Detached garage cost & ROI: what it costs, and how much value it adds
A detached garage is one of the most common backyard builds — but only two questions decide whether it's worth it: what does it cost, and how much of that do you get back? Here are the 2026 cost ranges by size, the resale value a garage actually adds, the over-improvement trap that catches homeowners, and how to check the numbers for your specific lot.
What a detached garage costs (2026)
A basic detached garage commonly runs $40–$70 per square foot for the shell and slab; a finished, insulated, or heated build with wiring, drywall, and multiple doors runs higher. Because it needs its own foundation, walls, and roof, a detached garage typically costs 10–15% more than an attached one of the same size. Multiply your intended size by a realistic cost-per-foot, then add the extras below.
| Size | Typical footprint | Ballpark cost |
|---|---|---|
| 1-car | 240–384 sq ft | $10,000–$28,000+ |
| 2-car (most common) | 400–576 sq ft | $16,800–$57,600 |
| 3-car | 600–816 sq ft | $28,000–$70,000+ |
How much value a detached garage adds (ROI)
A permitted detached garage typically recovers about 60–85% of its cost at resale — commonly $12,000–$36,000 of added value for a two-car — on top of the day-to-day utility of secure parking, storage, or a workshop. Two things decide where you land in that range:
- Permits. An unpermitted structure rarely counts toward appraised value and can complicate a sale — the value figures above assume a permitted, code-compliant build.
- Neighborhood comps. The market only pays for what nearby homes support. A garage adds more where covered parking is scarce and less where every house already has one.
The honest takeaway: a garage is usually a partial-recapture-plus-utility play, not a profit machine. It gives back most of its cost, not more than 100% — so the goal is to size and spec it so the recapture stays high and the utility is real.
480 sq ft, mid-market build
The garage returns about two-thirds of its cost in resale value and the rest in utility. That's a reasonable trade for many homeowners — but if you want a structure that pays you back in full, the math changes with a dwelling.
The over-improvement trap
The single most common mistake is building a garage that's too big or too nice for the home. Because neighborhood comparables cap the added value, spending $60,000 on a garage for a $300,000 home won't return proportionally — you've over-improved, and the recapture rate falls. A generic cost calculator can't warn you about this; it only knows the cost, not whether the value pencils for your house on your block. That's the difference between "what will it cost" and "does it pencil."
Garage, or garage-to-ADU?
If your real goal is a structure that pays you back, compare a garage conversion or a detached ADU. A permitted dwelling adds rental income and a much larger value bump — many penciling ADUs recover their full cost or more, versus a garage's 60–85%. A garage conversion is often the cheapest path to a permitted unit. If income isn't the goal and you just want parking, storage, or a workshop, a plain garage is the simpler, cheaper build. See the ADU feasibility guide to compare the two.
See what a garage — or a garage-ADU — pencils on your lot.
Analyze your structure now →How to check the numbers for your lot
Cost per foot and value recapture are national averages; your lot is specific. The Real Deal Engine Detached Structure engine sizes the buildable footprint after your setbacks, lot coverage, and existing home, applies a per-type construction cost, and — for paid reports — estimates the added value from your home's own price-per-square-foot with an over-improvement flag, plus a risk-and-sensitivity range. Enter an address and pick "Detached Garage" to get a site-specific read instead of a generic range.
Frequently asked questions
How much does a 2-car detached garage cost?
Commonly $16,800 to $57,600, averaging around $30,000, depending on size, finish, door count, and site work. A basic shell runs about $40–$70 per square foot; finished and heated builds run higher.
Does a detached garage add value to a home?
Yes, when permitted — typically 60 to 85 percent of its cost recovered at resale (often $12,000–$36,000 for a two-car), plus utility. An unpermitted structure rarely counts toward appraised value.
Is a detached or attached garage better for value?
Attached garages usually cost 10–20 percent less to build and can recapture slightly more in some markets; detached garages offer more flexibility (workshop, future ADU conversion) and privacy. The right choice depends on your lot and goals.
Do I need a permit for a detached garage?
Almost always — garages house vehicles, usually involve a concrete foundation and electrical, and exceed the small-shed exemption most codes use. A permitted build is also what protects the resale value.