Professional black mould removal, treatment and prevention across London. Damp & Mould Solutions provides specialist mould removal services for homes, rented properties, and commercial buildings throughout London. We identify the source, remove the mould safely using fungicidal treatments, and address the underlying cause — so it doesn’t come back.
📞 020 4542 6114 |Book a survey → |Contact us →
Rated 4.9 ★ on Google across 37+ reviews.
Arrived on time, very respectful and left the house very clean and tidy after work each day.
Transpired to be a slightly job than anticipated but the whole team was very accommodating and went above and beyond to get it done.
Would recommend!
Thankfully after a recommendation I contacted Damp and Mould Solutions, Mick came over to the property the next day and gave me straight forward easy to understand advice with a very reasonable quote and time frame.
From the beginning to end it was an absolute pleasure to work with this company. Great time keeping and came in on budget.
The work was completed within the quoted period and all the rubbish was cleared.
I highly recommend these experts to resolve any of your damp and mould issues.
These guys are honest which is hard to find when looking for damp solutions.
Responsiveness, Punctuality, Quality, Professionalism, Value and honesty
What Is Professional Mould Removal?
Professional mould removal is the safe, thorough elimination of mould from walls, ceilings, and surfaces using specialist fungicidal chemicals and treatments that go beyond what DIY products can achieve. A professional service identifies the moisture source causing the mould, removes all visible and hidden spores, applies a protective treatment to prevent regrowth, and advises on long-term prevention.
Unlike supermarket mould sprays — which bleach the surface without killing the root — professional treatment targets the mould at its source and creates a lasting barrier. This is why mould cleaned professionally does not return in the way DIY-treated mould does.
Signs You Need a Mould Removal Service
Black mould rarely announces itself clearly. Here are the key signs that your property needs professional mould removal:
Visible dark patches on walls, ceilings, or around windows — The most obvious sign. Black or dark grey patches, often around corners, window frames, and behind furniture, indicate active mould growth.
Persistent musty or damp smell — A strong musty odour, even without visible mould, often means mould is present inside walls, under floors, or in hidden spaces. Read our guide to damp smells →
Respiratory symptoms at home — Frequent headaches, coughing, sneezing, or worsening asthma indoors can be caused by airborne mould spores. Mould is classified as a Category 1 hazard under the Housing Health and Safety Rating System (HHSRS) — the same category as asbestos.
Mould returning within weeks of cleaning — If mould keeps coming back after you’ve cleaned it, the moisture source has not been treated. Professional intervention is the only lasting fix.
Black mould in a rented property — Landlords have a legal obligation to remove mould professionally. Read about tenants and landlords rights →
Get a free assessment: If you’re unsure whether you need professional mould removal, call us on 020 4542 6114 and describe what you’re seeing. We’ll advise you honestly.
Our Mould Removal Process: How It Works
Our professional mould removal service follows a structured process to ensure thorough, lasting results.
Step 1: Survey and Assessment
We begin with a full assessment of the affected areas. Using professional moisture meters and inspection equipment, we identify all areas of mould growth — including hidden mould inside walls or behind surfaces — and determine the underlying moisture source. Without fixing the cause, any mould treatment is temporary.
👉Book a professional damp and mould survey →
Step 2: Preparation and Protection
Before treatment begins, we protect flooring, furniture, and unaffected surfaces. Our operatives use appropriate PPE throughout. Where mould growth is extensive, we take steps to contain spores during removal.
Step 3: Manual Washdown and Fungicidal Treatment
We manually clean all affected surfaces using professional-grade fungicidal solutions. These penetrate deep into the material — unlike surface bleach products — to destroy mould at its roots and eliminate spores at the source. This is the critical step that prevents immediate regrowth.
Step 4: Protective Surface Treatment
After cleaning, we apply a specialist fungicidal barrier treatment to treated surfaces. This creates ongoing protection against mould regrowth and is combined with a mould-resistant finish coat where replastering is required.
Step 5: Damp-Proof Paint Application (Where Required)
For walls prone to condensation and moisture, we apply high-performance damp proof and anti-condensation paints. These provide a long-lasting barrier that helps prevent mould from reoccurring.
Step 6: Root Cause Treatment and Prevention Advice
Mould removal is only half the job. We address the underlying moisture issue — whether that’s condensation, rising damp, penetrating damp, or inadequate ventilation — and provide clear advice on preventing recurrence. Where ventilation improvements are needed, we can install positive input ventilation systems or condensation control solutions.
Why DIY Mould Treatment Fails
It can be tempting to reach for a mould spray from a supermarket. For a very small, isolated patch on a bathroom sealant, this can work as a short-term measure. But in most other cases, DIY mould treatment fails for three consistent reasons:
It doesn’t reach the roots. Household bleach-based sprays decolourise mould on the surface but do not penetrate into the plaster or wall substrate where the mould’s root structure (mycelium) continues to grow. The black patches disappear temporarily, then return within weeks.
It doesn’t fix the moisture source. Without addressing why the mould appeared — condensation, a leak, rising damp — the conditions for regrowth remain. No treatment product can compensate for an unresolved moisture problem.
It can spread spores. Scrubbing mould without containment measures can disperse spores into the air and to other parts of the property, potentially spreading the problem.
Professional mould removal addresses all three issues. This is why properties treated professionally by a qualified specialist do not routinely experience the rapid mould regrowth that follows most DIY attempts.
