Subfloor repair: a guide for pros

What customers ask, how to win the job, and what to put on your profile.

Offering subfloor repair

Subfloor repair is a structural job that customers only understand after it is done, so they value a clear finding and a clear plan. Win the job by finding the water source, documenting the damage and quoting the joist work as its own line.

What customers ask

  • How do you know how far the rot goes?
  • Will the floor be solid after the repair?
  • Do you need to remove the flooring and the baseboard?
  • Who fixes the leak that caused the damage?
  • Do I need a permit for this?

How to win the job

  • On the first visit, probe the soft area and check the joists from below if you can, and photograph the damage and the water source before quoting.
  • Write the water source repair into the proposal as a separate item, and say who will do it and when it must be done.
  • Show the cut-out area on a sketch with the joist locations, the blocking and the new panel layout marked.
  • Quote the joist sister or the replacement by size and length, with the fastener type and spacing named.
  • State the permit and inspection steps in the proposal, along with the engineer's review if the span needs one.
  • Explain the leveling and the transition to the existing floor, so the customer knows the new floor will sit flat.
  • Give the customer a written note on the damage found, with the photos attached for their records.

What to put on your profile

  • Before and after photos of subfloor repairs with the joists and the new panels visible
  • Close-up photos of the water source repair and the flashing or drain fix behind the repair
  • Photos of the joist sistering and the blocking before the new panels go down
  • A list of the framing and subfloor materials you use, with sizes and fastener types

Follow-up that helps the customer

  • A moisture check visit after the first heavy rain or the first heating season
  • A note on the fastening and the floor care, sent with the final invoice
  • A quote for the new floor covering, offered only if the customer asks

Licenses and permits

Subfloor and joist repair often needs a building permit and qualified carpentry, and larger structural repairs may need an engineer's review. Confirm your contractor registration, insurance and any structural credentials in your state and locality before you take the job.

Questions

Should I warranty a subfloor repair?

Warranty the repair you made to the subfloor and joists, and state the limits. Say clearly that new water damage from a source outside the repair is not covered.

What if the joists are worse than the customer expects?

Stop, show the customer the damage with photos and quote the structural repair before you go on. Do not hide structural damage in the subfloor work.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

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