Preparing your London Home for Winter – Damp Inspection Guide

Preparing your London Home for Winter – Damp Inspection Guide

3rd July, 2025

We all know about the great British climate and how unpredictable the weather can be; rain, rain and more rain seems to be the norm these days and with London being in the Thames Valley Basin, the ground remains wet in many areas. We are currently enjoying the summer, but it won’t be long before the leaves start to fall from the trees and we brace ourselves for the coming cold season.

In this short article, we offer a few tips on preparing your London home for winter, which is the season for damp and mould.

  • Roof inspection – Of course, the roof is the most important component of any building, as it keeps the harsh elements at bay and a leak would lead to water entering the internal roof structure. At London Damp Surveys, autumn is a busy time as many homeowners request damp inspections; our damp survey includes a thorough roof inspection, looking for signs of damp, mould and timber rot. All it takes is a couple of roof tiles to be lifted by gale-force winds and a bout of heavy rain to cause serious damage to joists and rafters.
  • Inspect exterior walls – Start at ground level, looking for crumbling mortar and moss growth; your home should be protected by a damp proof course, which is set between lower courses of brickwork. This prevents moisture rising from the ground and should the DPC be compromised in any way, trouble won’t be far away. You can use a screwdriver to poke masonry and mortar to check if damp is present. Rising damp can cause serious damage to a building and timely intervention is crucial, any signs of damage should be investigated.
  • Checking the interior walls and ceilings – Look for damp patches, tidal marks and stains on walls and ceilings, which are sure signs of damp; peeling wallpaper and bubbling paint are bad news; damp walls need to be investigated and we at London Damp Surveys have a team of fully qualified damp surveyors who are ready to inspect your London home and our inspectors are qualified and use cutting-edge tools and equipment to accurately assess London properties for damp, mould and timber rot.
  • Condensation – Excess moisture turns to droplets that form on cold surfaces, which can damage materials and if your home suffers from condensation, give us a call on 0207 305 5997 or fill in the online form and arrange for one of our certified damp surveyors to inspect the property. Adequate ventilation can effectively reduce and prevent condensation, which can come from opening a few windows or correct use of extractor fans. A dry cloth can be used to wipe up any condensation before it can do any damage and we recommend keeping a dry cloth in any room where condensation is an issue.

If you would like the peace of mind that comes with a professional damp survey, call London Damp Surveys and arrange for one of our surveyors to inspect your property.

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.