Commercial Roof Replacement Cost

Most commercial buildings have low-slope roofs covered by a membrane (TPO, EPDM or PVC), modified bitumen, built-up roofing, spray foam or metal. Owners usually replace when leaks multiply, insulation gets wet, or repair bills approach a meaningful share of replacement cost.

This guide gives 2026 per-square-foot prices by system, a sample budget for a 10,000 sq. ft. building and typical repair costs. Commercial pricing depends heavily on insulation code requirements, access and the condition of the deck, so treat these figures as budgeting ranges. For homes, see our flat roof replacement cost guide.

Average cost

Typical installed totals for commercial re-roofing, national ranges as of October 2026:

Commercial roof cost by system

Installed price per sq. ft. Membrane-only figures assume existing insulation stays; the second column includes new R-30 insulation and tear-off.

Cost breakdown: materials, labor, permits and extras

Line-item estimate for replacing the roof on a 10,000 sq. ft. low-slope building with 60-mil mechanically attached TPO, including tear-off and new polyiso insulation. Ranges are national, as of October 8, 2026.

Reusing dry insulation can remove most of the insulation line, which is why bids for the same building can differ by tens of thousands of dollars.

What affects the price

• Roof system (TPO, EPDM, PVC, built-up). Single-ply TPO and EPDM are generally the least expensive membranes at about $5–$10 per sq. ft., PVC costs slightly more, and multi-ply modified bitumen $6–$12. Metal runs $7–$14 but can last much longer.
• Area. Large roofs cost less per sq. ft. thanks to bulk materials and efficient crews; HomeGuide notes discounts often apply above about 20,000 sq. ft. A 2,500 sq. ft. roof typically costs $12,500–$35,000, a 10,000 sq. ft. roof $50,000–$140,000.
• Deck condition. Corroded steel deck or rotted wood deck must be replaced before the new system goes on, at roughly $2–$8 per sq. ft. where needed. A moisture survey before bidding shows how much deck and insulation is salvageable.
• Insulation. Energy codes often require added insulation on a full replacement. Installed polyiso costs about $1–$1.50 per sq. ft. per inch, and a full R-30 package roughly doubles the cost of a membrane-only job.
• Safety and permits. Cranes, edge protection, material hoisting and special permits add cost, particularly on taller buildings. Basic permits run about $100–$500, while strict codes in wildfire- or hurricane-prone areas can add thousands.

Ways to save

• Get at least three written bids from commercial roofing contractors, all based on the same specification: system, membrane thickness, attachment method, insulation R-value and warranty length.
• Commission an infrared or core-sample moisture survey first. Keeping dry insulation can save a large share of the insulation and tear-off budget.
• Ask whether a recover (new membrane over one existing roof) is allowed by code and the manufacturer; it skips about $1–$3 per sq. ft. in tear-off.
• Consider a coating or restoration system on a structurally sound roof with limited damage; spray foam and coatings can extend roof life for years at lower cost.
• Schedule work in the contractor's slower season and keep the roof on a maintenance plan; small repairs done early prevent wet insulation and deck damage.

Related questions people ask

How much does commercial roof repair cost?

Most low-slope roof repairs cost $300–$1,100, about $700 on average, with small patches from $150 and large repairs reaching $4,000+. Priced by area, repairs run about $2–$10 per sq. ft.; TPO repairs typically cost $600–$3,000. Large commercial buildings, emergency calls and roofs with wet insulation can cost considerably more, and repairs on roofs over 20 years old are often a stopgap.

How to get an accurate quote

Request at least three written bids from licensed, insured commercial roofing contractors. Provide each with the same information:

• Roof area, building height, deck type (steel, wood or concrete) and access for cranes and material storage.
• Results of a moisture survey and the number of existing roof layers.
• The system you want and required insulation R-value, plus any manufacturer warranty requirement (for example, 20-year NDL).
• Ask what's included: tear-off, disposal, insulation, flashing and edge metal, drains, permits, safety setup, and the warranty terms.

FAQ

How long does a commercial roof last?

TPO typically lasts 15–30 years, EPDM 15–25, PVC 20–30 and built-up roofs 20–30, depending on maintenance and drainage. Metal and well-maintained spray foam can last longer.

What is the cheapest commercial roof system?

Built-up roofing, spray foam and single-ply EPDM or TPO are usually the least expensive, at roughly $3.50–$10 per sq. ft. installed before new insulation.

How long does a commercial roof replacement take?

A small building can be re-roofed in a few days; a 10,000+ sq. ft. roof often takes one to several weeks, depending on tear-off, insulation work and weather.

For the big picture, start with our complete roof replacement cost guide.

Prices are estimates and vary by location and provider. See our methodology and editorial policy. Browse all exterior cost guides.