Ventilation for new builds, extensions and lofts in County Durham

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 Durham, including Darlington, Hartlepool, Stockton-on-Tees, Durham and Chester-le-Street. Prices use North East 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 County Durham at a glance

Area: County Durham
Towns listed: 14, largest Darlington
Postcode districts: SR2, SR3, SR8, TS27, DL14 and DL16
Price region: North East
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.

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 County Durham

Ventilation for new builds, extensions and lofts guide prices in County Durham
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 North East 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

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

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 County Durham

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

Is the survey free in County Durham?

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 County Durham?

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 County Durham do you cover?

All of County Durham, including Darlington, Hartlepool, Stockton-on-Tees, Durham and Chester-le-Street. If your town is not listed, send the postcode and we will confirm.