40x40 Concrete Slab Cost
A 40x40 concrete slab costs $13,681 to $22,802 installed at 5 inches with rebar. Enter a ZIP in the calculator to replace national labor rates with local ones.
LIKELY INSTALLED PRICE
$18,242
Our installed range for this 40×40 ft, 5-inch slab: $13,681 – $22,802 ($8.55 – $14.25 per sq ft)
In plain terms: that's about the size of a workshop or pole-barn floor, and roughly 43% of the price is the crew's labor.
- DIY materials
- $10,493
- Concrete
- 24.69 yd³
- Bagged mix
- 1,223 80-lb bags
- Delivery
- 3 trucks
An estimate, not a bid. A contractor's price depends on your site, access and timing.
What changes the price
Where the money goes
- Materials$8,695
- Labor$6,507
- Overhead and profit (20%)$3,040
All 8 line items
| Item | Qty | Material | Labor | Total |
|---|---|---|---|---|
| Site setup, layout and cleanup | 1 job | $100 | $56 | $156 |
| Excavate and grade subgrade | 1,600 sqft | $0 | $1,776 | $1,776 |
| Forms, stakes and form release | 160 lf | $192 | $355 | $547 |
| Compacted crushed-stone base | 27.65 ton | $1,244 | $512 | $1,756 |
| #4 rebar, tied on chairs | 2213.33 lf | $2,208 | $983 | $3,191 |
| Ready-mix concrete, 3,500 psi, delivered | 25.93 yd3 | $4,510 | $576 | $5,086 |
| Place, screed and broom finish | 1,600 sqft | $80 | $2,072 | $2,152 |
| Sawn control joints | 240 lf | $360 | $178 | $538 |
| Subtotal × overhead and profit (20%) = midpoint | $18,242 | |||
National prices until you enter a ZIP.
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Compare a contractor's price with the range for these inputs.
What next
Get two or three quotes and compare them with $13,681 – $22,802. DIY: 1,223 bags or 25.93 yd³ of ready-mix.
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Turn this price into an estimate for your customer →Cost by thickness for 40x40 (1,600 sq ft)
4 in · patios, sheds
$12,766 – $21,276
19.75 yd³ · 978 bags · about $17,021
5 in · garages, driveways
$13,681 – $22,802
24.69 yd³ · 1,223 bags · about $18,242
6 in · shops, RV pads
$14,435 – $24,059
29.63 yd³ · 1,467 bags · about $19,247
- Typical use
- An equipment barn or a multi-bay garage.
- Thickness
- 5 inches with rebar; 6 inches or more under tractors and heavy machinery.
- Planning note
- Mark where any interior posts will land so the crew can thicken the slab under them.
Cost of a 40x40 concrete slab
At 1,600 square feet, concrete is the largest material line, followed by 2,214 linear ft of rebar and 27.7 tons of gravel. Finishing labor is the biggest labor line.
40x40 floor for a barn or shop
A square 40x40 fits several vehicles or a full workshop with open floor. Heavy tractors or lifts may need more than 5 inches; try it in the calculator.
Trucks, pump and crew
The pour needs 25.93 yd³ on 3 trucks. Access to the middle of a 40-foot square usually means a pump truck.
Estimate versus bid
This is an estimate from national wage and material data. It helps you budget and test bids, but it isn't a price offered to you.
DIY vs pro for this 40x40 pour
Materials alone come to $10,493, about 58% of the $18,242 midpoint contractor price. The difference is $7,749 of labor, equipment, delivery and contractor overhead across 8 line items. At 25.93 yd³ with waste the pour fills 3 mixer trucks, so ready-mix is the practical route even for a DIY pour.
Other popular slab sizes
- 20x30 concrete slab cost$4,983 – $8,306600 sq ft · 7.41 yd³ at 4 in
- 20x40 concrete slab cost$6,562 – $10,936800 sq ft · 9.88 yd³ at 4 in
- 30x30 concrete slab cost$7,324 – $12,206900 sq ft · 11.11 yd³ at 4 in
- 30x40 concrete slab cost$9,664 – $16,1061,200 sq ft · 14.81 yd³ at 4 in
- 30x50 concrete slab cost$12,004 – $20,0061,500 sq ft · 18.52 yd³ at 4 in
- 40x60 concrete slab cost$18,970 – $31,6172,400 sq ft · 29.63 yd³ at 4 in
Compare with the next sizes
Garage concrete slab cost calculatorAll slab sizes and the full calculator
Frequently asked questions
How many trucks for a 40x40 slab?
3 trucks for 25.93 yd³. The dispatcher will space them so the crew can keep up.
Is a 40x40 slab a DIY project?
Rarely. It needs a pump, several finishers and power trowels to finish before the concrete sets.
What does a 40x40 slab cost per square foot?
$8.55 – $14.25 at national prices, and less than small pads because setup is spread wider.
Should a 40x40 barn slab have a vapor barrier?
For storage or animals, it's optional. For a heated shop, it keeps moisture off tools and finishes.
For contractors
Quoting concrete for customers?
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