Mortlake, Greater London
Positive input ventilation (PIV) in Mortlake
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Mortlake and SW13, SW14 and TW9.
- From £950 inc VAT per home
- Free survey
We fit loft and wall-mounted PIV units across Mortlake, after checking the house first.
Customers in Mortlake can get a guide price online in a couple of minutes. It uses London rates, which is what we would charge for the same job anywhere in Greater London. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Mortlake at a glance
- Town
- Mortlake, Greater London
- Postcode districts
- SW13, SW14 and TW9
- Nearby
- East Sheen (under a mile), Barnes (1 mile) and Kew (1 mile)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole. PIV works well in houses and flats with general condensation on windows and cold walls.
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 Mortlake
| 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.
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
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 Mortlake
What area around Mortlake do you work in?
All of Greater London. Near Mortlake that includes East Sheen, Barnes, Kew and Roehampton.
How long does PIV installation take?
A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.
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.
Do you cover Mortlake and nearby?
Yes. We cover Mortlake and nearby places including East Sheen, Barnes, Kew and Roehampton. Send your postcode and we will confirm.
What is the price of a PIV unit in Mortlake?
Guide prices for Mortlake 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.
We will check the existing fans in your Mortlake home at the same visit, because PIV works best with them working.
PIV near Mortlake
More services in Mortlake
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.