Portswood, Hampshire
Positive input ventilation (PIV) in Portswood
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Portswood and SO14, SO17 and SO18.
- From £875 inc VAT per home
- Free survey
We fit loft and wall-mounted PIV units across Portswood, after checking the house first.
For positive input ventilation (PIV) in Portswood, 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 Portswood at a glance
- Town
- Portswood, Hampshire
- Postcode districts
- SO14, SO17 and SO18
- Nearby
- Southampton (2 miles), Woolston (2 miles) and Eastleigh (3 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
How we approach PIV in Portswood
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.
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.
Guide prices in Portswood
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £875–£1,525 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,100–£1,875 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £160–£325 inc VAT |
These ranges use our South East rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Common reasons people call
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
Rules that apply in England
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Portswood
What area around Portswood do you work in?
All of Hampshire. Near Portswood that includes Southampton, Woolston, Eastleigh and Bishopstoke.
How much does PIV cost to install?
A loft-mounted PIV unit usually costs £795 to £1,395 including VAT supplied and fitted, and £995 to £1,695 for a wall-mounted unit in a flat. A heater module adds around £145 to £295.
Does PIV really stop condensation?
PIV reduces condensation in most homes because it dilutes moist air and keeps it moving, but it works best alongside working extract fans in the kitchen and bathroom. Leaks, rising damp or a cold bridge need fixing separately.
Do you cover Portswood and nearby?
Yes. We cover Portswood and nearby places including Southampton, Woolston, Eastleigh and Bishopstoke. Send your postcode and we will confirm.
What is the price of a PIV unit in Portswood?
Guide prices for Portswood use South East rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home. We confirm a fixed price in writing before any work starts.
Book a free Portswood survey and we will say honestly whether PIV, extract fans or both are needed.
PIV near Portswood
More services in Portswood
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.