Continuous extract fans (dMEV) in North Yorkshire

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.

Our team is based in Great Barr, Birmingham, and we work throughout North Yorkshire, from Redcar, Selby, Thornaby-on-Tees, Yarm and York. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

dMEV fans in North Yorkshire at a glance

Area: North Yorkshire
Towns listed: 18, largest York
Postcode districts: TS12, DL6, DL7, HG4, HG1 and HG2
Price region: Yorkshire
Survey: Free survey (UK mainland)

What continuous extract fans (dMEV) 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 North Yorkshire

Continuous extract fans (dMEV) guide prices in North Yorkshire
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£325–£550 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£135–£275 inc VAT

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

Common reasons people call

Mould keeps returning in a bathroom with a working fan
You manage rental homes and want ventilation that cannot be switched off
You are refurbishing several wet rooms at once

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 North Yorkshire

Questions about continuous extract fans (dMEV) in North Yorkshire

Which rules apply to ventilation in North Yorkshire?

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.

What is the difference between dMEV and MEV?

dMEV uses one small fan in each wet room. MEV uses one central fan, usually in the loft, ducted to all the wet rooms. Both run continuously.

Do I still need trickle vents?

Yes. With continuous extract, Approved Document F still expects background ventilators in habitable rooms so replacement air can get in.

Which towns in North Yorkshire do you cover?

All of North Yorkshire, including Redcar, Selby, Thornaby-on-Tees, Yarm and York. If your town is not listed, send the postcode and we will confirm.

Are prices different in North Yorkshire?

Our guide prices are adjusted by region. In North Yorkshire we use Yorkshire rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £325 to £550 inc VAT per fan.