New builds, extensions and testing, Gwynedd and Anglesey
Airflow testing and commissioning in Gwynedd and Anglesey
Calibrated flow-hood testing and commissioning sheets for fans, MEV and MVHR, across Gwynedd and Anglesey.
- From £140 inc VAT per home
- Charged visit, price agreed first
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.
We carry out airflow testing and commissioning across Gwynedd and Anglesey, including Holyhead and Bangor. Prices use Wales rates. Servicing, testing and repair visits are charged, and we tell you the cost before booking.
Airflow testing in Gwynedd and Anglesey at a glance
- Area
- Gwynedd and Anglesey, Wales
- Towns listed
- 2, largest Bangor
- Postcode districts
- LL57, LL58 and LL65
- Price region
- Wales
- Survey
- Charged visit, price agreed first
What airflow testing and commissioning involves
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 Gwynedd and Anglesey
| Work | Guide price |
|---|---|
| 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 |
| Rebalance and recommission an existing MVHR system (per system) | £235–£425 inc VAT |
Guide prices using Wales rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.
When to get it looked at
- You are selling a new build and the paperwork is missing
- Fans seem weak and you want evidence
- After MVHR or MEV installation by another company
Rules in Wales
In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. We design to the Welsh rates and commission mechanical systems so the results can be recorded.
How the job runs
- Book
- Measure
- Adjust
- Record
- Advise
Towns we cover in Gwynedd and Anglesey
Questions about airflow testing and commissioning in Gwynedd and Anglesey
Are prices different in Gwynedd and Anglesey?
Our guide prices are adjusted by region. In Gwynedd and Anglesey we use Wales rates, so airflow testing and commissioning sheet for extract fans (up to 6 fans) is typically £140 to £280 inc VAT per home.
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.
What happens if a fan fails the test?
We explain the likely cause, such as an undersized fan or a crushed duct, and quote to fix it. Many failures are cheap to put right.
Is the survey free in Gwynedd and Anglesey?
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.
Which rules apply to ventilation in Gwynedd and Anglesey?
In Wales, the Welsh Government's own Approved Document F (2022 edition) applies to ventilation in homes, with a new edition taking effect on 4 March 2027. Rented homes must be fit for human habitation under the Renting Homes (Wales) Act 2016, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.
Other services in Gwynedd and Anglesey
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.