Trusted Commercial Re-Roofing Solutions for Simi Valley Businesses
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Commercial Re-Roofing & Roof Replacement in Simi Valley
At GreatWay Roofing, we conduct our business in a manner that elevates how roofing contractors are perceived by our industrial and retail clientele alike. We understand that commercial roofing requires a higher standard of transparency and precision. Customer service is not just a catchphrase here—it is the foundation of our reputation in Simi Valley.
The GreatWay Advantage
We don’t just patch problems; we provide long-term security. Every project is backed by our Limited Lifetime Workmanship Warranty, ensuring that our installation quality matches the durability of the materials we use. To provide the most robust protection possible, we partner with industry-leading manufacturers to offer premium systems, including:
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Fluid-Applied Systems: High-performance coatings from Western Colloid.
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Silicone Solutions: Advanced moisture protection from Apoc.
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SA Cap Sheets: Proven reliability and durability from CertainTeed.
Whether you are managing a retail center or an industrial complex, we bring the same commitment to excellence and clear communication that has made us Simi Valley’s trusted roofing partner for decades.
GreatWay Roofing
4518 Industrial St
Simi Valley, CA 93063
(805) 523-2550
LIMITED LIFETIME WORKMANSHIP WARRANTY
You trust us with your commercial building, and we take that seriously. We pay attention to every detail through a rigorous jobsite checklist before, during, and at the completion of your job. Combine that with Manufacturer Certified craftsmen, proper supervision, and great company benefits that attract the best in the industry, and you get the strongest workmanship warranty in west Southern California.
The GreatWay Lifetime Guarantee warranties our workmanship for as long you own your building. This includes a 10-year transferable warranty that extends coverage to your building’s next owner for up to 10 years from the installation date, should you sell it in that time.*
GreatWay Roofing establishes itself as the most reliable roofing contractor in Southern California by providing the strongest workmanship warranty. We provide the highest quality workmanship and service throughout San Fernando Valley, Santa Clarita Valley, and Ventura County. Roofing Contractor-related questions? Call GreatWay Southern California / Thousand Oaks roofers for more details on how the Workmanship Lifetime Warranty can work for you!
*The GreatWay Roofing Limited Lifetime Workmanship Warranty is for complete re-roofs, only. Repairs are not automatically warranted. We recommend checking your contract for specific warranty details pertaining to your roof.
Signs Your Commercial Building Needs a Re-Roof
Persistent Membrane Blisters and/or Wrinkles: When a flat roof membrane wrinkles, it can prevent proper drainage and place stress on seams, increasing the risk of water intrusion.
Loss of Granules: Granules protect the membrane from UV and weather; significant loss typically indicates the roof is aging and nearing the end of its lifespan.
Faulty Equipment Seals: Worn seals, loose flashing, or failed curbs around rooftop HVAC equipment and skylights can allow water to spread beneath the membrane.
Clogged Roof Drains: Debris buildup prevents proper runoff, causing water to pool. This standing water increases pressure on seams, flashing, and penetrations.
Ponding Water: Depressions in a flat roof trap water, accelerating membrane wear and leading to leaks.
Commercial Project Tip: While many minor repairs under 100 square feet do not require a permit in Simi Valley, a full commercial re-roofing project involves a multi-stage inspection process with the city. We handle the entire permitting and inspection workflow to ensure your building meets current safety and Title 24 energy codes. You can view the full
Minimum Requirements for Commercial & Low-Slope Re-Roofing in Simi Valley, CA
Commercial and low-slope re-roof projects in Simi Valley are subject to local permitting requirements and statewide building and energy codes.
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Permitting: In most cases, a building permit is required when re-roofing a significant portion of a commercial roof.
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Code Compliance: All work must comply with the California Building Code (CBC) and California Energy Code (Title 24).
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Materials: Systems must be installed using approved, fire-rated materials designed for low-slope applications, such as fluid-applied acrylic, silicone, or similar systems.
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Structural Standards: The roof assembly must meet structural and drainage standards, ensuring proper slope and water runoff, even on flat roofs.
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Cool Roof Standards: Many projects are required to meet Title 24 “cool roof” standards to reduce heat absorption, involving materials with verified solar reflectance and thermal performance ratings.
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Insulation & Documentation: Depending on the scope, updated insulation levels, manufacturer specifications, and product documentation may be required for final inspection approval.
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Need a quote for damage? See our Simi Valley Commercial Roof Repairs page.
Ask about an ongoing contract with our Commercial Inspection & Maintenance plans in Simi Valley.
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REVIEWS
WHAT OUR CLIENTS ARE SAYING
Tim and Brandon sent updates at every step including pictures of their work in real time.
We are very pleased and have contracted them for another property.
Highly recommend.
The price was great (as much as it can be for a roof, no small purchase), and the crew was really fantastic. They were professional and got the work done quickly. They had to put sheathing on my roof, since it’s old and didn’t have any underneath (!), and the whole project still only took 4 days.
For me, the best thing was that the crew cleaned up every day. The yard was clear, and there were no nails or debris hanging around. It’s a little thing that was really nice to see— it was really nice to go outside in the afternoon and not worry about stepping on anything/ having that peace to move around in the middle of a project.
I’d recommend this company to anyone.
This company is a class act and I am so pleased to have picked GreatWay Roofing who kept me informed thru email and sent photos as the project was moving ahead.
Great customer service, knowledgeable courteous workers and a satisfied customer says it all
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