- Postcode districts
- SL9, UB9
- Nearby
- Chalfont St Peter, Uxbridge and Rickmansworth
- Guide price
- £280–£650
- Typical time on site
- half a day
- Water
- Hard across most of Buckinghamshire
- Survey
- Free, at your home
What does a bathroom extractor fan cost in Gerrards Cross?
For Gerrards Cross, our guide range for a bathroom extractor fan is £280 to £650 including VAT. We adjust the national guide for South East England, where prices are typically about 12% above the UK average. The figure depends on the size of the room, whether anything moves, and the products you pick.
Extractor fan
- Ducted to outside
Inline fan
- Grille in the ceiling
Continuous extract
- Low-energy fan running all the time
Guide prices for Gerrards Cross including VAT. Your itemised written quote after the free survey is the price that counts.
Working in Gerrards Cross
As well as Gerrards Cross itself (SL9 and UB9), we survey in Chalfont St Peter, Uxbridge and Rickmansworth.
Being a smaller town does not change how we work in Gerrards Cross: free survey, written quote, one team. We check the duct route at Gerrards Cross surveys, because a short, straight run to outside matters more than the fan's headline figure. In Gerrards Cross flats, a new vent through an outside wall may need freeholder consent, so we raise it at the survey.
Water across much of Buckinghamshire is hard. Steam carries that scale onto mirrors and glass, so a fan that clears the room quickly helps on both counts. Hardness varies street by street, so check the figure for your postcode with your water supplier.
What the job includes
- A fan chosen to meet the bathroom extract rate: 15 l/s intermittent or 8 l/s continuous
- Run-on timer, humidistat or light-linked switching set up to suit how the room is used
- A backdraught shutter and external grille, so cold air does not blow back in
- Rigid or semi-rigid ducting kept short and straight, and insulated where it crosses a cold loft
Decisions to make first
Wall or ceiling
A wall fan on an outside wall is the simplest. A ceiling fan over the shower takes steam away at source but needs ducting through the loft.
Timer or humidistat
A timer keeps the fan running after the light goes off. A humidistat starts it whenever moisture rises, which suits rooms where people forget.
Rules that apply in England
In England, Approved Document F sets bathroom extract at 15 l/s for an intermittent fan or 8 l/s for continuous extract. Wiring a new fan alters a circuit in a room with a bath or shower, so it is notifiable under Part P.
