended to us by a State Farm insurance agent, and we can see why. Dean quickly turned around a fair quote for roofing our house. Rodigo and his partner worked diligently on ev...
Thor Contracting Corporation
Alex arrived right on time within 10 minutes. He was able to give me a price as we went over the details. He knew the inspector that came to do the inspection from prior roof. All the workers were pol...
This company is highly responsive very professional and worked with my budget and even saved me a Little money. To the high work quality I received and the time frame it all got done in was all to the...
Alex has been a great resource. My clients that I've sent to him have all enjoyed his professionalism, patience and honesty with his work.
Consider Acker Roofing if...
- ✓ Your roof is older or you suspect hidden issues like dry rot, inadequate ventilation, or structural concerns that require experienced diagnosis beyond surface-level assessment.
- ✓ You have solar panels that need removal and reinstallation, or your project requires coordination with other trades and careful sequencing.
- ✓ Your situation involves storm damage, insurance documentation, or troubleshooting persistent leaks where the source isn't obvious.
- ✓ You value detailed explanations during inspections and want a contractor who has navigated a wide range of roofing complications over 12 years.
Consider Thor Contracting Corporation if...
- ✓ Your project is a straightforward roof repair, installation, or maintenance job without complicating factors, and speed of completion is a priority.
- ✓ You're working within a tight budget and want a contractor known for finding cost-effective solutions while maintaining quality standards.
- ✓ You need the work done quickly, potentially within a compressed timeline or while you're away from the property.
- ✓ Your roof is newer or the scope is clearly defined without need for extensive diagnostic work or coordination with other contractors.
Questions to Ask Before Hiring
- → Ask Acker how they handle unexpected findings during tear-off, such as dry rot or inadequate decking, and what their process is for explaining additional costs.
- → Ask Thor for references from projects completed in the last year that match your scope, particularly if your roof is older than 15 years.
- → If your project involves solar panels or other trades, ask Thor about their experience coordinating these elements compared to standard installations.
- → Ask both contractors what their typical timeline is for your specific project type and what factors could extend that schedule.
The Bottom Line
If your roof is older, involves complications like solar panels or chimney issues, or you suspect hidden problems that require diagnostic expertise, Acker Roofing's 12 years of experience and documented track record handling complex scenarios makes them the stronger choice. Their customer feedback consistently describes thorough inspections and clear explanations when things get complicated. Choose Thor Contracting if you have a straightforward repair or installation, value fast completion, and are working within a tighter budget. Their 4 years is sufficient for standard projects, and their reputation for speed and efficiency is well-established. For most homeowners dealing with older roofs or uncertainty about underlying conditions, Acker's additional 8 years of field experience provides meaningful peace of mind.
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Frequently Asked Questions
It depends on your roof's condition and age. For a straightforward replacement on a newer home with no complications, Thor's 4 years is sufficient. But if your roof is 20+ years old, Acker's 12 years means more exposure to hidden issues like inadequate ventilation, concealed water damage, or outdated installation methods that require corrective action. Experience matters most when things don't go as planned during tear-off.
Thor Contracting's reviews consistently emphasize fast completion timelines and crews finishing within tight windows, making them the better choice if speed is your priority. Acker's feedback focuses more on thoroughness and coordination rather than rapid turnaround. If you need your roof completed in days rather than weeks and the project is straightforward, Thor has the edge.
Acker Roofing has specific customer feedback mentioning coordination with solar companies for panel removal and reinstallation, indicating direct experience with this complication. Thor's reviews don't reference solar coordination. For a project requiring this level of coordination and sequencing with another trade, Acker's documented experience makes them the safer choice.
The $25,000 bond provides identical protection regardless of experience, but a more experienced contractor is statistically less likely to create a situation where you'd need to file a bond claim. Acker's 12 years suggests more refined processes for estimating, managing complications, and completing work as agreed. That said, both companies maintain workers comp and active licenses, meeting legal requirements for homeowner protection.
Looking for the Best?
See our ranked list of top roofing contractors in Contra Costa.
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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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