How Much Does a Concrete Foundation Cost?
A concrete foundation costs $6 to $50 per square foot in 2026, with a slab-on-grade running $6 to $14 per square foot, a crawl space $15 to $22, and a full basement $20 to $50 unfinished. For a typical 2,000 square foot home, that works out to about $12,000 to $28,000 for a slab and $70,000 or more for a basement. Below is the breakdown by foundation type, what drives the price, and real examples for common house and garage sizes.
Key takeaways
- Slab-on-grade foundations run $6 to $14 per square foot, the cheapest option and used on about 73% of new US homes.
- Crawl space foundations cost $15 to $22 per square foot; full basements run $20 to $50 per square foot unfinished.
- A 2,000 sq ft slab foundation costs roughly $12,000 to $28,000; a basement of the same footprint runs $70,000 or more.
- Concrete footings alone cost $5 to $25 per linear foot installed, averaging around $8 to $15.
- Labor makes up about half the total cost, with rates of $50 to $80 per hour in the Midwest and South versus $80 to $150 in coastal markets.
Concrete foundation cost by type
Foundation cost depends mostly on which type you build. A slab-on-grade is the cheapest because it skips excavation and stem walls, while a full basement costs the most because it needs deep excavation, footings, walls and waterproofing.
| Foundation type | Cost per sq ft | 2,000 sq ft home |
|---|---|---|
| Slab-on-grade | $6 to $14 | $12,000 to $28,000 |
| Crawl space | $15 to $22 | $30,000 to $44,000 |
| Stem wall | $6 to $21 | $12,000 to $42,000 |
| Full basement (unfinished) | $20 to $50 | $40,000 to $100,000+ |
Slabs dominate new construction because they are fast to pour and need no crawl space ventilation or sump pump. Basements cost more upfront but add livable or storage square footage that a slab cannot, and they are far more common in colder states such as Michigan, Minnesota and Pennsylvania, where deep footings are already required by frost depth.
Concrete footing cost per linear foot
Footings are the strip of concrete under a foundation wall or slab edge that spreads the building's weight into the soil. They cost $5 to $25 per linear foot installed in 2026, averaging around $8 to $15, with labor alone running $0.50 to $8 per linear foot and the rest going to concrete, forms and rebar.
A standard single-story home has a foundation perimeter of roughly 150 to 180 linear feet, so footings alone typically add $1,000 to $3,000 to a slab or crawl space job, more on sloped or poor-bearing soil that needs wider or deeper footings. For an exact number based on your perimeter, depth and width, plug your measurements into the concrete footing calculator.
Footing depth is set by local frost line and code, not preference, so it varies by climate and can add cost even on a simple slab job. If you are not sure how deep to dig, see how deep a footing should be for frost-depth guidance by region.
What drives the price up or down
Thickness is the biggest material variable. A 4-inch slab uses a standard 3,000 PSI mix, and each extra inch adds roughly $0.75 to $1.25 per square foot. Rebar or wire mesh reinforcement adds another $1.40 to $4.00 per square foot depending on spacing and bar size.
Labor is about half the total bill, at $3 to $7 per square foot or $50 to $80 an hour in the Midwest and South versus $80 to $150 in coastal metros like California and the Northeast. Site conditions matter too: soft soil, a steep lot or a high water table can push excavation and footing width well above the base estimate, and permits or engineered soil reports add a few hundred dollars more in most jurisdictions.
Footing width also scales with soil bearing capacity. Weaker or sandy soils need a wider footing to spread the load, which is covered in how wide a footing should be.
Foundation cost examples for common sizes
Real numbers help more than a per-square-foot range. Here is what a slab-on-grade foundation costs at a few common footprints, using the $6 to $14 per square foot range and assuming average soil and no unusual site work.
| Footprint | Area | Slab foundation cost |
|---|---|---|
| 20 x 20 ft (garage or shed) | 400 sq ft | $2,400 to $5,600 |
| 30 x 40 ft (shop or garage) | 1,200 sq ft | $7,200 to $16,800 |
| 2,000 sq ft home | 2,000 sq ft | $12,000 to $28,000 |
A 2,000 square foot house on a crawl space instead runs about $30,000 to $44,000, and the same footprint on a full basement runs $40,000 to $100,000 or more unfinished, before any interior finishing. These figures assume a straightforward rectangular footprint; L-shaped or split-level homes add perimeter and cost.
Is a slab cheaper than a basement
Yes, a slab-on-grade foundation is almost always cheaper than a basement. A slab runs $6 to $14 per square foot installed, while an unfinished basement runs $20 to $50 per square foot, roughly two to four times more for the same footprint.
A basement's higher cost buys usable square footage a slab does not provide, which is why it can still pay off in colder climates where deep footings are required anyway. Finishing that space into livable area adds another $30 to $50 per square foot on top of the shell cost, so a fully finished basement can approach the price of the home's above-grade square footage.
For a garage, deck or addition footing rather than a full house foundation, the sizing math is the same but the scale is smaller. See deck footing size for post-footing dimensions on a smaller structure.
Frequently asked questions
How much does a 20x20 concrete foundation cost?
How much does a foundation cost for a 2000 sq ft house?
How much does a 30x40 concrete foundation cost?
Is a slab foundation cheaper than a basement?
How much do concrete footings cost by themselves?
References
- Foundation (engineering), Wikipedia
- ACI 332: Residential Concrete Code
- NAHB: new home construction data
- NRMCA: Ready Mixed Concrete