How much does a concrete slab cost in Seattle, WA?
Poured concrete pad with forms, gravel base, and rebar. Priced against Seattle, WA material costs, a typical DIY concrete slab in Seattle runs about $727 in materials — 18% above the national average. These are estimates only, not a quote — enter your real dimensions in the free calculator for a shopping list matched to your build.
Estimates only — not a quote.
Seattle cost breakdown
| Estimate | Low | Typical | High |
|---|---|---|---|
| Seattle (DIY materials) | $618 | $727 | $981 |
| National average | $524 | $616 | $832 |
Priced from the Seattle, WA material index — 18% above the national average. Based on a common-size concrete slab; enter your own dimensions for an exact number.
DIY materials estimate: $727. A contractor in the Seattle market (materials plus about 15 labor hours at ~$78/hr) estimates to $1,823–$2,445. Estimated DIY savings: $1,345 (65%).
Flatwork under about 200 sq ft is often permit-exempt; larger pours and anything structural generally are not.
Outside city limits, King County is typically the permitting authority.
Get your exact Seattle price
Enter your dimensions for a materials list and cost estimate matched to your build.
Frequently asked questions
How much does a concrete slab cost in Seattle, WA?
Materials typically run $618–$981 for a common-size project using Seattle-area pricing. That is an estimate, not a quote — our free calculator prices your exact dimensions.
Is it cheaper to DIY or hire a contractor in Seattle?
DIY materials estimate to about $727. A local contractor estimates to $1,823–$2,445 at the Seattle-area labor rate of roughly $78/hr, so DIY could save an estimated $1,345 (65%).
Do I need a permit for a concrete slab in Seattle?
Flatwork under about 200 sq ft is often permit-exempt; larger pours and anything structural generally are not. King County and the City of Seattle rules can be stricter than the state baseline — run the free permit lookup for your ZIP before buying materials.
Why is Seattle concrete slab pricing different from the national average?
We apply a regional material cost index for the Seattle market — currently 18% higher than the national average. Labor is indexed separately at about $78/hr for the contractor comparison.
Other projects in Seattle
Concrete slab cost in nearby cities
Looking at the whole state? Concrete slab cost in Washington.