Continuous extract fans (dMEV) in Northumberland

A dMEV (decentralised mechanical extract ventilation) fan is a low-energy extract fan that runs continuously at a quiet trickle speed and boosts automatically when it senses humidity or a light switch. Because it never fully switches off, moisture is removed steadily instead of building up between showers.

Every job in Northumberland gets a written quote before it starts and a commissioning record when it finishes. We cover Cramlington, Ashington, Bedlington, Darras Hall and Morpeth and the villages around them.

dMEV fans in Northumberland at a glance

Area: Northumberland
Towns listed: 10, largest Blyth
Postcode districts: NE63, NE22, NE24, NE15, NE18 and NE22
Price region: North East
Survey: Free survey (UK mainland)

What the work involves

Landlords and housing associations often choose them because tenants cannot switch them off and forget them. Under Approved Document F, continuous mechanical extract systems need commissioning: the airflow on both trickle and boost is measured and recorded. We do that as part of the job, so you have a record for building control, a landlord file or a future buyer.

Kitchen

Higher-rated continuous fans where a ducted hood is not practical.

Whole-home dMEV upgrade

Every wet room converted at once, with trickle vents checked in the habitable rooms.

Commissioned and recorded

Trickle and boost rates measured and written on a commissioning sheet.

Guide prices in Northumberland

Continuous extract fans (dMEV) guide prices in Northumberland
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£315–£550 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£135–£270 inc VAT

These ranges use our North East rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

Common reasons people call

You are refurbishing several wet rooms at once
An energy retrofit has made the house more airtight
Building control has asked for continuous extract

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. For homes, it sets minimum extract rates such as 15 litres a second for a bathroom and 30 or 60 for a kitchen, and expects mechanical systems to be airflow-tested.

How the job runs

Survey
Specify
Fit
Commission
Record

Towns we cover in Northumberland

Questions about continuous extract fans (dMEV) in Northumberland

Are prices different in Northumberland?

Our guide prices are adjusted by region. In Northumberland we use North East rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £315 to £550 inc VAT per fan.

Can dMEV fans be fitted where a fan already exists?

Usually yes. Most fit the existing hole or duct, which keeps the cost and mess down.

How much does a continuous extract fan cost?

A dMEV fan usually costs £345 to £595 including VAT per room, supplied, fitted and commissioned. Converting several rooms in one visit brings the cost per fan down.

Is the survey free in Northumberland?

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.

Which rules apply to ventilation in Northumberland?

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.