Managing TM44 Compliance Across Multiple Buildings: A Guide for Facilities and Property Managers

Managing TM44 compliance for a single building can be straightforward. But for a portfolio of offices, retail sites, warehouses, and other non-domestic properties, keeping track of which systems need inspecting, who is responsible, and when each report expires can be much more difficult.

The challenge isn’t just arranging individual inspections for each property – you also need a reliable view of your buildings, air conditioning systems, inspection dates, report records, and outstanding actions so that a missed deadline at one site doesn’t create a wider compliance issue.

In this guide, we’ll explain TM44 compliance for multiple buildings, what to check when assessing your air conditioning assets, and how a centralised approach backed by the support of a compliance specialist like ACI Reports can make commercial property portfolio management much easier.

Managing TM44 Compliance Across a Large Property Portfolio

For a single site, it’s relatively easy to know which air conditioning systems are installed, when they were last inspected, and who needs to arrange the next assessment. Add 50, 100, or 1,000 properties and the same responsibilities can become fragmented between facilities teams, property managers, landlords, tenants, maintenance contractors, and individual site contacts.

The legal duty for TM44 compliance ultimately sits with the relevant person responsible for the operation of the air conditioning system. In England and Wales, all systems with an effective rated output of more than 12kW must be inspected by an accredited energy assessor at intervals of no more than five years.

For portfolio managers, that means multi-site TM44 compliance needs visibility at the estate level. You need to know which buildings are in scope, what systems they contain, when inspections were completed, when reports expire, and whether recommendations have been passed to the appropriate person for action.

Why Is TM44 Compliance Complicated Across Multiple Buildings?

Every property can have a different air conditioning setup, ownership structure, maintenance arrangement, and inspection history. Some buildings may have a single central system, while others may have numerous individual units serving different areas or tenants.

Portfolio changes can add another layer of complexity. Properties can change hands, tenants can install or alter equipment, buildings can be refurbished, and responsibility for operating systems can move between landlords, occupiers, and facilities management providers.

Without a central record, these changes can leave gaps in TM44 compliance information. A report may exist at site level but not be visible to the person managing the wider portfolio, or a system may have changed since the previous inspection without the central asset information being updated.

Simplifying TM44 Compliance for Large Portfolios

The following steps provide a practical framework for managing TM44 compliance across multiple properties. A specialist TM44 provider like ACI Reports can also help you establish and maintain this information, particularly where you have a large or geographically dispersed estate.

Step 1: Know Which Buildings and Systems Need Inspection

Start by identifying the air conditioning systems installed in every relevant property. TM44 inspection requirements apply to systems with an effective rated output of more than 12kW. This rule applies to the total cooling capacity managed by a person in a building, which means that several smaller units under 12kW must be added together.

For each property, you should establish:

• The number and type of air conditioning units or systems
• The effective rated output of the relevant systems
• Which units are linked or under common control
• Who controls the operation of each system
• Whether a current inspection report exists
• The date of the last inspection and report expiry

If information is missing, don't assume a building is outside scope because its individual units appear to be below 12kW. Government guidance recommends determining the installed capacity through appropriate inspection, calculation, and enquiries where it isn't clear whether the threshold has been reached.

Step 2: Build a Central TM44 Compliance Register

Once you've established which properties and systems are in scope, bring the information together in a central TM44 compliance register. This gives facilities managers, property managers, estates teams, and other responsible stakeholders a single source of information for the whole portfolio.

Your register should capture enough information to answer the key compliance questions quickly, including:

• Property address and site reference
• Building owner, occupier, or relevant responsible party
• Air conditioning system details and effective rated output
• Person responsible for operating each system
• Accredited assessor used
• Inspection date
• Report reference number
• Report expiry or next inspection date
• Any relevant actions or recommendations
• Current status

The exact format can depend on the size and structure of your estate. The important thing is that the information remains accurate, accessible, and useful to the people responsible for arranging inspections and managing the resulting actions.

Step 3: Track Renewal Dates Before They Become Urgent

TM44 inspections are legally required every five years, so renewal dates should form part of your planned compliance programme. For commercial property portfolio management, a central register can highlight upcoming renewals across the estate, allowing you to group inspections, plan site access, and give teams enough time to deal with any issues that could affect delivery.

It's also worth keeping copies of previous reports and supporting information together. Government guidance recommends retaining the signed air conditioning inspection report and other relevant building records, as they can provide useful information for future inspections and may reduce the time needed to gather information again.

Step 4: Keep Your Register Updated When Buildings Change

Your TM44 compliance register should be treated as a live portfolio record, and not something you update only when an inspection is due. Changes to buildings, tenants, air conditioning systems, and operational responsibilities can all affect the information you rely on to manage compliance.

Make it part of your normal commercial property portfolio management process to update your records when:

• A new property joins the portfolio
• A building is sold or transferred
• A tenant takes over or vacates a building
• Air conditioning equipment is installed, removed, or significantly altered
• Responsibility for operating a system changes
• A new TM44 inspection is completed
• Recommendations are completed or passed to another responsible party

This is particularly useful for facilities management providers working across client portfolios. Accurate asset and test registers give you better visibility of the services being managed and make it easier to provide consistent information to clients.

Step 5: Use TM44 Reports as Portfolio Data

Alongside regulatory compliance, A TM44 report can provide incredibly useful data about air conditioning system efficiency, maintenance, controls, sizing, faults, and opportunities to reduce energy consumption and operating costs.

This makes TM44 compliance a useful source of insight for wider commercial property portfolio management, helping portfolio teams identify issues and opportunities to inform maintenance, investment, and energy-efficiency priorities across the estate.

How ACI Reports Supports Multi-Site TM44 Programmes

ACI Reports supports organisations responsible for individual properties and complex portfolios across the UK, Ireland, and Europe. Our experienced energy assessors can coordinate inspections across multiple locations, helping clients bring fragmented TM44 compliance requirements into a more manageable programme.

Simplify Multi-Site TM44 Compliance With ACI Reports

Managing TM44 compliance across multiple buildings starts with knowing what you have, who is responsible for it, and when each inspection is due. A central register, accurate system information, and regular review of your TM44 reports can give property and facilities teams much greater control over portfolio-wide compliance, efficiency, and costs.

ACI Reports can support you with the practical work behind that process, from multi-site inspections and portfolio coordination to clear reporting and renewal support. Whether you're responsible for a commercial property portfolio, manage compliance for multiple clients, or oversee a national estate, our team can help make your TM44 programme easier to organise and act on.

FAQs About TM44 Compliance for Multi-Site Property Portfolios

How do you manage TM44 compliance across multiple properties?

Start with a central TM44 compliance register covering your properties, air conditioning systems, inspection dates, report expiry dates, responsible parties, and outstanding actions.

Then regularly updating this information and reviewing recommendations can help you stay ahead of renewals, identify recurring issues, and manage compliance more efficiently.

A specialist provider such as ACI Reports can also coordinate inspections and reporting across multiple sites, giving you consistent support across your portfolio.

Do multiple air conditioning units count towards the 12kW TM44 threshold?

Yes, they can. Where multiple air conditioning units are connected to form one system and are under the control of the same person, their combined effective rated output is considered when determining whether the 12kW threshold is met. You can read more about inspection requirements in our Full Guide to TM44 Regulations.

Can one TM44 inspection cover multiple buildings?

A TM44 inspection can cover air conditioning systems serving multiple buildings where they form part of the same system. Where separate systems serve separate buildings, each qualifying system will need its own inspection. If you're unsure how many inspections your portfolio requires, our team at ACI Reports can help you determine this before arranging your surveys.