Portland, Dorset
Positive input ventilation (PIV) in Portland
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Portland and DT3, DT4 and DT5.
- From £825 inc VAT per home
- Free survey
PIV is often a good fix for Portland homes with condensation on every window.
We cover Portland and the surrounding DT3, DT4 and DT5 postcodes as part of our work across Dorset. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Portland at a glance
- Town
- Portland, Dorset
- Postcode districts
- DT3, DT4 and DT5
- Nearby
- Weymouth (3 miles), Dorchester (10 miles) and Bridport (18 miles)
- Price region
- South West
- Survey
- Free survey (UK mainland)
How we approach PIV in Portland
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. Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole.
Heated PIV
A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
Guide prices in Portland
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £825–£1,450 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,025–£1,775 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £150–£305 inc VAT |
These ranges use our South West rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
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
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 Portland
What is the price of a PIV unit in Portland?
Guide prices for Portland use South West rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £825 to £1,450 inc VAT per home. We confirm a fixed price in writing before any work starts.
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.
Is the survey free in Portland?
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 Portland?
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.
Tell us whether your Portland home has a loft and we can price a PIV unit before visiting.
PIV near Portland
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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.