Cost to Build a Garage Calculator
Detached or attached garage shell from length and width, door count size, finish level, electrical scope, and slab spec — scaled by state.
Your garage
Length (ft)
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Length
Outside dimension parallel to door openings. |
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Width (ft)
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Width
Depth of the garage — 22–24 ft fits most SUVs. |
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Door openings
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Doors
Count and size of overhead door bays drive framing and header cost. |
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Interior finish
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Finish
Shell-only vs insulated workshop interiors. |
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Electrical
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Electrical
Basic circuits vs EV-ready subpanel load. |
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Slab spec
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Slab
Thickened edges and rebar suit heavy lifts or freezers. |
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Your state
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Your state
Scales midpoints for typical state-level labor and material costs versus the U.S. average. Not a local contractor bid. |
How to use this calculator
- Enter garage length and width.
- Choose door bay layout and interior finish tier.
- Select electrical scope and slab specification.
- Pick your state and review the itemized breakdown.
Results explained
Structure, foundation, doors, electrical, and a permits line are separated so you can see where detached garage bids cluster.
Quick reference: garage build drivers
| Component | Midpoint hint |
|---|---|
| Insulated shell | ~$78/sq ft |
| Double door opening | ~$6,800 |
| EV electrical | ~$5,200 |
How the estimate is built
Structure per sq ft by finish tier + slab per sq ft + door flat fee + electrical flat fee + permits midpoint, state scaled.
Example scenario
24×24 ft insulated garage, double door, basic electrical ≈ $52,000 band before state scaling (see live calculator).
FAQ
Attached vs detached?
Shared-wall savings are not modeled — use footprint as a conservative detached midpoint.
Apartment above?
Living space over the garage is a different calculator scope entirely.
Heat and AC?
HVAC is not included — workshop tier assumes passive shell plus electrical only.