A house foundation cost builders an average of $44,748 in NAHB’s 2024 survey, or 10.5% of construction cost. On a 2,000 sq ft home built at the 2026 US median, that share is about $34,900. A concrete slab is the cheapest at roughly $5 to $8 per sq ft, a crawlspace $6 to $18, and a full basement $30 to $100 per sq ft including excavation.
Change the foundation setting in the detailed view to see how a crawlspace or basement changes the total.
How much does each type of foundation cost?
| Foundation | Cost per sq ft of footprint | 1,500 sq ft footprint |
|---|---|---|
| Concrete slab | $5–$8 (plus stem walls where needed) | $7,500–$12,000 |
| Crawlspace | $6–$18 | $9,000–$27,000 |
| Pier and beam | $7–$11 | $10,500–$16,500 |
| Full basement | $30–$100 including excavation | $45,000–$150,000 |
Per-sq-ft rates are from Inch Calculator (last updated 2023); the 1,500 sq ft column is our multiplication. Prices have risen since 2023, and NAHB’s builder survey average of $44,748 shows real-world foundation budgets are often higher than per-sq-ft guides suggest, because they include excavation, retaining walls and backfill.
What does the foundation stage include?
In NAHB’s survey, the foundation stage covers excavation, the concrete footings and walls or slab, retaining walls and backfill. Site preparation, permits and utility connections are counted separately under site work.
What changes the cost of a foundation?
- Soil: clay, rock or a high water table may need engineering, deeper footings or drainage.
- Climate: footings must go below the local frost line, which is why basements are common in the north.
- Slope: sloped lots need taller walls, stepped footings or a walk-out basement.
- Footprint: a two-story house has a smaller footprint, so less foundation per square foot of living space.
- Concrete prices and delivery distance.
Which foundation is right for you?
Slabs suit warm climates and flat lots. Crawlspaces suit sloped or damp sites and give access to plumbing and ducts. Basements add usable space and make most sense where footings must be deep anyway. See basement cost for finishing costs.
Frequently asked questions
How much does a foundation cost for a 2,000 sq ft house?
For a one-story 2,000 sq ft house, a slab at $5 to $8 per sq ft would be about $10,000 to $16,000 by per-sq-ft guides, but builder budgets (NAHB) often run $35,000 or more once excavation and backfill are included.
Is a slab cheaper than a crawlspace?
Usually, yes, by a few dollars per square foot.
More cost breakdowns
- Full cost breakdown by stage
- Foundation cost
- Framing cost
- Roofing cost
- Electrical wiring cost
- Material cost
- Land cost
- Septic system cost
- Well drilling cost
- Driveway cost
- House plans cost
Sources
- NAHB: Cost of Constructing a Home in 2024 (survey published January 2025)
- Pennsylvania Association of Realtors: summary of NAHB 2024 cost figures (dollar amounts per stage)
- Inch Calculator: Cost to install a foundation (last updated July 2023)