Home ventilation, Gwynedd and Anglesey
Positive input ventilation (PIV) in Gwynedd and Anglesey
Loft or wall units that gently push filtered air into the home to tackle condensation, across Gwynedd and Anglesey.
- From £750 inc VAT per home
- Free survey
For a typical Gwynedd and Anglesey semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
Across Gwynedd and Anglesey 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 Holyhead and Bangor.
PIV in Gwynedd and Anglesey at a glance
- Area
- Gwynedd and Anglesey, Wales
- Towns listed
- 2, largest Bangor
- Postcode districts
- LL58, LL65 and LL57
- Price region
- Wales
- Survey
- Free survey (UK mainland)
What the work involves
Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole. PIV works well in houses and flats with general condensation on windows and cold walls. It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source.
Loft-mounted PIV
The most common option for houses with a loft. Usually fitted in half a day.
Heated PIV
A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
Guide prices in Gwynedd and Anglesey
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £750–£1,325 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £950–£1,600 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £140–£280 inc VAT |
These ranges use our Wales rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Common reasons people call
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
Rules in Wales
In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. Extract rates and commissioning are checked against the Welsh guidance on every job.
How the job runs
- Survey
- Fixed quote
- Install
- Set up
- Hand over
Towns we cover in Gwynedd and Anglesey
Questions about positive input ventilation (PIV) in Gwynedd and Anglesey
Which rules apply to ventilation in Gwynedd and Anglesey?
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.
Can PIV be fitted in a flat?
Yes. Flats without loft space use a wall-mounted PIV unit that draws air from outside through an outside wall.
How long does PIV installation take?
A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.
Which towns in Gwynedd and Anglesey do you cover?
All of Gwynedd and Anglesey, including Holyhead and Bangor. If your town is not listed, send the postcode and we will confirm.
Are prices different in Gwynedd and Anglesey?
Our guide prices are adjusted by region. In Gwynedd and Anglesey we use Wales rates, so positive input ventilation (PIV) loft unit, supplied and fitted is typically £750 to £1,325 inc VAT per home.
Send a photo of your loft hatch area and landing ceiling for a quicker Gwynedd and Anglesey quote.
Other services in Gwynedd and Anglesey
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.