Portsmouth, Hampshire
Positive input ventilation (PIV) in Portsmouth
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Portsmouth and PO1, PO2 and PO5.
- From £875 inc VAT per home
- Free survey
PIV is often a good fix for Portsmouth homes with condensation on every window.
We cover Portsmouth and the surrounding PO1, PO2 and PO5 postcodes as part of our work across Hampshire. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Portsmouth at a glance
- Town
- Portsmouth, Hampshire
- Postcode districts
- PO1, PO2 and PO5
- Nearby
- Southsea (1 mile), Gosport (2 miles) and Cosham (4 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
How we approach PIV in Portsmouth
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.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Guide prices in Portsmouth
| 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.
Signs it is time to call us
- 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 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 Portsmouth
What area around Portsmouth do you work in?
All of Hampshire. Near Portsmouth that includes Southsea, Gosport, Cosham and South Hayling.
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 Portsmouth and nearby?
Yes. We cover Portsmouth and nearby places including Southsea, Gosport, Cosham and South Hayling. Send your postcode and we will confirm.
What is the price of a PIV unit in Portsmouth?
Guide prices for Portsmouth 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.
Tell us whether your Portsmouth home has a loft and we can price a PIV unit before visiting.
PIV near Portsmouth
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