Cost guide

What subfloor repair and leveling costs

Every floor has a flatness requirement, and most old subfloors do not meet it. Leveling compound over a slab, new plywood over a soft spot, sistering a joist: these are priced per square foot of the area that needs it, not the whole room, so a good quote shows where.

$1–$3 per square foot

What moves it

Three things that change the price

Flatness: tile needs 1/8 inch in 10 feet, plank a little more
Rot and soft spots under old bathrooms and kitchens
Slab moisture: a test is cheap, a mitigation coating is not

Your project

Put your own square feet in

Material Square feet Who installs it ZIP code (optional) When

Add the extras a quote will Remove and dispose of the existing floorCarpet is the cheap end, glued-down tile the expensive one.Subfloor repair or levelingLeveling compound, plywood patches, or grinding a slab flat.Transitions and thresholdsRoughly one per doorway; the calculator assumes one per 250 sq ft.New baseboardsEstimated from the room perimeter. Reusing the old ones costs labor only.StairsPer step, treads and risers. Hardwood and tile stairs sit at the high end.

Estimated project range—

National averages: material plus installation per square foot from the same cost tables FlooringFAQ publishes, extras at typical contractor rates. Local labor moves the range; a quote far outside it deserves a question.

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