Ventilation for new builds, extensions and lofts in Merseyside

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 Merseyside gets a written quote before it starts and a commissioning record when it finishes. We cover Southport, Wallasey, Bootle, Bebington and Huyton and the villages around them.

New builds & extensions in Merseyside at a glance

Area: Merseyside
Towns listed: 38, largest Liverpool
Postcode districts: L21, CH42, CH62, L14, L27 and L10
Price region: North West
Survey: Free survey (UK mainland)

How we do it

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. Fitting ducts at first fix is far cheaper than retrofitting, so it pays to involve us before the ceilings go up.

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.

MEV or dMEV

Continuous extract systems where MVHR is not specified.

Guide prices in Merseyside

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

North West 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

Building control has asked for a ventilation strategy or commissioning sheet
Your SAP assessor has assumed a particular ventilation system
You are adding a bathroom or kitchen in an extension or loft

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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 Merseyside

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

Is the survey free in Merseyside?

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.

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 rules apply to ventilation in Merseyside?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Merseyside do you cover?

All of Merseyside, including Southport, Wallasey, Bootle, Bebington and Huyton. If your town is not listed, send the postcode and we will confirm.