👉 Read more: DIY vs professional damp and mould solutions →
Black Mould Removal London: Where We Work
We provide professional black mould removal services across London, including:
Barnet · Hackney · Haringey · Camden · Kensington · Ealing · Brent · Enfield · Hackney · Islington · Tottenham · Wood Green · and across all London boroughs →
We also cover North Hertfordshire, including Bishop’s Stortford and surrounding areas.
Mould Removal for Landlords and Tenants
Mould in a rented property is one of the most common disputes between landlords and tenants in London. Under the Homes (Fitness for Human Habitation) Act 2018 and the Landlord and Tenant Act 1985, landlords are legally required to keep properties free of Category 1 health hazards — which includes damp and mould.
For landlords: We work efficiently with tenants to complete mould removal and treatment with minimal disruption. We provide a written scope of works and completion report, and can carry out treatments between tenancies or in occupied properties. View our landlord services →
For tenants: If your landlord is unresponsive to a mould complaint, a professional assessment report from us can be used as formal evidence in housing complaints and legal proceedings. Read about your rights as a London tenant →
How Much Does Mould Removal Cost in London?
Mould removal costs in London depend on the extent of the problem, the size of the affected area, and whether replastering or ventilation improvements are needed. As a general guide:
- Small to medium mould treatment (single wall or room): £200 – £600
- Extensive mould removal with fungicidal treatment (multiple rooms): £600 – £1,500
- Full remediation with replastering and ventilation work: £1,500 – £3,500+
We provide itemised, no-obligation quotes after an initial assessment. There are no hidden costs.
👉 Read the full London damp and mould treatment cost guide →
Before & After: Mould Removal Results
BEFORE:
AFTER IMAGE:
Our treatments produce a complete transformation — walls that were dark with mould growth returned to a clean, treated surface ready for redecoration. See our case studies →
Get a Quote for Mould Removal in London
Ready to get rid of mould for good? Contact our team today.
📞 Call: 020 4542 6114 📧 Email: info@dampandmouldsolutions.co.uk
We offer same-week visits across London. All surveys are carried out by qualified specialists. We’ll give you an honest assessment and a clear, itemised quote — no pressure, no hidden costs.
FAQ
What is the best way to remove black mould from walls?
The most effective way to remove black mould from walls is professional fungicidal treatment. A specialist applies a clinical-grade fungicidal solution that penetrates into the wall substrate and destroys the mould at its roots — not just on the surface. The wall is then treated with a protective barrier coating to prevent regrowth. Household bleach products remove the visible colour but leave the root structure intact, which is why DIY-treated mould nearly always returns within weeks.
How much does mould removal cost in London?
Mould removal in London typically costs between £200 and £600 for a single room treatment, and £600 to £1,500 for more extensive multi-room remediation. Costs rise if replastering or ventilation improvements are needed. All quotes from Damp & Mould Solutions are itemised and provided after assessment with no obligation.See our full cost guide →
Does professional mould removal stop it coming back?
Yes — provided the underlying moisture cause is also addressed. Professional treatment using fungicidal solutions destroys the mould’s root structure and applies a protective barrier that prevents regrowth. However, if the moisture source (condensation, rising damp, a leak) is not fixed, mould will eventually return regardless of treatment. Our service always includes root cause diagnosis and prevention advice.
Is black mould dangerous?
Yes. Black mould is classified as a Category 1 hazard under the Housing Health and Safety Rating System (HHSRS) — the same severity category as asbestos. Exposure to mould spores is linked to upper respiratory problems, persistent coughing and sneezing, worsening asthma and allergies, headaches, and fatigue. Vulnerable individuals — including children, the elderly, and people with respiratory conditions — are at the greatest risk. Read about how damp affects health →
How long does mould removal take?
A standard mould removal treatment for a single room typically takes half a day to a full day. Extensive treatments covering multiple rooms, or jobs that include replastering, may take two to three days. The treated surfaces will need a drying period before redecoration — usually one to two weeks.
Can mould removal be done while the property is occupied?
Yes. We carry out mould removal treatments in occupied properties regularly, including in London homes and rented flats with tenants in residence. We take precautions to protect other areas of the property and use products that are safe once dry. We’ll advise you on any short ventilation period required after treatment.
My landlord says the mould is caused by condensation and is my fault. Is that true?
It can be partly true, but it is rarely entirely the tenant’s fault. Condensation mould is the result of excess moisture meeting cold surfaces — and if the property lacks adequate ventilation, heating, or insulation, those are the landlord’s responsibility to address. Your landlord cannot simply blame lifestyle without assessing whether the property itself meets a reasonable standard. An independent survey report can formally establish whether the cause is structural or behavioural.
What causes mould to keep coming back in the same spot?
Mould that returns repeatedly in the same location almost always indicates a persistent moisture source that has not been treated. Common causes include: condensation from inadequate ventilation, cold bridging in the wall causing a consistently cold surface, a slow leak in the wall or ceiling, rising damp at low level, or penetrating damp entering from outside. A professional damp survey will identify the specific cause.
Do you remove mould from commercial and rented properties in London?
Yes. We work with residential homeowners, private landlords, letting agents, property management companies, and commercial businesses across London. We are experienced in completing mould treatment in tenanted properties and can provide a written completion report for landlords’ records.
Is there a health risk during mould removal?
Our operatives use appropriate personal protective equipment during treatment, and we follow best practice for containment. Once treatment is complete and the treated area is dry and ventilated, the property is safe for normal occupation. We will advise you specifically on any precautions relevant to the scale of the job.