Chorleywood, Hertfordshire
Positive input ventilation (PIV) in Chorleywood
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Chorleywood and HP6, HP8 and WD3.
- From £825 inc VAT per home
- Free survey
If your Chorleywood flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
For positive input ventilation (PIV) in Chorleywood, send us the postcode, a few photos and a rough idea of the rooms involved. We will tell you what we would fit and roughly what it costs before arranging a visit.
PIV in Chorleywood at a glance
- Town
- Chorleywood, Hertfordshire
- Postcode districts
- HP6, HP8 and WD3
- Nearby
- Rickmansworth (2 miles), Batchworth (3 miles) and Croxley Green (3 miles)
- Price region
- East of England
- Survey
- Free survey (UK mainland)
How we approach PIV in Chorleywood
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 Chorleywood
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £825–£1,475 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,050–£1,775 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £150–£310 inc VAT |
Guide prices using East of England 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
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
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 Chorleywood
Do you cover Chorleywood and nearby?
Yes. We cover Chorleywood and nearby places including Rickmansworth, Batchworth, Croxley Green and Chalfont St Peter. Send your postcode and we will confirm.
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.
What is the price of a PIV unit in Chorleywood?
Guide prices for Chorleywood use East of England rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £825 to £1,475 inc VAT per home. We confirm a fixed price in writing before any work starts.
Is the survey free in Chorleywood?
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.
We will check the existing fans in your Chorleywood home at the same visit, because PIV works best with them working.
PIV near Chorleywood
More services in Chorleywood
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.