The average cost per sq ft to build a garage is about $50, according to Angi (updated August 2026), with a typical range of about $30 per square foot for a simple attached garage up to $120 for a high-end detached one. Detached garages cost more per square foot than attached ones. Here is the quick version:
- Attached garage: from about $30 per square foot (Angi).
- Detached garage: $40 to $70 per square foot (Angi), or $50 to $100 (HomeGuide).
- National average project: $29,584, with most homeowners paying $16,837 to $42,331, based on 1,735 projects (Angi).
These are national numbers. Use them to set a budget range, then get a local quote for your lot and town.
Average Cost Per Sq Ft to Build a Garage
A per-square-foot price is a quick way to compare garages of different sizes, but it hides what is included. Angi's $50 average combines labor and materials. It does not cover permits, a new driveway or unusual site work, so add those separately.
Cost Per Sq Ft to Build a Detached Garage
A separate garage, also called a detached garage, costs more per square foot because you build four walls instead of three and run utilities out to a separate building. The two guides give different ranges: Angi says $40 to $70 per square foot, and HomeGuide's detached garage guide (January 2026) says $50 to $100. The gap comes down to finish level and what each guide counts, so treat the full spread as the realistic range. HomeGuide's detached sizes look like this:
| Size | Square feet | Cars | HomeGuide total |
|---|---|---|---|
| 12x24 | 288 | 1 | $14,400 to $28,800 |
| 20x20 | 400 | 2 | $20,000 to $40,000 |
| 24x24 | 576 | 2 | $28,800 to $57,600 |
| 36x24 | 864 | 3 | $43,200 to $86,400 |
Cost Breakdown by Garage Type
If you want the total cost to build a garage rather than a per-foot rate, multiply the floor area by the ranges above, or use HomeGuide's size totals in the detached table. For sizes in detail, see our guides to the cost of a two-car detached garage and the cost to build a 3-car garage.
Per Square Foot by Building Material
Angi also breaks the price down by how the garage is built:
- Stick-built (wood frame): $40 to $70 per square foot.
- Metal: $15 to $35.
- Cinderblock: $30 to $65.
- Prefab pole barn: $40 to $85.
Factors Influencing Garage Construction Costs
Size
Size has the biggest effect on the total. Every added square foot means more foundation, framing, roofing and siding.
Labor
Angi puts labor at 50% to 70% of the total and materials at 30% to 50%. Design and drafting fees add 8% to 15%, according to Angi.
Location and Site
Local labor rates drive most regional differences, per Angi. In northern Massachusetts and southern New Hampshire, the lot itself can move the price: ledge, a slope, drainage and the distance from the driveway all change the excavation and foundation work. Local code also sets the snow load the roof must carry and how the foundation is protected from frost.
Permits
Angi puts permits and pre-build fees at $1,200 to $1,500. Your town's building department issues the permit, and zoning sets how close a detached garage can sit to your property lines.
Detailed Cost Analysis: From Foundation to Finish
The structure is the largest share of a garage's material cost. HomeGuide's figures for a two-car detached garage put the concrete foundation at $2,400 to $6,900, wall framing at $3,200 to $8,000 and roof framing at $2,300 to $11,600. Insulation and drywall are where a basic garage and a finished one split apart, so budget for them from the start if you plan to heat the garage or use it as a workshop. Our two-car detached garage cost guide has the full line-item table, from siding and wiring to doors, windows and gutters.
What Affects the Price Once You Start Planning
A garage price usually changes as the design firms up. One of our home addition clients, Roland M. of North Andover, MA, described it this way: "What I liked, especially, is that we started with a minimum design at a very reasonable cost. Then we were able to work with you to add features and modifications as we went along and our ideas changed." Starting from a basic design and adding features you choose is a practical way to keep a garage budget under control too.
We do not have a stand-alone garage case study to share, so the figures on this page come from the national guides named above, not from our own garage jobs.
Frequently Asked Questions
What is the most expensive part of building a garage?
Labor is the largest share, at 50% to 70% of the total according to Angi. Of the building parts, the structure costs the most: HomeGuide puts roof framing for a two-car detached garage at $2,300 to $11,600, more than any other single item.
Is it cheaper to build a garage or buy a kit?
A kit or prefab garage is cheaper up front. HomeGuide puts a two-car prefab unit at $7,200 to $26,000 for the unit only, before the foundation, site prep, wiring and installation, compared with $20,000 to $57,600 for a two-car detached garage built on site. A built garage costs more but can match your home and fit your vehicles.
How much does it cost to build a garage with living quarters?
According to HomeGuide, a detached garage with an apartment or living space costs $80,000 to $300,000, depending on size and materials. Most have a bedroom, a bathroom and a kitchen, which brings plumbing, heating and more inspections.
How do I estimate the cost of building a garage?
Multiply the floor area by a per-square-foot range, then add the items that range leaves out. For example, a 24x24 garage is 576 square feet. At Angi's typical $30 to $120 per square foot, that works out to roughly $17,000 to $69,000. Then add permits ($1,200 to $1,500 per Angi), any driveway, and site work for ledge or a slope. A local builder's quote replaces the estimate once you have a plan.
Is it cheaper to build an attached or detached garage?
Attached is usually cheaper. Angi starts attached garages at about $30 per square foot and puts detached garages at $40 to $70, because an attached garage shares a wall with the house and sits closer to the utilities. A detached garage needs four full walls and its own utility runs.
How much does it cost to build a 30x30 garage?
A 30x30 garage is 900 square feet, about a three-car size. At Angi's typical $30 to $120 per square foot, that is roughly $27,000 to $108,000 before permits and site work. HomeGuide's closest size, a 36x24 detached garage of 864 square feet, runs $43,200 to $86,400. See our 3-car garage cost guide for that size.
Does homeowners insurance cover a detached garage?
Often, yes. Many homeowners policies cover detached structures such as a garage under a separate "other structures" section, usually with a limit set as a percentage of the coverage on the house. A large or finished garage can be worth more than that limit, so check your policy and ask your agent before you build whether you need more coverage.
Talk to a Local Builder
A per-square-foot figure gets you a budget range. A site visit tells you what your lot, your town and your plans will add. For a garage or any other addition, see our home additions page, and if you are attaching the garage to the house, our guide to adding a garage to an existing house.
Norman Builders is a design-build home builder and remodeler, started by Ryan Norman in 2007 and based at 63 Peaslee Crossing in Newton, NH. We build home additions, including attached and detached garage additions, across the Merrimack Valley, the North Shore, the Seacoast and southern NH. See our service area, call (978) 833-7337, or request an estimate.
