Mould and Your Health: What Government Guidance Says

Article

What you are seeing

The signs are visible mould, a musty smell, condensation on windows and cold walls, peeling wallpaper or stained plaster. GOV.UK guidance notes that damp and mould can produce allergens, irritants, mould spores and other toxins, and that even where no mould shows, dampness alone can increase the risk of health problems. Excess moisture can also encourage certain species of house dust mite, bacteria and viruses. The same guidance says the more serious the problem and the longer it is left, the worse the effects are likely to be.

It describes the main effects like this:

• Airways and lungs: cough, wheeze and shortness of breath, a higher risk of airway infections, and the development or worsening of allergic conditions such as rhinitis and asthma.
• Eyes and skin: irritation of the eyes, and eczema or itchy skin rashes in some people.
• Mental health: worry about health, unpleasant living conditions and damaged belongings can all take a toll.

The guidance says people most at risk include those with a pre-existing condition such as allergies, asthma or other lung disease, people with weakened immune systems, pregnant women, children and young people, and older people. NICE guidance on indoor air quality lists a similar group. This is general information, not medical advice, and it is not a substitute for talking to a healthcare professional.

Rule these out first, cheapest first

1. Step 1, free: look and make a note. Photograph the mould, note where it is and roughly how big, and look behind furniture and inside cupboards on outside walls. GOV.UK guidance suggests photographing the affected area before cleaning so you can see whether it returns.
2. Step 2, free: speak to a GP if anyone has symptoms. Government guidance advises anyone concerned about symptoms to consult a healthcare professional. Mention it especially for babies, older relatives and anyone with asthma or a weakened immune system.
3. Step 3, low cost: clean a small patch safely. GOV.UK guidance says mould and mildew products should be used in preference to bleach, and that the person cleaning should wear a mask, gloves and goggles, keep the door to other rooms shut and leave the window open. Larger areas should be left to qualified professionals. Our guide to cleaning mould safely covers the method.
4. Step 4, free: cut the moisture you add. Cover pans, run the extractor fan when cooking and bathing, close the door of the room while you do, leave a gap between furniture and outside walls, dry washing outdoors if you can, and open windows now and then. These are the everyday habits the guidance lists.
5. Step 5, trades: have the cause diagnosed. A leaking gutter, failed seal, cracked render or a bridged damp proof course will keep feeding mould whatever you wipe off. The guidance says not to assume you can diagnose every problem yourself, and that surface cleaning will not stop damp and mould from reappearing. Start with our guide to rising, penetrating and condensation damp.
6. Step 6, system: a dehumidifier comes last. If the cause is condensation across the home and the checks above are done, controlling humidity is the long-term step.

The Ashford factor

Winters around Ashford are mild and often wet, so windows stay shut and washing ends up indoors. GOV.UK guidance lists poor ventilation, poor insulation and homes where residents feel unable to open windows among the conditions that raise the risk, and those conditions can turn up in older village homes and in more airtight newer ones alike. Look at how the room behaves, not the postcode. If you are in Great Chart, Kennington or Wye, the same order of checks applies.

When a dehumidifier is not the answer

A dehumidifier does not treat symptoms, does not clean mould that is already growing and does nothing about a leak, a failed seal or damp rising from the ground. Clean the mould off and fix any leak first. If your home has no loft, a Dryzen system is not an option because the unit is mounted there, and a rented home is not suitable unless the landlord authorises the changes.

Where Dryzen fits

If the cause turns out to be condensation, a Dryzen system helps stop the conditions mould and dust mites need. It is a loft-mounted dehumidifier with insulated ductwork to the central area or stairway. Each unit covers up to 150 square metres, extracts about 12 litres a day and costs about 20 pounds a year to run. It has an activated carbon filter, and a smart app with temperature and humidity monitoring is included. The warranty is 10 years on parts and labour and 1 year on the compressor.

If you would like a straight answer for your own home, book the free survey. We measure the humidity, check the loft and tell you plainly whether a system would help.

Quick questions

Can damp affect my health if I cannot see any mould?

GOV.UK guidance says that even if visible mould is not present, dampness alone can increase the risk of health problems, because excess moisture can promote mould, certain house dust mites, bacteria and viruses.

Who is most at risk from damp and mould?

GOV.UK guidance says anyone can be affected, but people with conditions such as asthma, allergies or other lung disease, people with weakened immune systems, pregnant women, children and older people are at greater risk.

Should I see a doctor about mould in my home?

GOV.UK guidance advises anyone concerned about symptoms they are experiencing to consult a healthcare professional. A dehumidifier is not a treatment, so speak to a GP about symptoms and deal with the damp separately.

Sources: GOV.UK: Understanding and addressing the health risks of damp and mould in the home; NICE: Indoor air quality at home (NG149)

Last reviewed 2026-10-28. General guidance only; this is not a survey of your home or medical advice.