Damp and mould: general advice for Portsmouth residents

Damp and mould are common problems in UK homes – especially during colder months. They can damage your property and affect your health, but the good news is that most cases can be prevented or managed with a few simple steps.

Everyday activities like cooking, showering, and drying clothes release moisture into the air. If that moisture can’t escape, it builds up—leading to condensation, damp patches, and eventually black mould.

There are three main types of damp:

• Condensation – the most common cause, from moist air hitting cold surfaces.
• Rising damp – moisture moving up from the ground through walls or floors.
• Penetrating damp – caused by leaks, faulty guttering, or broken pipes.

You might have a ventilation or damp problem if you notice:

• Condensation on windows most mornings
• A musty smell that doesn’t go away
• Black spots on walls, ceilings, or behind furniture
• Peeling wallpaper or bubbling paint

1. Open windows daily – even for 10 minutes, to let moisture out
2. Use extractor fans when cooking or showering
3. Dry clothes outside where possible – don’t dry clothes on radiators
4. Wipe condensation from windows and sills each morning
5. Leave space behind furniture to let air circulate

Extra tips that make a difference

• Keep your home heated to at least 15°C to reduce condensation
• Use pan lids when cooking and take shorter showers
• Add cold water first when running a bath to reduce steam
• Clean kitchens and bathrooms regularly to prevent mould build-up
• Don’t block trickle vents or cover air bricks

Mould can trigger allergies, asthma, and other health issues – especially for children, older adults, and people with existing conditions. It can also affect your mental wellbeing.

If you rent your home and your landlord hasn’t resolved a damp or mould issue, you may be able to get support. Visit the links below for more tailored advice:

• Advice for council tenants
• Advice for private renters
• Energy Saving Trust’s advice for homeowners

If you’re struggling to heat your home, Switched On Portsmouth offers free energy advice and support.

If you live in temporary accommodation, you can contact the team on:

• Email: Sharedmailbox.accessscheme@portsmouthcc.gov.uk
• Phone: 023 9260 6246