Ventilation for new builds, extensions and lofts in Lancashire

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.

If you are anywhere in Lancashire, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Blackburn, Blackpool, Rossendale, Morecambe and Lancaster.

New builds & extensions in Lancashire at a glance

Area: Lancashire
Towns listed: 29, largest Preston
Postcode districts: BB4, BB5, FY2, FY5, BB6 and BB7
Price region: North West
Survey: Free survey (UK mainland)

How we do it

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.

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.

MEV or dMEV

Continuous extract systems where MVHR is not specified.

Guide prices in Lancashire

Ventilation for new builds, extensions and lofts guide prices in Lancashire
Work	Guide price
MVHR in a new build or full renovation (fitted at first fix), 3 to 4 bedrooms (per home)	£4,700–£7,550 inc VAT
Continuous-running extract fan (dMEV) with humidity boost, flow tested (per fan)	£330–£575 inc VAT
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£140–£280 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£235–£375 inc VAT

North West rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

When to get it looked at

A self-build with an airtightness target
Ceilings are about to be boarded
Building control has asked for a ventilation strategy or commissioning sheet

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 Lancashire

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

Is the survey free in Lancashire?

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.

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.

Do loft conversions need ventilation?

Yes. New bedrooms need background ventilation, and a new en-suite or bathroom needs extract to outside.

Which rules apply to ventilation in Lancashire?

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 Lancashire do you cover?

All of Lancashire, including Blackburn, Blackpool, Rossendale, Morecambe and Lancaster. If your town is not listed, send the postcode and we will confirm.