Lewes, East Sussex
Positive input ventilation (PIV) in Lewes
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Lewes and BN7, BN8 and BN10.
- From £875 inc VAT per home
- Free survey
If your Lewes flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
Customers in Lewes can get a guide price online in a couple of minutes. It uses South East rates, which is what we would charge for the same job anywhere in East Sussex. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Lewes at a glance
- Town
- Lewes, East Sussex
- Postcode districts
- BN7, BN8 and BN10
- Nearby
- Rottingdean (5 miles), Peacehaven (6 miles) and Newhaven (6 miles)
- Price region
- South East
- 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.
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 Lewes
| 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 |
South East rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.
Signs it is time to call us
- 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. 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 Lewes
What is the price of a PIV unit in Lewes?
Guide prices for Lewes 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.
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.
Is the survey free in Lewes?
For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.
How do I get a price for a PIV unit in Lewes?
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.
We will check the existing fans in your Lewes home at the same visit, because PIV works best with them working.
PIV near Lewes
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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.