What Causes Mould Behind Cupboards, and What Can You Do About it?

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What Causes Mould Behind Cupboards, and What Can You Do About it?

10th February, 2023

Most people are aware of the issue of damp and mould in the home, but many people do not understand how to deal with the problem. While it may seem like an annoyance, mould is actually dangerous. Mould emits pathogenic mycotoxins that can cause serious health problems for a lot of people. To understand how to deal with mould, we need to understand what causes it.

The Appearance of Mould in the Home

Mould is a fungus that emits invisible spores. While you might want to eliminate these spores to ensure mould does not colonise the home, it is not always that easy. Fungi are a part of our ecosystems, so we cannot eliminate them. This is especially true when you consider the fact that mould spores are microscopic, and so we cannot see the mould until it colonises a home.

A mould colony is dark green or black. It is slimy, and it can get messy when you try to clean it. Removing mould from the windows, doors, walls and floor is relatively easy. All you need is some water, bleach, vinegar and a sponge. However, the mould behind a cupboard is a lot trickier. This is because you might not notice it until the colony has started growing, and you would need to do a lot of work to get rid of it. So, what causes mould behind cupboards?

It is Mainly About Air Circulation and Damp in the Home

While it is impossible to eliminate mould and its spores, it is possible to prevent it. You do this by controlling indoor moisture and dampness in a house. The reason it works is that mould thrives in homes that have uncontrolled condensation, high humidity and water leaks or penetration into the home.

The lack of circulation, as is often the case behind many cupboards, allows mould spores to sit for long periods until they grow into mould. This lack of circulation stems from the fact that the area behind the cupboard will be blocked off by the wall behind it and the boards used to build it. The fact that cupboards are also meant to sit for long periods means many people do not clean behind them.

The cause of mould in your bathroom or kitchen is a lack of ventilation when cooking or showering. This lack of ventilation leads to high moisture and humidity levels which provide a conducive environment for mould to thrive. Apart from behind the cupboard in these areas, you might also find mould on the windowsills and behind appliances as the mould spores start to spread inside the home.

Plumbing Issues Causing Mould

Most of your plumbing is installed in the walls and your cupboards are likely installed in front of these walls. If a leak happens inside such walls, the wall will get damp and mould might start growing on it. You might not notice this because the damp area and thus the mould will be hidden by the cupboard.

One way you could tell that there is a leak even if it is hidden is by noticing that the floor feels or looks damp in an area that is away from obvious water sources. If such an issue is realised beside or in front of a cupboard, it is a good idea to check behind the cupboard to see if you have a leak there.

You can also commission additional London damp surveys to find out the cause of the damp floor. Such surveys can even reveal mould in areas other than behind your cupboards.

Dealing with Mould Behind the Cupboard

Before doing anything, it is a good idea to call a damp specialist London to find out if a damp issue is causing the mould in the home. They will advise you on factors like penetrating and rising damp so that you know the next steps to take if there is an issue.

The second thing is dealing with mould. This includes cleaning the area with bleach, water and a detergent. Scrub the area until it is clean and do not be afraid to clean it as many times as you need to until all the mould is gone. Take care not to destroy the paint on the wall. Once you are done cleaning, dry the area with a dry cloth and leave it like that for a bit to ensure it is completely dry.

Sort Out Ventilation Issues

Because poor ventilation is a precursor to mould behind your cupboard and in other areas of the home, you need to ensure that areas likely to have high humidity are properly ventilated. These include the kitchen and the bathroom.

You can install a range hood in the kitchen to remove moisture while you cook. You can also open the doors and windows while you cook or use the shower to let the damp out. If you have to, you can use a fan or install an air conditioning unit in the home. The air conditioning unit, in addition to cleaning the air and removing humidity, can also filter the air and remove mould spores to stop it from growing in the home.

Deal with Damp Issues

Next, you have to deal with the damp issues that are creating a conducive environment for the mould to thrive. This includes finding all potential areas damp could be getting into the home. One common issue is penetrating damp that gets into the home through the walls. Get a property survey so a professional can assess the damage and tell you the next steps.

Also, check that your gutters and downpipes are in good condition. If they are blocked, they could cause water to cascade down the walls instead of being led away from the house. This can cause the walls to be saturated with water leading to damp that causes mould.

Having mould behind your cupboards or anywhere else in the house is not a good thing because mould can be incredibly dangerous. Knowing how to remove the mould and dealing with what made it grow in the first place is critical to prevent a recurrence.

Qualification list

PCA-Certificated Surveying

 

  • CSDB (Certificated Surveyor of Dampness in Buildings): This certification ensures your damp diagnosis is carried out to a recognised industry standard. 
  • CSTDB (Certificated Surveyor of Timber and Dampness in Buildings): This means we can assess timber decay, wet rot, dry rot and wood-boring insect activity in the same visit, giving you a complete picture of your property’s condition. 
  • CSSW (Certificated Surveyor in Structural Waterproofing): Where basement or below-ground waterproofing is involved, this certification ensures that any tanking or structural waterproofing solution we recommend is specified the first time correctly.

CSCS

 

  • CSCS (Construction Skills Certification Scheme): Our experts carry a CSCS card, which confirms they’re authorised and trained to work safely on-site, giving you confidence that the team in your home meets recognised industry safety standards.

Asbestos awareness

 

  • Asbestos awareness: Older properties may contain asbestos, particularly in areas where damp and timber work are common. Our team holds UKATA-accredited Asbestos Awareness training as standard and where a job risks disturbing such materials, our experts are more than qualified to manage the work safely and in full compliance with UK regulations.

30-Year Warranty + 10-Year Insurance-Backed Guarantee

 

Your damp repair is protected for decades. 

  • 30-Year Warranty: All remediation work is covered by a 30-year workmanship warranty, protecting your property against recurrence of the treated issue.

  • 10-Year Insurance-Backed Guarantee (IBG): Your guarantee is insurance-backed for 10 years through Quality Assured National Warranties (QANW), so your cover remains valid even if we’re unable to fulfil it ourselves.

  • 24-Hour Report Delivery: Comprehensive digital survey reports are typically issued within 24 hours of the inspection’s completion.

Our Equipment

Damp Meter

Purpose:

Takes comparative surface moisture readings across accessible walls, floors, ceilings and building joinery.

Common Uses / Notes:

Maps surface moisture profiles to help identify rising damp, penetrating damp, condensation, or active plumbing leaks.

Deep-Penetration Damp Meter

Purpose:

Detects moisture changes deep below the immediate surface of structural materials without destruction.

Common Uses / Notes:

Evaluates dampness within wall cores, beneath floorboards, inside subfloors and behind finishes without removing plaster.

Non-Invasive Moisture Scanner

Purpose:

Scans surface planes non-invasively without inserting pins or probes into decorated finishes.

Common Uses / Notes:

Checks decorated walls, tiled surfaces and delicate floor coverings to trace sub-surface water migration non-destructively.

HD Borescope Inspection Camera

Purpose:

Provides high-definition visual examination inside enclosed, narrow, or inaccessible building cavities.

Common Uses / Notes:

Inspects subfloor voids, wall cavities, dry lining and enclosed pipework to locate leaks and defects with minimal disruption.

4K Inspection Drone

Purpose:

Captures high-resolution imagery and video of high-level external structures and rooflines.

Common Uses / Notes:

Inspects roof tiles, chimney stacks, lead flashing, parapet walls, valleys and gutters to locate water ingress sources.

Air Humidity Sensor

Purpose:

Measures ambient air temperature and relative humidity (%RH) levels within living areas.

Common Uses / Notes:

Determines whether atmospheric moisture, cold bridging, or insufficient ventilation supports surface condensation and mould growth.

Thermal Imaging Camera

Purpose:

Visualises surface temperature differentials across walls, ceilings and floors.

Common Uses / Notes:

Detects cold spots, missing insulation, thermal bridges, evaporative cooling zones and concealed water leaks.

Airflow & Ventilation Detector

Purpose:

Measures volumetric air extraction performance (L/s or m3/h) of mechanical extractor fans.

Common Uses / Notes:

Tests kitchen, bathroom and utility fans to verify compliance with UK Building Regulations Part F and control condensation.

Gas Screening Instrument

Purpose:

Screens indoor environments for sewer gas intrusion, combustible gases and combustion concerns.

Common Uses / Notes:

Traces foul odours, soil stack leaks and sewer gases (H2S, NH3, CH4, CO, O2). Does not replace Gas Safe registered safety checks.

Chemical Vapour Detector

Purpose:

Screens air for Volatile Organic Compounds (TVOC/VOC) and chemical substances like formaldehyde (HCHO).

Common Uses / Notes:

Investigates unexplained chemical odours, building material off-gassing, post-flood air safety and indoor air quality.

Airborne Particle Detector

Purpose:

Measures airborne particulate concentrations across precise micron size ranges (PM1.0, PM2.5, PM10).

Common Uses / Notes:

Assesses fine dust, smoke, airborne matter and environmental air quality following water damage or mould outbreaks.

Electrical Socket & RCD Tester

Purpose:

Provides basic safety and protective circuit screening in areas affected by dampness.

Common Uses / Notes:

Identifies socket wiring faults, tests RCD trip functions and checks AC voltage in wet areas. Does not replace an EICR.

Survey Levels & Package Specifications

Level 1

Standard Damp Survey

Standard price: £299 + VAT

Promotional Price: £199 + VAT (Limited Time Offer)

Offer ends in--Days--Hours--Mins--Secs

The Level 1 Damp Survey is a basic damp inspection designed to check the main accessible areas of the property for damp, leaks
and visible moisture-related issues.

Equipment Included

  • Damp meter

What Is Included

  • Inspection of walls
  • Inspection of floors
  • Inspection of ceilings
  • Leak inspection of drains and plumbing
  • Damp information and prevention guide

Best For

This survey is best for customers who need a basic damp check where only a damp meter is used. It is most suitable for simple

damp concerns, such as suspected rising damp, visible damp patches, minor moisture concerns or a general check of accessible
areas.

