Concrete Slab Cost in Washington
Estimated 2026 installed range: $3,100 – $6,100
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Open the calculatorCost by system type in Washington
| Option | Low | High |
|---|---|---|
| 4-inch slab (400 sq ft) | $3,100 | $6,100 |
| 6-inch slab (400 sq ft) | $4,100 | $8,200 |
| Reinforced slab | $4,600 | $9,700 |
| Slab with footings | $5,100 | $10,200 |
| Stamped / decorative | $6,700 | $12,800 |
Local cost factors
Statewide drivers: West conditions and local labor rates. In Washington, wet soils and strict local health rules drive design costs.