Extractor fan installation in Dorset

A good fan in the right place cures a lot of condensation in Dorset homes on its own.

Every job in Dorset gets a written quote before it starts and a commissioning record when it finishes. We cover Christchurch, Ferndown, Dorchester, Wimborne Minster and Canford Heath and the villages around them.

Extractor fans in Dorset at a glance

Area: Dorset
Towns listed: 14, largest Bournemouth
Postcode districts: BH17, BH22, BH24, DT3, DT4 and DT6
Price region: South West
Survey: Free survey (UK mainland)

What extractor fan installation involves

The rate a fan delivers through a real duct run is often far lower than the number on the box, which is why we size to the room and test the result. For England, Approved Document F gives minimum intermittent extract rates: 15 litres a second for a bathroom, 30 for a kitchen with a cooker hood (60 without one), 30 for a utility room and 6 for a WC. Wales, Scotland and Northern Ireland have their own rules, which we follow where the job is.

Ducted to outside through the loft

Insulated duct to a roof, ridge or soffit outlet so warm moist air does not condense in the loft.

Inline fans

A quiet fan in the loft serving one or two ceiling grilles in a shower room or en-suite.

Kitchen extract and cooker hoods

A wall or window fan, or a cooker hood ducted outside rather than recirculating.

Guide prices in Dorset

Extractor fan installation guide prices in Dorset
Work	Guide price
Like-for-like extractor fan replacement (existing duct and wiring) (per fan)	£180–£305 inc VAT
New extractor fan through an outside wall (core drilled, wired, tested) (per fan)	£360–£575 inc VAT
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£465–£775 inc VAT
Inline fan for a shower room or en-suite (loft-mounted, one or two ceiling grilles) (per room)	£575–£925 inc VAT
Kitchen extract fan, or cooker hood ducted to outside (per kitchen)	£410–£725 inc VAT

Guide prices using South West rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

When to get it looked at

Mirror still steamed up 20 minutes after a shower
Mould on the bathroom ceiling or around the window
The fan runs but a sheet of toilet paper does not stick to the grille

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.

How the job runs

Quick survey
Choose the fan
Fit and duct
Wire
Test

Towns we cover in Dorset

Questions about extractor fan installation in Dorset

Is the survey free in Dorset?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

What size extractor fan does a bathroom need?

In England a bathroom fan should extract at least 15 litres a second, measured at the fan, under Approved Document F. Long or bendy duct runs reduce flow, so the fan often needs to be rated higher than the minimum.

Can an extractor fan vent into the loft?

No. A fan should discharge to outside, because warm, moist air dumped in the loft condenses on the cold roof timbers and causes mould and rot there instead.

Which rules apply to ventilation in Dorset?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Dorset do you cover?

All of Dorset, including Christchurch, Ferndown, Dorchester, Wimborne Minster and Canford Heath. If your town is not listed, send the postcode and we will confirm.

Get a guide price online, then we confirm it for your Dorset home at the visit.