Continuous extract fans (dMEV) in County Durham

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 County Durham gets a written quote before it starts and a commissioning record when it finishes. We cover Stanley, Consett, Darlington, Hartlepool and Stockton-on-Tees and the villages around them.

dMEV fans in County Durham at a glance

Area: County Durham
Towns listed: 14, largest Darlington
Postcode districts: DL4, DL14, SR2, SR3, SR8 and TS27
Price region: North East
Survey: Free survey (UK mainland)

How we do it

dMEV fans replace ordinary intermittent fans in bathrooms, kitchens, utility rooms and WCs. On trickle speed they are barely audible and use very little power; on boost they reach the higher continuous-extract rates in Approved Document F (in England, at least 13 litres a second for a kitchen, 8 for a utility room or bathroom and 6 for a WC). Landlords and housing associations often choose them because tenants cannot switch them off and forget them.

Bathroom and en-suite

Through-wall or ceiling fans with humidity-controlled boost.

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.

Guide prices in County Durham

Continuous extract fans (dMEV) guide prices in County Durham
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

North East rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

Signs it is time to call us

Occupants switch fans off because of noise
Mould keeps returning in a bathroom with a working fan
You manage rental homes and want ventilation that cannot be switched off

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.

How the job runs

Survey
Specify
Fit
Commission
Record

Towns we cover in County Durham

Questions about continuous extract fans (dMEV) in County Durham

Which towns in County Durham do you cover?

All of County Durham, including Stanley, Consett, Darlington, Hartlepool and Stockton-on-Tees. If your town is not listed, send the postcode and we will confirm.

Is it expensive to run a fan all the time?

No. dMEV fans use very little electricity on trickle speed, typically a few watts, so running costs are low compared with the condensation and mould they prevent.

Are continuous fans noisy?

A correctly sized dMEV fan is very quiet on trickle; most people only notice it on boost. Noise usually means the wrong fan or a poor duct.

Are prices different in County Durham?

Our guide prices are adjusted by region. In County Durham 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.

Is the survey free in County Durham?

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.