Ventilation for new builds, extensions and lofts in Norfolk

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 Norfolk gets a written quote before it starts and a commissioning record when it finishes. We cover Bowthorpe, East Dereham, North Walsham, Downham Market and Norwich and the villages around them.

New builds & extensions in Norfolk at a glance

Area: Norfolk
Towns listed: 11, largest Norwich
Postcode districts: NR4, NR5, NR19, NR20, NR11 and NR12
Price region: East of England
Survey: Free survey (UK mainland)

What the work involves

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.

Extensions and lofts

Extract for new bathrooms and kitchens, background ventilation for new rooms.

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.

Guide prices in Norfolk

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

These ranges use our East of England rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

Signs it is time to call us

You are adding a bathroom or kitchen in an extension or loft
You are insulating and re-windowing an existing home
A self-build with an airtightness target

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 Norfolk

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

Is the survey free in Norfolk?

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 Norfolk?

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 Norfolk do you cover?

All of Norfolk, including Bowthorpe, East Dereham, North Walsham, Downham Market and Norwich. If your town is not listed, send the postcode and we will confirm.