Welwyn Garden City, Hertfordshire
Positive input ventilation (PIV) in Welwyn Garden City
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Welwyn Garden City and AL6, AL7 and AL8.
- From £825 inc VAT per home
- Free survey
PIV is often a good fix for Welwyn Garden City homes with condensation on every window.
Welwyn Garden City is about 89 miles from our base in Great Barr, Birmingham. We book Welwyn Garden City visits by appointment and confirm the date in writing. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Welwyn Garden City at a glance
- Town
- Welwyn Garden City, Hertfordshire
- Postcode districts
- AL6, AL7 and AL8
- Nearby
- Hatfield (3 miles), Codicote (4 miles) and Hertford (6 miles)
- Price region
- East of England
- Survey
- Free survey (UK mainland)
What the work involves
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.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Guide prices in Welwyn Garden City
| 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
- 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
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Welwyn Garden City
What area around Welwyn Garden City do you work in?
All of Hertfordshire. Near Welwyn Garden City that includes Hatfield, Codicote, Hertford and St Albans.
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.
Do you cover Welwyn Garden City and nearby?
Yes. We cover Welwyn Garden City and nearby places including Hatfield, Codicote, Hertford and St Albans. Send your postcode and we will confirm.
What is the price of a PIV unit in Welwyn Garden City?
Guide prices for Welwyn Garden City 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.
We will check the existing fans in your Welwyn Garden City home at the same visit, because PIV works best with them working.
PIV near Welwyn Garden City
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