Damp and Mould: Essential Health Risks You Should Know About

Damp and Mould: Essential Health Risks You Should Know About

3rd July, 2025

Attention all London Homeowners, in this short article, we take an in-depth look at the very real health risks that are associated with damp and mould that can form in London homes. Dampness and mould thrive in humid conditions and as far as human health is concerned, the threat is mainly respiratory issues.

Mould and mildew

Mould and mildew release minute spores and if they are inhaled, this can cause respiratory infections, which can be very serious and prolonged exposure can lead to asthma and other deadly respiratory diseases. Black mould is particularly deadly and should you notice signs of mould in your home, call in London Damp Surveys to carry out a thorough inspection inside and out. One of our surveyors would contact you to arrange a date and time to carry out the inspection and you normally receive a detailed report within 24 hours of survey completion.

Skin allergies

Mould can lead to skin allergies such as eczema and skin rashes, which a damp atmosphere encourages; airborne pathogens can cause skin allergies and if not treated, can worsen over time. Skin-related conditions can come during winter or summer, as these pathogens thrive in hot and cold weather; if you notice a rash or skin irritation, see your GP and also check the home for signs of mould and mildew. Call London Damp Surveys on 0207 305 5997 during regular office hours or fill in the online form.

Preventative strategies

There are things that you can do to prevent mould and mildew, which include the following:

  • Create good ventilation – A strong airflow prevents the growth of mould and mildew.
  • Heat the whole house – Damp conditions allow mould spores to propagate and turning on the central heating at least one time per week will go a long way to preventing mould and mildew.
  • Order a damp survey – Why not get in touch with London Damp Surveys and arrange a thorough damp, mould and mildew inspection?

Rising damp

Rising damp comes from wet ground and without a suitable damp proof course, a building can be compromised by rising damp, which can be the source of the moisture that enables mould/mildew to form. You should closely inspect the exterior walls at ground level, looking for signs of moisture in brickwork, mortar and rendering.

Good health is paramount

Our living space is where we spend the majority of our time and if you are breathing in mould spores, this is a very unhealthy environment. Damp and humid conditions are ideal for the growth of mould and mildew; inspect all interior walls for damp patches, which is a sure sign that mould or mildew is present. If you think mould is present, call London Damp Surveys and arrange for one of our certified damp surveyors to book a visit and find out for sure whether or not your home has damp issues.

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.

Add to Survey

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.

Add to Survey

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.