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30×40 Barndominium Shell Cost in California (2026)

A 30×40 barndominium shell in California has a dried-in shell estimate of about $77,858 in 2026 ($64.88 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

$31,655

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

= Rows 3–8 below, materials only

Slab, Plumbing Sleeves & Site Prep

$14,272

Grading, under-slab plumbing sleeves & reinforced slab

= Rows 1–2 below, installed price

Dried-in Shell Estimate

$77,858

$64.88 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 California should land between $71,629 and $85,644. 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	$746	$1,228	$2,369
2	4" standard concrete slab + plumbing sleeves3,500 PSI ready-mix, #4 rebar 18" grid, vapor barrier, forms	15.9 cu yd	$5,391	$4,528	$11,903
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	$5,212	$6,138	$13,620
4	30' engineered roof trusses & purlins21 trusses at 2 ft on center, 115 mph rated, 2×4 purlins	21 trusses + 630 lf	$7,455	$3,683	$13,366
5	29-ga metal roof & wall panels + trimPainted steel panels, ridge cap, corner/door/base trim, closures	31.5 squares	$4,877	$2,469	$8,815
6	Doors & windowsDetails in the spec sheet	🔒 Included in $19 spec sheet	$7,102	$2,523	$11,550
7	Closed-cell spray foam (roof & walls)Details in the spec sheet	🔒 Included in $19 spec sheet	$5,106	$2,517	$9,148
8	Screws, hardware & condensation barrierDetails in the spec sheet	🔒 Included in $19 spec sheet	$1,903	$491	$2,873
9	Permit, stamped drawings & deliveryDetails in the spec sheet	🔒 Included in $19 spec sheet	$3,512	$0	$4,214
	Dried-in shell estimate		$41,304	$23,577	$77,858

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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

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Common questions

How much does a 30×40 Barndominium Shell cost in California?

About $77,858 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 $31,655 for the materials kit alone. Most fair bids land between $71,629 and $85,644.

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.