Continuous extract fans (dMEV) in Merseyside

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 Merseyside gets a written quote before it starts and a commissioning record when it finishes. We cover Southport, Wallasey, Bootle, Bebington and Huyton and the villages around them.

dMEV fans in Merseyside at a glance

Area: Merseyside
Towns listed: 38, largest Liverpool
Postcode districts: L30, CH44, CH45, L20, L21 and CH42
Price region: North West
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.

Commissioned and recorded

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

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.

Guide prices in Merseyside

Continuous extract fans (dMEV) guide prices in Merseyside
Work	Guide price
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£330–£575 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£140–£280 inc VAT

North West 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

You manage rental homes and want ventilation that cannot be switched off
You are refurbishing several wet rooms at once
An energy retrofit has made the house more airtight

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

Survey
Specify
Fit
Commission
Record

Towns we cover in Merseyside

Questions about continuous extract fans (dMEV) in Merseyside

Which towns in Merseyside do you cover?

All of Merseyside, including Southport, Wallasey, Bootle, Bebington and Huyton. If your town is not listed, send the postcode and we will confirm.

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 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 prices different in Merseyside?

Our guide prices are adjusted by region. In Merseyside we use North West rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £330 to £575 inc VAT per fan.

Is the survey free in Merseyside?

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.