Harpenden, Hertfordshire
Positive input ventilation (PIV) in Harpenden
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Harpenden and AL3, AL4 and AL5.
- From £825 inc VAT per home
- Free survey
We fit loft and wall-mounted PIV units across Harpenden, after checking the house first.
Customers in Harpenden can get a guide price online in a couple of minutes. It uses East of England rates, which is what we would charge for the same job anywhere in Hertfordshire. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Harpenden at a glance
- Town
- Harpenden, Hertfordshire
- Postcode districts
- AL3, AL4 and AL5
- Nearby
- St Albans (5 miles), Luton (5 miles) and Codicote (6 miles)
- Price region
- East of England
- Survey
- Free survey (UK mainland)
PIV for Harpenden homes
It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.
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 Harpenden
| 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 |
East of England rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.
Common reasons people call
- Washing dried indoors makes everything worse
- You have no loft but still need whole-flat ventilation (wall unit)
- Streaming windows on most mornings in winter
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 Harpenden
What area around Harpenden do you work in?
All of Hertfordshire. Near Harpenden that includes St Albans, Luton, Codicote and Hemel Hempstead.
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.
Will PIV make my house cold?
Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.
Do you cover Harpenden and nearby?
Yes. We cover Harpenden and nearby places including St Albans, Luton, Codicote and Hemel Hempstead. Send your postcode and we will confirm.
What is the price of a PIV unit in Harpenden?
Guide prices for Harpenden 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.
Tell us whether your Harpenden home has a loft and we can price a PIV unit before visiting.
PIV near Harpenden
More services in Harpenden
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.