For a house, there is one national breakdown that almost every estimate starts from: the National Association of Home Builders survey of what a new home costs, split into 36 lines. For a garage there is nothing like it. NAHB folds the garage into the house, and its only garage-specific line is the door, which sits inside “windows and doors (including garage door)”.[7]
So to build our garage cost calculator we did it the long way. We collected the installed costs that the big US cost guides publish for each part of a garage, checked them on October 26, 2026, and wrote down where each one came from. We then turned them into a model that prices a garage from its own floor, wall and roof areas. This page explains that research: the totals the guides report, every line we price and its source, the building-code items that add cost, the state labor adjustment, and the places where the sources disagree.
Key takeaways
- Published two-car garage costs run from $15,000 to $60,000. HomeAdvisor’s average for any garage is $29,584.
- With our defaults, a stick-built 24×24 detached garage comes to $46,789 in construction, or about $56,600 with a 10% builder fee and 10% contingency.
- Framing is the biggest line, about 40% of a basic garage, because HomeGuide prices it per square foot of wall, trusses included.
- State construction wages range from 74% (Arkansas) to 129% (Hawaii) of the national mean, which moves a garage about 13% either way.
What the cost guides say a garage costs
Before building anything line by line, it helps to know what the guides report for whole garages. They don't agree, partly because each one has a different typical project in mind. HomeAdvisor's average is based on what its customers report paying, and includes small and simple garages. HomeGuide and Fixr describe a specific build, such as a 24 by 24 foot two-car garage with vinyl siding and an asphalt roof.
| Source | What it describes | Published cost |
|---|---|---|
| HomeAdvisor | Building any garage | $29,584 average; most $16,837 to $42,331 |
| HomeAdvisor | Two-car garage | $15,000 to $40,000 |
| HomeAdvisor | Detached garage | $26,400 average; most $19,200 to $33,600 |
| HomeGuide | Two-car garage | $25,000 to $60,000 |
| HomeGuide | Three-car garage | $30,000 to $80,000 |
| Fixr | Attached 24×24 two-car | $37,000 average; $23,000 to $45,000 |
| HomeGuide | Garage with apartment, 24×24 | $115,000 to $200,000 |
HomeAdvisor gives the costs per square foot as around $50 on average, from $30 for a basic attached garage up to $120 for a detached one.[1] HomeGuide puts a detached garage without living space at $50 to $100 per square foot.[5] Fixr prices conventional site-built attached garages at $60 to $80 per square foot and prefab ones at $40 to $60.[4] Those totals are a useful check, but they can't tell you what your own garage will cost, because they don't say how much of the price is the slab, the door or the wiring. That is what the line-by-line model is for.
What size garages Americans build
The calculator's presets follow what builders actually put on new homes. NAHB's analysis of the Census Bureau's Survey of Construction found that in 2024, 65% of newly completed single-family homes had a two-car garage, 15% had space for three or more cars and 9% had a one-car garage. Carports accounted for 1% and homes with no parking facility for 9%.[6]
The trend is toward smaller garages. Three-car garages peaked at 24% of new homes in 2015, while one-car garages reached their highest share in three decades. The mix also varies by region: three-car garages made up 33% of completions in the West North Central division but only 4% in New England.[6] That is why the calculator opens on a 24 by 24 foot two-car garage, with one-car, three-car, four-car and RV presets one click away.
Building a garage as part of a new house? Our guide to garage cost when building a house covers how garage size interacts with lot coverage and the front of the house.
How the calculator prices a garage
Most cost guides publish garage costs per unit: per square foot of slab, per square foot of wall, per door, per linear foot of gutter. A total only makes sense once you know how many units your garage has. So the calculator starts with geometry. From the width, depth and wall height you enter, it works out:
- Floor area, which prices the slab, the wiring, an epoxy coating and the ceiling.
- Wall area, the perimeter times the wall height plus the two triangular gable ends. An attached garage shares one side wall and one gable with the house, so those are left out.
- Roof area, the footprint plus a one-foot overhang on every side, adjusted for a 6-in-12 pitch, a common slope for garage roofs.
- Siding area, the wall area less the garage doors, entry doors and windows.
