Indoor air quality surveys in Gwynedd and Anglesey

An indoor air quality survey measures how fresh and how damp the air in a building really is, over days rather than minutes. We place loggers that record CO2, humidity and temperature (and particulates in workplaces), then explain what the readings mean and what ventilation changes would help.

Every job in Gwynedd and Anglesey gets a written quote before it starts and a commissioning record when it finishes. We cover Holyhead and Bangor and the villages around them.

Air quality surveys 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 indoor air quality surveys involves

CO2 is a practical indicator of whether a room is getting enough fresh air for the number of people in it: levels that climb steadily through a meeting or a night in a bedroom point to under-ventilation. Humidity readings show whether moisture is being removed or lingering long enough to cause condensation and mould. Surveys are useful before spending money: they show whether a problem is constant or happens at particular times, which rooms are worst, and whether an existing system is doing its job.

Workplace survey

CO2, humidity, temperature and particulates in offices, classrooms or meeting rooms.

Before and after

Readings taken before and after a ventilation upgrade to show the difference.

Spot checks

Readings taken during a single visit, where a quick answer is enough.

Guide prices in Gwynedd and Anglesey

Indoor air quality surveys guide prices in Gwynedd and Anglesey
Work	Guide price
Home air quality check: CO2, humidity and temperature logged for 7 days (per home)	£140–£235 inc VAT
Workplace air quality survey: CO2, PM2.5, humidity, 7 days logged, written report (per survey)	£470–£1,125 + VAT

Guide prices using Wales rates. Home prices include VAT at 20%; business prices exclude VAT. A guide price is not a quote: we confirm a fixed price in writing first.

Common reasons people call

Staff complaints about stuffiness
A new ventilation system that does not feel right
A bedroom that feels stale in the morning

Rules in Wales

In Wales, ventilation follows the Welsh Approved Document F rather than the English version, with building control checking notifiable work. Employers in Wales also have the Workplace Regulations 1992 duty to ventilate enclosed workplaces.

How the job runs

Plan
Place loggers
Log
Analyse
Report

Towns we cover in Gwynedd and Anglesey

Questions about indoor air quality surveys 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 home air quality check: CO2, humidity and temperature logged for 7 days is typically £140 to £235 inc VAT per home.

How long do the loggers stay?

Usually around 7 days, so the readings cover normal weekday and weekend use.

Will you sell me a system after the survey?

Only if the readings show you need one. The report sets out the cheapest effective options.

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.