Positive input ventilation (PIV) in Grays

PIV can suit Grays houses and flats because it treats the whole home from one quiet unit.

For positive input ventilation (PIV) in Grays, send us the postcode, a few photos and a rough idea of the rooms involved. We will tell you what we would fit and roughly what it costs before arranging a visit.

PIV in Grays at a glance

Town: Grays, Essex
Postcode districts: RM16, RM17 and RM20
Nearby: Chafford Hundred (2 miles), Tilbury (2 miles) and Swanscombe (2 miles)
Price region: East of England
Survey: Free survey (UK mainland)

PIV for Grays homes

Loft air is usually a little warmer and drier than outside air, and the unit filters it before it comes down into the house. Many units have a temperature sensor that reduces the flow or switches to a heater module on cold days, so the incoming air does not feel like a draught.

PIV with fan upgrades

PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.

Loft-mounted PIV

The most common option for houses with a loft. Usually fitted in half a day.

Guide prices in Grays

Positive input ventilation (PIV) guide prices in Grays
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£825–£1,475 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£1,050–£1,775 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£150–£310 inc VAT

Guide prices using East of England rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

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 Grays

Is the survey free in Grays?

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.

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.

How do I get a price for a PIV unit in Grays?

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.

What area around Grays do you work in?

All of Essex. Near Grays that includes Chafford Hundred, Tilbury, Swanscombe and South Ockendon.

Send a photo of your loft hatch area and landing ceiling for a quicker Grays quote.