Ventilation for new builds, extensions and lofts in Cambridgeshire

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 Cambridgeshire, including Ely, St Ives, Peterborough, Cambridge and Wisbech. Prices use East of England rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

New builds & extensions in Cambridgeshire at a glance

Area: Cambridgeshire
Towns listed: 10, largest Peterborough
Postcode districts: PE27, PE28, PE15, CB6, CB7 and CB24
Price region: East of England
Survey: Free survey (UK mainland)

What ventilation for new builds, extensions and lofts involves

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.

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 Cambridgeshire

Ventilation for new builds, extensions and lofts guide prices in Cambridgeshire
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£5,200–£8,350 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£360–£625 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£150–£310 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£255–£415 inc VAT

Guide prices using East of England rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

Your SAP assessor has assumed a particular ventilation system
You are adding a bathroom or kitchen in an extension or loft
You are insulating and re-windowing an existing home

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 Cambridgeshire

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

Which rules apply to ventilation in Cambridgeshire?

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.

When should MVHR be fitted in a new build?

MVHR ducts should go in at first fix, after the structure and before plasterboard. Planning it at design stage avoids clashes with joists and steels.

Who signs off the ventilation commissioning?

The installer measures the airflows and completes a commissioning sheet, which goes to building control; for new dwellings in England that is expected within five days of completion of the commissioning.

Which towns in Cambridgeshire do you cover?

All of Cambridgeshire, including Ely, St Ives, Peterborough, Cambridge and Wisbech. If your town is not listed, send the postcode and we will confirm.

Are prices different in Cambridgeshire?

Our guide prices are adjusted by region. In Cambridgeshire we use East of England rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £5,200 to £8,350 inc VAT per home.