Roehampton, Greater London
Positive input ventilation (PIV) in Roehampton
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Roehampton and SW13, SW14 and SW15.
- From £950 inc VAT per home
- Free survey
For a typical Roehampton semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
Roehampton is about 104 miles from our base in Great Barr, Birmingham. We book Roehampton 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 Roehampton at a glance
- Town
- Roehampton, Greater London
- Postcode districts
- SW13, SW14 and SW15
- Nearby
- Putney (1 mile), East Sheen (1 mile) and Barnes (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Roehampton
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. Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole.
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 Roehampton
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £950–£1,675 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,200–£2,025 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £175–£355 inc VAT |
London rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.
When to get it looked at
- 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. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Roehampton
What area around Roehampton do you work in?
All of Greater London. Near Roehampton that includes Putney, East Sheen, Barnes and Mortlake.
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.
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.
Do you cover Roehampton and nearby?
Yes. We cover Roehampton and nearby places including Putney, East Sheen, Barnes and Mortlake. Send your postcode and we will confirm.
What is the price of a PIV unit in Roehampton?
Guide prices for Roehampton use London rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £950 to £1,675 inc VAT per home. We confirm a fixed price in writing before any work starts.
Send a photo of your loft hatch area and landing ceiling for a quicker Roehampton quote.
PIV near Roehampton
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