Motorhome Damp: What to Look For Before Buying

Motorhome damp: what to look for

Written and reviewed by our experienced team. Last updated 26 July 2026.

Damp is the most expensive hidden fault in a used motorhome, because water ingress rots the timber frame and delaminates panels. Check the corners, around windows and roof lights, under seating and along the floor for soft spots, staining, bubbling walls and a musty smell. A damp meter reading is the most reliable test.

Where damp hides

Corners and seams, where panels meet.
Around windows, roof lights and the door.
Under and around seating and the bed base.
The floor, especially near the door and under mats: press for soft spots.
Overcab areas on coachbuilt motorhomes.

Reading a damp meter

Low readings (roughly under 15 percent) are normal. Readings climbing above about 25 percent point to active damp and expensive repairs. A history check cannot detect damp, so this is one to inspect in person.

Why it matters so much

Serious damp can cost thousands to put right and is a common reason older motorhomes are scrapped. If in doubt, walk away or get a professional habitation inspection first.

Check a motorhome before you buy

Enter the registration for a free summary. Full history check £9.99.

Check a motorhome

Frequently asked questions

How do I check a motorhome for damp?+

Inspect corners, windows, roof lights, under seating and the floor for soft spots, staining and a musty smell, and use a damp meter. Readings under about 15 percent are normal; over 25 percent is a warning.

Does a history check show damp?+

No. Damp is a physical condition that only an inspection can reveal. A history check covers data records like stolen, finance and write-off.

Motorhome damp: what to look for

Where damp hides

Frequently asked questions

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