Each line is then priced at the midpoint of a published range. We use the midpoint because the guides give ranges rather than averages for most items, and the midpoint is the most neutral choice. The low and high totals the calculator shows use the bottom and top of every range, so you can see how much the same garage can vary before you have a single quote.
| 24×24 detached garage, 8 ft walls | Quantity |
|---|---|
| Floor area | 576 sq ft |
| Wall area including gables | 912 sq ft |
| Roof area at 6-in-12 pitch | 756 sq ft |
| Siding area after one double door, one entry door and two windows | 756 sq ft |
| Gutter length | 52 linear ft |
Every cost line and where it comes from
These are the published ranges behind each line, as installed costs, labor and materials together. Where a guide gives several figures, we picked the one that describes a new garage rather than a repair or a replacement.
| Line | Unit | Installed range | Source |
|---|---|---|---|
| Building permit | project | $150 to $1,500 | HomeGuide, HomeAdvisor |
| Site grading, level lot | sq ft of pad and apron | $0.40 to $1.00 | HomeGuide |
| Site grading, some slope | sq ft of pad and apron | $1 to $2 | HomeGuide |
| Clearing and excavation | 24×24 garage | $3,500 to $5,700 | Fixr |
| Slab, mild climate | sq ft of floor | $4 to $8 | HomeAdvisor |
| Slab, standard | sq ft of floor | $6 to $14 | HomeGuide |
| Slab with frost footings | sq ft of floor | up to $16 | Fixr |
| Framing with trusses and sheathing | sq ft of wall | $11 to $30 | HomeGuide |
| Asphalt shingle roof | sq ft of roof | $3 to $6 | Fixr |
| Vinyl siding | sq ft of wall | $3 to $12 | HomeAdvisor |
| Aluminum gutters | linear ft | $10 to $20 | HomeGuide |
| Garage door, single | door | $750 to $1,700 | HomeAdvisor |
| Garage door, double | door | $800 to $3,500 | HomeAdvisor |
| Opener, installed | opener | $218 to $540 | HomeAdvisor |
| Entry door | door | $300 to $1,000 | HomeGuide |
| Fire-rated door into the house | door | $600 to $2,000 | Fixr |
| Window | window | $450 to $1,500 | HomeGuide |
| Wiring, outlets and lights | sq ft of floor | $4 to $9 | HomeGuide |
| Underground power line | linear ft | $10 to $25 | HomeGuide |
| Subpanel | panel | $500 to $1,700 | HomeGuide |
| Level 2 EV charger installation | charger | $554 to $1,380 | HomeAdvisor |
| Plumbing fixture | fixture | $600 to $1,600 | HomeAdvisor |
| Single-zone mini-split | system | $2,500 to $6,000 | HomeGuide |
| Insulation | sq ft of wall and ceiling | $0.50 to $3.00 | HomeGuide |
| Drywall | sq ft of wall and ceiling | $1.50 to $3.50 | HomeGuide |
| Interior paint | sq ft | $1 to $3 | HomeGuide |
| Epoxy floor | sq ft of floor | $3 to $12 | HomeAdvisor |
| Living space above | sq ft of upper floor | $125 to $200 | Fixr |
| Concrete driveway | sq ft | $6 to $15 | HomeGuide |
| Asphalt driveway | sq ft | $5 to $12 | HomeGuide |
| Gravel driveway | sq ft | $4 to $10 | HomeGuide |
The opener, EV charger and epoxy ranges come from HomeAdvisor's 2026 guides.[13][14][15] The mini-split, gutter, grading and driveway ranges come from HomeGuide.[17][18][20][19][21] The finish lines (insulation, drywall, paint and the kitchenette and bathroom in an apartment) come from HomeGuide's 2026 table of garage-with-apartment costs.[5]
Three choices change which range a line uses. The foundation setting picks between the mild-climate slab, the standard slab and a slab with frost footings. The roof and siding settings swap in the published range for the material you choose, from Fixr's $7 to $15 per square foot for architectural shingles to HomeAdvisor's $10 to $20 for brick siding.[4][2] The door grade places the door within its range: basic non-insulated steel at the bottom, insulated steel in the middle, and wood, carriage-house or glass doors at the top. HomeAdvisor lists wood doors at $900 to $4,500 per door and carriage-house doors at $1,200 to $8,000, which is why premium doors sit at the top of the range.[12]
One line without a national average
If you add plumbing to a detached garage, the calculator includes a row for the water and sewer line from the house but leaves it at zero until you enter a quote. We did not find a published national range we trusted for it. The cost depends almost entirely on the trench length and how deep the sewer has to run to keep its slope, and that is different on every lot.
