Top 5 Causes of Damp in London Homes and Prevention Strategies
If you are a property owner in the UK, you already know about building maintenance and one of the main issues is damp, which comes in several forms, namely rising damp, penetrating damp and condensation.
In this short blog, we present the top 5 causes of damp in London properties, along with some prevention strategies.
- Leaking roof – All it takes is a couple of roof tiles to be lifted by strong winds and you have the potential for serious damage. If water enters the internal roof structure, there will be damage to rafters and joists, therefore regular roof inspections are recommended. It is not possible to see all of a roof from ground level, hence the need for regular inspections. In the event the roofing contractor finds the source of a leak, he would fix it there and then. We recommend a roof inspection on a yearly basis, which should ensure early detection of issues.
- Exterior wall damage – Brickwork, masonry and concrete can fall prey to driving rain and gale force winds; should exterior brickwork/mortar be compromised, moisture will cause serious damage. If you are worried that your home has damp issues, call us at London Damp Specialists on 020 8528 3864 or fill in our online form and order a comprehensive damp survey in London.
- Rising damp – Every UK property should have a damp proof course (DPC) inserted just above ground level, which prevents damp from rising up the walls and causing a lot of damage. In the event the DPC is damaged or compromised, this allows moisture to climb the structure and when it reaches timber window frames, decay will be the result. DPC is installed as a matter of course when building homes in London and it can be compromised over the years. Early detection is crucial and with regular damp surveys, you can keep rising damp at bay with our rising damp treatment.
- Condensation – Condensation occurs when two different temperatures collide, typically condensation forms on single pane windows, while it can also form on walls and other materials. Many UK homeowners replace their timber frame windows with aluminium or uPVC double glazed units, as this eliminates condensation. If you have a high level of condensation, contact London Damp Specialists and we can send a technician to assess the situation. Our condensation solutions come with a full 30-year guarantee.
- Blocked guttering – What happens when guttering is blocked? A heavy bout of rain would quickly send cascades of water running down the exterior walls and that is a recipe for disaster. This is why you should regularly check the guttering on your roof, especially if there are overhanging trees, as wet leaves and small twigs can easily gather and cause a blockage. A handful of leaves could cause 1000s of pounds worth of damage, imagine that!
Rising and penetrating damp are very real threats to UK properties and if you would like to book a damp survey with London Damp Specialists, call us on 020 8528 3864 or fill out the online form on this website.
Damp Survey Costs
Transparent pricing with no hidden fees for our independent, unbiased surveys.
Level 1
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
What’s included:
- Everything in Level 1
- Dry rot inspection
- Wet rot inspection
- Woodworm inspection
- Damp information and prevention guide
Level 3 (Most Popular)
What’s included:
- Everything in Level 1 & Level 2
- Thermal Imaging
- Air humidity testing
- HD boroscope camera
- Brickwork pointing inspection
- DPC inspection
- Ventilation flow test on extractor fans
- 4K drone imagery roof, chimney stack
and guttering inspection - Structural condition inspection
- Damp information and prevention guide
Survey Add Ons
Add On 1
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.
Add On 2
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.
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.
The survey fee will be deducted from the cost of any recommended repairs.
These are the tools we use
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 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
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 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
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
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
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
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.
Contact Us
If you have some questions, please complete this form:
Book and Pay for a survey
If you are ready to book a survey and pay, please complete this form:
Contact Us
If you have some questions, please complete this form:
Book and Pay for a survey
If you are ready to book a survey and pay, please complete this form:
Contact Us
If you have some questions, please complete this form:
Book and Pay for a survey
If you are ready to book a survey and pay, please complete this form: