How much does it cost to replace a garage roof?

Replacing a garage roof typically costs $1,500 to $4,000 for a one-car garage, $2,400 to $6,000 for a two-car garage and $3,200 to $8,000 for a three-car garage, according to HomeGuide, which puts the installed price at $4 to $12 a square foot. Your own price depends on how much roof the garage really has, which is more than its floor once you add the overhangs and the pitch, on the material, and on whether the job is done on its own or together with the house.

Two published estimates by garage size

HomeGuide publishes garage roof prices on two pages, and they differ. The newer page gives one range per garage size. The older one names the roof size it assumed and splits asphalt shingles from metal.

Garage	HomeGuide garage roof page, January 31, 2026	HomeGuide roof replacement page, November 7, 2025: asphalt shingles	Same page: metal
One-car	$1,500 to $4,000	$1,000 to $1,700 (280 sq ft)	$1,400 to $3,600 (280 sq ft)
Two-car	$2,400 to $6,000	$1,200 to $2,400 (400 sq ft)	$2,000 to $5,200 (400 sq ft)
Three-car	$3,200 to $8,000	$2,500 to $5,000 (840 sq ft)	$4,200 to $10,900 (840 sq ft)

Both pages come from the same company, and neither is wrong: the ranges overlap, and the gap between them is mostly how much roof and which material each one assumes. HomeGuide says labor is 40% to 60% of the cost of a garage roof replacement. The next section shows why the size assumption matters so much.

How much roof does your garage have?

HomeGuide's garage building guide gives the usual floor sizes: a one-car garage is typically 12 to 16 feet wide and a two-car garage 20 to 24 feet wide, both 20 to 24 feet deep; a three-car garage is typically 30 to 36 feet wide and 20 to 24 feet deep.

The roof is bigger than the floor. Use the method from our roof replacement cost guide: measure the footprint including the overhangs, multiply it by the pitch factor, and divide by 100 to get squares. For a 6 in 12 pitch the factor is 1.118; for a 4 in 12 pitch it is 1.054, and that guide lists the rest.

The examples below are our own arithmetic, not published prices. They assume a simple gable roof whose eaves overhang 1 foot on every side, at a 6 in 12 pitch.

Garage floor	Footprint with 1 foot overhangs	Roof area at 6 in 12	Squares
One-car, 12 by 20 feet	14 × 22 = 308 sq ft	308 × 1.118 = about 344 sq ft	about 3.4
Two-car, 24 by 24 feet	26 × 26 = 676 sq ft	676 × 1.118 = about 756 sq ft	about 7.6
Three-car, 36 by 24 feet	38 × 26 = 988 sq ft	988 × 1.118 = about 1,105 sq ft	about 11.0

A roomy two-car garage can carry almost twice the 400 square feet that HomeGuide's older table assumes, which is why a price per square foot, or per square, is a better guide than a price per garage. Measure yours, or let the roof cost calculator do the arithmetic.

Cost by material

These are HomeGuide's installed prices per square foot for a garage roof, labor and materials included, with the totals for our three example roofs worked out from them.

Material	HomeGuide, per sq ft installed	One-car, 344 sq ft (ours)	Two-car, 756 sq ft (ours)	Three-car, 1,105 sq ft (ours)
Asphalt shingles	$4 to $9	$1,376 to $3,096	$3,024 to $6,804	$4,420 to $9,945
Metal, standing seam	$9 to $16	$3,096 to $5,504	$6,804 to $12,096	$9,945 to $17,680

Asphalt shingles are the lowest-cost pitched option in HomeGuide's table. For the difference between shingle grades, see architectural vs 3-tab shingles.
Metal costs more per square foot. HomeGuide's garage figure is for standing seam; exposed-fastener panels usually cost less, and our metal roof cost guide compares the panel types and metals.
Tile and wood shake are on HomeGuide's list too, at $10 to $25 for tile and $25 to $30 for real cedar shake, and are mainly worth pricing where the garage has to match a tile or shake house.

Low-slope and flat garage roofs

Some garages have a flat or nearly flat roof. Shingles cannot go on it: the Asphalt Roofing Manufacturers Association (ARMA) says never to apply asphalt shingles on a roof with less than 2 inches of rise per foot (2:12), and requires extra underlayment between 2:12 and 4:12.

A flat garage roof takes a membrane. HomeGuide prices rubber (EPDM) at $4 to $14 a square foot installed for a garage. On a flat two-car roof of 676 square feet, the footprint above with no pitch factor, that comes to $2,704 to $9,464 by our arithmetic. HomeGuide's roll roofing page, from April 2023, puts rolled asphalt roofing at $2.00 to $5.50 a square foot installed, but says felt and mineral-surfaced rolls last only 5 to 10 years, against 10 to 25 years for modified bitumen, rubber and TPO. Our guides to flat roof replacement cost and TPO vs EPDM cover the membranes, drainage and ponding.

Small roofs and minimum charges

A garage roof is small, but some costs are not. The crew still has to travel, set up ladders and safety gear, bring a dumpster or trailer, and clean up. Housecall Pro's pricing guide for roofing contractors, posted February 12, 2026, says many roofing companies charge minimum fees for that reason, to cover setup time, safety equipment, travel and basic labor. HomeGuide reports that most roofers have a $150 to $300 minimum call-out fee for repairs; we found no published national figure for a minimum charge on a full garage roof replacement.

You can see the effect in HomeGuide's own table. Dividing its asphalt shingle prices by the roof size it assumed gives a low end of about $3.57 a square foot for the 280 square foot one-car roof ($1,000 ÷ 280), against $3.00 for the two-car roof ($1,200 ÷ 400) and $2.98 for the three-car roof ($2,500 ÷ 840). That is our arithmetic. The smallest roofs have the highest floor, so an estimate for a one-car garage that looks expensive per square foot may simply reflect the fixed cost of showing up.