Where the money goes in a basic two-car garage
With the default settings, a stick-built, detached 24 by 24 foot garage with 8 foot walls, one insulated steel double door with an opener, one entry door, two windows, aluminum gutters, a subpanel and a 50 foot power run comes to $46,789 in construction. This is how it breaks down:
| Group | Amount | Share |
|---|---|---|
| Permits and site | $1,634 | 3.5% |
| Foundation | $5,760 | 12.3% |
| Structure (framing, trusses, sheathing) | $18,696 | 40.0% |
| Roof, siding, doors and windows | $14,980 | 32.0% |
| Electrical | $5,719 | 12.2% |
| Construction subtotal | $46,789 | 100% |
| Builder overhead and profit, 10% | $4,679 | |
| Contingency, 10% | $5,147 | |
| Total | $56,615 |
That is $81 per square foot for construction, inside HomeGuide's $50 to $100 range for detached garages, and $98 per square foot with the builder fee and contingency. The total sits near the top of HomeGuide's $25,000 to $60,000 range for two-car garages and well above HomeAdvisor's $26,400 average. Two choices push our default up: it includes a 10% general contractor fee and a 10% contingency, which the guides' totals don't, and it prices framing per square foot of wall, which is how HomeGuide publishes it.[3] Set the builder fee to zero if you will hire each trade yourself.
HomeAdvisor says a general contractor typically charges 10% to 20% of the project cost, which is where our 10% default comes from.[1] The contingency is our own planning figure, not something the guides publish. It is there because garages have their own surprises, from rock under the slab to a main panel that turns out to be too small for a new subpanel.
Attached or detached: what actually changes
HomeAdvisor says a detached garage costs about 20% to 40% more than an attached one.[10] In the calculator, the same 24 by 24 garage comes to $40,642 attached and $46,789 detached, so attached is about 13% cheaper. The difference comes from specific lines, and the code adds some costs back to the attached version.
A detached garage needs more structure and a power line. It has four walls and two gables instead of three walls and one, so more framing and siding. It also needs electricity brought to it. HomeGuide prices an underground line at $10 to $25 per linear foot, and says most cities require the line to a detached building to be buried. A detached garage with more than one circuit also needs a subpanel, which HomeGuide puts at $500 to $1,700.[16]
An attached garage brings fire-separation rules. The 2021 International Residential Code requires the garage to be separated from the house by at least 1/2 inch gypsum board on the garage side, and by 5/8 inch Type X gypsum board under any habitable room above the garage. A door between the garage and the house must be solid wood or solid or honeycomb-core steel at least 1-3/8 inches thick, or a 20-minute fire-rated door, and it must be self-closing and self-latching. A door from the garage straight into a bedroom is not allowed.[8] The calculator adds that door and the fire-separation drywall automatically when you choose Attached, even if you leave the rest of the garage unfinished.
Both types share one more rule: the garage floor has to be a noncombustible material, and the parking area must slope toward a drain or the main vehicle door so spills run out.[8] That is one reason a garage slab costs more to finish than a basement floor of the same size.
Prefab and steel garages
Not every garage is framed on site. The guides publish two comparisons we could use. Fixr prices a prefab attached garage at $40 to $60 per square foot against $60 to $80 for a conventionally built one, which makes prefab about 29% cheaper at the midpoints.[4] HomeAdvisor says the average steel garage costs $10,000 to $25,000 delivered and installed, against about $30,000 for a wood-framed one, which works out to about 42% less.[10]
Those percentages describe whole projects, but a prefab or steel garage only saves money on the building itself. The permit, slab, wiring and site work cost the same however the walls arrive. So the calculator applies the 29% and 42% cuts to the shell lines only: framing, roofing and siding. That is deliberately conservative. In our model, a prefab two-car garage comes to $38,737 and a steel one to $35,127, compared with $46,789 stick-built.
HomeAdvisor's prefab guide is a reminder of what kit prices leave out. It lists most prefab garages at $5,000 to $30,000 for the building, then adds a foundation at $600 to $5,000, delivery at $4 to $10 per mile and electrical work at $1,000 to $2,500.[11] It also notes that prefabricated detached garage kits may not add value to a home, and can even reduce it, while custom-built garages substantially increase it.[1]
Adjusting for your state
The cost guides publish national figures, but what a garage costs depends heavily on local labor. HomeAdvisor says labor makes up 50% to 70% of the cost of building a garage, and in its detached garage guide says labor adds about 60% on top of materials, which is closer to 40% of the total.[1][2] We took the middle ground and treat half of each line as labor.
