Ventilation
Extractor fan assessment
Assess extractor fan performance and arrange suitable installation where poor extract contributes to mould.
Why diagnosis matters
Treat the cause, then repair the damage
Bathrooms and kitchens generate concentrated moisture. Effective local extract removes it near the source, but fan type, duct route, controls and replacement air all affect performance.
Technical review
Dan, Director / Surveyor
Last reviewed: July 2026. Advice is general until the property, access and visible evidence have been assessed.
Guarantee & aftercare
Written guarantee terms are matched to qualifying work, with inclusions, exclusions and aftercare explained before acceptance.
What we consider
Possible causes and lookalikes
Undersized or failed fan
Long or restricted ducting
Poor controls or use
No replacement-air pathway
Inspection method
A clear work sequence
Step 1
Inspect current provision
Step 2
Define improvement
Step 3
Arrange competent electrical installation
Step 4
Commission and explain operation
Scope boundaries
Honest about what the work does—and does not—cover
Electrical installation is undertaken only within verified competence or by a suitable partner. Decorative making good is separately defined.
Common questions
About extractor fan assessment
Is a bigger fan always better?+
No. Duty, duct resistance, noise, controls and replacement air should be considered together.
Should the fan run after a shower?+
Overrun or humidity controls can help clear residual moisture, depending on the room and system.
Can a fan stop all mould?+
It can reduce moisture at source but cannot repair leaks or remove every cold-surface issue.
Related services
Continue your investigation
Next step
Claim your complimentary survey before choosing a treatment
Tell us what you can see, when it changes and where the property is. Photographs can help us triage the next step.