With the UK experiencing another exceptionally warm summer, many businesses may be considering whether air conditioning is becoming a necessity rather than a luxury.

The Met Office has said that summer 2026 is increasingly likely to become the UK’s warmest on record for mean temperature. For businesses investing in air conditioning, however, the temperature is not the only consideration. The tax treatment of the installation can also have an important impact on the overall cost.

Can you claim capital allowances on air conditioning?

Installing air conditioning can represent a significant investment, so businesses should make sure they are maximising the tax relief available on the expenditure.

Under Section 33A of the Capital Allowances Act 2001, air conditioning systems are generally treated as an integral feature of a building.

Expenditure on integral features would ordinarily fall into the special rate pool, where writing down allowances are currently available at 6% per year.

However, businesses may be able to obtain tax relief much sooner.

Could you claim 100% tax relief?

Where a business has sufficient Annual Investment Allowance (AIA) available, qualifying expenditure on air conditioning may be eligible for 100% tax relief in the year the expenditure is incurred.

This can make a substantial difference to the timing of the tax benefit and, importantly, to business cash flow.

The correct treatment will depend on the circumstances of the business, the nature of the installation and the capital allowances already claimed during the relevant period.

Why does the timing of expenditure matter?

Air conditioning installations and larger refurbishment projects are often paid for in stages or instalments.

The timing of those payments, together with when the expenditure is treated as incurred for capital allowances purposes, can affect when tax relief becomes available.

For businesses undertaking a significant project, considering the capital allowances position early can therefore help with both tax planning and cash flow management.

Capital allowances and property projects

Air conditioning is just one area where capital allowances can easily be overlooked.

Businesses carrying out:

• office fit-outs
• property renovations
• refurbishments
• extensions
• commercial property acquisitions
• significant plant and machinery installations

may have expenditure that qualifies for different types or rates of capital allowances.

Identifying qualifying expenditure correctly can help ensure valuable tax relief is not missed.

Make sure you are maximising your capital allowances

Capital allowances can be a complex area of tax, particularly where a project involves a mixture of building works, fixtures, integral features and plant and machinery.

Our specialist team can review expenditure across a project to identify qualifying costs and help ensure your business is claiming the tax relief available to it.

This can be particularly valuable when undertaking commercial property fit-outs, renovations or other significant capital projects.

If you are planning an investment or have recently completed a project, speak to our team about reviewing your capital allowances position.

(E) enquiries@advaloremgroup.uk (T) 01908 219100 (W) advaloremgroup.uk