Extractor fan installation
Bathroom, kitchen and utility fans sized to the Part F rates, ducted outside and tested.
From £175 inc VAT per fan
Guide
Standard extractor fan or continuous fan (dMEV)?
Fan vs dMEV
A continuous-running fan (dMEV) removes moisture steadily all day and boosts when needed, so it usually beats an intermittent fan that people switch off. A standard fan with a humidity sensor is a good, cheaper middle ground.
What is an intermittent fan?
A standard fan runs when the light is on or when switched, sometimes with an overrun timer. If people do not use it, moisture stays in the room.
What is a dMEV fan?
A dMEV fan runs continuously at a quiet trickle speed and boosts on humidity or a switch. It uses very little power on trickle.
Which is cheaper?
A replacement intermittent fan typically costs £175 to £295 including VAT fitted; a dMEV fan £345 to £595 including commissioning.
Which do landlords prefer?
Landlords and housing associations often specify continuous fans because tenants cannot easily switch them off.
Do continuous fans need commissioning?
Yes. Continuous mechanical extract should be airflow-tested on trickle and boost and the results recorded.
Sources
- BEAMA guidance on Part F for dwellings in England
- Checkatrade, extractor fan installation cost (2026)
Related services
Continuous extract fans (dMEV)
Quiet low-energy fans that run all the time and boost automatically when humidity rises.
From £345 inc VAT per fan
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