Home ventilation, Dyfed
Continuous extract fans (dMEV) in Dyfed
Quiet low-energy fans that run all the time and boost automatically when humidity rises, across Dyfed.
- 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 Dyfed, including Milford Haven, Llanelli, Ammanford, Aberystwyth and Carmarthen. Prices use Wales rates. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
dMEV fans in Dyfed at a glance
- Area
- Dyfed, Wales
- Towns listed
- 6, largest Llanelli
- Postcode districts
- SA72, SA14, SA15, SA18, SY23 and SY24
- Price region
- Wales
- Survey
- Free survey (UK mainland)
How we do it
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.
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 Dyfed
| 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 |
Wales rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.
Common reasons people call
- Building control has asked for continuous extract
- Occupants switch fans off because of noise
- Mould keeps returning in a bathroom with a working fan
Rules in Wales
In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. We design to the Welsh rates and commission mechanical systems so the results can be recorded.
How the job runs
- Survey
- Specify
- Fit
- Commission
- Record
Towns we cover in Dyfed
Questions about continuous extract fans (dMEV) in Dyfed
Are prices different in Dyfed?
Our guide prices are adjusted by region. In Dyfed we use Wales rates, so continuous-running extract fan (dMEV) with humidity boost, flow tested is typically £330 to £575 inc VAT per fan.
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.
Is the survey free in Dyfed?
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.
Which rules apply to ventilation in Dyfed?
In Wales, the Welsh Government's own Approved Document F (2022 edition) applies to ventilation in homes, with a new edition taking effect on 4 March 2027. Rented homes must be fit for human habitation under the Renting Homes (Wales) Act 2016, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.
Other services in Dyfed
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.