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Concrete Slab & Flatwork Cost in Idaho (2026)

Typical price for a 30×40 (1,200 sq ft) 4-inch reinforced slab in Idaho: about $11,473 installed. Use the free itemized estimate below to check contractor quotes.

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Concrete & Rebar Materials
$3,983
Ready-mix concrete, rebar, forms & vapor barrier
= Rows 3–6 below, materials only
Excavation & Gravel Base
$2,534
Grading, haul-off & compacted stone base
= Rows 1–2 below, installed price
Turnkey Installed Total
$11,473
Formed, poured & finished by a local concrete crew
= All rows below, installed price
A fair bid from a local builder in Idaho should land between $10,555 and $12,620. 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
1Excavation & gradingStrip topsoil, cut/fill to grade, haul-off1,480 sq ft$511$592$1,324
2Compacted gravel base (4")Crushed stone, plate-compacted20.7 tons$613$395$1,210
34" ready-mix concrete (3,500 PSI)Includes 5% waste and thickened edges19.2 cu yd$2,387$0$2,864
4#4 rebar grid (18" on center) & chairsTied rebar on chairs, dowels at doors1,760 lf$955$672$1,952
5Forms, pour & finish laborSet forms, place, power-trowel finish, cure1,200 sq ft$345$1,979$2,789
6Vapor barrier & control jointsDetails in the spec sheet🔒 Included in $19 spec sheet$296$315$733
7Concrete pump (trailer-mounted)Details in the spec sheet🔒 Included in $19 spec sheet$284$0$341
8Permit & inspection (if required)Details in the spec sheet🔒 Included in $19 spec sheet$217$0$260
Turnkey total$5,608$3,953$11,473
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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 concrete slab & flatwork cost in Idaho?

For a 30×40 (1,200 sq ft) 4-inch reinforced slab, expect about $11,473 with a local pro in 2026. Fair quotes usually fall between $10,555 and $12,620.

Is this a free estimate template?

Yes. The breakdown on this page is free. The $19 Spec Pack puts these same line items in an editable Excel file and a PDF spec sheet you can hand to contractors, plus a permit checklist and a bid-comparison sheet.

How do I compare contractor quotes?

Ask each contractor to price the same scope, then compare their numbers line by line against this breakdown. A quote far below the range often leaves something out.

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