★★★★★
“Prompt, very informative, and honest. Bill inspected my roof. No leaks. End of story. They had certified my roof a year prior. I am very satisfied with the level of service.”
EG
Eddie Gomez
Commercial Roofing
Commercial roofing from a licensed and liability insured contractor. We install, repair, and maintain flat and low-slope roofing systems for commercial buildings, working around your operations to keep your business running with minimal tenant disruption. Roofing since 1987, with written proposals and no advance deposit.
1987
Roofing since
14
Insurance carriers
TPO
Flat-roof systems
What Is Commercial Roofing?
Commercial roofing covers the roofs on commercial buildings: offices, retail centers, warehouses, apartment complexes, and institutional facilities. Most commercial roofs are flat or low-slope and cover far more square footage than a home, so they use membrane and built-up systems rather than shingles, and the priorities shift toward business continuity, drainage, and long-term cost of ownership. Here is how commercial roofing compares to residential.
Commercial
Flat and low-slope, at building scale
- Flat and low-slope systems: TPO, EPDM, modified bitumen, built-up, metal, and coatings
- Large square footage measured and priced by system and area
- Ponding, drainage, and rooftop equipment are central design concerns
- Work is scheduled around operations to minimize tenant disruption
- Owners weigh capital replacement against ongoing maintenance and repair
Residential
Steep-slope, at home scale
- Mostly steep-slope pitched roofs using shingles, tile, or shake
- Smaller roof areas priced by roofing squares
- The homeowner is usually the single decision-maker
- Curb appeal and neighborhood or HOA standards drive material choices
- See our residential roofing hub for the homeowner buying journey
Commercial Roofing Systems
Every commercial building is different, so we install and service the full range of flat and low-slope systems. Here are the six systems we work with most, and when each one tends to be the right fit.
TPO (Single-Ply Membrane)
A white, heat-welded thermoplastic membrane that reflects sunlight and resists ponding. A strong default for offices, retail, and warehouses that want energy efficiency and a clean, watertight roof at a moderate cost.
EPDM (Rubber Membrane)
A durable single-ply rubber membrane known for long service life and flexibility in temperature swings. A good fit for large low-slope roofs where proven longevity matters more than a reflective surface.
Modified Bitumen
Asphalt-based sheets reinforced with polymer and applied in layers with granulated cap sheets. A rugged, walkable surface that suits roofs with heavy foot traffic or frequent rooftop service access.
Built-Up Roofing (BUR)
The traditional layered felt-and-asphalt system finished with gravel ballast. Redundant, time-tested waterproofing that fits large flat roofs and buildings that want a heavy, protective assembly.
Metal Roofing
Standing-seam and metal panel systems for low-slope and transitional roofs. Long-lived and low-maintenance, a fit for buildings that want durability and a defined architectural look.
Roof Coatings
Reflective elastomeric coatings that restore and extend an aging but sound membrane. A cost-effective way to add watertight years and reduce cooling load without a full tear-off, when the existing roof qualifies.
Property Types We Serve
We work with commercial property owners and facility managers across a wide range of building types, each with its own roofing priorities and scheduling needs.
Office & Professional
Office parks and professional buildings where a watertight, energy-efficient roof protects tenants, equipment, and interiors with minimal interruption to the workday.
Retail & Shopping Centers
Strip malls and shopping centers with long rooflines and multiple tenants, where we phase work to keep storefronts open and customers moving.
Industrial & Warehouse
Warehouses and distribution facilities with expansive flat roofs, where large-scale membrane systems and reliable drainage protect inventory and operations.
Multifamily & Apartments
Apartment complexes and multifamily buildings where we coordinate with property management to protect residents and limit disruption across occupied units.
Medical & Institutional
Medical offices, schools, and institutional facilities that require careful scheduling, clean work areas, and dependable roofing over sensitive operations.
Commercial Roofing Services
Whatever your building needs, from a single repair to a full re-roof, these are the services we perform on commercial roofs, each with its own detailed page.
Commercial Roof Repair
Leak repair, seam and flashing work, and storm damage on flat and low-slope roofs.
Commercial Roof Replacement
Full re-roof and system replacement when a commercial roof reaches the end of its life.
Commercial Roof Inspections
Documented condition assessment and moisture survey with a written report.
Roof Coatings & Restoration
Reflective coatings that restore and extend an aging but sound membrane roof.
TPO & Flat-Roof Systems
Our flat and low-slope material hub covering TPO membrane installation and service.
Residential Roofing
Serving a home instead? Visit our residential roofing hub for homeowners.
New Construction & Re-Roofing
Building new or planning a full re-roof? We install complete commercial roofing systems from the deck up, including insulation, cover board, and membrane, spec'd to your building and coordinated with your project schedule. For a capital re-roof, we provide a written proposal and a clear scope.
Roof Replacement
Commercial Maintenance & Repair
A flat roof lasts longest with regular attention. We offer maintenance programs and responsive repairs that keep seams sealed, drains clear, and small problems from becoming major ones, protecting your building and deferring the larger capital expense of a full replacement.
Roof RepairHow Much Does a Commercial Roof Cost?
Commercial roofing is typically priced per square foot and varies by the system, the roof size, the amount of tear-off and insulation, roof access, and rooftop penetrations and equipment. A useful rule of thumb: the 25% rule says that if more than 25% of a roof is damaged or already carries two roofing layers, a full replacement is usually the better value than another repair or overlay.
