Lee, Greater London
Positive input ventilation (PIV) in Lee
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Lee and SE3, SE12 and SE13.
- From £950 inc VAT per home
- Free survey
If your Lee flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
Whether the property is in the middle of Lee 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 Lee at a glance
- Town
- Lee, Greater London
- Postcode districts
- SE3, SE12 and SE13
- Nearby
- Blackheath (1 mile), Ladywell (1 mile) and Kidbrooke (1 mile)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Lee
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.
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 Lee
| 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.
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
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 Lee
How do I get a price for a PIV unit in Lee?
Use the guide price tool, the form on this page, live chat, WhatsApp or call 0800 088 6341. A postcode and a couple of photos help us give you a useful answer first time.
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.
What area around Lee do you work in?
All of Greater London. Near Lee that includes Blackheath, Ladywell, Kidbrooke and Catford.
Do you cover Lee and nearby?
Yes. We cover Lee and nearby places including Blackheath, Ladywell, Kidbrooke and Catford. Send your postcode and we will confirm.
Tell us whether your Lee home has a loft and we can price a PIV unit before visiting.
PIV near Lee
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Answer a few questions for a price range, or send photos and we will come back to you with a written quote.