- Postcode districts
- DE1, DE21, DE22, DE23, DE24
- Nearby
- Belper, Ilkeston and Heanor
- Guide price
- £240–£600
- Typical time on site
- half a day
- Water
- Moderately hard across most of Derbyshire
- Survey
- Free, at your home
What does a bathroom extractor fan cost in Derby?
Our guide price for a bathroom extractor fan in Derby is £240–£600 including VAT. We adjust the national guide for East Midlands, where prices are typically about 4% below 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 Derby including VAT. Your itemised written quote after the free survey is the price that counts.
Working in Derby
We cover every part of Derby, including DE1, DE21, DE22 and 2 more postcode districts, and nearby Belper (6.9 miles) and Ilkeston (7.7 miles).
Derby is a big place with every kind of home, from terraces to flats to new builds, so we never price from a photo alone. In Derby flats, a new vent through an outside wall may need freeholder consent, so we raise it at the survey. For windowless bathrooms in Derby homes, continuous extract that boosts on humidity often works better than a fan tied to the light switch.
Supplies across most of Derbyshire are moderately hard. Scale is a minor issue next to condensation, which is what a properly sized extractor fan is for. Hardness varies street by street, so check the figure for your postcode with your water supplier.
What the job includes
- A backdraught shutter and external grille, so cold air does not blow back in
- A check of the room, any existing fan or vent, and the shortest route to the outside
- Rigid or semi-rigid ducting kept short and straight, and insulated where it crosses a cold loft
- A fan chosen to meet the bathroom extract rate: 15 l/s intermittent or 8 l/s continuous
Decisions to make first
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.
Intermittent or continuous
An intermittent fan runs during and after use. A continuous fan runs quietly all the time at a low rate and boosts when humidity rises.
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.
