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How to Stop Damp in Your House: 9 Expert Tips
Updated 3 November 2026. Reviewed by Michael Young, Head Contractor at Advanced Damp (CSSW and FODCS).
Key Takeaways
- Most household damp is condensation, which you can reduce with better ventilation, steady heating and less moisture in the air.
- Outside maintenance, such as clear gutters and correct ground levels, prevents a lot of penetrating and rising damp.
- Prevention tips will not fix structural damp. Damp at low level, after rain or that keeps returning needs diagnosing.
Damp in a home causes peeling paint, mould, musty smells and, left long enough, damage to plaster and timber. The good news is that a lot of it can be prevented. This guide sets out nine practical steps that make a real difference, and explains when damp is beyond what prevention can fix.
First, Know Which Type of Damp You Are Preventing
- Condensation: moisture from inside the home settling on cold surfaces. The most common type, and the one these tips help with most.
- Penetrating damp: water getting in through walls, roofs or windows. Prevented by maintaining the outside of the building.
- Rising damp: ground moisture rising through walls with no working damp proof course. Needs specialist treatment.
Not sure which you have? Try our damp checker.
9 Ways to Prevent Damp
1. Ventilate Every Day
Open windows for a short time each day, even in winter, to let moist air out. Keep trickle vents in windows open. See does opening windows reduce damp.
2. Use Extractor Fans Properly
Run the extractor fan whenever you cook or shower, and leave it on for 15 to 20 minutes afterwards. Clean the fan and check it actually pulls air. Our guide to stopping damp in a bathroom has more detail.
3. Dry Clothes Outside or in a Vented Dryer
A single load of washing dried indoors can release several litres of water into the air. Dry outside where you can. If you must dry indoors, use one room with the door shut, the window open and the fan on.
4. Keep the Home Evenly Heated
Cold rooms attract condensation. A low, steady background heat throughout the home is better than heating some rooms hard and leaving others cold.
5. Use a Dehumidifier Where Needed
A dehumidifier helps in rooms that stay humid, such as basements, bedrooms and rooms used for drying washing. It manages the symptom rather than the cause. See will a dehumidifier remove damp.
6. Wipe Condensation From Windows
Wipe windows and sills dry each morning so water does not soak into frames and plaster. Our guide to stopping condensation on windows covers this.
7. Give Furniture Room to Breathe
Leave a gap between wardrobes, beds and sofas and external walls, so air can circulate and the wall stays warmer.
8. Maintain the Outside of the Property
Clear gutters and downpipes, fix cracked render and defective pointing, replace slipped roof tiles, and keep window seals in good condition. Keep paths, patios and flower beds at least 150mm below the damp proof course, and keep air bricks clear.
9. Keep Seals and Grout in Good Condition
Re-grout tiles and replace failed silicone around baths, showers and sinks so water does not get behind them.
Get Rid of a Damp Smell
A musty smell is a sign of damp or mould somewhere in the room. Ventilate, find and clean any mould, and check behind furniture and inside cupboards on external walls. If the smell persists, there is likely a hidden source. See what dampness smells like.
When Prevention Is Not Enough
Call a specialist if damp sits at low level on ground floor walls, appears after heavy rain, keeps returning despite good ventilation, or comes with rotten skirting, floorboards or a strong musty smell. These point to rising damp, penetrating damp or a hidden leak, which need diagnosing and repairing.
Advanced Damp is a Member of the Federation of Damp and our surveyors are FODCS certified. Book a damp survey and we will find the cause and tell you what is needed.
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Frequently asked questions
What is the most effective way to prevent damp?
Keep moisture out and let it escape. Fix leaking gutters and downpipes, keep ground levels below your damp proof course, keep air bricks clear, and extract moisture from kitchens and bathrooms at source. Most damp problems in occupied homes come back to one of these four things.
Do dehumidifiers prevent damp?
A dehumidifier reduces condensation by lowering the moisture in the air, but it will not stop rising or penetrating damp. It is useful as a short term measure while the real cause is identified and fixed.
How often should I check my home for damp?
Walk round the outside of the property at least twice a year, ideally before and after winter, checking gutters, pointing, render and ground levels. Inside, look for tide marks, flaking paint and mould in corners and behind furniture.
How do I stop damp in my house in winter?
Keep the home evenly heated, use extractor fans when cooking and bathing, open windows briefly each day, and avoid drying clothes on radiators. Most winter damp is condensation, which these steps reduce.
When should I call a damp specialist?
If damp keeps returning, appears at low level on walls, follows heavy rain, or comes with rotten timber or a persistent musty smell, the cause is likely more than condensation and needs a survey.
Reviewed by Michael Young, Head Contractor at Advanced Damp (CSSW and FODCS). Last reviewed November 2026.
Related Case Studies
Our recent work includes lower ground flat, Kings Cross WC1X; first floor flat, Brixton SW9 and lower ground floor, Blackheath SE3. Each case study sets out what the survey found and how the problem was fixed.
Lower ground flat, Kings Cross WC1X
Rising damp returned around an arch and back door despite an earlier DPC. Treated with a new DPC, waterproof render and skim ahead of a sale.
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First floor flat, Brixton SW9
Thermal imaging found cold external walls behind recurring black mould. Isotherm insulation and electrical works followed.
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Lower ground floor, Blackheath SE3
Lateral damp from poor drainage and bridging. ACO drain installed and the reception room walls treated.
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Sam Fitzgerald is the founder of Advanced Damp and a working damp and structural waterproofing surveyor diagnosing and treating moisture problems in residential and commercial properties across London and the South East. He is FODCS certified (a Federation of Damp Certified Surveyor) and a member of the Federation of Damp. His hands-on work covers rising damp, penetrating damp, condensation, basement waterproofing to BS 8102, and thermal imaging surveys, and he has personally completed over 400 damp surveys across properties of every type and age. Everything he writes draws directly from jobs he has carried out. He does not write about treatments, products or causes he has not dealt with first-hand in the field.
