Home ventilation, Herefordshire
Continuous extract fans (dMEV) in Herefordshire
Quiet low-energy fans that run all the time and boost automatically when humidity rises, across Herefordshire.
- From £345 inc VAT per fan
- Free survey
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.
Across Herefordshire the job is priced the same way wherever you are: what is fitted, how long it takes and how far we travel. Towns we cover include Leominster, Ross-on-Wye and Hereford.
dMEV fans in Herefordshire at a glance
- Area
- Herefordshire
- Towns listed
- 3, largest Hereford
- Postcode districts
- HR9, HR1, HR2, HR6 and GL17
- Price region
- West Midlands
- Survey
- Free survey (UK mainland)
What the work involves
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. Under Approved Document F, continuous mechanical extract systems need commissioning: the airflow on both trickle and boost is measured and recorded.
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 Herefordshire
| Work | Guide price |
|---|---|
| Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan) | £345–£595 inc VAT |
| Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home) | £145–£295 inc VAT |
These ranges use our West Midlands rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
When to get it looked at
- 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. 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 Herefordshire
Questions about continuous extract fans (dMEV) in Herefordshire
Which towns in Herefordshire do you cover?
All of Herefordshire, including Leominster, Ross-on-Wye and Hereford. 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 Herefordshire?
Our guide prices are adjusted by region. In Herefordshire we use West Midlands rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £345 to £595 inc VAT per fan.
Is the survey free in Herefordshire?
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.
Other services in Herefordshire
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