For the labor half we use the Bureau of Labor Statistics Occupational Employment and Wage Statistics survey for May 2025, which reports the mean hourly wage for construction and extraction occupations in every state. The national mean was $31.42.[9] When you pick a state, each line (except the permit fee) is multiplied by 1 + 0.5 × (state wage ÷ national wage − 1). Permit fees are set by the town, so they aren't adjusted.
| State | Mean wage | Share of US | Garage adjustment |
|---|---|---|---|
| Hawaii | $40.48 | 129% | +14.4% |
| Washington | $39.60 | 126% | +13.0% |
| Illinois | $39.27 | 125% | +12.5% |
| Massachusetts | $39.10 | 124% | +12.2% |
| Alaska | $39.06 | 124% | +12.2% |
| New Jersey | $38.69 | 123% | +11.6% |
| California | $37.64 | 120% | +9.9% |
| New York | $36.85 | 117% | +8.6% |
| Colorado | $31.67 | 101% | +0.4% |
| Michigan | $31.31 | 100% | −0.2% |
| Arizona | $28.86 | 92% | −4.1% |
| Florida | $26.71 | 85% | −7.5% |
| Texas | $26.54 | 84% | −7.8% |
| North Carolina | $26.42 | 84% | −8.0% |
| Alabama | $24.82 | 79% | −10.5% |
| Mississippi | $24.62 | 78% | −10.8% |
| Arkansas | $23.39 | 74% | −12.8% |
For the default two-car garage, that range runs from $40,916 in Arkansas to $53,416 in Hawaii in construction cost. The adjustment covers wages only. Materials also cost more in some places, especially far from suppliers, and the calculator doesn't try to capture that. A local quote does.
Worked examples
These are the calculator's national-average results for common garages, all stick-built with asphalt shingles, vinyl siding and a standard slab unless noted. The total includes a 10% builder fee and a 10% contingency.
| Garage | Construction | Total | Low to high total |
|---|---|---|---|
| 1-car detached, 12×22 | $30,896 | $37,384 | $19,628 to $55,140 |
| 2-car attached, 24×24 | $40,642 | $49,177 | $26,298 to $72,056 |
| 2-car detached, 24×24 | $46,789 | $56,615 | $29,860 to $83,370 |
| 2-car detached, prefab | $38,737 | $46,872 | $24,748 to $68,995 |
| 2-car detached, steel building | $35,127 | $42,504 | $22,457 to $62,551 |
| 2-car detached, finished workshop | $63,751 | $77,139 | $39,959 to $114,319 |
| 3-car detached, 36×24 | $60,838 | $73,614 | $40,354 to $106,874 |
| 2-car detached with apartment above | $157,124 | $190,120 | $130,377 to $249,863 |
Two things stand out. First, the one-car garage costs $117 per square foot of construction against $81 for the two-car garage. The permit, the entry door, the power line and the subpanel cost about the same whatever the size, so they weigh more on a small building. Second, the apartment more than triples the cost. Our figure of $190,120 sits inside HomeGuide's $115,000 to $200,000 range for a 24 by 24 garage with an apartment.[5]
Where the sources disagree, and what we chose
Pulling figures from several guides means choosing between them when they conflict. These are the biggest conflicts and how we handled them.
Framing. HomeGuide prices garage framing at $11 to $30 per square foot of wall area, roof trusses included.[3] Fixr's attached-garage breakdown puts framing and basic drywall for a 24 by 24 garage at $4,500 to $10,500, with the roof as a separate $3,000 to $5,000.[4] We used HomeGuide because it is the more recent figure, published in January 2026, and because it scales with wall area, which lets the calculator respond to taller walls and bigger garages. It is also the main reason our default total sits toward the upper end of the published range. If a framer quotes you a lower price, enter it as your own figure.
Permits. HomeGuide lists garage building permits at $150 to $500, while HomeAdvisor puts them at $1,200 to $1,500.[3][1] We used the full span, $150 to $1,500, with an $825 midpoint, and we don't adjust it by state. Your town's fee schedule is the only reliable figure.
Foundation. HomeAdvisor gives $4 to $8 per square foot for a garage slab, HomeGuide $6 to $14, and Fixr $4 to $6 for a basic monolithic slab, rising to as much as $16 where frost or a room above calls for heavier footings.[2][3][4] Rather than pick one, we turned them into the three foundation choices in the calculator.
Older figures. Most of our ranges were published or updated in 2025 or 2026. The exception is HomeGuide's guide to running electricity to a garage, written in April 2023, which supplies the underground power line and subpanel ranges.[16] We kept it because we did not find a more recent published range for these two items. The calculator labels its source year on every line, so you can see which figures are older.
