From single-story retail storefronts to large industrial complexes — TopCal installs, repairs, and maintains every commercial roofing system in Los Angeles County with zero business disruption and full manufacturer warranties.
We are certified installers of all major commercial flat and low-slope roofing systems — each backed by full manufacturer warranties and California Title 24 compliance.
Single-ply thermoplastic polyolefin — the #1 commercial flat roofing choice in California. Heat-welded seams create a fully monolithic, waterproof, ENERGY STAR® compliant layer that slashes cooling costs.
Heat-applied, multi-ply asphalt system engineered for flat and low-slope commercial roofs. Creates a seamless, high-tensile membrane that handles California's extreme thermal cycling.
Premium ethylene propylene diene monomer rubber membrane — highly resistant to ozone, UV, and extreme temperature swings. The go-to solution for large commercial flat roof surfaces with minimal maintenance needs.
Silicone and acrylic elastomeric coatings applied over existing roofs to seal leaks, reflect UV, and extend roof life by 10–15 years — at a fraction of a full replacement cost.
Standing seam and R-panel metal systems built to last decades — ideal for warehouses, industrial, and solar-ready applications. Unmatched strength-to-weight ratio and the lowest long-term cost of any commercial system.
Install a new roofing system directly over the existing one by framing the perimeter and drains — eliminating costly tear-off, reducing waste, and keeping your business open throughout the project.
Use this quick reference to compare systems. Our estimators will help identify the best fit for your building during the free site assessment.
| System | Lifespan | Energy Efficiency | Low Maintenance | Best For | Avg. Cost / Sq. |
|---|---|---|---|---|---|
| TPO Membrane Best Value | 15–25 yrs | Retail, Office, Flat Roofs | $380–$550 | ||
| Torch Down / Mod Bit | 15–20 yrs | Low-slope, older buildings | $350–$520 | ||
| EPDM Rubber | 20–30 yrs | Large warehouses, industrial | $350–$500 | ||
| Roof Coatings Best ROI | +10–15 yrs | Roof restoration over existing | $120–$250 | ||
| Metal (Standing Seam) | 40–70 yrs | Warehouse, industrial, solar | $850–$1,200 | ||
| Picture Frame Overlay | New system life | Retrofit, cost-saving re-roof | $280–$450 |
*Cost per roofing square (100 sq ft). Final pricing depends on roof access, current condition, and system selected. Get a free exact quote below.
Our commercial crews are experienced working across all property types in Los Angeles County — from small storefronts to large industrial campuses.
Strip malls, shopping centers, and standalone retail — minimal disruption to tenants and customers.
Multi-story and low-rise office complexes with flat and low-slope systems needing durable solutions.
Large-footprint flat roofing for distribution centers, manufacturing plants, and industrial facilities.
HIPAA-sensitive environments handled with care — minimal noise disruption, evening & weekend scheduling available.
Apartment complexes, condos, and HOA-managed properties with coordinated phased project management.
Churches, mosques, synagogues — respectful scheduling around services and community events.
Reliable subcontracting for general contractors — competitive trade pricing, NDA available, COI on file.
K-12 schools, universities, and government buildings — prevailing wage certified and bonded.
We've earned the trust of property managers, owners, and facilities directors across Los Angeles County by delivering projects on time, on budget, with zero headaches.
Our commercial crews are trained to work around your schedule — evenings, weekends, and phased project timelines available. Your tenants and customers will barely notice we're there.
California C-39 Roofing Contractor License #1112937 with $2M general liability and workers' comp. Certificate of Insurance issued within 24 hours. We're ready for any property manager's vendor requirements.
As an Owens Corning Preferred Contractor and Firestone-authorized installer, we issue full manufacturer warranties — not just workmanship warranties — so your asset is fully protected.
We pull all required building permits, schedule inspections, and deliver the signed-off permit card at project close. You don't lift a finger on paperwork.
Storm, hail, or wind damage? We work directly with your insurance adjuster, provide full scope documentation, and maximize your claim — at no additional cost to you.
Active roof leaks don't wait for business hours. Our emergency response team is on call 24/7 — including nights, weekends, and holidays — to protect your property immediately.
Simple, transparent, and designed around your schedule. From first contact to final inspection, here's exactly what to expect.
We visit your property, inspect the existing roof, photograph and document all areas of concern, and identify the best system for your building and budget — at no charge.
Within 24–48 hours you receive a fully itemized written proposal with material specs, warranty coverage, timeline, and payment terms. No vague estimates — everything in writing.
We coordinate the project schedule around your operations. Our crews arrive on time, set up proper safety perimeters, and execute the project with minimal disruption to your business.
Our project manager walks the roof with you on completion day. We deliver the final inspection report, permit card, and all warranty documentation — and we're reachable for any follow-up needs.
Real reviews from real commercial clients across Los Angeles County — from small retail centers to large warehouses.
"Our commercial warehouse needed a full 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 fully operational throughout the entire project."
"TopCal handled our entire 12-unit strip mall re-roof in just 4 days. Every tenant stayed open throughout the project. The project manager communicated daily and the final result is outstanding."
"As a property management company we've tried multiple roofing contractors. TopCal is the only one that pulls permits, meets deadlines, and actually answers the phone. They're our exclusive commercial roofing contractor now."
Fill out the form and one of our commercial project managers will contact you within 2 business hours to schedule a free on-site assessment and detailed proposal.
Free on-site assessment — no obligation, no pressure.
Thank you! A TopCal commercial project manager will contact you within 2 business hours to schedule your free on-site assessment.
Or call us now: (209) 720-3124Join 200+ commercial clients across Los Angeles County who trust TopCal for their roofing needs. Get a detailed proposal at no cost — we come to you.
Our commercial roofing crews are based in the San Gabriel Valley and service every commercial property across LA County.