Garage Cost Calculator
Estimate a new garage. Pick the size, attached or detached, finish, and your region to see a cost range and per-square-foot price.
Example: with Your region i United States (average) → Estimated cost: $31,680.
- Low estimate$26,928
- High estimate$38,016
- Cost per sq ft$55/sq ft
Computed by the calculator below using its default values. Change any input to see your own numbers.
Garage size
\ud83d\ude97 Get garage-building quotes from local pros
Get quotesDetached vs attached
Detached garages cost more per square foot \u2014 own foundation, four walls, separate utilities \u2014 while attached garages share a wall and run cheaper. Finishing the interior adds roughly 30%.
Standard garage sizes & what new homes get
A one-car garage averages about 12 × 22 ft (~264 sq ft); two-car garages typically run 20×20 to 24×24 ft (400–576 sq ft, with 18×20 the workable minimum); three-car garages start around 32 × 22 ft. Standard doors are 9 ft (single) and 16 ft (double) wide. Garages are near-universal in new construction: in 2024, 65% of newly completed single-family homes had a 2-car garage and 15% had 3+ bays — 80% with 2-car or larger — while only 9% were built with no garage at all. Three-plus-car garages are most common in the West North Central states (33% of new homes).
Dimensions: Danley’s average-garage-size guide; Renuity garage-dimensions guide; Family Handyman door sizes. New-home shares: NAHB Eye On Housing analysis of Census Survey of Construction (2024 data, published 2025).
How it’s calculated & sources
Cost = floor area × per-sq-ft rate (detached or attached) × finish factor. Estimates are then scaled by a regional construction-cost factor for your area (U.S. average = 1.00).
Cost ranges from 2025–26 national home-improvement data (HomeAdvisor, Angi, Fixr and industry guides); regional factors approximate RS Means-style city cost indices. National average 2-car detached garage \u2248 $40,000 \u2014 $40\u201375/sq ft detached, $30\u201355/sq ft attached.
Results update as you type and are estimates, not a quote — site conditions, permits, and finishes move the final number. Verify with local pros.
Frequently asked questions
Does this include the driveway or opener?
No \u2014 it covers the structure. Aprons, driveways, and openers are add-ons.
Why is detached more expensive?
Its own foundation, four exterior walls, and separate utility runs.
How does region change it?
We scale by a regional cost factor, so labor-heavy regions cost more.