Home ventilation, Cumbria
Continuous extract fans (dMEV) in Cumbria
Quiet low-energy fans that run all the time and boost automatically when humidity rises, across Cumbria.
- From £330 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.
We carry out continuous extract fans (dMEV) across Cumbria, including Carlisle, Barrow-in-Furness, Kendal, Whitehaven and Workington. Prices use North West rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
dMEV fans in Cumbria at a glance
- Area
- Cumbria
- Towns listed
- 7, largest Carlisle
- Postcode districts
- CA1, CA2, LA13, LA14, LA8 and LA9
- Price region
- North West
- Survey
- Free survey (UK mainland)
What continuous extract fans (dMEV) 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 Cumbria
| 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 |
Guide prices using North West rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.
When to get it looked at
- An energy retrofit has made the house more airtight
- Building control has asked for continuous extract
- Occupants switch fans off because of noise
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 Cumbria
Questions about continuous extract fans (dMEV) in Cumbria
Which towns in Cumbria do you cover?
All of Cumbria, including Carlisle, Barrow-in-Furness, Kendal, Whitehaven and Workington. If your town is not listed, send the postcode and we will confirm.
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.
Are prices different in Cumbria?
Our guide prices are adjusted by region. In Cumbria 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 Cumbria?
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 Cumbria
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