St Helens, Merseyside
Positive input ventilation (PIV) in St Helens
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering St Helens and WA9, WA10 and WA11.
- From £750 inc VAT per home
- Free survey
If your St Helens flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
Customers in St Helens can get a guide price online in a couple of minutes. It uses North West rates, which is what we would charge for the same job anywhere in Merseyside. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in St Helens at a glance
- Town
- St Helens, Merseyside
- Postcode districts
- WA9, WA10 and WA11
- Nearby
- Haydock (2 miles), Rainhill (3 miles) and Whiston (3 miles)
- Price region
- North West
- Survey
- Free survey (UK mainland)
How we approach PIV in St Helens
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.
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 St Helens
| 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 |
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.
Signs it is time to call us
- You have no loft but still need whole-flat ventilation (wall unit)
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
Rules that apply 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.
Questions from St Helens
What is the price of a PIV unit in St Helens?
Guide prices for St Helens use North West rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £750 to £1,325 inc VAT per home. We confirm a fixed price in writing before any work starts.
How much does PIV cost to run?
A standard PIV unit uses very little electricity, comparable to a low-energy light bulb on normal speed. A heated unit costs more in cold spells because the heater switches on when loft air is cold.
Will PIV make my house cold?
Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.
Is the survey free in St Helens?
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.
How do I get a price for a PIV unit in St Helens?
Use the guide price tool, the form on this page, live chat, WhatsApp or call 0800 088 6341. A postcode and a couple of photos help us give you a useful answer first time.
Get a PIV guide price for your St Helens home online, then confirm it on a free survey.
PIV near St Helens
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