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30×40 Concrete Slab Cost in New Hampshire (2026)
A 30×40 concrete slab in New Hampshire costs about $12,112 turnkey in 2026 ($10.09 per sq. ft.). Here's the itemized breakdown of materials, site prep and labor, using local crew rates.
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Itemized cost breakdown
| # | Item | Quantity | Installed |
|---|---|---|---|
| 1 | Excavation & gradingStrip topsoil, cut/fill to grade, haul-off | 1,480 sq ft | $1,405 |
| 2 | Compacted gravel base (4")Crushed stone, plate-compacted | 20.7 tons | $1,274 |
| 3 | 4" ready-mix concrete (3,500 PSI)Includes 5% waste and thickened edges | 19.2 cu yd | $2,969 |
| 4 | #4 rebar grid (18" on center) & chairsTied rebar on chairs, dowels at doors | 1,760 lf | $2,062 |
| 5 | Forms, pour & finish laborSet forms, place, power-trowel finish, cure | 1,200 sq ft | $3,001 |
| 6 | Vapor barrier & control jointsDetails in the spec sheet | 🔒 Included in $19 spec sheet | $778 |
| 7 | Concrete pump (trailer-mounted)Details in the spec sheet | 🔒 Included in $19 spec sheet | $353 |
| 8 | Permit & inspection (if required)Details in the spec sheet | 🔒 Included in $19 spec sheet | $270 |
| Turnkey total | $12,112 |
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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How much does a 30×40 Concrete Slab cost in New Hampshire?
About $12,112 fully built by a local crew in 2026, or roughly $4,129 for the materials kit alone. Most fair bids land between $11,143 and $13,323.
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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