Which Areas of the UK Struggle the Most with Mould?

Black spots appearing around windows and doors or creeping across the wall. A musty smell that refuses to disappear. These are the tell-tale signs of damp and mould that appear in so many houses – and keep coming back. A combination of wetter weather and older, ‘leaky’ housing stock exacerbate the issue in the UK, creating environments where mould can thrive. Find out if you’re in one of the hardest-hit areas and what to do if you spot small patches to prevent it from becoming a bigger issue.

1. Yorkshire and the Humber

Yorkshire and the Humber regularly experiences conditions that encourage mould growth. The region has a micro-climate with cooler temperatures and periods of heavy rainfall. Combine that with the large number of older properties, particularly Victorian terraces and pre-war housing, and you have a recipe for mould.

Older homes often feature solid walls that lose heat more quickly than modern constructions. This creates cold surfaces where condensation can collect, encouraging moisture to sit within the home. If you live in a traditional terrace in Leeds, Bradford or Hull, you might notice mould appearing behind wardrobes placed against external walls or around window frames during winter.

2. London

London may not experience the highest rainfall totals in the UK, but it still faces mould challenges. High population density means high-density housing and smaller living spaces, both of which present ventilation challenges. In addition, many London flats contain limited storage, which encourages residents to place furniture tightly against walls or dry clothes indoors. A family drying washing in a compact flat can release much moisture into the air over a single day.

Restricted airflow work creates the perfect environment for mould spores. In badly affected rooms, you could benefit from investing in a single room mechanical ventilation with heat recovery (SRHR) which ensures a supply of fresh air. Even simple changes, such as using extractor fans consistently and ventilating rooms after showering, can make a noticeable difference. Keeping furniture a few centimetres away from external walls also allows air to circulate better, helping surfaces stay drier and easier to maintain.

3. Coastal areas

Homes near the coast often contend with higher humidity levels throughout the year. Sea air carries moisture inland and strong winds can drive rain against external walls, increasing the risk of penetrating damp if maintenance issues develop – as they so frequently do in older, stone-walled properties.

Homes in towns such as Blackpool, Scarborough, Brighton and Penzance frequently face this challenge. Even when indoor temperatures feel comfortable, moisture levels can remain high. Salt-laden air can also accelerate wear on windows, seals and exterior materials, allowing more water to permeate these already vulnerable spots. Regularly checking guttering, roof tiles, walls and window seals helps you identify minor defects before water finds its way indoors and creates ideal conditions for mould.

4. High-rainfall areas

Areas that receive substantial rainfall face the greatest long-term mould risks. Much of western Britain, including parts of Cumbria, Wales, western Scotland and the Lake District, experiences significantly higher rainfall than most of the east.

Persistent wet weather increases pressure on roofs, brickwork and drainage systems, and if a gutter overflows repeatedly or rainwater penetrates damaged pointing, moisture builds up within walls over time. Scheduling routine inspections, and extra checks after particularly wet seasons, can help you identify problems before they become costly repairs.

5. How to treat mould in your home

The most effective mould treatment starts with identifying the source of the moisture. Government guidance recommends tackling the root issue, whether that involves condensation, inadequate ventilation or a building defect. Cleaning visible mould without addressing the underlying cause usually leads to its return.

Start by checking whether the affected area relates to condensation or a leak. A persistent damp patch in one location often suggests water ingress, while mould around windows and external wall corners commonly points to condensation. After resolving the cause, clean smaller affected areas with an appropriate mould-removal product and dry the surface thoroughly.

For homes that struggle with ongoing condensation, improved ventilation often delivers the greatest benefit. Combined with consistent heating, working extractor fans and sensible moisture management habits, these advanced ventilation systems can help create a healthier and more comfortable living environment throughout the year.