Condensation: 5 Ways to Prevent Excess Moisture in your London Home

London sits on a bed of clay and ground moisture can impact a building, especially if the damp proof course is damaged in any way. The DPC is a critical component of any UK build, as this layer prevents ground moisture from attacking the structure; older London buildings would have a black bitumen DPC that is sandwiched between the first few courses of bricks and rising damp is a cause of condensation.

Here are a few effective strategies to prevent droplets of water from forming in your London home.

  1. Heat the whole house – Yes, energy is expensive, but if you turn on all the radiators in the central heating for a few hours, it will dry out the air, removing excessive moisture. Invest in a hygrometer to measure the RH (Relative Humidity) levels, which would give you a definitive answer.
  2. Avoid drying damp clothes indoors – It takes a long time to dry clothes with the eternal cloudy and damp weather we have in London, so many families dry out the garments indoors. While this does dry the clothing, the moisture is transferred to the atmosphere and without ventilation, damp and mould will follow. Condensation experts would tell you to refrain from drying wet clothing in the house.
  3. Use a portable dehumidifier – You can remove a lot of moisture from the air with a dehumidifier, which can be used in any room with excessive moisture. In the event you remove damp patches on the walls and they return, this is a sign of a leak or penetrative damp. The best solution is to book an independent damp survey from London Damp Specialists; we have been inspecting London homes for 40 years and have a great reputation within the industry.
  4. Generate a positive airflow – Ventilation is critical when it comes to moisture control; a still space with moisture is a place where mould can thrive. You could install a few extractor fans around the home and create ventilation artificially. Of course, simply opening windows will have the same effect and many London homeowners do this in the winter months to prevent droplets of water from forming on windows and walls.
  5. Bathroom & kitchen – Of course, condensation will form when you run a hot bath or take a hot shower; make sure the door is closed and open a window, which will dissipate the moisture. You should mop up condensation with a dry cloth before it can damage timber and plaster. 

If you notice a buildup of condensation, book an independent damp survey with London Damp Specialists by calling 020 7205 4886 or using the booking request form on this website. We have the know-how and the equipment to pinpoint the cause of condensation and make treatment recommendations from a leading London damp-proofing contractor.

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

Damp Meter

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.

Drone Inspection

Drone Inspection

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 Lab Swab Testing

Mould Lab Swab Testing

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.

Lab Analysis of Plaster

Lab Analysis of Plaster

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.

 

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