Protect Your London Home from Damp & Mould with These Top Tips

Protect Your London Home from Damp & Mould with These Top Tips

3rd July, 2025

London sits on a clay base called the Thames Valley Basin, a stretch of low-lying land that holds water and this means that rising damp is a very serious issue for many London properties. In this short article, we offer top tips from professional damp-proofing experts on how to protect your London home from damp and mould.

  • Add extra loft insulation – Hot air rises and when you heat your home, a large percentage of the heat leaves the building through the roof. Adding extra layers of fibreglass insulation in the loft will slow down the heat loss and this will keep the interior warmer for longer, which saves energy. If, by some chance, you do not have loft insulation, this is something to rectify as soon as possible. If you already have a single layer of fibreglass insulation, adding an extra one will help.
  • Create a strong circulation of air – Damp and mould thrive in still conditions; therefore, you should ensure that the air circulates around the building, which can be achieved by opening windows or using extractor fans. Invest in a hygrometer so that you can check humidity levels and if the air is too moist, use a dehumidifier to dry out the air. A portable dehumidifier can be moved from room to room, which can remove excess moisture.
  • Heat the whole house – Turning on the central heating in all rooms will raise the temperature by a few degrees and this will dry out the air, thus preventing damp and condensation. We understand why you would be reluctant to heat rooms that are not in use, but if you do this one time per week, this will reduce the risk of damp. Of course, this is something to do in the winter months and possibly spring and Autumn, rather than in the summer.
  • Cleaning the bathroom – Mould can easily take hold in those dark, hard-to-reach places in the bathroom; use a good chemical cleaning product and thoroughly clean every square inch of the bathroom, especially ceramic tiles. Any signs of mould and you should call London Damp Surveys and we will arrange to carry out a survey.
  • Have your home professionally inspected by London Damp Surveys – We cover all London Boroughs and our team of damp surveyors use state-of-the-art tools and equipment to help them accurately determine the presence of damp, mould, woodworm and timber rot. If your home is old and you haven’t checked for damp issues, now is the right time to arrange for a professional damp survey; you receive a detailed report within 24 hours.

Regarding damp and mould, it is a good idea to take a proactive approach by inspecting the whole house every few months and by calling London Damp Surveys on 0207 305 5997, we can set a date for one of our certified surveyors to inspect your home for mould, mildew, damp and timber rot.


Winter is not far away and a damp inspection will bring you peace of mind.

Damp Survey Costs

Transparent pricing with no hidden fees for our independent, unbiased surveys.

Level 1

Level 1

£199 + VAT

What’s included:

  • Inspection of walls
  • Inspection of floors
  • Inspection of ceilings
  • Leak inspection of drains and plumbing
  • Damp information and prevention guide
Level 2

Level 2

£299 + VAT

What’s included:

  • Everything in Level 1
  • Dry rot inspection
  • Wet rot inspection
  • Woodworm inspection
  • Damp information and prevention guide

 Survey Add Ons

Add On 1

£299 + VAT
Lab Analysis Of Plaster

Laboratory analysis Of plaster identifies hygroscopic salts such as chlorides and nitrates. which indicate whether damp is caused by rising groundwater or by plumbing leaks, This testing removes guesswork, allowing the exact source of moisture to be identified so the correct treatment is applied rather than carrying out unnecessary damp-proofing work.

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Add On 2

£299 + VAT
Mould Lab Swab Testing, qPCR on DNA

qPCR DNA mould testing detects microscopic mould spores that are invisible during a normal inspection and van remain hidden behind walls, floors. or inside building rkaterials. It identifies the exact mould species present and the contamination level, allowing hidden mould problems to be confirrned and properly treated before they affect the property or occupants’ health.

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Qualifications: All our surveyors are PCA and CSRT qualified for remedial treatments and also CSSW qualified for structural waterproofing.
Next day report: You will receive the report within 24 hours of the inspection taking place.

These are the tools we use

A damp meter

A damp meter

A damp meter is a diagnostic tool used to detect and measure moisture levels within building materials such as plaster, brick, timber, and concrete.

Borescope camera

Borescope camera

borescope camera is a small inspection camera attached to a flexible semi-rigid cable that allows you to see inside areas that are otherwise inaccessible.

Inspection Drone

Inspection Drone

A drone is a remotely operated aerial device equipped with a camera that allows visual inspection from above without the need for scaffolding or ladder.

Air Humidity Sensor

Air Humidity Sensor

Air humidity sensor measures the amount of moisture present in the air, expressed as relative humidity (RH) in percentage. It helps determine whether indoor conditions are contributing to condensation, mould growth, or damp-related issues.

Thermal Imaging Camera

Thermal Imaging Camera

A thermal imaging camera detects temperature differences on surfaces by using infrared technology to produce a heat map image. In damp investigations, it helps identify cold spots, moisture intrusion, insulation defects, thermal bridging and leaks.

Air Flow Ventilation Detector

Air Flow Ventilation Detector

An air flow ventilation detector measures the movement and volume of air passing through vents, extractor fans, and air bricks. It confirms whether ventilation systems are working properly and achieving adequate air changes within a room. Poor airflow leads to trapped moisture, high humidity, condensation on cold surfaces, and ultimately mould growth.

Mould Swab Test Kit

Mould Swab Test Kit

A mould swab test is carried out to confirm the presence of hidden mould growth and identify the specific species involved. Surface mould is not always visible, especially behind furniture, inside cavities, or within ventilation systems. Laboratory analysis of a swab sample determines whether active mould spores are present and what type they are, which helps assess potential health risks and decide the correct remediation approach rather than relying on visual assumption alone.

Plaster Salt Analysis Lab

Plaster Salt Analysis Lab

Laboratory analysis of plaster is used to identify the type of salts present within the material, typically chlorides and nitrates. The presence and concentration of these salts help determine whether the moisture source is consistent with rising damp, ground contamination, or another forms [sic] of water ingress. such as mains water leak, This removes guesswork and prevents misdiagnosis, ensuring the correct remedial treatment is specified rather than applying unnecessary or ineffective solutions.