- Postcode districts
- AL7, AL8
- Nearby
- Hatfield, Hertford and St Albans
- Guide price
- £265–£650
- Typical time on site
- half a day
- Water
- Very hard across most of Hertfordshire
- Survey
- Free, at your home
What does a bathroom extractor fan cost in Welwyn Garden City?
In Welwyn Garden City, a bathroom extractor fan typically costs £265–£650 including VAT, based on East of England prices. We adjust the national guide for East of England, where prices are typically about 6% 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 Welwyn Garden City including VAT. Your itemised written quote after the free survey is the price that counts.
Working in Welwyn Garden City
As well as Welwyn Garden City itself (AL7 and AL8), we survey in Hatfield, Hertford and St Albans.
Homes in and around Welwyn Garden City vary, so we look at the floor, the walls and the water system before we price anything. If your Welwyn Garden City bathroom has black mould on the ceiling or silicone, the fan and its duct are the first things we check. For windowless bathrooms in Welwyn Garden City homes, continuous extract that boosts on humidity often works better than a fan tied to the light switch.
Most of Hertfordshire 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 fan chosen to meet the bathroom extract rate: 15 l/s intermittent or 8 l/s continuous
- Core-drilling through the wall, or ducting through the loft to a roof or soffit vent
Decisions to make first
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.
Replacement air
A fan needs air to replace what it removes, so leave a gap of around 10 mm under the door or fit a door grille. A sealed room starves the fan.
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.
