Subfloor
The structural plywood, OSB, or concrete layer beneath all finish flooring, fastened to the floor joists or slab.
Quick answer
Subfloor: The structural plywood, OSB, or concrete layer beneath all finish flooring, fastened to the floor joists or slab. Typical cost: $2–$5 per sq ft to replace; $30–$70 per sheet for spot repairs..
Why it matters
Squeaky floors, bouncy spans, and flooring failures often trace to subfloor problems that get hidden until the next renovation.
Typical cost
$2–$5 per sq ft to replace; $30–$70 per sheet for spot repairs.
Pros
- • Critical structural and acoustic layer
Cons
- • Hidden until finish floor removed
- • Water damage requires full sheet replacement
Common uses
- • Every floor in every home
Alternatives
Self-leveling underlayment on slabs
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Frequently asked questions
- When does subfloor need replacing?
- Visible water damage, sagging, soft spots, or persistent squeaks after multiple repair attempts.
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