Garage roof replacement cost
A two-car garage roof — 20 × 20 ft of footprint, about 460 sq ft of roof surface at a medium pitch — models at $4,500 – $10,300, or $9.89 – $22 per sq ft. Across the sizes below the whole range runs $3,600 – $13,500. That is a complete job: tear-off, disposal, underlayment, drip edge, the new covering, a permit allowance, cleanup and a final inspection, plus contractor overhead and contingency.
Modelled by the Renolume estimating model · engine 2.0.0, data v2026.1 · Last updated . Figures are priced against Salt Lake City, UT — the median of the 17 metros Renolume holds a measured wage sample for. Planning estimates, not contractor quotes.
Garage roof cost by garage size
Garages are sold by car count, roofed by square foot. This table does the conversion and then prices it.
| Garage | Footprint | Roof area | Modelled cost | Per sq ft | Elapsed |
|---|---|---|---|---|---|
| Single-car garage | 12 × 20 ft | 276 sq ft | $3,600 – $8,200 | $13 – $30 | 11 days |
| Two-car garage | 20 × 20 ft | 460 sq ft | $4,500 – $10,300 | $9.89 – $22 | 11 days |
| Oversized two-car garage | 24 × 24 ft | 662 sq ft | $5,600 – $12,600 | $8.50 – $19 | 11 days |
| Three-car garage | 30 × 22 ft | 759 sq ft | $6,100 – $13,500 | $7.97 – $18 | 12 days |
Roof area is the footprint multiplied by 1.15 for a medium pitch — the same conversion the planner uses. Watch the per-sq-ft column: it falls as the garage grows, because the permit, the dumpster, mobilising a crew and the final inspection cost much the same whatever the size. A garage roof is the job where fixed costs are most visible, and it is the reason a garage quote can look expensive per square foot while being entirely fair as a total.
Garage roof cost by material
The same 460 sq ft two-car garage roof, priced across the coverings the engine models.
| Material | Modelled cost | Per sq ft | Step up from base |
|---|---|---|---|
| 3-tab asphalt shingle | $4,200 – $9,700 | $9.19 – $21 | — |
| Architectural shingle | $4,500 – $10,300 | $9.89 – $22 | +$400 |
| Standing-seam metal | $6,100 – $15,700 | $13 – $34 | +$3,500 |
On a roof this small the step up between specifications is a few hundred dollars rather than a few thousand, which changes the decision. Matching the house roof is usually worth it on an attached garage — a mismatched shingle line is visible from the street and is one of the few roofing choices that shows up in a valuation conversation. On a detached garage at the back of a lot, the cheapest modelled option is a defensible answer.
Attached versus detached
The single question that changes the scope of a garage re-roof.
Attached garage
- The roof-to-wall junction has to be re-flashed into the house wall, not just capped.
- The tie-in usually means matching the house covering, so material choice narrows.
- It is part of the conditioned envelope, so a failure leaks into the house.
- Doing it at the same time as the house roof is materially cheaper than doing it separately.
Detached garage
- A simple gable or hip with no wall tie-in, and often the shortest job on this site.
- No interior protection required, which removes a cost line and a whole class of risk.
- Access decides the price more than area does — a garage behind a fence needs hand-carrying.
- The strongest partial-DIY case Renolume models, within the limits set out below.
Scope, timeline and the other cost lines
What sits in the modelled total besides labour and materials.
| Line | Modelled cost |
|---|---|
| Building permit | $200 – $900 |
| Temporary protection and landscape covering | $100 – $300 |
| Dumpster and haul-away | $400 – $900 |
Active work on the two-car garage is around 2.8 days; the model shows 11 days elapsed once delivery, a weather buffer and the inspection wait are counted. The engine marks site setup, tarps and landscape protection, magnet sweep, cleanup and haul as reasonable homeowner work and holds tear off existing roofing and replace damaged roof sheathing as contractor work — the covering because manufacturer warranties require certified installation, the tear-off because it is disposal handling at height. You should not need to speak contractor to know which half of your own job is which.
The same garage roof across metros
Identical garage, identical specification, priced against each metro's own wage sample.
| Metro | Modelled cost | Per sq ft |
|---|---|---|
| Houston, TX | $4,000 – $9,000 | $8.75 – $19 |
| Dallas, TX | $4,100 – $9,200 | $8.92 – $20 |
| Atlanta, GA | $4,100 – $9,200 | $8.91 – $20 |
| Charlotte, NC | $4,100 – $9,300 | $8.91 – $20 |
| Phoenix, AZ | $4,300 – $9,800 | $9.33 – $21 |
| Cleveland, OH | $4,400 – $9,900 | $9.57 – $21 |
| Detroit, MI | $4,500 – $10,100 | $9.77 – $22 |
| Salt Lake City, UT | $4,500 – $10,300 | $9.89 – $22 |
| Miami, FL | $4,500 – $10,600 | $9.78 – $23 |
| Philadelphia, PA | $4,600 – $10,700 | $10 – $23 |
| Denver, CO | $4,800 – $10,900 | $10 – $24 |
| Minneapolis, MN | $4,800 – $11,100 | $11 – $24 |
| Seattle, WA | $4,900 – $11,600 | $11 – $25 |
| Chicago, IL | $5,100 – $11,700 | $11 – $25 |
| San Francisco, CA | $5,400 – $12,900 | $12 – $28 |
| Boston, MA | $5,500 – $13,000 | $12 – $28 |
| New York, NY | $5,700 – $13,400 | $12 – $29 |
Houston models at $4,000 – $9,000 and New York at $5,700 – $13,400 for the same garage. On a job this size the gap is smaller in dollars than on a house roof, but proportionally it is the same story: wages, freight and permit fees, not the roof.
