How Much Does It Cost to Build a Detached Garage? Real 2025 Prices

A new detached garage gives you parking, extra storage, and a bump in resale appeal in one project. But before you break ground, the number most homeowners want to lock down first is how much does it cost to build a detached garage. For most people in the United States, the honest range is $19,000 to $45,000, with a national average of roughly $28,000 to $35,000 for a standard two-car structure.

The spread is wide because a garage is not one product. Size, foundation type, siding, roofline, electrical work, and whether the space is finished all move the final bill. A bare-bones single bay and a heated three-car workshop with a mezzanine are not the same project, even if both are technically “a detached garage.”

Below, we break the cost down by national average, square footage, material, and construction method, so you can price your own build accurately instead of guessing.

How Much Does It Cost to Build a Detached Garage? The National Averages

At the top line, expect to spend between $19,000 and $45,000 for a complete detached garage, including materials and labor. A single-car garage (around 12 by 20 feet, or 240 square feet) typically lands between $12,000 and $21,000. A two-car garage (roughly 22 by 22 feet, or 484 square feet) runs $20,000 to $40,000. Go bigger with a three-car or workshop-style build and $50,000 to $70,000 is common.

Measured by floor area, standard wood-framed construction costs about $40 to $70 per square foot. Upscale finishes, spray-foam insulation, a sink feed, and premium siding can push that past $80 per square foot. The “garage cost data” published by Angi puts most projects in this same $40-to-$70-per-square-foot band, which makes it a reliable planning number.

Here is how the three most common builds compare:

Feature	Basic Single-Car	Standard Two-Car	High-End Two-Car / Workshop
Typical footprint	12 ft x 20 ft (240 sq ft)	22 ft x 22 ft (484 sq ft)	24 ft x 24 ft (576 sq ft)
Total cost range	$12,000–$21,000	$20,000–$40,000	$40,000–$70,000
Cost per square foot	$50–$85	$40–$70	$70–$120
Best for	One vehicle + storage	Two cars + tools	Workshop, RV bay, or ADU shell

Cost by Garage Size and Number of Cars

Square footage is the single biggest driver of price, because it scales nearly every other line item at once: more concrete, more lumber, more roof, more siding, more labor.

• One-car (12 x 20 to 14 x 22 feet): $12,000 to $21,000. The cheapest full build, though the cost per square foot is slightly higher because fixed items such as the door opener and service panel get spread over fewer square feet.
• Two-car (20 x 20 to 24 x 24 feet): $20,000 to $40,000. This is the most common request and the value sweet spot, since a 484-square-foot plan catches most of the fixed costs and still leaves room for a workbench.
• Three-car or oversized (30 x 22 feet and up): $50,000 to $70,000+. A third bay adds real floor area but rarely costs three times a one-car because the wall length grows slower than the enclosed volume.
• RV or tall-bay garage: $60,000 to $100,000+. Extra height for a motorhome means taller walls, a taller door, and often heavier framing, so expect a meaningful premium.

If you want a more granular read on pricing per square foot, our guide to detached garage cost per square foot walks through the math in detail.

Photo by Erik Mclean via Pexels

Cost by Material and Style

The shell material changes the number more than most homeowners expect. A garage framed from standard dimensional lumber and wrapped in vinyl or metal siding is the least expensive; brick, stone veneer, and cedar add thousands.

• Metal (steel or aluminum) kit: $10,000 to $30,000. The lowest-cost route, quick to erect, and nearly maintenance-free, but visually utilitarian and harder to match to a traditional house.
• Vinyl siding over a wood frame: $19,000 to $35,000. The default choice for most US homes; cheap, low-maintenance, and easy to insulate.
• Wood or engineered-wood siding: $25,000 to $45,000. A warmer look with more upkeep and a higher material cost.
• Brick, stone, or stucco veneer: $35,000 to $60,000+. The most expensive finish, usually selected to match the main house rather than for function.

Roofing follows the same pattern. Basic architectural shingles cost less than $5 per square foot of roof; standing-seam metal or cedar shake can more than triple that figure on the same footprint.

What Drives the Price: Foundation, Framing, and Finishes

Beyond size and siding, four line items quietly determine whether you land at $20,000 or $40,000.

Foundation and slab

A garage needs a concrete slab, and a proper one is a 4-to-6-inch pour with a thickened edge or footing. Expect $4 to $8 per square foot of slab, plus more if you need frost-depth footings, a stem wall, or site grading. This item alone is often $5,000 to $12,000 of the total.

