Chicago Roof Replacement Cost (2026): Flat vs. Pitched

Angi’s Chicago cost data, updated in July 2026, puts most roof replacements in the city between $6,049 and $14,515, with an average of $10,185. Flat roofs, the kind found on two-flats and greystones, average $12,067 on Angi’s figures. Your own number depends on the roof’s size, how many old layers come off, the condition of the deck underneath and the material. On a flat roof, the city’s code also limits which materials you can use.

Flat roofs and pitched roofs are different jobs

The classic Chicago bungalow has a low-pitched hipped roof, sometimes gabled, according to the Chicago Bungalow Association. A pitched roof like this can take asphalt shingles, and it falls under lighter permit rules.

A two-flat, in the association’s description, is a stacked bungalow “minus the hipped or gabled roof,” often finished with a parapet wall. Without that pitched roof, two-flats and greystones are topped with a low-slope roof, which needs a membrane rather than shingles: modified bitumen, TPO (a single-ply sheet) or EPDM (a rubber sheet). Two- and three-flats make up more than a quarter of Chicago’s housing, according to the association.

What each material costs per square foot

Roof prices are quoted per square foot of roof surface, not of floor area. Roofers often price by the “square,” which is 100 square feet of roof.

Material	Angi, Chicago pages (July 2026)	Fixr, national (Jan. 2026)	Expected life (Fixr)
Modified bitumen	$4 to $8	$4 to $8	About 20 years
TPO	$4.50 to $10	$4 to $14	20 to 30 years
EPDM	$5 to $12	$4 to $13	Up to 30 years
Built-up (tar and gravel)	$5.75 to $10	$4 to $10	15 to 30 years
Asphalt shingles	$3 to $11	Not covered	Not covered

Angi’s material ranges appear on its Chicago pages but are not labeled as Chicago-only figures. For flat roofs specifically, Angi puts the all-in Chicago price at $10 to $20 per square foot. This Old House, drawing on RSMeans data and its own roofing survey in a June 2026 update, estimates asphalt shingles in Illinois at $4.70 per square foot and metal at $8.77, with a statewide average job of $6,525. The gap between these sources is wide, which is a good reason to treat any published average as a starting point and let three local bids set your real number.

Items that often appear as separate lines on a bid:

Item	Typical price	Source
Tearing off the old roof	$1 to $5 per sq. ft.	Fixr, Jan. 2026; Angi, July 2026
Replacing damaged sheathing (deck)	$2 to $7 per sq. ft.	Angi, July 2026
Structural engineer, if needed	$400 to $800	Angi, July 2026

Chicago’s cool roof rules

Chicago’s energy code sends roof reflectance requirements to Section 1515 of the Chicago Building Code, for houses as well as commercial buildings. On a low-sloped roof, the new covering must have an initial solar reflectance of at least 0.72, or at least 0.50 after three years installed. A roofer can show compliance with a Cool Roof Rating Council label, an Energy Star label or a reflectance test.

There are exceptions. A roof weighed down with at least 15 pounds per square foot of ballast across the whole surface needs only a three-year value of 0.30. So does the rest of the roof when more than half of it is planted. Walking surfaces of rooftop decks and solar panels are exempt.

Pitched roofs have a lower bar. Coverings on roofs steeper than low-slope must have an initial reflectance of at least 0.15, unless the roof is 5:12 or steeper or the building is historic. A low-pitched bungalow roof can fall under that rule, so ask your roofer for the shingle’s rated reflectance.

In practice, ask every roofer to name the exact membrane or shingle and its rating on the bid. If a flat-roof bid lists a product without a rating that reaches 0.72, and no ballast, ask how it will pass inspection.

Do you need a permit?

It depends on the slope. The Department of Buildings does not require a building permit to repair, recover or replace the roof of a residential building up to four stories, or its garage, when the roof pitch is at least 2:12. Repairs covering up to 25% of any roof’s area also need no permit. Neither exception applies to Chicago Landmarks or buildings in landmark districts, and all work still has to meet the city’s construction codes.

Low-slope roofs need a permit. The Express Permit Program covers a replacement with no structural work and a recover over one existing layer. Going over two or more existing layers, or repairing the roof structure, requires drawings or calculations from an Illinois-licensed architect or structural engineer. The job also has to meet the insulation minimums in the Chicago Energy Transformation Code, so ask each roofer whether the price includes the insulation the code requires.

For a permitted job, the city requires that whoever does the roofing hold a valid Illinois roofing contractor license, and that the general contractor hold a Chicago general contractor license, Class A through E depending on project value. An owner can act as the general contractor by filing Form 401 with ID showing they live at the address. Permit fees are set in Section 14A-12-1204.2 of the Chicago Construction Codes administrative provisions.

When to schedule the work

Shingles can go on in cold weather, but it is harder. GAF, a major shingle maker, says there is no practical lower temperature limit for its fiberglass asphalt shingles, though it recommends temperatures above 40°F for the easiest handling. In the cold, shingles can turn brittle and crack, and the adhesive strips may not seal on their own, so crews have to hand-seal them. GAF recommends storing shingles in a heated space above 70°F for at least 24 hours before installing them in cold weather.

For a membrane roof, ask the roofer what minimum temperature the manufacturer allows for the adhesives in your system. The Illinois Department of Financial and Professional Regulation also advises choosing a roofer before storm season and being wary of door-to-door repair offers.

Check the license and compare bids line by line

Every roofing contractor in Illinois needs a state license from IDFPR, and so does every subcontractor doing roofing work. A limited license covers residential properties and condo buildings of up to eight units; an unlimited license adds commercial and industrial work. License numbers start with 104 and must appear on contracts, bids and permit applications. Verify a number at idfpr.illinois.gov or by calling 1-800-560-6420.

To compare bids fairly, make sure each one prices the same job:

• Tear-off or recover, and how many existing layers come off.
• A per-square-foot price for any deck sheathing replaced, so damage found under the old roof does not turn into an open-ended charge.
• The exact product, its warranty and its cool roof rating.
• Insulation added to meet the energy code on a flat roof.
• Who pulls the permit, if one is needed.

IDFPR’s consumer guide adds a few rules. Never sign a contract with blank spaces. Get a completion date, or a clause that cancels the contract and refunds your deposit if the work is not done by then. For contracts over $1,000, the roofer must give you the “Home Repair: Know Your Consumer Rights” pamphlet. Pay by check made out to the company, never in cash, and do not pay in full until the work is complete. Collect signed lien waivers from the roofing supplier and any subcontractors; a waiver signed only by the roofer does not protect you. Read whether the warranty covers installation or only the shingles, and look for exclusions such as winds over 45 mph.

After a hailstorm or windstorm that damages more than one home, IDFPR’s guide says you can cancel a roofing contract within five business days if your insurer denies all or part of the claim. The roofer may not represent you on the claim or file it with your insurer.

When you are ready to call roofers, check each company’s Illinois roofing license first with our guide on how to check a contractor’s license in Chicago. Our Chicago roofer ranking is not published yet; our methodology explains how it will be calculated.