A detached garage adds protected parking, storage, or workshop space without touching your house. Building one costs $20,000 to $50,000 in 2026 — about $40 to $70 per square foot — with size and finish level driving most of the range.
What you’re paying for
The bones are the bulk of it: a foundation slab, framing, roofing, siding, and the garage door. Then comes finishing — electrical, insulation, drywall, and any heating — which can add tens of thousands depending on how usable you want the space.
Size and finish set the price
A bare-shell 1-car garage is the low end; a 2- or 3-car with a finished, wired, insulated interior climbs fast. Adding a room above turns the project into something closer to an ADU.
Don’t forget permits and utilities
Detached garages need permits, and running power (or water) out to a standalone structure adds cost the house garage wouldn’t. Budget for both.
How to save on a detached garage
- Build a simple rectangle on flat ground to keep foundation costs down.
- Finish only what you’ll use — a shell now, wiring later.
- Stick to standard sizes for cheaper materials and trusses.
- Get permits upfront to avoid costly rework and resale headaches.
| Item | Typical range | Notes |
|---|---|---|
| Site prep & foundation slab | $3,000 – $10,000 | – |
| Framing & structure | $6,000 – $15,000 | – |
| Roofing & siding | $4,000 – $10,000 | – |
| Garage door(s) | $1,000 – $4,000 | – |
| Electrical, drywall, finishing | $3,000 – $12,000 | – |
| Option | Typical range | Notes |
|---|---|---|
| 1-car (12x20) | $15,000 – $30,000 | – |
| 2-car (20x20) | $25,000 – $50,000 | – |
| 3-car (30x20) | $40,000 – $70,000 | – |
| Garage with room above | $50,000 – $100,000+ | – |
What affects the price
- Size & number of bays Priced largely by square footage; each additional bay adds foundation, framing, roofing, and a door.
- Foundation & site A simple slab on flat ground is cheapest; grading, excavation, or a frost-depth foundation costs more.
- Finishing level A bare shell is cheapest; insulation, drywall, electrical, heating, and plumbing each add cost.
- Permits & utilities Permits, running power, and any water/sewer connections add to the base build.
- Living space above Adding a finished room or apartment over the garage roughly doubles the project — it's effectively an ADU.
Detached garage cost by state
Where you live can change the price as much as the options you pick. Labor is a big part of the bill, and construction workers are paid more in some states than others. A typical detached garage job costs about $23,400 to $58,500 in Hawaii (17% above the U.S. average). In Arkansas, it costs about $17,000 to $42,500 (15% below the U.S. average).
See the typical cost in all 50 states and D.C.
| State | Typical range |
|---|---|
| Alabama | $17,400 – $43,500 |
| Alaska | $23,000 – $57,500 |
| Arizona | $19,000 – $47,500 |
| Arkansas | $17,000 – $42,500 |
| California | $22,400 – $56,000 |
| Colorado | $20,000 – $50,000 |
| Connecticut | $21,400 – $53,500 |
| Delaware | $19,600 – $49,000 |
| District of Columbia | $21,600 – $54,000 |
| Florida | $18,200 – $45,500 |
| Georgia | $18,400 – $46,000 |
| Hawaii | $23,400 – $58,500 |
| Idaho | $18,800 – $47,000 |
| Illinois | $23,000 – $57,500 |
| Indiana | $20,200 – $50,500 |
| Iowa | $19,400 – $48,500 |
| Kansas | $19,000 – $47,500 |
| Kentucky | $18,600 – $46,500 |
| Louisiana | $18,000 – $45,000 |
| Maine | $19,600 – $49,000 |
| Maryland | $20,000 – $50,000 |
| Massachusetts | $23,000 – $57,500 |
| Michigan | $20,000 – $50,000 |
| Minnesota | $21,800 – $54,500 |
| Mississippi | $17,400 – $43,500 |
| Missouri | $20,400 – $51,000 |
| Montana | $19,600 – $49,000 |
| Nebraska | $18,800 – $47,000 |
| Nevada | $20,600 – $51,500 |
| New Hampshire | $19,800 – $49,500 |
| New Jersey | $22,800 – $57,000 |
| New Mexico | $18,400 – $46,000 |
| New York | $22,000 – $55,000 |
| North Carolina | $18,000 – $45,000 |
| North Dakota | $20,200 – $50,500 |
| Ohio | $20,000 – $50,000 |
| Oklahoma | $18,200 – $45,500 |
| Oregon | $22,000 – $55,000 |
| Pennsylvania | $20,200 – $50,500 |
| Rhode Island | $20,800 – $52,000 |
| South Carolina | $18,200 – $45,500 |
| South Dakota | $18,000 – $45,000 |
| Tennessee | $18,400 – $46,000 |
| Texas | $18,200 – $45,500 |
| Utah | $18,800 – $47,000 |
| Vermont | $19,400 – $48,500 |
| Virginia | $19,000 – $47,500 |
| Washington | $23,200 – $58,000 |
| West Virginia | $19,000 – $47,500 |
| Wisconsin | $20,800 – $52,000 |
| Wyoming | $19,800 – $49,500 |
These are numbers to plan with, not quotes. Each one is this guide's U.S. range, adjusted for what construction workers earn in that state. See every state cost guide or how we estimate.
Common questions
- How much does it cost to build a 2-car detached garage?
- A standard 2-car detached garage (about 20x20) runs $25,000–$50,000 in 2026, or roughly $40–$70 per square foot. Finishing level — bare shell vs. insulated, wired, and heated — drives most of the spread.
- Is a detached garage cheaper than attached?
- Attached garages are often a bit cheaper per square foot because they share a wall and existing utilities. Detached gives more flexibility and placement options but needs its own foundation and utility runs.
- Does a detached garage add home value?
- Yes — a garage adds usable, weatherproof space and appeals to buyers, typically recouping a solid share of the cost. A garage with finished space above adds even more, though at a much higher build cost.
- Do I need a permit to build a detached garage?
- Almost always. Detached garages require building permits and must meet setback, size, and sometimes design rules. Permits and inspections are part of the cost — and skipping them causes problems at resale.
- How much to add a room above the garage?
- Adding finished living space or an apartment over a garage can push the total to $50,000–$100,000+, since it adds a second floor, insulation, HVAC, and often plumbing — essentially building an ADU.
How we estimate: These are typical U.S. prices for materials and for hiring a pro to install them. We checked them against the 2026 sources listed below (see how we get our numbers). Your price depends on where you live, the size of the job and the materials you pick. Get two or three written bids before you choose a contractor.
Sources
We checked the prices on this page against 2026 numbers from these sources: