Mould In The Home: How To Recognise, Treat, and Avoid Mould Problems

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Mould In The Home: How To Recognise, Treat, and Avoid Mould Problems

10th February, 2023

Mould is a major problem for homeowners and renters around the UK, with some experts estimating that one in every five renters in Britain has to deal with mould at some point during their occupancy. But what is mould, what causes it to grow in our homes, and is it dangerous to live in a house with mould? Do you need an independent damp survey and expert help to get rid of mould? And once it has gone, how can you stop it from coming back? These are just some of the questions we hope to answer in this guide to mould in your home.

What Is Mould?

While some mould may resemble moss and other tiny plants, mould belongs to the Fungi kingdom, which also includes mushrooms, yeasts, rusts, mildews, and smuts. Mould is part of the natural environment and its main purpose is to break down organic waste like dead leaves so that the nutrients in those materials can be returned to the environment. This makes them a vital part of ecosystems, as they not only prevent dead and decaying materials from building up and causing problems, but they also play a key role in the nutrient cycle and keeping ecosystems functioning as they should.

What Causes Mold To Grow In Homes?

While mould may not be a welcome guest, many homes provide the ideal climate for most kinds of mould to thrive. Mould does best in dark, moist, humid conditions with minimal ventilation, making basements, dark kitchen cupboards, and bathroom ceilings the perfect places for them to settle in and spread. Dampness in a house is a surefire way to attract mould, especially in older homes that suffer from rising damp. Treatment for rising damp is therefore essential if you hope to keep mould growth to a minimum in your home.

Mould Versus Mildew: What’s the Difference?

A mildew may be a mould, but not every mould is a mildew. Mildew refers to a group of specific kinds of mould, namely those that have a flat growth pattern. Both mildew and mould need similar conditions to grow in, and both spread through the release of spores into the environment. What separates mildew from mould is where they tend to grow, and how easy they are to get rid of. Mildew loves warm, moist surfaces, and common places in the home where you might find mildew is on fabrics, paper, and leather that weren’t dried after getting wet, as well as in the floors, walls, and ceilings of rooms that experience high levels of humidity, such as bathrooms and kitchens.

Can I Tell A Mildew From A Mould?

If you aren’t sure if you have mildew or mould growing in your home, look at the visual appearance of the growth. If it looks almost like white, grey, or brown flat powder, it is most likely mildew. If it appears to be a shade of green, black, or red and looks fuzzy or fluffy, it is most likely a mould. While both should be avoided, mould is a much bigger problem than mildew.

Is Mould Dangerous Or Bad For Our Health?

In short, yes. Mould can be extremely bad for a person’s health. People that are most affected by mould include infants, children, the elderly, people with compromised or weakened immune systems, and people with pre-existing skin problems, allergies, or respiratory problems. This is because moulds produce allergens that are released into the environment. If these allergens are inhaled, they can cause irritation, and allergic reactions, and can also induce asthma attacks.

What Mould Is the Worst For Your Health?

One of the most dangerous types of mould is Stachybotrys, also called black mould. Inhaling the spores from this mould can cause symptoms ranging from headaches, diarrhoea, and respiratory irritation to memory loss and severe respiratory damage. Children are most at risk from black mould as their lungs are still developing. If mould is a frequent problem in your home, consult a damp proofing London specialist. UK homes are especially susceptible to mould problems thanks to the cold, wet weather, and the lack of good ventilation in many houses.

What to Look Out For: Signs and Symptoms of Mould

Because of where moulds like to grow, you may end up feeling the side effects of exposure to mould before you spot it in your home. Physical symptoms include red or itchy skin and eyes, a stuffy nose, and wheezing. In people who may be more sensitive to mould allergens, reactions can be more intense, ranging from shortness of breath to fevers. Some common symptoms of mould to look out for in your home include damage to clothing and walls and ceilings. Moulds often emit an earthy smell, almost like rotting vegetation or wood. It can also appear musty, or stale, like an attic being aired out after months of being closed up. Different kinds of mould may present differently, so if you suspect you may have mould in your home, do your research so you can identify the type that you are dealing with.

Getting Rid of Mould

Once you know what mould you are dealing with, the next step is finding the right treatment for it. If caught early, most common mildews and moulds can be dealt with fairly easily. A solution of chlorine bleach or vinegar and water in a spray bottle will help kill off the mould before you take a stiff-bristled brush to the area. Once you’ve lifted it from the surface, a thorough rinse and dry should get the area clear. You may need to repeat the process a few times to make sure you eradicated it.

If the problem is more deep-seated, consider consulting with an expert who can either advise on solutions or come in and remove it themselves. Once the mould is gone, consider contacting a damp specialist for best results. If you are planning on buying or selling property, screening for mould is especially essential. An independent survey, property survey, or pre-purchase survey will include a mould or damp inspection, to give property owners peace of mind when making a purchase.

Mould is an issue that affects a huge number of homes. Don’t wait for your home survey results to start treating mould if you spot it in your home. Take action and protect your family from mould and its effects today.

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