If your home often feels clammy, stuffy, or damp, you’re not alone. High humidity is a common problem in UK homes, especially during colder months when windows tend to stay closed for longer periods, and ventilation is poor.

Humidity can lead to condensation and then possibly mould, which can have adverse health impacts as we’ve mentioned in previous blogs. Also for Landlords there are legal implications of condensation and mould which should be considered, particularly with Awaab’s law taking effect this month.

What Causes Excess Humidity Indoors?

1. Everyday activities – Cooking, showering, and drying clothes indoors can release litres of water vapour into the air as part of this daily activity.
2. Poor ventilation – Without enough turnover of airflow, between outside and inside the property, moisture becomes trapped inside.
3. Leaky pipes or roofs – Even small leaks can raise humidity and cause hidden damp patches.
4. Cold surfaces – Whilst a cold surface doesn’t cause humidity in itself, when warm moist air hits a cold wall or window, condensation forms. This condensation can then add to the ongoing humidity problem.

How to Fix High Humidity

• Increase ventilation by opening trickle vents and using extractor fans.
• Avoid drying laundry indoors. Solutions to this could be either to use a tumble drier, or to deploy a dehumidifier near to the source of moisture (hanging clothes).
• Check for leaks around windows, radiators, or pipework.
• Hire a dehumidifier to quickly extract excess moisture and restore healthy indoor air levels. Over the colder seasons, an industrial dehumidifier may be required in order to remove humidity fast.

Ideal Humidity Level

Aim for 40–60% relative humidity. Above 60% encourages mould and dust mites; below 40% can cause dryness and irritation.

Hiring a dehumidifier from Dehumidifier Rental is a simple, cost-effective way to bring humidity back under control fast — without committing to buying equipment you might only need seasonally.

We operate in London and the South East of England and are happy to advise what equipment may be suitable. Call us on 020 7760 7660, or email at help@dehumidifier-rental.co.uk Just let us know how many rooms are affected, and their approximate size, and we will give you a quote for suitable equipment.

• Awaab’s Law: What Landlords Need to Know About Damp and Mould Compliance
• Do Dehumidifiers Use a Lot of Electricity? (Energy Cost Breakdown)