Attention London Homeowners: Rising Damp, Penetrating Damp and Condensation

Attention London Homeowners: Rising Damp, Penetrating Damp and Condensation

3rd July, 2025

The wet climate we experience in northern Europe doesn’t seem to be getting any better, days pass without the Sun peeking through a thick wall of cloud, add to that the record high rainfall in the past 3 years and you have the perfect conditions for damp to attack your home.

In this short article, we take a look at various forms of damp and mould that can damage your London home.

  • Rising damp – Moisture from the ground can destroy a building if there are no damp-proofing solutions in place. Every single house in the UK would be protected by a damp proof course; typically a bitumen membrane that is laid on top of a course of bricks at ground level; when the DPC is damaged, moisture rises up the walls in a capillary action, causing a lot of damage to building materials. There are chemical solutions when traditional damp proof course is impractical; special foam is injected into the walls near ground level and this provides an effective barrier to ground moisture.
  • Penetrating damp – Damp can come from the roof, the walls or the ground; crumbling brickwork and mortar lead to water penetration, with driving rain making it worse. Once moisture gets into the exterior walls, damage is inevitable and the longer it goes unaddressed, the costlier the repairs are. One of the busiest service industries, damp proofing in London is the best solution for property owners with damp issues. At London Damp Surveys, we have a team of fully qualified damp surveyors, covering every London borough, give us a call on 0207 305 5997 and we will arrange for one of our surveyors to inspect your home. It could be a leaking roof that leads to timber decay and in worst-case scenarios, joists and rafters need to be replaced. Timber should be coated with several layers of protection; remove all timber that has been compromised and be proactive with regular inspections.
  • Condensation – When there is excessive moisture in the air, condensation will form, especially if there is no ventilation; this could be caused by a breach of exterior walls or even rising damp. It is important to find the underlying cause of the water build-up and carry out damp proofing as soon as possible. Improving the ventilation will have a positive effect on excessive moisture, open a few windows, turn on extractor fans and heat the space after the air is circulated. It is important to dry out the air in a poorly ventilated room.
  • Mould & mildew – Mould grows in the right conditions, a damp and humid atmosphere with no ventilation would quickly produce mould, releasing tiny spores that can cause respiratory issues. If you see signs of mould forming in your home, you need a professional damp assessment from London Damp Surveyors; using cutting-edge tech such as thermal imagery and moisture meters, our trained damp inspectors can pinpoint the cause and recommend remedial work.

As we move into the summer months, this is the right time to have your home surveyed for damp and mould by a leading London company. You will receive a detailed written report when the survey is completed.

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.