- Postcode districts
- DA1
- Nearby
- Bexley, Swanley and Swanscombe
- Guide price
- £280–£650
- Typical time on site
- half a day
- Water
- Very hard across most of Kent
- Survey
- Free, at your home
What does a bathroom extractor fan cost in Dartford?
For Dartford, 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
- Fan with timer or humidistat
Inline fan
- Ducting to a roof or soffit vent
Continuous extract
- Good for windowless rooms
Guide prices for Dartford including VAT. Your itemised written quote after the free survey is the price that counts.
Working in Dartford
We work right across Dartford — DA1 — and in neighbouring Bexley and Swanley.
In Dartford, as anywhere, the age of the house decides a lot: pipe sizes, floor construction and where the soil stack runs. Fans fitted in Dartford bathrooms are wired by a qualified electrician, with RCD protection and an isolator outside the room. In Dartford flats, a new vent through an outside wall may need freeholder consent, so we raise it at the survey.
Most of Kent has very hard water. 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
- Wiring by a qualified electrician, with an isolator outside the room and RCD protection
- Rigid or semi-rigid ducting kept short and straight, and insulated where it crosses a cold loft
- A backdraught shutter and external grille, so cold air does not blow back in
- A fan chosen to meet the bathroom extract rate: 15 l/s intermittent or 8 l/s continuous
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.
