Commercial roof replacement in the Bay Area typically costs about $7–$16 per square foot in 2026, putting a 20,000 sq ft building at roughly $140,000–$320,000. Where you land in that range depends on the commercial roofing system, the insulation your building needs, how much of the deck needs repair, and how complex the roof is. This guide breaks down costs by system, building size, and scope; explains when a coating can replace a full reroof; and covers how to schedule a replacement without closing your business.
All prices below are estimates for budgeting. Verify them against a written bid for your building. Actual costs depend on roof condition, access, code requirements, and current labor and material rates.
Commercial Roof Replacement Cost in the Bay Area: Per Square Foot and Total
Most Bay Area commercial reroofs are priced per square foot of roof area and include tear-off, insulation, membrane, flashing, and disposal. Large roofs usually cost less per square foot than small ones, because mobilization, equipment, and crew costs spread across more area.
|
Roof size |
Estimated total cost |
|---|---|
|
10,000 sq ft |
$70,000 – $160,000 |
|
20,000 sq ft |
$140,000 – $320,000 |
| 50,000 sq ft |
$300,000 – $700,000 |
Here is where the money goes on a typical full replacement:
|
Cost component |
Estimated cost per sq ft |
|---|---|
|
Tear-off and disposal |
$1.00 – $3.00 |
|
Insulation (to current code) |
$1.50 – $4.00 |
|
Membrane and installation |
$3.50 – $6.50 |
|
Flashing, edge metal and drains |
$0.75 – $2.50 |
Permit fees are separate. They are set by your city or county and are often based on project value.
Need a number for your building? Request a free commercial roof inspection and get a written bid based on measured roof dimensions and your roof’s condition.
Commercial Roof Replacement Cost by System (TPO, PVC, EPDM and More)
|
System |
Installed cost per sq ft |
Typical lifespan |
Best for |
|---|---|---|---|
|
TPO (60-mil) |
$7 – $13 | 15–25 years |
Reflective, widely used, good fit for cool-roof requirements |
|
PVC |
$9 – $15 | 20–30 years |
Restaurants and buildings exposed to grease, oils or chemicals |
|
EPDM |
$6 – $12 | 20–30 years |
Durable rubber membrane; may need a white membrane or coating for cool-roof compliance |
|
Modified bitumen |
$8 – $14 | 15–25 years |
Heavy foot traffic and rooftop equipment |
|
Metal (standing seam) |
$12 – $25 | 40+ years |
Longest life; higher upfront cost |
|
Coating/restoration |
$2.50 – $6 | 10–15 years added |
Sound, dry roofs that don’t need full replacement |
TPO and PVC are both heat-welded, reflect sunlight, and cut cooling costs. PVC costs more and resists grease and chemicals better. The TPO vs. modified bitumen vs. roof coatings comparison covers how each flat roof system performs.
What Drives Commercial Roof Replacement Cost in the Bay Area
Roof size and complexity. Every HVAC unit, skylight, pipe, and drain needs to be flashed by hand. A simple open roof costs less than one crowded with equipment.
Insulation and energy code. California’s energy code sets insulation and, for many commercial roofs, cool-roof requirements. The specifics depend on your climate zone, roof slope, and how much of the roof is replaced. Your contractor should confirm compliance before bidding, because it changes the scope.
Number of layers to remove. Removing a single layer is standard. Multiple layers add labor and disposal weight.
Deck and insulation condition. Wet insulation and rotted deck found after tear-off add cost. This is the most common reason a final bill exceeds the bid, so request a pre-bid moisture and condition survey.
Building height and access. Tall buildings and tight urban sites may need cranes, material hoists, and traffic control, all of which add time and cost.
Drainage. Standing water is one of the biggest causes of flat roof leaks and early membrane failure. When you replace a roof, it’s the time to add tapered insulation or additional drains.
Labor. Bay Area roofing labor costs more than most of the state, and a fast, safe crew affects both price and schedule.
Roof Restoration vs. Replacement: When a Coating Is Enough
A coating can be the right call when the membrane is aging, but the insulation and deck are dry and sound. It typically costs a fraction of full replacement and adds roughly 10–15 years. It’s the wrong call when the insulation is wet, the membrane is failing at the seams across large areas, or the roof has already been coated several times.
