Unfortunately, this work can't be done while the carpet is still down, so if you've noticed loose subfloor, you'll have to pull the carpet up to fix the problem. ... Good carpet installers will take a few extra moments to examine your subfloor, check if it's loose, and explain what you can do about it.

How much does it cost to repair a subfloor?

The cost varies greatly depending on the type of subfloor you're installing and whether or not you are replacing floor joists. You should plan to spend anywhere from $400-$625 per 100 sq ft (approx. 10 sq metres) which includes materials, labor, and permits.

Can you repair damaged subfloor?

It is very important that your measurement and your cut are accurate. Allow a 1/8th of an inch gap between the new subfloor and the old to allow the new wood space to expand. Replacement subfloor should be attached with fresh nails and hammered into the center of the hole where the damage was removed.