Extractor fan installation in County Londonderry

Many extractor fans in County Londonderry homes need replacing because they never extracted properly.

Our team is based in Great Barr, Birmingham, and we work throughout County Londonderry, from Derry, Coleraine and Limavady. Visits here are by arrangement: we quote travel separately and in writing before you commit.

Extractor fans in County Londonderry at a glance

Area: County Londonderry, Northern Ireland
Towns listed: 3, largest Derry
Postcode districts: BT55, BT49, BT47, BT48 and BT52
Price region: Northern Ireland
Survey: By arrangement, travel quoted first

What extractor fan installation involves

Many existing fans were never doing their job: undersized, ducted into the loft space, fitted with a flex duct crushed in the joists, or switched off by occupants because they were noisy. 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.

New fan through an outside wall

Core drilled, sleeved, wired from a fused spur and sealed outside.

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.

Guide prices in County Londonderry

Extractor fan installation guide prices in County Londonderry
Work	Guide price
Like-for-like extractor fan replacement (existing duct and wiring) (per fan)	£160–£270 inc VAT
New extractor fan through an outside wall (core drilled, wired, tested) (per fan)	£315–£500 inc VAT
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£410–£675 inc VAT
Inline fan for a shower room or en-suite (loft-mounted, one or two ceiling grilles) (per room)	£500–£825 inc VAT
Kitchen extract fan, or cooker hood ducted to outside (per kitchen)	£365–£650 inc VAT

Guide prices using Northern Ireland rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first. Travel is quoted separately for this area.

Common reasons people call

The fan runs but a sheet of toilet paper does not stick to the grille
The fan is noisy, rattling or has stopped
The duct ends in the loft rather than outside

Rules in Northern Ireland

In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. We design to the Northern Ireland guidance and measure the airflow achieved.

How the job runs

Quick survey
Choose the fan
Fit and duct
Wire
Test

Towns we cover in County Londonderry

Questions about extractor fan installation in County Londonderry

Is the survey free in County Londonderry?

Visits here are by arrangement. Because of the ferry or long travel involved, we quote travel separately and in writing before you commit, and we can often combine visits to keep the cost down.

How much does it cost to fit an extractor fan?

Replacing a fan on an existing duct usually costs £175 to £295 including VAT. A new fan through an outside wall is typically £345 to £545, and a fan ducted to outside through the loft £445 to £745.

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 County Londonderry?

In Northern Ireland, ventilation is covered by Technical Booklet K of the Building Regulations (Northern Ireland). Workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993.

Which towns in County Londonderry do you cover?

All of County Londonderry, including Derry, Coleraine and Limavady. If your town is not listed, send the postcode and we will confirm.

We can usually fit a replacement fan in County Londonderry in a single short visit.