Replacing a garage roof with asphalt shingles typically costs $1,200–$3,000 for a one-car garage and $1,800–$4,500 for a two-car garage. Metal on a two-car garage runs $3,500–$8,000. A 10 × 12 ft shed roof comes to roughly $320–$800 with roll roofing or $640–$960 with three-tab shingles.
Below: prices per square foot by material, two worked garage examples, flat garage roofs, decking and permits, and how to price and count materials for a shed.
Installed prices, not a quote. Sources are listed at the end.
Price per square foot by material
| Material | Per ft² of roof, installed |
|---|---|
| Roll roofing (low slope) | $2–$5 |
| Three-tab asphalt shingles | $4–$6 |
| Architectural shingles | $5–$8 |
| EPDM rubber membrane (flat) | $3–$10 |
| TPO membrane (flat) | $4–$8 |
| Metal roofing | $12–$20 |
The low end for architectural shingles is higher here than on a house roof, where it starts near $3.80 per ft². On a small roof the fixed costs of the trip, setup and disposal are spread over fewer squares. The house-roof comparison is in roof replacement cost.
Two worked garage examples
Roof area is what gets priced, and it is larger than the garage floor: add the overhang, then multiply by the pitch factor (1.118 at 6/12). The roof pitch multiplier chart lists other pitches.
| Garage | Roof area | Three-tab | Architectural | Metal |
|---|---|---|---|---|
| One-car, 12 × 22 ft, 1 ft overhang, 6/12 | about 376 ft² (3.8 squares) | $1,503–$2,254 | $1,878–$3,005 | $4,508–$7,513 |
| Two-car, 24 × 24 ft, 1 ft overhang, 6/12 | about 756 ft² (7.6 squares) | $3,023–$4,535 | $3,779–$6,046 | $9,069–$15,116 |
The one-car example sits inside the published one-car range. The two-car example lands above the published two-car range for shingles, because this garage has a 6/12 pitch and overhang on every side; published ranges fit smaller or lower roofs. Pricing by measured roof area gives the number for one garage.
Attached and detached garages
A detached garage roof is its own job and is priced as above.
An attached garage roof usually shares its shingles, underlayment and flashing with the house. Where it meets the house wall, flashing ties the two together, and replacing only the garage section can leave a visible color change against older house shingles. Many owners replace an attached garage roof together with the house roof for that reason.
Flat garage roofs
Garages are the most common place for a flat or very low-slope roof. Membranes are the standard covering there: EPDM at $3–$10 per ft² and TPO at $4–$8 in the garage figures above. Shingles need a minimum slope; minimum roof pitch for asphalt shingles gives it. Larger flat roofs and the full membrane comparison are in flat roof replacement cost.
Decking, permits and timing
- Decking: about $2–$5 per ft² where it has to be replaced. That matches $75–$150 per 4 × 8 sheet, the rate used on this site, since a sheet covers 32 ft². Roof decking replacement cost covers the contract wording.
- Hidden rot found after tear-off: typically adds $300–$1,200 on a garage.
- Permits: $50–$500, depending on the city or county.
- Time: one to three days for most garages.
Shed roofs
A 10 × 12 ft shed with a 6-inch overhang and a 6/12 pitch has about 160 ft² of roof, or 1.6 squares:
| Covering | Per ft² | 10 × 12 shed |
|---|---|---|
| Roll roofing | $2–$5 | $320–$800 |
| Three-tab shingles | $4–$6 | $640–$960 |
| Architectural shingles | $5–$8 | $800–$1,280 |
Materials for doing it yourself: at 3 bundles per square plus 10% waste, 1.6 squares needs 6 bundles of architectural shingles, before starter strip and ridge cap. The count for other sizes is in how many bundles of shingles per square, and nails in how many roofing nails per square.
A shed roof is also a common place for three-tab shingles: the cost per year advantage of architectural shingles matters less on a building that is not the house. See asphalt shingle roof replacement cost.
The short version
- Asphalt shingles: one-car garage $1,200–$3,000, two-car $1,800–$4,500; metal on two-car $3,500–$8,000.
- Per ft²: roll $2–$5, three-tab $4–$6, architectural $5–$8, metal $12–$20.
- Price by roof area: footprint plus overhang, times the pitch factor.
- Add decking at $2–$5 per ft² where needed, and a $50–$500 permit.
- A 10 × 12 shed: about 160 ft² of roof, 6 bundles, $320–$1,280 installed depending on covering.
Where these numbers come from
- Garage ranges by size and material, per-ft² prices, decking, hidden rot, permits and timing: Block Renovation, garage roof replacement costs, updated July 26, 2026.
- Pitch factor, roof areas, example totals and bundle counts: calculated from the dimensions shown, √(1 + (rise ÷ 12)²), and 3 bundles per square with 10% waste.
- House-roof and decking comparison: the price basis used across this site; see roof replacement cost.