Ventilation for new builds, extensions and lofts in County Down

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.

Our team is based in Great Barr, Birmingham, and we work throughout County Down, from Newtownards, Newry, Banbridge, Dundonald and Holywood. Because of the travel involved, visits here are by arrangement and travel is quoted before booking.

New builds & extensions in County Down at a glance

Area: County Down, Northern Ireland
Towns listed: 8, largest Bangor
Postcode districts: BT35, BT32, BT63, BT4, BT5 and BT3
Price region: Northern Ireland
Survey: By arrangement, travel quoted first

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.

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 County Down

Ventilation for new builds, extensions and lofts guide prices in County Down
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£4,550–£7,300 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£315–£550 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£135–£270 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£225–£365 inc VAT

Northern Ireland rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job. Travel is quoted separately for this area.

Signs it is time to call us

You are insulating and re-windowing an existing home
A self-build with an airtightness target
Ceilings are about to be boarded

Rules in Northern Ireland

In Northern Ireland, ventilation is covered by the Building Regulations (Northern Ireland) and Technical Booklet K. Extract rates follow the Northern Ireland guidance and are measured at handover.

How the job runs

Drawings
Design
First fix
Second fix
Commission

Towns we cover in County Down

Questions about ventilation for new builds, extensions and lofts in County Down

Which rules apply to ventilation in County Down?

In Northern Ireland, ventilation is covered by Technical Booklet K of the Building Regulations (Northern Ireland). Workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993.

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.

Which towns in County Down do you cover?

All of County Down, including Newtownards, Newry, Banbridge, Dundonald and Holywood. If your town is not listed, send the postcode and we will confirm.

Are prices different in County Down?

Our guide prices are adjusted by region. In County Down we use Northern Ireland rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £4,550 to £7,300 inc VAT per home.