What this research can and can’t tell you
The calculator is a structured way to budget, not a quote. National averages describe the middle of the market. Your garage will differ in ways a model can't see. Soil that needs extra excavation, a steep driveway, a main panel without room for a subpanel, or a town that requires engineered drawings can each move the price by thousands. The midpoint of a range is also a choice, not a measured average, and some ranges are wide. Metal roofing runs from $4 to $30 per square foot, for example.[4]
What the model does well is show you which decisions matter. Moving from a basic to a premium door is worth a couple of thousand dollars. A room above changes the budget more than anything else. And on a small garage, the fixed costs, from the permit to the power line, are a large share of the total. Use the calculator to set a budget and to compare options, then replace the averages with quotes as they come in.
When we update these figures
We rechecked every range on October 25, 2026. The cost guides update their pages through the year, and BLS publishes new state wage data each spring. We will refresh the calculator when the May 2026 wage estimates are released, and whenever a guide we rely on changes a range.
Enter your garage size, pick attached or detached and your state, then replace any line with your own quote.
Frequently asked questions
How much does it cost to build a garage in 2026?
HomeAdvisor puts the average at $29,584, with most garages between $16,837 and $42,331. HomeGuide puts a two-car garage at $25,000 to $60,000. Our calculator’s default 24×24 detached garage comes to $46,789 in construction before a builder fee and contingency.
What is the cost per square foot to build a garage?
HomeAdvisor gives about $50 per square foot on average, from $30 for a basic attached garage to $120 for a detached one. HomeGuide puts detached garages at $50 to $100 per square foot.
Is it cheaper to build an attached or detached garage?
Attached is usually cheaper because it shares a wall with the house and needs no buried power line. HomeAdvisor says detached garages cost 20% to 40% more; in our model the difference for a 24×24 garage is about 13%.
What is the most expensive part of building a garage?
In our model, the framing, trusses and sheathing are about 40% of a basic two-car garage, followed by the roof, siding, doors and windows at about 32%. A room above outweighs everything else.
How does the calculator adjust for my state?
It treats half of each line as labor and scales that half by your state’s mean construction wage from the BLS May 2025 survey. The adjustment ranges from about −13% in Arkansas to +14% in Hawaii.
Does an attached garage need fire-rated drywall?
The 2021 IRC requires at least 1/2 inch gypsum board on the garage side of the wall and ceiling separating it from the house, and 5/8 inch Type X gypsum board under any habitable room above the garage.
Sources
- HomeAdvisor, "How Much Does It Cost to Build a Garage?", updated June 17, 2026 Verified
- HomeAdvisor, "How Much Does a Detached Garage Cost?", updated June 17, 2026 Verified
- HomeGuide, "How Much Does It Cost to Build a Garage?", January 15, 2026 Verified
- Fixr, "Cost to Build an Attached Garage", updated August 29, 2025 Verified
- HomeGuide, "How Much Does It Cost to Build a Garage with an Apartment?", February 18, 2026 Verified
- NAHB Eye on Housing, "Parking Trends in Newly Completed Single-Family Homes, 2024", September 11, 2025 Verified
- NAHB, "Cost of Constructing a Home in 2024", January 2025 Verified
- International Code Council, 2021 International Residential Code, Chapter 3, Sections R302.5, R302.6 and R309 Verified
- US Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025, construction and extraction occupations (47-0000), state estimates Verified
- HomeAdvisor, "Garage Cost Guides", updated June 17, 2026 Verified
- HomeAdvisor, "How Much Does a Prefab Garage Cost?", updated June 17, 2026 Verified
- HomeAdvisor, "How Much Does Garage Door Replacement Cost?", updated June 17, 2026 Verified
- HomeAdvisor, "Garage Door Opener Installation Cost", updated June 20, 2026 Verified
- HomeAdvisor, "Electric Car Charging Installation Cost", updated June 20, 2026 Verified
- HomeAdvisor, "How Much Does Epoxy Flooring Cost?", updated June 20, 2026 Verified
- HomeGuide, "Cost to Run Electricity to a Shed, Garage, or Shop", April 5, 2023 Verified
- HomeGuide, "How Much Does a Mini Split Installation Cost?", October 8, 2025 Verified
- HomeGuide, "How Much Does Gutter Installation Cost?", October 28, 2025 Verified
- HomeGuide, "How Much Does a Concrete Driveway Cost?", June 3, 2025 Verified
- HomeGuide, "How Much Does It Cost to Level a Yard or Regrade Land?", January 16, 2026 Verified
- HomeGuide, "How Much Does a Gravel Driveway Cost?", December 18, 2025 Verified
Figures last checked October 25, 2026. National averages are a planning guide, not a quote. See our editorial policy and data sources.
