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Condensation & Mould Remediation

Condensation & Mould Solutions

Condensation and mould can make a home feel cold, unhealthy and difficult to live in. DampMaster goes beyond surface treatment to identify why moisture is building up in the first place, then recommends practical solutions that improve the living environment and reduce the chance of the problem returning.

What We Treat

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Rising Damp

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Penetrating Damp

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Damp Proofing

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Condensation & Mould

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Woodworm

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Wet Rot

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Dry Rot

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Water Damage

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Rising Damp

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Penetrating Damp

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Damp Proofing

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Condensation & Mould

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Woodworm

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Wet Rot

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Dry Rot

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Water Damage

Why condensation and mould happen

Condensation forms when warm, moisture-laden air meets colder surfaces such as windows, external walls or poorly insulated corners. Poor ventilation, inadequate heating and excess indoor humidity can all make the problem worse. In many homes, it is the interaction between all three that creates a recurring mould issue.

Common signs in the home

Water on windows, black mould spotting, stale air, musty smells and repeated mould growth behind furniture or in colder parts of rooms. Where these conditions persist, the problem needs more than a wipe-down.

Indoor air quality testing

We carry out a full indoor air quality test as standard, measuring formaldehyde, carbon dioxide, carbon monoxide, particulate matter (PM2.5 and PM10) and total volatile organic compounds, alongside relative humidity, allowing us to calculate the dew point at which condensation actually occurs. We also assess insulation levels, heating patterns and ventilation to build a complete picture.

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How we treat black mould

Where black mould is established, we use a three-part remediation approach addressing the existing growth, the cold wall surface and the excess humidity.

1. Mould and spore remediation

Fungal growth and spores are removed fully. We prepare the area with protective sheets and prepare ourselves by wearing full PPE. Applied in two parts, we remove the mould by hand followed by manual wash-down so walls are properly cleaned rather than just chemically treated.

2. ISOtherm internal insulation

ISOtherm is a 3mm insulation roll fixed directly to the wall, then skimmed straight over for a clean, breathable, decoration-ready finish. It raises surface temperature by 5-6°C, pushes back the dew point, and reduces the wall’s U-value — meaning less heat loss and noticeably less condensation, especially across multiple treated walls.

3. Mechanical ventilation (PIV/HRU)

Ventilation disperses excess humidity, replacing it with clean, filtered air. This removes airborne moisture and contaminants at source. Particularly valuable for customers with COPD, asthma or dust allergies.

Why Homeowners & Businesses choose DampMaster Underline

Unique Approach

Unique Approach

We do not apply a one-size-fits-all fix. We treat each job with care and respect and aim to do it right first time, everytime.

Survey-Based Reccomendations

Survey-Based Reccomendations

Recommendations are based on survey findings, property type and the most appropriate treatment method.

We Fix It. Guaranteed

Guarantee-Backed Work

Damp proofing work is backed by a guarantee where applicable.

FAQs & Support

Common signs of damp include tide marks or staining on walls, peeling paint or wallpaper, black mould, musty smells, and crumbling plaster or woodwork. You may also notice condensation on windows, cold or wet-feeling walls, or a general damp feeling in certain rooms, especially at ground level or in basements.

Damp can be caused by a range of issues, including rising damp from the ground, penetrating damp due to leaks or damaged masonry, condensation from excess moisture in the air, or even faulty gutters and drains. Our surveyors will assess your property to identify the exact cause and recommend the right solution.

Yes, especially if you’re seeing signs of damp or planning to buy a new property. A professional damp survey will help you understand the cause, severity, and best course of action. It’s the first step toward protecting your home (and your wallet) from long-term damage.

Costs can vary depending on the type of damp, the size of the affected area, and the treatment required. We carry out an initial damp survey so we can assess your property properly and provide a clear, fixed-price quote with no hidden fees.

Most treatments are completed within a few days, depending on the size of the job. We’ll always give you a clear timeline upfront, and we work hard to minimise disruption to your home.

In most cases, no. You can stay in your home while we carry out the work. If large areas need treatment or plastering, we’ll discuss this with you in advance so you can plan accordingly.

Yes, if plastering is part of the process, you’ll need to redecorate. We’ll leave your walls ready to paint or wallpaper once they’ve dried fully. We can also recommend trusted decorators in your area if needed.

Yes. All DampMaster surveyors are PCA-trained and experienced in identifying damp, timber, and other issues. Our technicians are fully trained, insured, and follow strict standards to ensure high-quality workmanship. Our surveyors also hold ABBE Level 3 in Damp, Mould and Condensation.

We have local experts covering towns and cities across the UK. Our Locations page will help you to check coverage in your area, or just give us a call on 08000 88 66 99 and we’ll be happy to help.

We’re here to help. Whether you want advice, a second opinion, or to book a survey, get in touch with your local DampMaster expert today.

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We manage your entire project from start to finish so you don't have to juggle multiple contractors. From your initial survey to roofing, drainage, external rendering, and internal plastering - we handle it all under one roof.

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    Protecting homes and businesses across the UK from damp, mould, timber decay and structural issues for over 15 years.


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