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30×40 Concrete Slab Cost in Missouri (2026)

A 30×40 concrete slab in Missouri costs about $11,235 turnkey in 2026 ($9.36 per sq. ft.). Here's the itemized breakdown of materials, site prep and labor, using local crew rates.

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Concrete & Rebar Materials
$3,929
Ready-mix concrete, rebar, forms & vapor barrier
= Rows 3–6 below, materials only
Excavation & Gravel Base
$2,478
Grading, haul-off & compacted stone base
= Rows 1–2 below, installed price
Turnkey Installed Total
$11,235
$9.36 per sq. ft.
Formed, poured & finished by a local concrete crew
= All rows below, installed price
A fair bid from a local builder in Missouri should land between $10,336 and $12,359. Get 3 quotes, and if one is far outside this range, ask why.

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Itemized cost breakdown

#ItemQuantityMaterialsLaborInstalled
1Excavation & gradingStrip topsoil, cut/fill to grade, haul-off1,480 sq ft$504$574$1,294
2Compacted gravel base (4")Crushed stone, plate-compacted20.7 tons$604$383$1,184
34" ready-mix concrete (3,500 PSI)Includes 5% waste and thickened edges19.2 cu yd$2,354$0$2,825
4#4 rebar grid (18" on center) & chairsTied rebar on chairs, dowels at doors1,760 lf$942$651$1,912
5Forms, pour & finish laborSet forms, place, power-trowel finish, cure1,200 sq ft$341$1,918$2,711
6Vapor barrier & control jointsDetails in the spec sheet🔒 Included in $19 spec sheet$292$305$716
7Concrete pump (trailer-mounted)Details in the spec sheet🔒 Included in $19 spec sheet$280$0$336
8Permit & inspection (if required)Details in the spec sheet🔒 Included in $19 spec sheet$214$0$257
Turnkey total$5,531$3,831$11,235
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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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Common questions

How much does a 30×40 Concrete Slab cost in Missouri?

About $11,235 fully built by a local crew in 2026, or roughly $3,929 for the materials kit alone. Most fair bids land between $10,336 and $12,359.

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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