The Level 1 Damp Survey is suitable where the customer wants a straightforward inspection of walls, floors, ceilings, drains and
plumbing without the use of advanced survey equipment.

Level 2

Detailed Damp & Timber Survey

Standard price: £399 + VAT

Promotional Price: £299 + VAT (Limited Time Offer)

Offer ends in--Days--Hours--Mins--Secs

The Level 2 Damp Survey includes everything in the Level 1 survey, with additional timber decay inspections and deeper
moisture testing.

Equipment Included

  • Damp meter
  • Deep-penetration damp meter for all building materials
  • Non-invasive moisture detection equipment

What Is Included

  • Inspection of walls
  • Inspection of floors
  • Inspection of ceilings
  • Leak inspection of drains and plumbing
  • Dry rot inspection
  • Wet rot inspection
  • Woodworm inspection
  • Deep moisture detection in building materials
  • Non-invasive moisture testing under floorboards and subfloors where accessible
  • Damp information and prevention guide

Best For

This survey is best for customers who need a damp and timber inspection. It is suitable where there may be concerns about damp,

wood rot, dry rot, wet rot, woodworm or moisture hidden behind building materials.

The Level 2 Damp Survey uses equipment that can read deeper into building materials, including areas such as subfloors, under
floorboards, behind panelling and other accessible hidden areas. This allows us to get a better understanding of whether there may
be hidden damp within the property without dismantling or damaging materials.

This survey is very suitable for home buyers and sellers who want a more detailed damp inspection before purchasing or selling a
property.

Specialised Laboratory Diagnostic Add-Ons

Add-On 1

Laboratory Analysis of Plaster Samples

Price £299 + VAT

Small plaster samples are carefully taken from affected walls and submitted to an independent laboratory for salt analysis. The laboratory tests for the presence and precise concentration of hygroscopic salts, including nitrates and chlorides.

Diagnostic Value: Soluble ground salts are drawn up through masonry during rising damp and remain in plaster permanently. Salt analysis scientifically differentiates true rising damp from condensation or historic leak contamination.

Note: Plaster sampling requires minor material removal and is our only add-on involving minor invasive work.

Add-On 2

Mould Laboratory Testing & qPCR DNA Analysis

Price £299 + VAT

Surface swab or lift samples are submitted to an accredited laboratory for advanced qPCR DNA analysis.

Diagnostic Value: Accurately identifies exact mould species, measures contamination concentrations and detects hidden fungal growth inside cupboards or behind dry lining. Delivers impartial scientific evidence to guide safe environmental remediation.

Add-On 3

Gases, Chemical Vapours & Airborne Particle Testing

Price £299 + VAT

Comprehensive environmental air quality and gas screening tailored to specific property concerns.

Screening Suite Includes: IAQ air quality assessment, Volatile Organic Compounds (TVOC/VOC), Formaldehyde (HCHO), Particulate Matter (PM1.0, PM2.5, PM10), Sewer Gases (H2S, NH3, CH4), Combustion Gases (CO, O2) and ventilation performance.

Diagnostic Value: Air quality issues are often linked to damp, leaks and mould, but they cannot always be identified by a visual inspection alone. This testing helps detect hidden airborne contaminants, gases, chemical vapours and fine particles that may affect the property’s condition and indoor environment. It can also help identify problems such as poor ventilation, sewer gas ingress, off-gassing from building materials, combustion-related gases, or airborne particles following water damage, providing a more comprehensive understanding of the property’s condition.

It is also useful where a property has persistent unpleasant or unexplained odours. The testing can help investigate foul smells caused by damp, water damage, stagnant water, drains, sewer gases or chemical vapours, allowing the source of the odour to be identified more accurately.

Testing includes:

  • Indoor Air Quality Testing- IAQ
  • Volatile Organic Compound Testing- TVOC / VOC
  • Formaldehyde Testing- HCHO
  • Fine Particulate Matter Testing- PM1.0 / PM2.5 / PM10
  • Dust and Smoke Particle Testing- PM1.0 / PM2.5 / PM10
  • Sewer Gas Testing- H2S / NH3 / CH4
  • Gas Leak Screening- CH4 / C3H8
  • Carbon Monoxide Testing- CO
  • Hydrogen Sulfide Testing- H2S
  • Ammonia Odour
  • Testing- NH3
    Oxygen Level Testing- O2
  • Ventilation / Stale Air Assessment- IAQ / TVOC
  • Drain Smell Investigation- H₂S / NH3 / CH4
  • Chemical Odour Investigation- TVOC / VOC / HCHO / NH3
  • Post-Leak Air and Surface
  • Condition Assessment- PM2.5 / TVOC
  • Combustion Gas Safety Screening- CO / O2 / CH4
  • Building Material Off-Gassing Assessment- TVOC / HCHO
  • Airborne Pollutant Screening- PM1.0 / PM2.5 / PM10 / TVOC