Airflow testing and commissioning in Derbyshire

Airflow testing measures how much air each fan or valve actually moves, using a calibrated flow hood, and records it against the required rates. It is how you prove a ventilation system works, and for new homes it is part of the building regulations.

Derbyshire 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.

Airflow testing in Derbyshire at a glance

Area: Derbyshire
Towns listed: 21, largest Derby
Postcode districts: DE21, DE1, DE21, NG20, S43 and NG19
Price region: East Midlands
Survey: Charged visit, price agreed first

How we do it

Approved Document F expects mechanical ventilation in new dwellings to be tested with a flow device that has been calibrated within the last 12 months, and the results recorded on a commissioning sheet. The person commissioning should be registered with a competent person scheme for ventilation or show evidence of competence; we tell you who will sign your sheet when we quote. Testing is also useful outside new builds: it shows landlords and homeowners whether existing fans meet the rates, and it is the first step in rebalancing an MVHR system that no longer feels right.

MVHR commissioning

Supply and extract at every valve measured and balanced.

Remedial advice

If a fan fails, we explain why and quote the fix.

Extract fan tests

Each fan measured and compared with the Part F rate for the room.

Guide prices in Derbyshire

Airflow testing and commissioning guide prices in Derbyshire
Work	Guide price
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£140–£290 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£240–£385 inc VAT
Rebalance and recommission an existing MVHR system (per system)	£240–£435 inc VAT

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

Signs it is time to call us

A landlord file needs proof of ventilation
After rebalancing or extending a system
Building control needs a commissioning sheet

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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

Book
Measure
Adjust
Record
Advise

Towns we cover in Derbyshire

Questions about airflow testing and commissioning in Derbyshire

Which towns in Derbyshire do you cover?

All of Derbyshire, including Chesterfield, Long Eaton, Ilkeston, Swadlincote and Staveley. If your town is not listed, send the postcode and we will confirm.

How long does it take?

Most homes take under an hour; a full MVHR balance can take two to three hours.

Can you test commercial systems?

Yes. We measure and balance commercial supply and extract systems too.

Are prices different in Derbyshire?

Our guide prices are adjusted by region. In Derbyshire we use East Midlands rates, so airflow testing and commissioning sheet for extract fans (up to 6 fans) is typically £140 to £290 inc VAT per home.

Is the survey free in Derbyshire?

This is a charged visit because it is servicing, testing or repair work. We tell you the cost before booking. Surveys for new installations on the UK mainland are free.