Ventilation for new builds, extensions and lofts in Mid 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.

Every job in Mid Glamorgan gets a written quote before it starts and a commissioning record when it finishes. We cover Tonypandy, Bridgend, Merthyr Tydfil, Coity and Pontypridd and the villages around them.

New builds & extensions in Mid Glamorgan at a glance

Area: Mid Glamorgan, Wales
Towns listed: 14, largest Rhondda
Postcode districts: CF41, CF39, CF40, CF31, CF32 and CF44
Price region: Wales
Survey: Free survey (UK mainland)

How we do it

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.

Extensions and lofts

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

Commissioning only

Testing and paperwork for systems installed by others.

MVHR for new builds

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

Guide prices in Mid Glamorgan

Ventilation for new builds, extensions and lofts guide prices in Mid 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

Wales rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

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

In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. 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 Mid Glamorgan

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

Are prices different in Mid Glamorgan?

Our guide prices are adjusted by region. In Mid 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.

How much does MVHR cost in a new build?

For a 3 to 4 bedroom new build, MVHR fitted at first fix usually costs £4,950 to £7,950 including VAT. VAT on new-build work can differ, so we confirm the treatment on your quote.

Can you just test a system someone else installed?

Yes. We can commission and test systems installed by others, and report any issues we find.

Is the survey free in Mid 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 Mid 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.