Ventilation for new builds, extensions and lofts in South Glamorgan

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 South Glamorgan, including Whitchurch, Rhiwbina, Cardiff, Barry and Penarth. Prices use Wales rates. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

New builds & extensions in South Glamorgan at a glance

Area: South Glamorgan, Wales
Towns listed: 6, largest Cardiff
Postcode districts: CF10, CF11, CF61, CF71, CF5 and CF14
Price region: Wales
Survey: Free survey (UK mainland)

What the work involves

We work for self-builders, small developers, builders and architects. Fitting ducts at first fix is far cheaper than retrofitting, so it pays to involve us before the ceilings go up.

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 South Glamorgan

Ventilation for new builds, extensions and lofts guide prices in South Glamorgan
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£4,700–£7,550 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£330–£575 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£140–£280 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£235–£375 inc VAT

These ranges use our Wales rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

Signs it is time to call us

Ceilings are about to be boarded
Building control has asked for a ventilation strategy or commissioning sheet
Your SAP assessor has assumed a particular ventilation system

Rules in Wales

Wales has its own Part F ventilation guidance, published by the Welsh Government, and work is checked by building control. We design to the Welsh rates and commission mechanical systems so the results can be recorded.

How the job runs

Drawings
Design
First fix
Second fix
Commission

Towns we cover in South Glamorgan

Questions about ventilation for new builds, extensions and lofts in South Glamorgan

Are prices different in South Glamorgan?

Our guide prices are adjusted by region. In South Glamorgan we use Wales rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £4,700 to £7,550 inc VAT per home.

Do loft conversions need ventilation?

Yes. New bedrooms need background ventilation, and a new en-suite or bathroom needs extract to outside.

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.

Is the survey free in South Glamorgan?

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.

Which rules apply to ventilation in South Glamorgan?

In Wales, the Welsh Government's own Approved Document F (2022 edition) applies to ventilation in homes, with a new edition taking effect on 4 March 2027. Rented homes must be fit for human habitation under the Renting Homes (Wales) Act 2016, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.