A detached garage typically costs between $10,000 and $55,000 or more, with most homeowners landing in the $20,000 to $40,000 range for a standard two-car build. The biggest factors are square footage, foundation, and how far you finish the inside. Budget roughly $40 to $70+ per square foot for a basic shell, more once you add insulation, drywall, and heat.
TL;DR: A detached garage runs about $40 to $70+ per square foot for a basic shell, varying by region and finish. A one-car runs roughly $10,000 to $25,000, a two-car $20,000 to $40,000, and a three-car $30,000 to $55,000+. Foundation and finishing are the two priciest pieces.
Size drives the price more than any other factor, so the cleanest way to budget is by car capacity. A one-car detached garage usually runs about $10,000 to $25,000. A two-car, the size most homeowners build, lands around $20,000 to $40,000. A three-car pushes $30,000 to $55,000 or higher. These are approximate and depend heavily on your region and how much finishing you want.
| Garage Size | Typical Cost Range |
|---|---|
| 1-car | ~$10,000 to $25,000 |
| 2-car | ~$20,000 to $40,000 |
| 3-car | ~$30,000 to $55,000+ |
The spread inside each range is wide for a reason. A bare shell with a slab, framing, siding, and a single door sits near the low end. Add insulation, drywall, an electrical subpanel, and heat, and you move toward the top. Before you commit to a footprint, it helps to think through whether the extra bay earns its keep, which the detached garage buyer guide walks through in plain terms.
Five line items move your budget the most: square footage, foundation, garage doors and openers, electrical, and finishing. Square footage sets the baseline because every extra foot multiplies material and labor. The foundation comes next, and it is one of the largest single costs in the whole project.
Garage doors and openers are the second heavyweight. A single insulated door with an opener costs far less than two or three wider, taller doors. Electrical matters too. Running a subpanel out to a detached structure costs more than tapping an existing one, because the wire has to travel and often gets buried or trenched.
Finishing is where budgets quietly balloon. Insulation, drywall, and a heat source can add thousands on their own. The pour itself sets the tone for everything above it, and choosing the right slab or footing approach early saves money later, since the best foundation depends on your soil and climate.
The foundation and the garage doors are consistently two of the largest single line items in a detached garage budget.
The foundation carries the entire structure, so it cannot be shortcut. A concrete slab needs excavation, grading, forms, gravel, rebar, and the pour itself, and each step adds labor. In cold regions you also need footings that reach below the frost line, which means deeper digging and more concrete. Poor soil or a sloped lot pushes the number higher still, because the site has to be prepped before any concrete arrives.
This is why two garages of the same size can differ by thousands. A flat, well-drained lot with stable soil pours cleanly. A sloped or wet lot needs retaining work, extra fill, or a thicker slab. According to Bob Vila’s cost-to-build-a-garage breakdown, foundation and site prep regularly rank among the most variable costs in any garage project, which matches what most builders see on the ground.
A prefab metal garage kit is the lower-cost path. The panels arrive pre-cut, assembly is fast, and you skip much of the custom framing labor. If you want a clean, dry space to park and store, a kit gets you there for less. The trade-off is finishing. Metal kits are harder to insulate, drywall, and heat to a comfortable level.
A custom stick-built garage costs more upfront, but it gives you full control. You can match your home’s siding, add windows where you want them, run the wiring for a workshop, and finish the interior to whatever standard you like. If the garage doubles as a shop, gym, or hobby space, the custom route usually earns the extra cost over time.
Finishing is the swing factor between a bare shell and a usable, year-round room. A slab-and-shell garage works fine for parking. The moment you want to spend real time inside, you add insulation, drywall, an electrical subpanel, lighting, outlets, and a heat source. Each layer stacks onto the per-square-foot cost, which is how a build moves from the low end of its range toward the high end.
Decide your end use before you finalize the budget. Parking and storage need very little finishing. A heated workshop or a flex room needs all of it. That single decision often separates a $25,000 garage from a $40,000 one at the same footprint. If resale is part of your thinking, a finished detached garage tends to return more than a bare one, a point covered in detail in how much a detached garage increases home value.
A two-car detached garage typically costs between $20,000 and $40,000, depending on your region and finish level. A bare shell with a slab and a single door sits near the bottom. Insulation, drywall, an electrical subpanel, and heat push it toward the top of that range.
Foundation work and finishing the interior are the two most expensive parts. The foundation involves excavation, grading, forms, and concrete, and it cannot be shortcut because it carries the whole structure. Finishing, meaning insulation, drywall, electrical, and heat, can add several thousand on its own.
A prefab metal kit is usually cheaper than a custom stick-built garage because the panels come pre-cut and assembly is faster. A custom build costs more but lets you fully insulate, finish, and tailor the space. The right choice depends on whether you want a basic parking structure or a finished room.
A basic detached garage shell runs about $40 to $70+ per square foot, varying by region and finish. Finishing the interior with insulation, drywall, electrical, and heat raises the per-square-foot cost. The exact figure depends on your local labor rates, materials, and how much of the space you complete.
Andy Wu is the resident backyard products expert and hails from Atlanta, Georgia. His passion for crafting outdoor retreats began in 2003.
As a fellow homeowner, he founded Backyard Oasis to provide top-quality furnishings and equipment, collaborating with leading manufacturers.
His main focus is on sheds and generators!
In his spare time he like to hike the tallest mountains in the world and travel with his family.
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