Serving Los Angeles County homeowners and businesses for 17+ years. Owens Corning Preferred Contractor. Licensed, insured, and backed by 5‑star reviews across every platform.
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Industry-recognized, community-trusted — the credentials that set us apart from every other roofer in Los Angeles County.
Named San Gabriel Valley's Best Roofing Company for 2025 — recognized for excellence in craftsmanship, service, and customer satisfaction.
Certified by Owens Corning — North America's largest roofing manufacturer — meaning access to enhanced warranties and the highest-quality materials available.
Fully licensed by the California State License Board (#1112937) and fully insured — protecting your property and your investment from day one.
Top-rated on Google, Yelp, Angi, BBB, Thumbtack, and BuildZoom. Over 500 completed projects with an unblemished 5-star reputation.
Certified Owens Corning contractor, giving customers access to premium roofing systems and exclusive manufacturer warranties on every installation.
Authorized Malarkey installer — delivering industry-leading shingles with superior wind resistance, impact rating, and environmental performance.
Whether you own a single-family home or a large commercial complex, TopCal delivers expert roofing solutions for every property type — on time and on budget.
Complete solutions for single-family and multi-family homes — new installs, re-roofing, full replacements, and repairs using Owens Corning premium shingles.
Get Instant EstimateTPO, EPDM, torch-down, and coatings for offices, retail centers, warehouses, HOAs, and industrial buildings — engineered for longevity with minimal disruption.
Request Commercial QuoteFull roof tear-off and replacement using premium materials. We handle all permits, disposal, and leave your property spotless after every job.
Get Free QuoteExpert diagnosis and repair of leaks, damaged flashing, cracked tiles, and structural issues — preserving your roof and preventing costly damage.
Get Free QuoteFuture-proof your home with a solar-ready roof installation — reinforced decking, upgraded flashing, and optimized layout for maximum solar output.
Get Free QuoteStorm damage? Active leak? We provide 24/7 rapid-response emergency service across all of LA County — same-day inspections available.
Call Now 24/7TopCal installs every major roofing system — from Owens Corning architectural shingles for homes to TPO, torch-down, and EPDM flat-roof systems for commercial properties. Every install meets manufacturer specs and comes backed by a workmanship warranty.
The most popular roofing material in California — asphalt shingles offer an unbeatable combination of affordability, durability, and curb appeal. Available in architectural (dimensional) and 3-tab styles in dozens of colors.
A signature of Southern California architecture — clay and concrete tiles provide unmatched longevity, natural insulation, and a timeless Mediterranean or Spanish-style aesthetic ideal for LA County homes.
The industry's leading single-ply flat roofing membrane — TPO offers outstanding UV resistance, heat-welded seams for superior leak protection, and ENERGY STAR® compliance for commercial buildings in California.
A durable, heat-applied roofing system for flat and low-slope roofs — torch-down (modified bitumen) creates a seamless, waterproof membrane that handles the thermal expansion of California's hot summers exceptionally well.
A specialized flat-roof finishing technique where a raised perimeter border frames the roof edge — creating a clean, architectural look while reinforcing waterproofing at the most vulnerable edge sections of the roof.
EPDM (ethylene propylene diene monomer) is a premium rubber roofing membrane widely used on commercial flat roofs. Highly resistant to ozone, UV rays, and temperature extremes — making it ideal for year-round California conditions.
Modern metal roofing systems — including standing seam and metal shingles — deliver unparalleled longevity, fire resistance, and energy efficiency. Increasingly popular for both upscale residential properties and commercial applications in California.
Extend the life of an existing roof by 10–15 years with a professional elastomeric or silicone coating system — a cost-effective alternative to full replacement that meets California Title 24 cool-roof energy requirements.
Classic wood shake and cedar shingles offer a natural, rustic aesthetic that complements craftsman and bungalow-style homes throughout Pasadena and the San Gabriel Valley — with proper fire treatment meeting California building codes.
From small retail storefronts to large industrial complexes, TopCal delivers commercial roofing systems engineered for maximum durability, energy efficiency, and minimal business disruption — on schedule and on budget.
Single-ply thermoplastic membrane — the #1 commercial flat roofing choice in California. Heat-welded seams create a fully monolithic waterproof layer with ENERGY STAR® compliance.
A battle-tested, heat-applied asphalt system ideal for flat and low-slope commercial roofs. Creates a seamless, high-tensile waterproof membrane that handles California's thermal expansion exceptionally well.
Premium ethylene propylene diene monomer (EPDM) rubber membrane — highly resistant to ozone, UV, and extreme temperatures. The go-to solution for large commercial flat roof surfaces.
Extend the life of an existing commercial roof by 10–15 years without a full tear-off — saving 40–60% vs. replacement. Silicone, acrylic, and polyurethane coatings restore waterproofing and reflectivity.
Standing seam and corrugated metal systems for commercial and industrial buildings — delivering a 40–70 year lifespan, fire resistance, and solar panel compatibility in a single low-maintenance package.
Precision edge termination and perimeter picture framing — the most leak-prone area of any flat roof, handled with exacting detail. Combined with TPO or modified bitumen for a watertight finish.
CSLB Lic. #1112937. Fully insured with $2M general liability and workers' comp — protecting your property and your business throughout every project.