Roof Coatings & Restoration
$6-$8 / sq ft
A reflective coating over an aging but sound membrane, the lowest-cost option when the existing roof qualifies.
Single-Ply Membrane (TPO / EPDM)
$8-$20 / sq ft
A new single-ply membrane system with insulation, priced by roof size, tear-off, and detailing.
Built-Up / Modified Bitumen / Metal
$3-$8 / sq ft
Layered or metal systems for buildings that want heavier, longer-life assemblies, priced by system and complexity.
Our Commercial Roofing Process
A clear, low-pressure process built around keeping your building operating. We respond promptly and schedule assessments within 1 to 2 business days.
1
Assessment & Moisture Survey
A commercial specialist assesses the roof, checks for ponding and moisture in the assembly, and measures the area so we understand the true condition before recommending anything.
2
System & Spec Recommendation
We recommend the right system for your building, whether a coating, a single-ply membrane, or a full replacement, and explain the trade-offs in cost, life span, and performance.
3
Written Proposal & Scheduling
You receive a written proposal with a clear scope and timeline. We plan the work around your operations and tenant schedules to minimize disruption.
4
Installation With Minimal Disruption
Trained crews install to manufacturer specification with staged work areas, contained debris, and clear access, keeping your business running throughout.
5
Warranty & Maintenance Plan
We complete a final walkthrough, register your workmanship and manufacturer system warranties, and set up an optional maintenance plan to protect the investment.
Financing Available
Financing is available on qualifying commercial roofing projects through our lending partners, which can help spread the cost of a capital re-roof. Ask your commercial specialist about current options.
Warranty Protection
Every Roof Doctors commercial roof is backed by layered warranty coverage, including the manufacturer's system warranty on qualifying installations.
Manufacturer System Warranty
Membrane / system coverage on qualifying installations
New membrane and system installations qualify for the manufacturer's system warranty when installed to specification, covering the roofing materials for the covered term.
1 Year
Workmanship Warranty
Labor and materials on every project
Covers the quality of our installation and workmanship on all completed commercial roofing work.
2 Years
Roof Leak Certification
Optional purchasable certification
A purchasable 2-year certification. A service fee applies per reported leak, and any covered repair is completed at no additional charge.
Optional add-on. Not available on full roof replacements.
Storm Response and Insurance Claims
We Handle Your Insurance Claim
Wind, hail, and storms can damage a commercial roof and interrupt your business, and that damage may be covered by your commercial property policy. Roof Doctors documents the damage, works directly with your adjuster, and processes claims within the Xactimate and Symbility estimating platforms.
Areas We Serve
Roof Doctors serves commercial properties across California. Find your area or view the full directory.
What Our Customers Say
★★★★★
4.7 out of 5 across Roof Doctors' Google Business Profiles
★★★★★
“Showed up quickly during a storm, figured out problem, provided a solution.”
AL
April L.
★★★★★
“Troy was informative and professional. Would recommend to other home owners.”
MG
Ms. Gibson
Commercial Roofing: Frequently Asked Questions
What is commercial roofing?
Commercial roofing is the installation, repair, and maintenance of roofs on commercial buildings such as offices, retail centers, warehouses, apartment complexes, and institutional facilities. Most commercial roofs are flat or low-slope and use membrane or built-up systems like TPO, EPDM, modified bitumen, and built-up roofing rather than the shingles common on homes.
What is the average cost of a commercial roof?
Commercial roofing is typically priced per square foot and varies widely by system, roof size, tear-off, insulation, and access. A reflective coating over a sound roof sits at the lower end, a new single-ply membrane in the middle, and heavier built-up or metal systems at the higher end. Every roof is priced from an on-site assessment and a written proposal, with no advance deposit.
What is the 25% rule for roofing?
The 25% rule is a guideline used to decide between repair and replacement. If more than 25% of a roof is damaged, or the roof already carries two layers, a full replacement is usually the better value than another repair or overlay. Building codes also often limit a roof to two total layers, which is why the rule points toward replacement past that threshold.
What is the difference between commercial and industrial roofing?
Both are flat or low-slope commercial-scale roofs, but industrial roofing usually covers larger, simpler buildings like warehouses and manufacturing plants with more roof area and heavier rooftop equipment, while commercial roofing more broadly includes offices, retail, and multifamily where tenant occupancy and appearance matter more. The systems overlap; the scale, access, and scheduling differ.
What warranty comes with a commercial roof?
Every project includes a 1-year workmanship warranty covering our installation. New membrane and system installations also qualify for the manufacturer's system warranty when installed to specification. An optional 2-year roof leak certification is available as an add-on on qualifying work.
Do you offer commercial roof maintenance contracts?
Yes. We offer maintenance programs that keep seams sealed, drains clear, and small issues from becoming major ones. Regular maintenance extends the life of a commercial roof and defers the larger capital expense of a full replacement, which is why many owners pair a new roof with an ongoing maintenance plan.
Do you require a deposit?
No. Roof Doctors does not require an advance deposit on commercial projects. You pay after the work is completed to your satisfaction.
Request a Commercial Roof Proposal
A commercial specialist will assess your roof, document its condition, and provide a written proposal. No obligation, no advance deposit.
Licensed and Liability InsuredFlat & Low-Slope SystemsNo DepositWritten Proposal