Airflow testing and commissioning in Cornwall

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.

Cornwall 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 Cornwall at a glance

Area: Cornwall
Towns listed: 10, largest Redruth
Postcode districts: TR3, TR10, PL24, PL25, TR1 and TR3
Price region: South West
Survey: Charged visit, price agreed first

What airflow testing and commissioning involves

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.

Extract fan tests

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

MEV and dMEV commissioning

Trickle and boost rates measured and set.

MVHR commissioning

Supply and extract at every valve measured and balanced.

Guide prices in Cornwall

Airflow testing and commissioning guide prices in Cornwall
Work	Guide price
Airflow testing and commissioning sheet for extract fans (up to 6 fans) (per home)	£150–£305 inc VAT
MVHR or MEV commissioning test, every terminal measured and recorded (per system)	£255–£410 inc VAT
Rebalance and recommission an existing MVHR system (per system)	£255–£465 inc VAT

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

Signs it is time to call us

After MVHR or MEV installation by another company
A landlord file needs proof of ventilation
After rebalancing or extending a 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

Book
Measure
Adjust
Record
Advise

Towns we cover in Cornwall

Questions about airflow testing and commissioning in Cornwall

Which rules apply to ventilation in Cornwall?

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.

Can you test commercial systems?

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

How much does ventilation airflow testing cost?

Testing up to six extract fans costs £145 to £295 including VAT, and commissioning a full MVHR or MEV system £245 to £395.

Which towns in Cornwall do you cover?

All of Cornwall, including Penzance, Bodmin, Redruth, Falmouth and St Austell. If your town is not listed, send the postcode and we will confirm.

Are prices different in Cornwall?

Our guide prices are adjusted by region. In Cornwall we use South West rates, so airflow testing and commissioning sheet for extract fans (up to 6 fans) is typically £150 to £305 inc VAT per home.