Home ventilation, Bristol
Continuous extract fans (dMEV) in Bristol
Quiet low-energy fans that run all the time and boost automatically when humidity rises, across Bristol.
- From £360 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.
Bristol has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.
dMEV fans in Bristol at a glance
- Area
- Bristol
- Towns listed
- 1, largest Bristol
- Postcode districts
- BS1 and BS10
- Price region
- South West
- Survey
- Free survey (UK mainland)
What the work 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.
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 Bristol
| Work | Guide price |
|---|---|
| Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan) | £360–£625 inc VAT |
| Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home) | £150–£305 inc VAT |
These ranges use our South West rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Common reasons people call
- 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
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 Bristol
Questions about continuous extract fans (dMEV) in Bristol
Is the survey free in Bristol?
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.
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 rules apply to ventilation in Bristol?
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.
Which towns in Bristol do you cover?
All of Bristol, including Bristol. If your town is not listed, send the postcode and we will confirm.
Other services in Bristol
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