If an estimate seems high for the size of the roof, ask whether it includes a minimum charge, and what the price would be if the garage were done on the same visit as other work.

The deck under the old roof

HomeGuide says rotted or water-damaged decking must be repaired or replaced before the new roof goes on, and puts the cost at $2 to $5 a square foot. On a garage the decking can be a large share of a small bill: replacing the whole deck on our 756 square foot two-car example would come to $1,512 to $3,780 at that rate, by our arithmetic, on top of the roofing.

Where only part of the deck is damaged, only those sheets need replacing. Ask for a price per sheet in writing, so a surprise at tear-off has a known cost. Our guide to roof decking and underlayment explains how the deck is judged and what a sheet should cost.

Some estimates offer to put new shingles over the old ones to save tear-off. HomeGuide notes that some codes allow one extra layer, but that it adds weight and hides deck problems. Our guide to roofing over existing shingles covers the rules.

Attached, detached, and doing it with the house roof

An attached garage often shares the house's roof, either as one continuous set of roof planes or as a lower roof tied into the house wall. If yours does, ask whether the house estimate already includes the garage, and check that its area is counted in the squares.

A detached garage is its own small job, with its own setup and cleanup, which is where minimum charges bite.

Doing the garage and the house on the same visit can help in two ways:

One setup. The crew, the dumpster and the delivery are already there, so the fixed costs described above are paid once, not twice. Ask each roofer to price the garage as a separate line on the house estimate, and on its own, so you can see the difference.
Matching color. IKO, a shingle maker, says shingles made on different days can have slightly different coloring, that bundles with different blend codes should not be mixed on the same roof, and advises checking the production codes on the bundles. Ordering both roofs together gives the best chance of a match, which matters most where the garage roof sits beside the house roof.

If the house roof still has years of life left and the garage roof is failing, there is no need to wait. Price the garage now, and ask what it would cost to do it in the same material when the house is replaced later.

Permits and insurance

HomeGuide says many places require a permit for a roof replacement even on a detached garage, and puts the fee at $50 to $500. The roofer should apply for it and include the fee in the estimate. Our guide to whether you need a permit to replace a roof explains who pulls it and what gets inspected.

On insurance, HomeGuide notes that a garage roof is usually covered only when the damage came from a covered peril such as wind, hail or a falling tree, not from wear. The Insurance Information Institute says most homeowners policies cover detached structures such as a garage, generally for about 10% of the insurance on the house itself. Your own policy decides what applies; this is not insurance advice, and our guide to roof insurance claims covers the process.

What to ask before you sign

The roof area in square feet or squares, and how the roofer measured it, including the overhangs and pitch.
The material by product line, and for a low-slope roof, which membrane and how it will drain.
Whether every old layer comes off, and a price per sheet for any decking replaced.
Whether the price includes a minimum charge, and what the garage would cost if done with the house roof.
Underlayment, drip edge, flashing where the roof meets a wall, and any vents, each named.
Who pulls the permit, the start date, and the warranties on materials and labor, in writing.

Our list of questions to ask a roofer has more, and before you hire anyone, see what to check before you hire a contractor.

Frequently asked questions

How much does it cost to reroof a two-car garage?

HomeGuide gives $2,400 to $6,000 on its garage roof page, and $1,200 to $2,400 for asphalt shingles or $2,000 to $5,200 for metal on a 400 square foot roof on its roof replacement page. A larger two-car garage with a steeper roof can have far more than 400 square feet of roof, so measure it and compare estimates per square foot.

Can I put shingles on a flat garage roof?

No. ARMA says asphalt shingles should never go on a roof flatter than 2 inches of rise per foot. A flat or very low-slope garage roof needs a membrane such as EPDM or TPO, or another covering rated for low slopes.

Is it cheaper to do the garage roof with the house roof?

Usually, because the crew, dumpster and delivery are paid for once. We found no published national figure for the saving, so ask the roofer to price the garage both ways.

How long does a garage roof replacement take?

HomeGuide says most take 1 to 3 days, and a simple one-car garage roof can often be finished in one day. Deck repairs and weather can extend it.

Do I need a permit to reroof a detached garage?

Often, yes. HomeGuide says many places require one even for a detached garage, at $50 to $500. Check your local building department's rules, or ask your roofer.

How we got these numbers

HomeAnvil does not yet publish price data of its own. Every figure on this page comes from a published source, read on September 27, 2026:

HomeGuide, garage roof replacement cost, January 31, 2026: cost by garage size, per square foot and by material, labor share, decking, permits, insurance, roof-overs and how long the job takes. HomeGuide says it tracks the estimates homeowners get from contractors.
HomeGuide, roof replacement cost, November 7, 2025: garage roof costs for asphalt shingles and metal with the roof size assumed for each garage.
HomeGuide, cost to build a garage, January 15, 2026: typical one-car, two-car and three-car garage dimensions.
HomeGuide, roof repair cost, February 9, 2026: the minimum call-out fee for repairs.
HomeGuide, roll roofing cost, April 5, 2023: rolled roofing prices and lifespans.
Housecall Pro, roofing prices and what to charge, February 12, 2026: why roofing contractors set minimum charges.
Asphalt Roofing Manufacturers Association, installing asphalt shingles on lower sloped roofs, July 14, 2025: the 2:12 minimum slope for shingles.
IKO, shingle color variation, information bulletin R-31, revised April 2015: color differences between production runs and blend codes.
Insurance Information Institute, what is covered by standard homeowners insurance: coverage for detached structures.
The roof areas, pitch factors and totals for our example garages are our own arithmetic, using the pitch-factor method from our roof replacement cost guide. They are illustrations, not published prices.