Mould Cleaning Across the UK

Professional mould cleaning for a single room usually costs around £200 to £400, depending on the size of the affected area and how far the mould has spread. Treating several rooms or a whole property typically costs £700 to £3,000. Resealing a bath or shower and painting with anti-mould paint are usually priced as extras.

Mould in the home can cause or worsen health problems, especially respiratory symptoms, asthma and allergies. People with existing lung conditions, weakened immune systems, babies, children and older people are most at risk. UK government guidance says landlords and occupants should treat damp and mould seriously and deal with the cause rather than just the visible growth.

Bleach can lighten mould on hard, non-porous surfaces such as tiles, but on plaster, paint, sealant and wood it often removes the colour without dealing with the growth in the material, so the mould comes back. Fungicidal mould treatments are more effective, and badly affected sealant or porous materials are often better replaced.

Because the moisture that caused it is still there. In most UK homes the cause is condensation from cooking, washing, drying clothes indoors and breathing, combined with poor ventilation and cold surfaces. Unless ventilation, heating or a damp problem is dealt with, mould will usually return within weeks or months of cleaning.

Condensation mould usually appears as spots on cold surfaces such as window reveals, external wall corners, behind furniture and on bathroom ceilings, and gets worse in winter. Mould caused by penetrating or rising damp tends to follow a tide mark, staining or a specific leak point and may be accompanied by damp plaster or salts. If the cause is not clear, a damp survey is worthwhile.

Landlords must keep rented homes free from serious hazards, including damp and mould, and fix problems such as leaks, faulty ventilation and inadequate heating. Under Awaab's Law, social landlords in England have had strict deadlines since 27 October 2025 to investigate and fix significant damp and mould. The government has legislated to extend Awaab's Law to private rented homes through the Renters' Rights Act, with the start date set separately. Tenants are expected to heat and ventilate reasonably.

A single room or bathroom is usually cleaned and treated in a few hours. Larger jobs with resealing and anti-mould painting may take one to two days, allowing for drying time between coats.

Keep moisture down and air moving: use extractor fans when cooking and showering, open trickle vents, dry clothes outside or in a vented area, keep the home consistently heated, leave a gap between furniture and external walls, and wipe away condensation each morning. If mould returns quickly despite this, there may be a ventilation fault or a damp problem.