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30×40 Detached Garage Cost in Maine (2026)

A 30×40 detached garage in Maine costs about $56,238 turnkey in 2026 ($46.87 per sq. ft.). Here's the itemized breakdown of materials, site prep and labor, using local crew rates.

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Materials Package
$22,009
Studs, trusses, sheathing, shingles, siding & doors
= Rows 3–7 below, materials only
Slab & Site Prep
$10,618
Grading, thickened-edge footing & concrete floor
= Rows 1–2 below, installed price
Turnkey Installed Total
$56,238
$46.87 per sq. ft.
Complete garage built by a local licensed crew
= All rows below, installed price
A fair bid from a local builder in Maine should land between $51,739 and $61,862. Get 3 quotes, and if one is far outside this range, ask why.

Estimate only. Actual prices vary. No guarantee or warranty. Use as a guide only. Read the full disclaimer

Itemized cost breakdown

#ItemQuantityMaterialsLaborInstalled
1Site grading & padClear, level & compact the building pad1,496 sq ft$604$926$1,836
24" slab with thickened-edge footing3,000 PSI concrete, rebar, vapor barrier, forms21.4 cu yd$4,289$3,029$8,782
32×6 wall framing & sheathing129 studs, treated plates, headers, 7/16" OSB129 studs + 48 sheets$2,485$4,712$8,636
4Roof trusses & roof sheathing21 trusses at 24" on center, 6/12 pitch, OSB decking21 trusses + 47 sheets$4,842$2,356$8,638
5Architectural shingles & lap siding30-yr shingles, synthetic underlayment, engineered-wood lap siding & trim15.0 squares + 1,513 sq ft$7,236$5,161$14,876
6Garage & entry doorsDetails in the spec sheet🔒 Included in $19 spec sheet$6,286$1,346$9,158
7Basic electricalDetails in the spec sheet🔒 Included in $19 spec sheet$1,160$1,010$2,604
8Permit, nails/hardware & dumpsterDetails in the spec sheet🔒 Included in $19 spec sheet$1,423$0$1,708
Turnkey total$28,325$18,540$56,238
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Prices use 2026 material costs and typical local crew rates. Site work, custom options and material price swings can move your final price.

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Builder Spec Sheet & Shopping List

The same line items as this page in an editable Excel file and a PDF, each with a short spec, quantity, materials, labor and installed price. Plus a permit and site-prep checklist and a sheet for comparing 3 builder bids. 30-day money-back guarantee.

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Common questions

How much does a 30×40 Detached Garage cost in Maine?

About $56,238 fully built by a local crew in 2026, or roughly $22,009 for the materials kit alone. Most fair bids land between $51,739 and $61,862.

What drives the price up or down?

Site prep (slope, soil, driveway access), floor choice, doors and insulation, and local labor rates. Lumber and steel prices also move a few percent a year.

Do I need a permit?

Most counties require a building permit for structures over 200 sq ft. Call your county building department with your size and location before you order materials.

How do I make sure I'm getting a fair quote?

Get at least 3 itemized bids for the same spec. Compare them line by line against this breakdown and ask about anything far above or below it.

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