Electrical

Code requires the garage to tie into your panel, and most homeowners want more than a single light. A subpanel, several outlets, LED fixtures, and a dedicated circuit for tools or an EV charger typically run $2,000 to $6,000. A Level 2 EV charger with a new circuit can add $1,500 to $3,000 on its own.

Insulation and finishing

An unfinished shell is cheaper than a finished one by $10 to $20 per square foot. Batting the walls, hanging drywall, adding a heater, and painting turns a storage shed into a usable room, but it is a real line item. New Jersey-based contractor estimates compiled by Bob Vila show finishing and insulation commonly adding $5,000 to $15,000 depending on the size.

Door, opener, and hardware

A 16-foot insulated steel door with an automatic opener runs $2,000 to $5,000 installed. This is one item worth not skimping on: the door is the largest moving part of the building and the first thing to fail if it is undersized.

Photo by Dmitry Alexandrovich via Pexels

Built On-Site vs. Prefab vs. Metal Kit

How the garage is assembled affects the price as much as what it is made of.

• Stick-built on-site: $40 to $70 per square foot. The most expensive, but the most flexible for custom footprints, matching your house, and future finishing.
• Prefab or modular panel construction: 10% to 25% less than stick-built. Panels are cut off-site and assembled quickly, which cuts framing labor on the lot.
• Metal or steel kit building: $10,000 to $30,000 all-in. The cheapest option, often delivered and erected in days, though customization and finishing are limited.

If you are weighing whether to attach a garage to the house at all, read our comparison of detached garage vs. attached garage cost before you commit, since the choice changes the foundation and roofing math.

How to Save Money on a Detached Garage

You do not need to sacrifice quality to pull $5,000 to $15,000 out of the estimate. These moves deliver the most savings for the least risk:

• Build a standard rectangular plan. Custom angles, bump-outs, and dormers add engineering and framing hours for almost no usable space.
• Skip the finishing for now. Build the weather-tight shell and drywall later; you save $10 to $20 per square foot and can insulate when the budget allows.
• Handle demo, cleanup, and site prep yourself. Renting a dumpster and clearing the pad is unskilled labor you can do over a weekend.
• Use vinyl or metal siding instead of brick. The shell choice alone can be worth $15,000 on a two-car garage.
• Buy a package door and opener during a sale. Big-box stores discount insulated doors seasonally; the savings are often $500 to $1,000.
• Get at least three written quotes. Prices for identical plans routinely vary by 20% to 30% between contractors in the same zip code.

And if a fully enclosed structure is more than you need, remember a carport costs a fraction of a full garage and can cover a vehicle for under $10,000 in many markets.

Frequently Asked Questions

Is it cheaper to build a detached or an attached garage?

A detached garage is usually slightly cheaper per square foot, because it does not have to tie into the house’s structure, match its roofline, or open into the living space. A new attachment typically costs $35 to $70 per square foot, while a detached garage sits closer to $40 to $70 per square foot at the high end.

Do I need a permit to build a detached garage?

Almost always, yes. Most municipalities require a building permit, plus separate permits for the electrical work and sometimes the concrete pad. Permit fees typically run $500 to $2,500 depending on where you live, and skipping them can complicate a future home sale or insurance claim.

How long does it take to build a detached garage?

A simple stick-built or kit garage goes from permit to final inspection in two to four weeks. Foundation curing, custom builds, or added plumbing and a mezzanine can stretch the timeline to six to ten weeks.

Does a detached garage add value to a home?

Yes. Real estate appraisers commonly credit a garage with a 60% to 80% return on construction cost, and more in neighborhoods where off-street parking is scarce. The value is highest when the garage matches the house and is finished to code.

Can I build a detached garage myself?

Skilled DIYers can handle site prep, panel assembly, and some framing, which can cut 25% to 40% of the labor. The concrete slab, electrical service, and roof are better left to licensed pros both for liability and for passing inspection.

The Bottom Line

How much does it cost to build a detached garage? Plan on $19,000 to $45,000 for a standard build, roughly $40 to $70 per square foot, with metal kits at the low end and finished, custom-frame garages at the high end. The three numbers that matter most are your square footage, your siding choice, and how finished you want the space on day one.

Get three itemized quotes, lock the plan before you sign, and decide early whether this is a weather-tight shell or a long-term workshop. Nail those choices and you will get a garage that earns its cost back in storage, parking, and resale value for years.