Concrete Calculator › Cost by city › Seattle, WA

Concrete Cost in Seattle, WA

Concrete for a 20×20 ft (400 sq ft) 4-inch concrete slab in Seattle, WA costs about $852 ($724–$980). Local 2026 price is around $172 per cuyd. Free calculator inside.

Estimated cost — a 20×20 ft (400 sq ft) 4-inch concrete slab

$852

Typical range $724 – $980 · about $172 per cuyd in Seattle

Local unit price

$172

You need

4.94 cu yd

State factor

WA ×1.15

Estimate your own Seattle project

Prices in Seattle, WA run about +15% versus the national average. Enter your dimensions — the calculator starts from the local $172 per cuyd rate; change it to your supplier's quote for an exact figure.

Length (ft)

Width (ft)

Depth (in)

You need

4.94 cu yd

Estimated material cost $852

Area

400 sq ft

Volume

133.33 cu ft

80-lb bags

223

Concrete cost in nearby cities

Spokane, WA Tacoma, WA Vancouver, WA Bellevue, WA

← Full Concrete Calculator

Regional estimate = national average adjusted by a WA cost factor. Not a quote. Actual prices vary by site conditions, access, and supplier.