Sidcup, Greater London
Positive input ventilation (PIV) in Sidcup
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Sidcup and BR7, DA14 and DA15.
- From £950 inc VAT per home
- Free survey
For a typical Sidcup semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
Whether the property is in the middle of Sidcup or one of the villages around it, the process is the same: a look at the building, a written price, then fitting and testing on the agreed day.
PIV in Sidcup at a glance
- Town
- Sidcup, Greater London
- Postcode districts
- BR7, DA14 and DA15
- Nearby
- Chislehurst (2 miles), Bexley (2 miles) and Welling (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Sidcup homes
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 Sidcup
| 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 |
Guide prices using London 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
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
- Washing dried indoors makes everything worse
Rules that apply in England
English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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 Sidcup
What area around Sidcup do you work in?
All of Greater London. Near Sidcup that includes Chislehurst, Bexley, Welling and Eltham.
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 Sidcup and nearby?
Yes. We cover Sidcup and nearby places including Chislehurst, Bexley, Welling and Eltham. Send your postcode and we will confirm.
What is the price of a PIV unit in Sidcup?
Guide prices for Sidcup 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 Sidcup quote.
PIV near Sidcup
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