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Remove black mould.
Treated, killed and re-painted — with the underlying damp cause fixed, not just the symptom.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any damp proofer starts on black Mould Removal.
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Top tips
Hiring a damp proofer, without the regret.
Four moves that separate a smooth job from a nightmare.
Painting over without treatment
Returns in months. Anti-mould paint alone doesn't prevent if cause continues. Treat first, paint second, fix cause third.
Cheap bleach used
Bleach surface-kills but doesn't penetrate substrate. Spores remain. Use proper biocide (HG, Ronseal Anti-Mould).
Ventilation off in winter
Tenants turn off extractors to save energy. Continuous low-rate dMEV better.
Severe mould health risk
Some moulds (Stachybotrys) are serious health risks. Get specialist remediation for elderly, asthmatic, immunocompromised occupants.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Surface mould treatment per areaWipe with biocide
£40–£150
Severe mould strip & redecorate per roomIncluding paint
£250–£800
Anti-mould primer per litreZinsser Perma-White
£15–£40
Anti-mould paint per litreCrown, Dulux, Polycell
£15–£40
Bathroom extractor upgradeHumidistat type
£150–£400
Whole-house ventilation (PIV)Long-term solution
£500–£1.2k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Damp Proofer briefing.
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Damp Proofer explained
Black mould (Stachybotrys, Aspergillus, Cladosporium) is a health risk and a sign of underlying damp. Awaab's Law (2026) requires landlords to address it in tenant properties within strict timeframes. Expect to pay £60–£500 per room for UK black mould removal.
What Does the Work Involve?
Mould surface treatment with biocide (HG, Polycell Mould Killer, Ronseal Anti-Mould). Hard surfaces wiped with biocide solution. Porous surfaces (plaster, paint) may need stripping. Cause identified — usually condensation, leak, or penetrating damp. Cause addressed. Anti-mould primer (Zinsser Perma-White, Polycell Damp-Seal) applied. Anti-mould top coats. Ventilation upgrade often essential.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Surface mould treatment per area | 40 | 150 | Wipe with biocide |
| Severe mould strip & redecorate per room | 250 | 800 | Including paint |
| Anti-mould primer per litre | 15 | 40 | Zinsser Perma-White |
| Anti-mould paint per litre | 15 | 40 | Crown, Dulux, Polycell |
| Bathroom extractor upgrade | 150 | 400 | Humidistat type |
| Whole-house ventilation (PIV) | 500 | 1,200 | Long-term solution |
| Specialist mould remediation | 500 | 2,500 | Whole-house, certified |
| Air quality testing | 150 | 500 | Mould spore identification |
How Long Does It Take?
Surface treatment: 1–2 hours per area. Strip and repaint: 1–2 days per room. Ventilation install: 2 hours – half a day. Whole-house remediation: 1–2 weeks.
DIY or Professional?
Surface treatment with consumer products: DIY. Underlying cause (ventilation, insulation, leak): professional. Severe cases or health concerns: specialist mould remediator.
Choosing the Right Tradesperson
PCA-qualified for damp diagnosis. Specialist mould remediation company for severe cases (IICRC certified). For landlord work: must comply with Awaab's Law timeframes.
UK Regulations
Awaab's Law 2026: landlords must address mould within strict timeframes — typically 7–14 days for serious health-related cases. Building Regs Part F: minimum ventilation rates. Painting over without treatment is non-compliant.
Common Problems
- Painting over without treatment: Returns in months. Anti-mould paint alone doesn't prevent if cause continues. Treat first, paint second, fix cause third.
- Cheap bleach used: Bleach surface-kills but doesn't penetrate substrate. Spores remain. Use proper biocide (HG, Ronseal Anti-Mould).
- Ventilation off in winter: Tenants turn off extractors to save energy. Continuous low-rate dMEV better.
- Severe mould health risk: Some moulds (Stachybotrys) are serious health risks. Get specialist remediation for elderly, asthmatic, immunocompromised occupants.
Frequently Asked Questions
Is black mould dangerous?
Some moulds (Stachybotrys chartarum, Aspergillus) can cause respiratory issues, asthma triggers, immune reactions. Most common UK black mould is less dangerous but still warrants treatment.
What kills black mould?
Quality biocides: HG Mould Remover, Polycell Mould Killer, Ronseal Anti-Mould. Bleach surface-kills but less effective on porous surfaces.
Will anti-mould paint stop it returning?
Slows re-emergence but doesn't fix underlying cause. Quality anti-mould paints (Zinsser Perma-White, Crown Clean Extreme) keep mould at bay for years if cause addressed.
Why does mould keep coming back?
Underlying cause not fixed. Most often inadequate ventilation. Tenant lifestyle (drying clothes inside, not using extractors) major factor too.
What's Awaab's Law?
UK 2026 legislation requiring landlords to address damp and mould within strict timeframes. Named after Awaab Ishak (2-year-old who died from mould exposure 2020).
Can I claim against my landlord?
If landlord fails to address known mould within Awaab's Law timeframes: yes, possible. Document with photos and dates. Tenant compensation possible.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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