Is rising damp dangerous?
Updated June 2026
Rising damp won’t harm you overnight, but it isn’t something to ignore. Left untreated it damages the building, rotting timber and ruining plaster, and the damp conditions it creates encourage mould and woodworm, which do affect health and value. The danger is gradual rather than dramatic, which is exactly why people leave it too long.
What rising damp does to your home
Over months and years, untreated rising damp causes:
- Rotting timber — skirting boards, floor joists and door frames go soft and decay
- Ruined plaster and decoration — salts and moisture blow the plaster and wreck paint
- Mould and mustiness — persistent damp feeds mould growth
- Woodworm and rot — damp timber attracts wood-boring beetles and wet or dry rot
Caught early it’s one wall and a straightforward fix. Left for a year or two it spreads into the floor, the skirting and the room, and the repair grows with it.
Is rising damp a health risk?
Rising damp itself isn’t toxic, but the conditions it creates can affect health. Damp and the mould that comes with it are linked to breathing problems, allergies and worsened asthma, particularly for children, older people and anyone with a respiratory condition. So while the wall won’t make you ill directly, a persistently damp, mouldy room is worth resolving for health as well as the building.
The other cost: your property’s value
Rising damp gets flagged on mortgage and homebuyer surveys, puts buyers off, and can hold up a sale. Dealing with it properly, with a guarantee on the work, protects both the building and what it’s worth.
What to do about it
If you think you have rising damp, get it diagnosed before it spreads. Our rising damp guide explains the signs and treatment, and the rising damp treatment page covers how it’s fixed. The sooner it’s caught, the smaller the job.
Frequently asked questions
How quickly does rising damp get worse?
It’s gradual, but it doesn’t stop on its own. The longer it’s left, the further it spreads into plaster, skirting and floor timbers, and the bigger the repair.
Can I live in a house with rising damp?
You can, but it’s worth treating for the sake of the building and the air quality, especially if anyone in the home has breathing problems.
Is rising damp worse than condensation or penetrating damp?
Not necessarily worse, just different. All three damage a home if ignored. The important thing is diagnosing which you have and fixing the cause.
Worried about rising damp in your Brighton or Hove home? Book a free survey and catch it early.