Ask for preparation instructions for your particular assessment. There is no single window-opening or cleaning rule that fits every test.
Get the instructions before the appointment
Ask whether the visit is intended to look at ordinary day-to-day conditions or a specific situation, such as after agreed treatment. Then ask what that means for cleaning, windows, heating, ventilation and occupancy.
Do not switch off safety equipment or ignore a known hazard to preserve “normal conditions”. Tell the assessor if the room’s use has changed so they can decide how to proceed.
Put together a short room history
A few dated notes are enough. There is no need for a long report of your own.
- When you first noticed the issue and where it is most noticeable.
- Times of day or activities associated with it.
- Recent painting, flooring, furniture, cleaning or building work.
- Leaks, water damage, previous treatment and any available reports.
- Usual room occupancy and how windows or ventilation are normally used.
Mention anything unusual on the day
For ventilation assessments, HSE explains that CO₂ readings need context, including how many people are present and where the monitor is placed. Tell the assessor if the room is unusually empty, a window has just been opened or a normally running system is off. Their workplace guidance illustrates why recording conditions matters.
Arrange access without disturbing affected materials
Agree the rooms needed, approximate visit duration and whether someone should stay to explain the history. Mention locked rooms, pets or access restrictions in advance. If moving a heavy item or disturbing a damaged surface would be necessary, leave that for discussion rather than doing it yourself.
Keep previous reports and photographs ready to show. Avoid sending unrelated personal documents; the property history is what matters for planning the visit.
Before the assessor leaves
Confirm when to expect findings and who to contact with questions. Ask whether laboratory work is still outstanding, whether a follow-up is included and what the next decision will be.
If you are arranging a visit through EMS, include the purpose of the assessment in your enquiry. We can discuss the scope and preparation together. A normal-looking room is not the goal of the visit; a useful answer to your concern is.
Have a question about your property?
Read about our indoor air quality testing service or tell us what you need assessed. Include your postcode and a short description of the issue.
Ask EMS about this servicePrefer to talk? 07511 130355