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30×40 Barndominium Shell Cost in Montana (2026)

A 30×40 barndominium shell in Montana has a dried-in shell estimate of about $66,688 in 2026 ($55.57 per sq. ft.). Here's the itemized breakdown of materials, site prep and labor, using local crew rates.

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Shell Materials Kit

$28,312

Frame, trusses, steel, windows, doors & spray foam

= Rows 3–8 below, materials only

Slab, Plumbing Sleeves & Site Prep

$12,044

Grading, under-slab plumbing sleeves & reinforced slab

= Rows 1–2 below, installed price

Dried-in Shell Estimate

$66,688

$55.57 per sq. ft.

Dried-in shell built by a local licensed crew

= All rows below, installed price

A fair bid from a local builder in Montana should land between $61,353 and $73,357. 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

#	Item	Quantity	Materials	Labor	Installed
1	Site grading & building padLaser-leveled pad 2 ft past the walls, compacted fill	1,496 sq ft	$667	$970	$1,964
2	4" standard concrete slab + plumbing sleeves3,500 PSI ready-mix, #4 rebar 18" grid, vapor barrier, forms	15.9 cu yd	$4,821	$3,579	$10,080
3	6×6 treated posts, girts & framing lumber18 posts × 16 ft (.60 CCA ground-contact), 2×6 girts, 2×8 treated skirt board	18 posts + 980 lf	$4,661	$4,851	$11,414
4	30' engineered roof trusses & purlins21 trusses at 2 ft on center, 115 mph rated, 2×4 purlins	21 trusses + 630 lf	$6,668	$2,911	$11,495
5	29-ga metal roof & wall panels + trimPainted steel panels, ridge cap, corner/door/base trim, closures	31.5 squares	$4,362	$1,951	$7,576
6	Doors & windowsDetails in the spec sheet	🔒 Included in $19 spec sheet	$6,352	$1,994	$10,015
7	Closed-cell spray foam (roof & walls)Details in the spec sheet	🔒 Included in $19 spec sheet	$4,567	$1,989	$7,867
8	Screws, hardware & condensation barrierDetails in the spec sheet	🔒 Included in $19 spec sheet	$1,702	$388	$2,508
9	Permit, stamped drawings & deliveryDetails in the spec sheet	🔒 Included in $19 spec sheet	$3,141	$0	$3,769
	Dried-in shell estimate		$36,941	$18,633	$66,688

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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 Barndominium Shell cost in Montana?

About $66,688 for a dried-in shell (structure, roof, walls and doors), built by a local crew. Interior finish, utilities and site work are not included. Roughly $28,312 for the materials kit alone. Most fair bids land between $61,353 and $73,357.

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.