Garage roof versus house roof
How a garage roof compares with the house it usually stands beside.
A garage roof is the same trade sequence at a fifth of the scale, which is why it is a good first job to understand before you commission the big one. If the house roof is within a few years of replacement, ask for both priced together: the mobilisation, dumpster and permit lines are largely shared, and doing them as one job typically saves more than the material difference between specifications. The parent page, full roof replacement cost, models the house side of that comparison.
Assumptions, exclusions and confidence
The honest boundary of this page: what the model computes, and what it deliberately does not.
What is modelled
- A single-storey garage with one existing roofing layer, medium pitch and easy site access.
- Full tear-off, disposal, underlayment, drip edge, ridge, flashing, new covering, cleanup and inspection.
- A permit allowance scaled by the local permit fee index.
- A 10% sheathing replacement allowance, the same default the planner applies to an unknown deck.
What is not modelled
- Structural repair to garage framing, headers, or a sagging ridge.
- Rebuilding or re-siding fascia, soffit and gable ends beyond the roof edge.
- Garage conversions, dormers, or adding insulation and a ceiling below the roof.
- Carports, canopies and open structures, which are a different scope entirely.
Garage figures use the same task library and wage data as a house roof, held at a single storey with easy access. The reference run scores 85/100 — high confidence — because the property is generic rather than yours. Answering the planner's questions about your own roof is what moves that score. How the confidence score works · Methodology.
Related roof costs
Adjacent roof questions Renolume models today.
- Full roof replacement cost — the whole-job parent page for every roof scope.
- Roof replacement cost by size — Every common roof area from 800 to 3,000 sq ft, plus the footprint-to-roof-area conversion.
Questions homeowners ask
How much does it cost to replace a garage roof?
A two-car garage — 20 × 20 ft of footprint, about 460 sq ft of roof surface at a medium pitch — models at $4,500 – $10,300, or $9.89 – $22 per sq ft. A single-car garage models at $3,600 – $8,200 and a three-car at $6,100 – $13,500. Those are whole-job figures including tear-off, disposal, underlayment, drip edge, the new covering, a permit allowance and contractor overhead — not a materials list.
Is a garage roof cheaper per square foot than a house roof?
Per square foot it is usually dearer, not cheaper. The fixed costs of the job — mobilising a crew, the dumpster, the permit, the final inspection — do not shrink with the roof. On a 460 sq ft garage roof they are spread over a fifth of the area of a typical house roof, so the rate rises even though the total falls. Judge a garage quote on the total and the scope, never on a per-square-foot rate lifted from a house-roof article.
Do I need a permit to replace a garage roof?
A permit allowance of $200 – $900 is modelled into the figures above, scaled by the local permit fee index. Most jurisdictions treat a re-roof as permitted work whether the structure is attached or detached, and an attached garage is more likely to be inspected together with the house because the shared wall and the roof-to-wall flashing are part of the building envelope. Treat the allowance as a budget line and confirm the fee with your building department.
How long does a garage roof take?
Active work on a two-car garage roof is around 2.8 days, and the model shows 11 days elapsed once material delivery, weather buffer and the inspection wait are included. A single-day tear-off-and-replace is realistic for a crew of three in settled weather; what usually stretches the calendar is scheduling and inspection, not the roofing.
Can I roof a garage myself?
Parts of it, honestly. The engine marks site setup, tarps and landscape protection and magnet sweep, cleanup and haul as reasonable homeowner work. It marks the covering, underlayment and flashing as contractor work, because manufacturer warranties require certified installation and because tear-off is disposal-handling work at height. A detached single-car garage is the most defensible DIY case on this whole site — and it is still the one where a failed detail leaks onto your car rather than into your ceiling.
Does the roofing material matter on something this small?
Less than people expect. Across the modelled options the two-car garage spans $4,200 – $9,700 to $6,100 – $15,700. Because the area is small, stepping up specification costs less in absolute dollars than it would on a house — which is the argument for matching the house roof rather than defaulting to the cheapest shingle.
Why does the same garage roof cost different amounts in different cities?
The same scope models at $4,000 – $9,000 in Houston and $5,700 – $13,400 in New York. Nothing about the job changes — only the local wage sample, material freight and permit fees. Renolume prices 17 metros from measured wage data rather than applying a national average everywhere.
Get this priced for your actual house
Answer six questions and the range narrows to your property, your access, your existing conditions.
Planning estimate only. This is not a quote, bid or appraisal. Ranges reflect typical market conditions for the stated data version and do not account for site-specific concealed conditions, local code interpretation or contractor availability. Always obtain written bids. Data version v2026.1. Last updated . Methodology.