Ventilation for new builds, extensions and lofts in Greater London

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 Greater London, including Barking, Archway, Sutton, Croydon and Brent. Prices use London rates. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.

New builds & extensions in Greater London at a glance

Area: Greater London
Towns listed: 216, largest Brent
Postcode districts: SW1X, SW7, DA17, DA18, HA2 and HA4
Price region: London
Survey: Free survey (UK mainland)

How we do it

For new dwellings in England, Approved Document F sets whole-home ventilation rates and requires mechanical systems to be commissioned and the results given to building control. 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.

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 Greater London

Ventilation for new builds, extensions and lofts guide prices in Greater London
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£5,950–£9,550 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£415–£725 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£175–£355 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£295–£475 inc VAT

London 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

A self-build with an airtightness target
Ceilings are about to be boarded
Building control has asked for a ventilation strategy or commissioning sheet

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). For homes, it sets minimum extract rates such as 15 litres a second for a bathroom and 30 or 60 for a kitchen, and expects mechanical systems to be airflow-tested.

How the job runs

Drawings
Design
First fix
Second fix
Commission

Towns we cover in Greater London

Questions about ventilation for new builds, extensions and lofts in Greater London

Which towns in Greater London do you cover?

All of Greater London, including Barking, Archway, Sutton, Croydon and Brent. If your town is not listed, send the postcode and we will confirm.

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.

Do loft conversions need ventilation?

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

Are prices different in Greater London?

Our guide prices are adjusted by region. In Greater London we use London rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £5,950 to £9,550 inc VAT per home.

Is the survey free in Greater London?

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.