Cost guide
How much do extractor fans cost?
A replacement fan where one already exists is £120 to £300. A first installation with a new duct through an outside wall is £250 to £500, and a roof or soffit run £350 to £700.
Typical prices
Ranges, not quotes. A quote depends on your room.
| Work | Typical UK price |
|---|---|
| Fan replaced, existing duct | £120 to £300 |
| New fan and duct through an outside wall | £250 to £500 |
| New fan ducted to a roof tile vent | £350 to £700 |
| In line fan in the loft serving a shower | £350 to £650 |
| Humidity sensing fan supplied and fitted | £180 to £380 |
| Kitchen extract ducted to outside | £250 to £600 |
Spend the money on the duct, not on the fan. A modest fan on a short rigid run clears a bathroom that a powerful one on four metres of flexible never will.
What moves the price
- Whether a fan and a duct already exist, or a route out has to be made.
- Where the air discharges. An outside wall behind the fan is simplest; a roof tile vent needs someone on the roof.
- Duct type and length. Rigid insulated duct costs more and performs so much better that it is rarely the wrong choice.
- Switching. A timed fan needs a three core supply, which an older lighting circuit may not have.
- Fan type. Axial, centrifugal for long runs, in line mounted in the loft for a shower cubicle.
- Making good after a core drill, and scaffolding or a tower where the position is high.
Who quotes for it
Questions about extractor fans
Why is my fan dripping?
Warm wet air condensing inside a cold duct and running back. It is a loft run without insulated duct, or a run that falls back toward the fan instead of away from it. Both are fixable and neither is the fan's fault.
Can a fan vent into the loft?
No. It has to discharge outside. Venting into a loft puts the moisture into the roof structure, and the damage arrives quietly over a couple of winters.