Southampton, Hampshire
Positive input ventilation (PIV) in Southampton
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Southampton and SO14, SO15 and SO17.
- From £875 inc VAT per home
- Free survey
Condensation in Southampton homes usually has one of two answers: better extract fans, or PIV as well.
Southampton is about 116 miles from our base in Great Barr, Birmingham. We book Southampton visits by appointment and confirm the date in writing. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Southampton at a glance
- Town
- Southampton, Hampshire
- Postcode districts
- SO14, SO15 and SO17
- Nearby
- Woolston (1 mile), Portswood (2 miles) and Hythe (3 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
PIV for Southampton homes
It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.
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 Southampton
| 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 |
Guide prices using South East rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.
When to get it looked at
- 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). 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 Southampton
What area around Southampton do you work in?
All of Hampshire. Near Southampton that includes Woolston, Portswood, Hythe and Totton.
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.
Do you cover Southampton and nearby?
Yes. We cover Southampton and nearby places including Woolston, Portswood, Hythe and Totton. Send your postcode and we will confirm.
What is the price of a PIV unit in Southampton?
Guide prices for Southampton 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 Southampton survey and we will say honestly whether PIV, extract fans or both are needed.
PIV near Southampton
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