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Damp survey

Get the facts on structural damp, the types of damp that may be present in a home and why it’s important to get a HomeBuyer Report before purchasing a house.

Damp survey

Damp is the presence of unwanted water or moisture in a building which, if it goes untreated, can cause structural damage. Damp is a major problem in the UK – creating cold and unhealthy living conditions in tens of thousands of homes.

Prevalent damp can have health implications, so if you think you may have a damp problem in your house it is important you get a surveyor to investigate and suggest the next steps to take.

The Types of Damp

Rising Damp

Causes - water from the ground moving upwards through the brickwork in the wall of a property
Identification - a ‘tide mark’ on the affected wall, damaged skirting boards and floorboards, crumbling plaster and peeling wallpaper

Rising damp can often be misdiagnosed, so ensure that you are getting independent advice from an expert damp surveyor.

Penetrating Damp (Rain Penetration)

Causes - water leaking through the walls, usually through cracks in the masonry
Identification - damp patches on walls, floors and ceilings

Penetrating damp most commonly occurs in older buildings with solid walls.


Causes - moist water vapour condensing on walls
Identification - water droplets on walls, damaged plaster and paint and decaying window frames

Damp caused by condensation is the most common type of damp occurring in homes and in the UK it is particularly a problem between October and March – ‘The Condensation Season’.

Health Risks

The most common health complaints triggered by damp are asthma and other respiratory problems, which is due to the poor indoor air quality and the emission and subsequent inhalation of the mould spores damp causes. The mould can also cause infections and immunological illnesses.

The dampness provides a thriving environment for bacteria to multiply, and with bacteria being a source for the transmission of disease this can cause health risks.

Damage to Property

The damage caused by damp is more than just aesthetic. It can lead to the structural deterioration of plaster and brickwork, rotting of timber frames and the rusting of steel and iron fasteners.

If it’s left untreated the damage can be costly to repair and due to the nature of the damage caused by damp it is likely that replastering and redecoration will be needed – a further expense. If you’re buying a property be sure to get a Chartered Surveyor to do a HomeBuyer Report (Level 2 Survey) to make you aware if there is a damp problem that would need further investigation from an industry specialist. This will give you an opportunity to reopen price negotiations with the seller and possibly reconsider your purchase.


Each type of damp has a different treatment to control the problem. To diagnose which kind of damp is affecting your home a damp survey will need to be completed. Inappropriate damp treatment can be both expensive and potentially cause further damage to buildings, so it’s important to ensure you’re getting expert advice from a professional damp surveyor.

Damp Survey

To determine the full extent of the damp and the appropriate method of treatment your Chartered Surveyor will suggest for you to get a damp survey. The knowledge a fully qualified, expert surveyor can bring to the survey can be the difference between a correct and incorrect diagnosis and treatment suggestion for the damp – saving you £100s. An approved damp surveyor will have a CRDS (Certificate in Remedial Damp Surveying) or a CSRT (Certificate in Remedial Treatment), so make sure you don’t use an under-qualified or under insured trader.

Damp can cause serious damage, to both your property and your health, so if you have any concerns about damp in your home, get an independent surveyor to advise you on whether you need a damp survey.

Damp-proofing infographic

View this helpful damp-proofing infographic, courtesy of Wise Property Care


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