Weymouth, Dorset
Positive input ventilation (PIV) in Weymouth
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Weymouth and DT3, DT4 and DT5.
- From £825 inc VAT per home
- Free survey
For a typical Weymouth semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
We cover Weymouth and the surrounding DT3, DT4 and DT5 postcodes as part of our work across Dorset. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Weymouth at a glance
- Town
- Weymouth, Dorset
- Postcode districts
- DT3, DT4 and DT5
- Nearby
- Portland (3 miles), Dorchester (7 miles) and Bridport (15 miles)
- Price region
- South West
- Survey
- Free survey (UK mainland)
How we approach PIV in Weymouth
PIV works well in houses and flats with general condensation on windows and cold walls. It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source.
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 Weymouth
| 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.
When to get it looked at
- 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. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Weymouth
Is the survey free in Weymouth?
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.
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.
How do I get a price for a PIV unit in Weymouth?
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.
What area around Weymouth do you work in?
All of Dorset. Near Weymouth that includes Portland, Dorchester, Bridport and Blandford Forum.
Most Weymouth PIV jobs are done in half a day, so ask about the next available date.
PIV near Weymouth
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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.