Extractor Fan Repair and Mould Treatment — Harley House, London

Project Overview

British Builders attended a residential property at Harley House, Frances Wharf in London to complete urgent bathroom ventilation repairs and mould treatment works.

Both bathrooms had poor extractor fan performance, allowing humidity to build up across ceilings, walls, shower areas and high-level surfaces. This caused visible mould contamination and moisture staining around the extractor units and bathroom finishes.

Our team inspected the fan units, wiring, isolators, ducting routes and surrounding areas to identify the ventilation fault and confirm the correct repair or replacement approach.

The extractor fans were mechanically and electrically tested, connections were checked, and the ventilation systems were restored. Once airflow was re-established, mould-affected surfaces were cleaned, treated and neutralised with professional anti-fungal products.

Where required, contaminated sealant was removed and replaced with sanitary-grade anti-mould silicone. Both bathrooms were cleaned down and tested again to confirm improved ventilation and moisture control.

Scope of Work

• Urgent site attendance to inspect failed bathroom ventilation
• Assessment of both bathrooms and mould-affected areas
• Electrical and mechanical testing of extractor fan systems
• Inspection of isolators, wiring and accessible ducting routes
• Airflow performance check and repair of extractor fan operation
• Allowance for replacement with humidity-controlled IP-rated fans where required
• Testing and commissioning of both ventilation systems
• Protection of bathroom fixtures and surrounding surfaces
• Application of professional anti-fungal mould treatment
• Cleaning and neutralisation of mould-affected surfaces
• Removal and replacement of contaminated silicone where required
• Final airflow testing and clean-down of both bathrooms

Challenges & Solutions

• Failed ventilation — Both extractor fans were tested to identify the issue before repair works were completed.
• High humidity — Ventilation was restored to help reduce moisture build-up during normal use.
• Visible mould — Affected surfaces were cleaned and treated with professional anti-fungal solution.
• Contaminated sealant — Deteriorated silicone was removed and replaced where required.
• Existing finishes — Fixtures, shower screens and tiled areas were protected to minimise disruption.

Final Outcome

The bathroom extractor fan repair and mould treatment works were completed successfully.

Both ventilation systems were inspected, repaired and tested to confirm correct operation. Mould-affected areas were treated and cleaned, while deteriorated sealant was replaced where required.

The works restored ventilation performance, improved moisture control and left both bathrooms cleaner, safer and ready for everyday use.

Client Feedback

“British Builders attended quickly, restored the bathroom extractor fans and treated the mould-affected areas properly. The bathrooms were left clean, tidy and much better ventilated.” – Property Client