Overview
At Damp and Mould Solutions, we pride ourselves on delivering thorough and professional mould remediation services. This case study documents a black mould infestation we treated in a residential property in London, including the diagnostic method, treatment specification, and the standards our surveying team worked to.
CSRT (Certified Surveyor of Remedial Treatments) & PCA(QT) Qualified Timber and Damp Surveyor · 15+ years diagnosing and remediating damp and mould in UK residential and local authority housing stock.
The Problem
| Client | Barnet Council (local authority housing) |
| Location | Stairway leading to the first floor, residential property, London |
| Issue | Severe black mould infestation around a stairway window |
| Likely species | Consistent with Cladosporium/Stachybotrys-type black mould commonly found on cold, poorly ventilated internal surfaces in the UK — visual identification only; sampling was not commissioned for this job |
| Standard followed | PCA (Property Care Association) remedial treatment guidance |
A homeowner contacted us with concerns about extensive black mould growth around a window on their stairway. The mould had penetrated into the wall surface, posing a health risk to occupants and cosmetic and structural damage to the plaster finish.
Initial Assessment
Our surveying team carried out a detailed on-site inspection of the affected area, including a moisture reading survey of the surrounding wall and window reveal. We found:
- Extensive black mould around the window frame and surrounding walls
- Elevated surface and relative-humidity moisture readings consistent with condensation-driven mould growth rather than rising or penetrating damp
- Restricted airflow at the stairway landing, a common contributing factor in cold-bridge mould cases
- Potential health hazards from airborne mould spores, in line with HSE guidance on mould exposure risk
We explained the diagnosis and remediation process to the client and agreed a scope of works before starting on site.
The Remediation Process
1. Safety Measures
- Technicians wore full personal protective equipment (PPE), including respiratory protection appropriate for mould spore exposure
- The area was sealed off to prevent spore spread to other parts of the house during works
2. Initial Cleaning and Fungal Biocide Application
- Surface mould was removed using HEPA-filtered vacuum extraction to limit spore disturbance
- An active fungal biocide was applied to all contaminated surfaces to penetrate and destroy mould roots (hyphae), not just visible surface growth
3. Deep Cleaning and Biocide Reapplication
- Manual washdown of walls and window frame with specialised anti-fungal cleaning agents
- Reapplication of biocide to ensure eradication of remaining mould spores before decoration
4. Anti-Mould Paint Application
- High-performance anti-mould paint was applied to cleaned and fully dried surfaces, providing a long-lasting protective barrier against regrowth
5. Final Inspection and Ventilation Improvement
- A final surveyor inspection confirmed complete mould eradication before sign-off
- We advised on improving stairway ventilation to prevent future damp issues, including installing an extractor fan and promoting regular airflow at the landing
Results
A follow-up check was carried out after decoration to confirm there was no regrowth once the anti-mould paint had cured.
Client Testimonial
“We couldn’t be happier with the results. The team was professional, thorough, and considerate of the historic nature of our home. We no longer worry about damp and mould, and our home feels fresh and healthy. Thank you for giving us peace of mind!”
Conclusion
The comprehensive black mould remediation carried out by Damp and Mould Solutions successfully eradicated the infestation, restoring the safety and appearance of the homeowner’s stairway. The combination of fungal biocide treatment and anti-mould paint, specified and signed off by a CSRT/PCA(QT) qualified surveyor, ensured a durable, standards-compliant solution.
If you’re facing similar issues with mould in your property, contact Damp and Mould Solutions today for a professional assessment and effective remediation service.
Preventing Black Mould: Practical Tips
Black mould typically arises from excess moisture or condensation and can be addressed by reducing humidity in the home:
- Identify the source: Determine where the moisture originates before treating symptoms.
- Ventilate: Open windows and doors frequently; use extractor fans while cooking or showering.
- Reduce water temperature: Lower your water temperature to reduce steam.
- Dry clothes outside: Where possible, dry laundry outside instead of on a radiator.
- Use a mould remover: Treat small affected areas with an anti-fungal mould remover.
- Install ventilation: For persistent mould, consider a positive input or heat-recovery ventilation system.
- Insulate: Proper insulation reduces condensation by warming internal wall and ceiling surfaces.
Frequently Asked Questions
How long does black mould remediation like this take?
A localised job of this size is typically completed within a day of on-site works, with a follow-up inspection scheduled after decoration has fully cured.
Will the mould come back after treatment?
Provided the underlying moisture or ventilation cause is addressed — as it was here with an extractor fan recommendation — properly treated and painted surfaces should not see regrowth. Recurrence usually indicates an unresolved moisture source.
Is black mould in a UK home dangerous?
Prolonged exposure to mould spores can affect respiratory health, particularly for children, older people, and those with asthma or allergies. See our guide on how damp affects health for more detail.
Why Choose Us?
- Expertise: CSRT/PCA(QT) qualified surveyors with 15+ years’ experience in mould remediation.
- Comprehensive solutions: Thorough inspection, treatment, and prevention strategies.
- Safe and effective methods: Advanced biocides and anti-mould paints applied to PCA guidance.
- Customer satisfaction: Dedicated to ensuring our customers’ homes are safe and mould-free.
Get in touch for a quote
Call us at 020 4542 6114 or complete the form below to get started, or email info@dampandmouldsolutions.co.uk.
Professional surveys detect issues early, preventing costly repairs and ensuring a safe, healthy environment. Compliance with regulations is crucial for businesses, enhancing employee and customer satisfaction.