We schedule commercial work around your business hours — evenings, weekends, phased sections — so operations never stop. No surprises, no delays.
TopCal handles every permit, inspection, and sign-off required by LA County. You never have to deal with the building department — we own the process start to finish.
As an Owens Corning Preferred Contractor, TopCal can issue manufacturer-backed system warranties — not just contractor warranties — giving building owners maximum protection.
Every commercial install is engineered to California's Title 24 energy code. We prepare roof decks and penetration details for solar panel integration — future-proofing your building.
Active leak on your commercial property? We provide same-day emergency response across all of LA County — stopping damage before it becomes a costly business interruption claim.
From the first call to the final walkthrough — every step is designed to make your roofing project easy and worry-free.
Our certified inspector arrives on-site, conducts a thorough assessment, and documents all findings with photos — completely free of charge.
We provide a detailed written estimate with transparent, itemized pricing — no hidden fees, no surprises. You choose the materials and timeline.
Our licensed crew handles all permits and completes the installation with precision — on time, on budget, and with zero compromise on quality.
We walk you through the completed project, confirm your total satisfaction, and provide all warranty documentation before we consider the job done.
Our AI-powered Virtual Assistant is available 24 hours a day, 7 days a week — schedule a free inspection, ask roofing questions, get estimates, and more. No wait times, no business hours.
Book at 2am or 2pm — our assistant handles scheduling around the clock.
From material selection to insurance claims — get expert answers immediately.
Storm damage or active leak? Our assistant will connect you to emergency crews instantly.
Check 0% APR financing eligibility in minutes — no impact to your credit score.
Speak with our Virtual Assistant
Call anytime to schedule your free inspection, get a roofing estimate, or ask any question — our assistant is always ready.
Call Now — It's Free💬 Average response time: under 30 seconds
Founded in Pasadena and rooted in the San Gabriel Valley, TopCal Roofing has grown to become Los Angeles County's most trusted roofing contractor — completing over 500 residential and commercial projects with a perfect 5-star reputation.
Our team of certified roofing professionals uses only manufacturer-approved installation techniques with the highest-grade materials from Owens Corning, Owens Corning, and Malarkey — ensuring every roof we install stands up to California's demanding climate for decades to come.
500+ five-star reviews across Google, Yelp, Angi, and BBB. These are real stories from real homeowners and business owners in Los Angeles County.
"TopCal replaced our roof in just 2 days — the crew was professional, clean, and the quality is outstanding. Best contractor experience I've ever had. Highly recommend to anyone in Pasadena!"
"After a major storm damaged our roof, TopCal came out the same day and handled everything — including our insurance claim from start to finish. Absolutely exceptional service."
"Professional from inspection to cleanup — the new roof looks absolutely amazing and the price was very fair. I'd give them 10 out of 10. Don't hesitate to call these guys."
"TopCal was incredibly professional throughout the entire process. My new tile roof looks stunning and I've already had neighbors ask who did the work. Couldn't be happier!"
"Our commercial warehouse needed a TPO re-roof on a very tight schedule. TopCal delivered on time and under budget — the quality is incredible and the crew kept our facility operational throughout."
"I called at 11pm about an emergency leak and someone picked up immediately. By 8am the next morning, the team was on my roof fixing the problem. This is what 5-star service really looks like."
Don't let budget concerns delay critical roof repairs or replacement. Our flexible financing options make it easy for every homeowner to get the roof they need today.
Qualified customers pay zero interest on approved roofing projects — keeping your monthly payments manageable.
Quick and easy application process — many customers receive approval in minutes with no impact to credit score to check eligibility.
Choose from 12, 24, 36, or 60-month payment plans tailored to your budget and the scope of your roofing project.
We handle storm damage insurance claims from start to finish — maximizing your payout and minimizing your out-of-pocket costs.
A new roof is one of the most important investments you'll make in your home. With our financing, you can protect your property today without straining your budget.
Call our 24/7 Virtual Assistant at (209) 720-3124
From Pasadena to Long Beach, from Santa Monica to Pomona — TopCal Roofing serves every community in Los Angeles County with the same award-winning quality and service.
Have a question? Our 24/7 Virtual Assistant at (209) 720-3124 can answer anything instantly. Here are the questions we hear most often.
Enter your address below — our AI measures your roof via satellite in seconds and gives you an accurate price estimate, no appointment needed.
Powered by Instant Roofer · Accurate within 1 square 98% of the time · All LA County ZIP codes covered
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Contact us by phone, online form, or call our 24/7 Virtual Assistant. We respond to all inquiries within 30 minutes during business hours and same-day on weekends.
530 S. Lake Ave, Pasadena, CA 91101
Mon–Fri: 7:00 AM – 6:00 PM
Saturday: 8:00 AM – 2:00 PM
Sunday: Closed (Emergency 24/7)
CSLB License #1112937
Owens Corning Preferred Contractor
Fully Licensed, Bonded & Insured
🏆 Named San Gabriel Valley's Top Roofing Company 2025
Owens Corning Preferred • Owens Corning Certified • Malarkey Authorized
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🔒 Your information is kept private. Or call us anytime at (209) 720-3124