What is the cost per square foot for subfloor?

Cost per sq ft typically $4–$6 for OSB, $5–$8 for plywood, $6–$12 for T&G. Labor and removal add to total.

OSB vs plywood subfloor cost?

OSB is often $1–2/sq ft less than plywood. Plywood is stronger per thickness and preferred in wet areas. Both need proper thickness for span.

How long does subfloor replacement take?

300 sq ft often 1–2 days. Depends on access, removal of existing floor, and whether finish floor is reinstalled same job.

What is included in subfloor replacement?

Typically: removal of old flooring and subfloor, new subfloor material, install, and fastening. Finish floor is usually separate.

When should subfloor be replaced?

Replace when soft, sagging, water-damaged, or too thin for new flooring. Spot repair may suffice for small areas.

How do I get the best subfloor replacement quote?

Get 2–3 quotes. Specify sq ft and material. Ask if removal and disposal are included. Compare cost per sq ft.

Can subfloor be repaired instead of replaced?

Localized damage can be cut out and patched. Large or structural issues need full replacement. A contractor can assess.

What thickness subfloor do I need?

Often 3/4 in for 16 in joist spacing. Thinner for tighter spacing. Tile may need additional underlayment.

How much does it cost to replace subfloor in one room?

One room (150–250 sq ft) typically $750–$2,500 depending on material and removal. Finish floor extra.

Does subfloor need to be level?

Yes for many finish floors. Leveling (self-leveler or sistering) may be needed and can add $2–$5/sq ft.

Can I replace subfloor myself?

Experienced DIYers can do it with proper tools. Joist condition and fastening schedule matter. Pros ensure code compliance.

What causes subfloor damage?

Water leaks, moisture, rot, or overload. Fix moisture source before replacing. Use appropriate material (e.g. plywood in baths).

How much does subfloor removal cost?

Removal of old subfloor often $1–$3 per sq ft. Included in many replacement quotes.

Does subfloor replacement require a permit?

Structural subfloor work may require a permit. Cosmetic overlay sometimes does not. Check locally.

Subfloor Replacement Cost Calculator

Use this free subfloor replacement cost calculator to estimate cost by material (OSB, plywood, T&G) and square footage. Most projects run $4–$12+ per sq ft. Get a low, average, and high estimate below.

How much does subfloor replacement cost?

Subfloor replacement in the U.S. typically costs $4–$12+ per sq ft: OSB $4–$6, plywood $5–$8. Get 2–3 local quotes.

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These figures are based on national average material and labor costs adjusted for the options you selected. Actual pricing varies with your local market, site conditions, material availability and contractor workload. Always get two or three written quotes before committing to a project.

Average Subfloor Replacement Cost

National averages run $4–$12+ per sq ft. Final cost depends on material.

Cost by material (per sq ft)

Typical ranges

Material	Estimated cost
OSB	$4–$6
Plywood	$5–$8
Tongue-and-groove	$6–$12+

Cost factors

What drives the total

Factor	Impact
Removal of old floor	$1–$3/sq ft
Finish floor reinstall	Separate quote

What Affects Subfloor Replacement Cost?

Material — Plywood and T&G cost more than OSB.
Removal — Removing existing flooring adds cost.
Access — Confined spaces or multiple layers add labor.

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