How to use this calculator
- Enter Size.
- Enter Finish level.
- Press Calculate. The highlighted row is your order quantity; the note beneath it translates the number into real-world terms.
Formula & constants
2026 detached garage construction runs $75–$150/sq ft turnkey: one-car (~264 sq ft) $20k–$40k, two-car (~484 sq ft) $36k–$73k, including slab, framing, roof and door. Every default in the fields above is editable — when your supplier’s spec sheet lists a different density, coverage rate or price, enter that number instead. The waste and compaction allowances follow common trade practice; see our methodology page for the derivation of each formula and the standards it references.
Where this fits in the project
Fence runs are linear takeoffs: posts on 8 ft centers, two or three rails per section, then infill. Every post needs a hole below frost line — check the post depth calculator — and about two bags from the concrete bag calculator to set it.
How this connects to your project
No quantity stands alone — each material in the chain depends on the ones around it. These are the planning steps that pair with the garage cost calculator:
- Shed Cost Calculator — Garage is a larger, more complex structure than a shed.
- Concrete Slab Calculator — Garages typically require a concrete slab floor.
- Concrete Cost Calculator — Garage slab is a major cost component.
- Roofing Calculator — Garage roofing material estimation.
- Lumber Calculator — Garage framing uses dimensional lumber.
- Driveway Cost Estimator — Garage construction often includes driveway work.
- Electrical Load Calculator — Detached garages need electrical service.
- Door Cost Calculator — Garage doors are a major cost item.
- Pole Barn Calculator — Pole barn vs stick-frame garage cost comparison.
Frequently asked questions
What drives garage cost most?
The slab and roof are fixed costs — upgrading doors, electrical service and interior finish moves the number more than footprint.
Attached vs detached cost?
Attached saves one wall (~10–15%) but triggers fire-separation drywall requirements on the shared wall.
Last verified: — prices reflect current national averages. See our methodology.
Estimates are for planning. Material densities, coverage rates and prices vary by region and supplier — confirm final quantities before ordering, and check local code where structural or electrical work is involved.