Airflow testing and commissioning in Wiltshire

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.

If you are anywhere in Wiltshire, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Swindon, Salisbury, Trowbridge, Chippenham and Melksham.

Airflow testing in Wiltshire at a glance

Area: Wiltshire
Towns listed: 14, largest Swindon
Postcode districts: SP9, SN1, SN4, SP4, SN1 and SN2
Price region: South West
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.

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.

MEV and dMEV commissioning

Trickle and boost rates measured and set.

Guide prices in Wiltshire

Airflow testing and commissioning guide prices in Wiltshire
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

South 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

After rebalancing or extending a system
Building control needs a commissioning sheet
You are selling a new build and the paperwork is missing

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 Wiltshire

Questions about airflow testing and commissioning in Wiltshire

Which rules apply to ventilation in Wiltshire?

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.

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.

What equipment is used?

A flow hood that fits over the fan or valve and measures airflow in litres a second, calibrated within the last 12 months.

Which towns in Wiltshire do you cover?

All of Wiltshire, including Swindon, Salisbury, Trowbridge, Chippenham and Melksham. If your town is not listed, send the postcode and we will confirm.

Are prices different in Wiltshire?

Our guide prices are adjusted by region. In Wiltshire 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.