5 Common Damp Problems London Homeowners Face in 2025

London sits on a bed of clay and this means a high level of moisture retention, which is an environment where damp can thrive. In this short blog, we take an in-depth look at some of the common damp issues that London property owners have to deal with.

1. Leaking Roof – The roof must endure the harsh UK climate and even a small leak can lead to serious damage to joists and rafters inside the roof structure. It only takes one roof tile to break or become dislodged and during heavy rainfall, water can enter the internal roof structure and if not addressed, this will lead to timber rot and possibly damp penetrating the upper ceilings and walls.
2. Rising Damp – This is caused by a compromised damp proof course that allows moisture to cross the barrier and it will draw up through the building materials with a capillary action. Older homes are more at risk of rising damp, as the DPC can degenerate over time; ground movement can cause the DPC membrane to tear and then the moisture barrier becomes ineffective. If you suspect rising damp is present in your home, don’t delay, call us at London Damp Specialists and arrange for one of our experienced surveyors to carry out a thorough inspection and provide you with a detailed survey report.
3. Condensation – Typically, condensation is worse in the winter, when temperatures fall to zero and below. Water droplets form on windows, where cold meets warm and this can be quite severe. Cavity wall insulation is a very common solution to condensation and replacing the windows and doors with aluminium double-glazed windows removes condensation permanently. Ventilation is important when condensation is present; air movement removes moisture and you can install a few extractor fans to create a positive airflow.
4. Mould & mildew – Fungi grow in still and humid conditions and you might notice a stale and musky smell that permeates through the house, which is caused by spores being released. Be observant when moving around the house, looking for any signs of fungal growth. There are various types of mould, black, green and white, with the former being the most dangerous; prolonged exposure could be fatal, so you should not take any chances when it comes to mould and mildew.
5. Woodworm – There are 2 types of beetle found in the UK and both like to burrow tiny holes in timber and lay eggs. The hatching larvae consume wood pulp and unless you take action, the cycle will continue; tell-tale signs include rows of tiny holes in wood, with fine dust piles nearby, small white eggs on the floor and the presence of dead adult beetles.

If you face any of the above problems, we are only a phone call away; Call 020 7205 4886 during business hours or leave a message on the form at the bottom of this page. 

Book an independent damp survey and we will come up with a solution and can recommend a reputable damp-proofing specialist in London that issues a 30-year guarantee on their work.