Ventilation for new builds, extensions and lofts in Oxfordshire

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.

Oxfordshire has every kind of building, from old terraces to new estates and business parks, and every job is designed around the building in front of us, not a standard kit.

New builds & extensions in Oxfordshire at a glance

Area: Oxfordshire
Towns listed: 13, largest Oxford
Postcode districts: OX25, OX10, OX11, OX8, OX28 and OX1
Price region: South East
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.

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 Oxfordshire

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

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

When to get it looked at

Ceilings are about to be boarded
Building control has asked for a ventilation strategy or commissioning sheet
Your SAP assessor has assumed a particular ventilation system

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 Oxfordshire

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

Which rules apply to ventilation in Oxfordshire?

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 Oxfordshire do you cover?

All of Oxfordshire, including Cowley, Carterton, Oxford, Banbury and Abingdon. If your town is not listed, send the postcode and we will confirm.

Are prices different in Oxfordshire?

Our guide prices are adjusted by region. In Oxfordshire 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.