Ventilation for new builds, extensions and lofts in Wiltshire

New homes, extensions and loft conversions need ventilation that meets the building regulations and is tested before sign-off. We design the system, install it at the right stage of the build, measure the airflows and provide the commissioning information building control asks for.

We carry out ventilation for new builds, extensions and lofts across Wiltshire, including Calne, Westbury, Swindon, Salisbury and Trowbridge. Prices use South West rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

New builds & extensions in Wiltshire at a glance

Area: Wiltshire
Towns listed: 14, largest Swindon
Postcode districts: SP1, SP2, BA13, BA14, SN13 and SN14
Price region: South West
Survey: Free survey (UK mainland)

What ventilation for new builds, extensions and lofts involves

For new dwellings in England, Approved Document F sets whole-home ventilation rates and requires mechanical systems to be commissioned and the results given to building control. Extensions and loft conversions have their own triggers: a new wet room needs extract, a new habitable room needs background ventilation or a connection to the ducted system, and energy-efficiency work can mean the existing home needs more ventilation too. We work for self-builders, small developers, builders and architects.

MVHR for new builds

Design, first fix, second fix and commissioning for whole-home heat recovery.

MEV or dMEV

Continuous extract systems where MVHR is not specified.

Extensions and lofts

Extract for new bathrooms and kitchens, background ventilation for new rooms.

Guide prices in Wiltshire

Ventilation for new builds, extensions and lofts guide prices in Wiltshire
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£5,150–£8,250 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£360–£625 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£150–£305 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£255–£410 inc VAT

Guide prices using South West rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

A self-build with an airtightness target
Ceilings are about to be boarded
Building control has asked for a ventilation strategy or commissioning sheet

Rules 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.

How the job runs

Drawings
Design
First fix
Second fix
Commission

Towns we cover in Wiltshire

Questions about ventilation for new builds, extensions and lofts in Wiltshire

Which towns in Wiltshire do you cover?

All of Wiltshire, including Calne, Westbury, Swindon, Salisbury and Trowbridge. If your town is not listed, send the postcode and we will confirm.

When should MVHR be fitted in a new build?

MVHR ducts should go in at first fix, after the structure and before plasterboard. Planning it at design stage avoids clashes with joists and steels.

Who signs off the ventilation commissioning?

The installer measures the airflows and completes a commissioning sheet, which goes to building control; for new dwellings in England that is expected within five days of completion of the commissioning.

Are prices different in Wiltshire?

Our guide prices are adjusted by region. In Wiltshire we use South West rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £5,150 to £8,250 inc VAT per home.

Is the survey free in Wiltshire?

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.