Cost to Subfloor Repair & Replacement in Seattle, WA (2026)
If you’re budgeting a subfloor repair & replacement in Seattle, most projects run $1,227-$6,136, 23% above the $2,500 national average. What moves that number most is usually one thing: Size of Damaged Area. On its own it can swing the cost by $3 - $10 per sq ft, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Remove the existing floor covering yourself to save $1-$4/sq ft ($200-$800 on a typical room)
In the West Coast (where Seattle sits): Highest labor costs.
$1,227-$6,136 in Seattle
23% above the national average · 1.23x cost multiplier
In Seattle, a subfloor repair & replacement runs $1,227 to $6,136 on average - about 23% above what homeowners pay nationwide. The West Coast market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.
Cost Breakdown in Seattle
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per sq ft | $4 | $7 | $12 |
| Materials | $285 | $912 | $2,280 |
| Labor | $512 | $1,922 | $4,484 |
| Permits | $0 | $114 | $228 |
| Total | $797+23% vs. national avg | $2,948+23% vs. national avg | $6,992+23% vs. national avg |
Budget
Small patch repair (25-50 sq ft) of water-damaged plywood subfloor. Cut out damaged section, replace with matching plywood, secure to joists.
Mid-Range
Moderate area replacement (100-300 sq ft) of damaged subfloor with 3/4-inch CDX or tongue-and-groove plywood. Includes existing floor removal, joist inspection, and new subfloor installation.
Premium
Full room or multi-room subfloor replacement (300-600+ sq ft) including joist repair, mold remediation, new 3/4-inch AdvanTech or OSB subfloor, and glue-and-screw installation.
Material Options
Material prices below are national averages; availability in Seattle may shift costs slightly.
| Material | Cost/Unit | Best For |
|---|---|---|
| CDX Plywood (3/4-inch) | $1.00-$1.50/sq ft | Standard subfloor replacement in dry areasIndustry standard, strong, widely available, accepts all flooring types |
| OSB (Oriented Strand Board, 23/32-inch) | $0.80-$1.25/sq ft | Budget replacements in areas with no moisture riskCheapest option, consistent strength, large panel sizes available |
| AdvanTech/Engineered Subfloor | $2.00-$3.00/sq ft | Bathrooms, kitchens, laundry rooms, and any area with moisture riskMoisture-resistant, won't swell, stiffer than plywood, 500-day weather exposure warranty |
| Tongue-and-Groove Plywood (3/4-inch) | $1.25-$2.00/sq ft | Open living areas where squeak prevention mattersInterlocking edges reduce squeaks, stronger joint, smoother surface |
Other Projects in Seattle
Seattle Estimate
Typical Range
$1,227-$6,136
vs. National Average
23% above national
Cost Multiplier
1.23x
Cost Per sq ft
$4-$12
This 1.23x estimate prices Seattle labor from BLS Occupational Employment and Wage Statistics (May 2025) and applies a lighter regional adjustment to materials and permits, which vary less by metro than labor does. Actual bids vary by contractor, project scope, and timing.
See national average costs →