Ventilation for new builds, extensions and lofts in County Londonderry

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 County Londonderry, including Derry, Coleraine and Limavady. Prices use Northern Ireland rates. Visits here are by arrangement: we quote travel separately and in writing before you commit.

New builds & extensions in County Londonderry at a glance

Area: County Londonderry, Northern Ireland
Towns listed: 3, largest Derry
Postcode districts: BT48, BT52, BT55, BT49 and BT47
Price region: Northern Ireland
Survey: By arrangement, travel quoted first

What ventilation for new builds, extensions and lofts 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.

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.

Commissioning only

Testing and paperwork for systems installed by others.

Guide prices in County Londonderry

Ventilation for new builds, extensions and lofts guide prices in County Londonderry
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

Guide prices using Northern Ireland rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first. Travel is quoted separately for this area.

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 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 Londonderry

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

Which rules apply to ventilation in County Londonderry?

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 Londonderry do you cover?

All of County Londonderry, including Derry, Coleraine and Limavady. If your town is not listed, send the postcode and we will confirm.

Are prices different in County Londonderry?

Our guide prices are adjusted by region. In County Londonderry 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.