Concrete Slab costs $6.61 to $13.22 per sq ft in Wilmington in 2026. For a 400 sq ft project, expect $2,644 – $5,288 installed, typically near $3,966. That is about 8% above the Delaware state average.
Wilmington concrete slab cost calculator
Planning estimate only. State pricing applies a construction wage index to the labor share; materials are held at national prices. Get three written quotes before committing.
Why Wilmington costs more than the rest of Delaware
Wilmington carries roughly a 8% premium over the Delaware statewide figure. Three things drive that gap. Metro wages run above the state average, and labor is about 50% of this bill. Permitting and inspection are slower and more expensive inside city limits. And site access is tighter, which means smaller equipment, more hand work, and sometimes street permits for deliveries.
Statewide, Delaware averages $6.12 to $12.24 per sq ft, against $6.61 to $13.22 inside Wilmington. Suburbs on the metro fringe usually fall between the two.
Concrete Slab cost by project size in Wilmington
| Project size | Wilmington range | Typical |
|---|---|---|
| 10×10 (100 sq ft) | $661 – $1,322 | $991 |
| 12×12 (144 sq ft) | $952 – $1,904 | $1,428 |
| 12×16 (192 sq ft) | $1,269 – $2,538 | $1,904 |
| 16×20 (320 sq ft) | $2,115 – $4,230 | $3,173 |
| 20×20 (400 sq ft) | $2,644 – $5,288 | $3,966 |
| 24×24 (576 sq ft) | $3,807 – $7,614 | $5,711 |
| 30×40 (1,200 sq ft) | $7,932 – $15,863 | $11,897 |
Wilmington compared with other Delaware markets
| Area | Cost per sq ft | vs Wilmington |
|---|---|---|
| Dover | $6.18 – $12.36 | -6% |
| Newark | $6.43 – $12.85 | -3% |
| Delaware average | $6.12 – $12.24 | −8% |
Ground conditions and code in Wilmington
Permits in Wilmington
A residential permit for this work typically runs around $400 in Delaware, and metro jurisdictions like Wilmington usually sit at the upper end of that range with longer review times. Permit cost is rarely included in a contractor quote, so add it separately. Confirm scope with the Wilmington building department before work begins.
Hiring in Wilmington
Get three written, itemised quotes from licensed and insured contractors, and make sure each specifies the same dimensions and the same grade of material. In a metro market, the cheapest bid often reflects a thinner specification or a crew travelling in from outside the area rather than a genuine saving. Ask for local references and check that the licence is current in Delaware.
Frequently asked questions
How much does concrete slab cost in Wilmington?
In 2026, concrete slab costs $6.61 to $13.22 per sq ft in Wilmington. For a 400 sq ft project, the installed total typically lands between $2,644 and $5,288.
Is Wilmington more expensive than the rest of Delaware?
Yes. Wilmington runs about 8% above the Delaware statewide average, driven by metro wage levels, permitting, and tighter site access.
Do I need a permit in Wilmington?
Most work of this type and value requires a permit. Budget around $400 and allow extra time for review, since metro jurisdictions are typically slower than rural ones.
How do I compare quotes in Wilmington?
Insist on three written, itemised quotes covering identical dimensions, materials, and scope of preparation. A bid far below the others usually signals a reduced specification rather than better value.
Nearby markets
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