What Happens If Rot Is Found Under My Siding?

South Jersey Construction Consultants Inc. — reviewed October 2026

If we find rot under your siding, we stop, photograph it, and show you exactly what we found before touching it — then you approve a written price before any repair happens. That’s the short answer. Finding some rotted sheathing (the wood panels between the framing and the siding) is common on older South Jersey homes, especially around windows and where roofs meet walls. It’s not a disaster. It’s the reason you tear old siding off instead of covering it, and it’s why your contract should already contain repair unit prices before the first panel comes off.

How common is hidden rot, really?

On homes that are decades old, it’s normal to find at least small soft areas — under a window that leaked for years, at a roof-wall corner that never had kickout flashing, or along the bottom edge where siding sat too close to grade. Whole walls of rot are rare. What matters isn’t whether a contractor finds rot; it’s whether they have a process for it, or use it as an excuse to improvise a bigger bill.

What is our exact process when we find rot?

1. Stop. The crew halts on that elevation. Nothing gets covered up and nothing gets torn out beyond what’s needed to see the damage.
2. Photograph. Wide shots of the wall plus close-ups of every damaged area, with a tape measure in frame so size is clear. You get the photos the same day.
3. Classify. Each area gets one of three labels: OK (sound wood, leave it), repair (replace at the unit price already in your contract), or escalate (structural damage, active leak, mold or insect activity that needs more than a siding crew).
4. Written change order. For repairs, you get a written change order — number of sheets, unit price, total — and you sign it before we cut anything. No verbal approvals, no surprises on the final invoice.
5. Photo after repair. We photograph the new sheathing in place before housewrap and siding cover it. Your closeout file has before and after for every repair.

What is a unit price, and why does it protect you?

A unit price is a fixed price per piece — for example, per sheet of sheathing replaced — written into your contract before work begins VERIFY: SJCC price book / contract unit prices. With a unit price, finding rot changes the quantity, never the rate. Without one, you’re negotiating a repair price mid-job with your wall open. That’s the worst seat at the table, and it’s why we put repair rates in every contract up front.

What if I don’t want to pay for repairs?

Then we show you the photos and you decide with full information. What we won’t do is install new siding over rotted sheathing — the new panels need solid wood to fasten to, and covering rot is how a siding job fails early. If damage is structural, we’ll tell you plainly that a carpenter or engineer needs to look first. If budget is tight, ask us about phasing the work and financing options.

Frequently asked questions

Related reading: our 7-step process and why tear-off beats overlay.