Ventilation for new builds, extensions and lofts in Kent

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 Kent, including Royal Tunbridge Wells, Folkestone, Margate, Ashford and Canterbury. Prices use South 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 Kent at a glance

Area: Kent
Towns listed: 32, largest Maidstone
Postcode districts: ME7, ME1, ME4, TN1, TN2 and CT18
Price region: South East
Survey: Free survey (UK mainland)

What ventilation for new builds, extensions and lofts 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 Kent

Ventilation for new builds, extensions and lofts guide prices in Kent
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£5,450–£8,750 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£380–£650 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£160–£325 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£270–£435 inc VAT

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

When to get it looked at

You are insulating and re-windowing an existing home
A self-build with an airtightness target
Ceilings are about to be boarded

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 Kent

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

Which rules apply to ventilation in Kent?

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.

Does an extension need extractor fans?

A new kitchen, bathroom, utility room or WC in an extension needs mechanical extract to meet Approved Document F in England, and new habitable rooms need background ventilation or a connection to a ducted system.

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.

Which towns in Kent do you cover?

All of Kent, including Royal Tunbridge Wells, Folkestone, Margate, Ashford and Canterbury. If your town is not listed, send the postcode and we will confirm.

Are prices different in Kent?

Our guide prices are adjusted by region. In Kent we use South East rates, so MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms is typically £5,450 to £8,750 inc VAT per home.