The deciding factor is moisture. A moisture survey and core samples show what’s under the membrane. If you’re not sure, start with a professional roof inspection before you decide. Smaller problems may only need repair, and roof leak repair costs depend on the cause and roof type.
How to Replace a Commercial Roof Without Closing Your Business
Most commercial reroofs happen with the building occupied. A good plan covers:
- Phased work. Replace the roof in sections so the rest of the building stays watertight and in use.
- Tenant and staff notice. Tell occupants about noise, schedule, and any restricted areas before work starts.
- Protecting air intakes. Cover or relocate HVAC intakes when fumes or dust could enter the building.
- Site safety. Fence work zones, protect walkways and entry points, and provide fall protection that meets Cal/OSHA requirements.
- Weather plan. Tear off only what can be dried in each day. In the Bay Area, winter storms can interrupt long jobs.
- Debris and equipment staging. Agree on dumpster, crane, and material locations so parking and deliveries aren’t blocked.
Ask for the phasing plan in writing before you sign.
Commercial Roof Replacement Timeline and Permits in the Bay Area
|
Roof size |
Typical timeline (weather permitting) |
|---|---|
|
10,000 sq ft |
1–2 weeks |
|
20,000 sq ft |
2–4 weeks |
|
50,000 sq ft |
4–8 weeks |
A commercial reroof generally requires a permit from your city or county, along with inspections during the work. Fees and requirements vary by jurisdiction, so your contractor should pull the permit and schedule inspections. Build the permit and inspection timeline into your schedule, especially if you have a lease or tenant deadline.
Planning the budget? Replacement is a capital expense, so schedule bids and permits months ahead of the rainy season. Regular maintenance also extends a roof’s life, and a Bay Area roof maintenance checklist is a good place to start.
How to Get an Accurate Commercial Roof Replacement Quote
A lump-sum bid with no detail is hard to compare. Ask each contractor to state:
- Roof area and how it was measured. Drone or satellite measurement is more reliable than a rough estimate.
- System and thickness. For example, 60-mil TPO, the insulation type and R-value, and the fastening or adhesive method.
- Scope of tear-off. How many layers, and what happens if wet insulation or a rotted deck is found.
- Unit pricing for deck repairs. A per-sheet or per-square-foot price helps avoid later disputes.
- Permits and inspections. Who pulls them and who’s responsible for passing them.
- Phasing and safety plan. How the building stays operating and how workers are protected.
- Warranty. Equinox provides a 10-year workmanship warranty. Ask about the manufacturer warranty on the specific membrane you choose.
- License and insurance. Verify the CSLB license at cslb.ca.gov.
Our commercial roofing services cover replacement, repair, and inspection for commercial buildings.
FAQs
What does it cost to replace a commercial roof in the Bay Area per square foot? Most projects run about $7–$16 per square foot in 2026. TPO and EPDM are on the lower end, PVC and modified bitumen are in the middle, and metal is at the top. Coatings cost far less but only work on sound roofs.
How much does a 20,000 sq ft commercial roof replacement cost? Roughly $140,000–$320,000, depending on the system, insulation, deck repairs, and site access.
How long does a commercial roof replacement take? A 10,000 sq ft roof typically takes 1–2 weeks and a 20,000 sq ft roof 2–4 weeks. Larger roofs take longer, and winter weather can add delays.
Can my business stay open during a roof replacement? Usually yes. Most commercial reroofs are phased in sections so the building stays in use. Ask for a written phasing and safety plan before work begins.
Should I restore my commercial roof or replace it? A coating can work if the membrane is aging, but the insulation and deck are dry and sound. If moisture is trapped or seams have widespread failure, replacement is the better investment. A moisture survey settles it.
Do I need a permit to replace a commercial roof? Generally yes. Your city or county sets the permit fees and inspection requirements. Your contractor should pull the permit and schedule inspections.
Get a Written Commercial Roof Replacement Bid
Equinox Roofing Solutions has completed 1,000+ roofs, holds a 4.9★ rating on Google and Yelp, and offers 24/7 emergency service and a 10-year workmanship warranty. Schedule a free commercial roof inspection and get a detailed written bid for your building.