For England and Wales, the statutory inspection duty generally applies to air-conditioning systems with effective rated output of more than 12 kW, including smaller units grouped where the same relevant person controls their temperatures within a building. Scotland and Northern Ireland have their own arrangements and should be scoped under the appropriate national rules.
What you need to know
- Check the actual system capacity, building boundaries and who controls technical operation before treating a visit as required.
- Share the building address, cooling equipment known, existing report and safe-access arrangements, even when the asset schedule is incomplete.
- Confirm an appropriately accredited assessor, site scope, VAT, attendance terms, report and official lodgement deliverables in writing.
- An appointment is not a certificate; retain the assessor's report and registered reference where required, and plan the next statutory inspection interval.
Step 1: Establish whether the system is in scope
Before choosing a date, determine the building's jurisdiction, rated cooling output and common technical control. A small system rated at exactly 12 kW does not, on that number alone, cross the more-than-12 kW threshold in England and Wales; several smaller qualifying units in one building may require assessment when they are under the same relevant person.
Never double-count the nameplate output of an outdoor multi-split unit and the indoor heads it serves, and do not treat electricity input or heating output as proof of effective rated cooling. Where the equipment schedule is unavailable, record the facts as UNKNOWN and ask for a properly scoped review.
Check the 12 kW requirementStep 2: Prepare a short, useful site brief
Start with the correct street address, building or floor, known cooling systems, number of plant areas, last inspection report if available, the reason for booking and the person who can discuss technical operation. A full manufacturer asset list is helpful but not essential to initiate an enquiry.
Mention multi-let occupation, server-room cooling, rooftop plant, constrained access hours, induction requirements and anything that must not be interrupted. Do not send tenant personal details, confidential building access codes or sensitive security records through unverified channels.
- Full site and building identity
- Cooling system types and genuine rated kW where known
- Last accredited TM44 report and registered reference if present
- Access contact, site limits and actual requested deadline
Step 3: Check the assessor and agree the price
A valid inspection requires an appropriately accredited air-conditioning energy assessor. Ask who is accountable for the assessment and which approved accreditation scheme applies. A maintenance contractor or booking office cannot produce a statutory report simply by offering HVAC services.
A written quotation should specify the sites and plant included, visit scope, possible additional attendance, VAT, parking or special access charges, exclusions, and who is responsible for report preparation and lodgement. Do not assume a quote automatically includes repairs, F-Gas checks or control upgrades.
Compare the actual factors affecting TM44 inspection costsStep 4: Arrange safe attendance and document access
The office and assessor need realistic access to the cooling plant and relevant controls. Arrange escorts, permitted hours, roof and plant-room entry, control-system assistance, and any site induction well before attendance. A booking may need adjustment if equipment cannot safely be examined.
A statutory energy inspection is not an equipment-isolation permit or fault-repair service. Do not promise uninterrupted access at a hospital, server room, shopping centre or busy operating site unless the relevant manager has actually authorised the planned examination.
Understand the site survey and inspection visitStep 5: Understand what happens on the visit
The accredited assessor examines accessible cooling equipment and controls, the appropriateness of operation and opportunities to improve energy performance. Specific technical work is scoped against the size, complexity and condition of the real systems; the procedure is not a simple checklist where every room receives a pass stamp.
Any suspected defects or recommendations belong in the report and may require separately competent maintenance or further investigation. The legal inspection and ordinary service tasks should remain clearly differentiated even when the same premises requires both.
The six stages from preparation to registered reportStep 6: Receive the report and verify lodgement
Government guidance says that England and Wales inspection reports produced on or after 6 April 2012 require a valid report reference created through official lodgement. A booking confirmation, invoice, unfinished PDF or arbitrary reference issued by a commercial website is not equivalent evidence.
Compare the completed report with the correct building, equipment and accredited assessor. Keep the actual inspection date, document and reference in the estate record, then plan the statutory repeat inspection at intervals not exceeding five years for qualifying systems.
How the official lodgement process worksWhat if the requested appointment is urgent?
Explain whether the deadline comes from an enforcement request, property transaction, expiring report or internal compliance review. Attendance, report preparation and government lodgement are separate milestones and none should be guaranteed within a fixed period without the assessor and site conditions being confirmed.
If a previous report is missing, search the official register and request the original reference before assuming a new inspection is the only remedy. Use the submission or contact route displayed on the enquiry page to request a scope and availability review. An enquiry does not itself confirm an inspection appointment.
Prepare an urgent and realistic inspection briefCheck the governing guidance
This article does not authenticate a government register entry or establish the status of an individual building. Confirm the applicable national framework and the actual installed equipment before relying on a compliance conclusion.
England and Wales legal points are anchored in current government publications and the regulations. Technical applicability for a specific building still requires its actual system information.