How much does it cost to fix damp and mould?
Most damp is condensation, penetrating damp or a leak, and the fix depends on the cause. Here is what the work involves and how to see a typical range.
Tell us about your home and we'll show the typical UK price range for this job, what's involved and what to ask, in about 20 seconds. The job is already filled in: change anything that's different.
What the job involves
- Finding the cause first: condensation, a leak, rain getting in, or (less often) rising damp.
- Fixing the cause: ventilation, extractor fans, gutters, pointing, render or a leak.
- Treating mould and making good the plaster and decoration afterwards.
What moves the price
- The cause: ventilation fixes cost far less than a damp proof course.
- How much plaster needs replacing.
- An independent survey first, which avoids paying for the wrong treatment.
Before you say yes
- An independent diagnosis from someone not selling the treatment.
- An insurance backed guarantee for any treatment.
Questions people ask
Is black mould on walls always damp?
Usually it is condensation: warm moist air meeting a cold wall. Better ventilation, heating and extractor fans often fix it without any damp proofing.
Ready for quotes?
The surest price is a real quote. Post the job once, free, and up to three local trades text or ring you back, usually within a few hours.
Post the job freeRelated guides
General guidance from LocalWins, last checked October 2026. It is not legal advice or a planning decision, and every home is different: confirm anything important with your council or a qualified professional.