Capital Allowances on Property Renovations: The UK Guide for Commercial Property Owners

In our experience, renovation spend is one of the largest untapped sources of tax relief in UK commercial property. Whether you are upgrading a hotel, modernising a care home, refitting an industrial unit or repositioning a mixed-use investment, a large share of the cost is often plant, machinery and integral features hidden inside a single contractor invoice. Booked as one line, that value is easily lost.

This guide is the reference point for owners, landlords, finance teams and advisers planning renovation spend. It explains which allowances apply, which costs qualify, how capital and revenue treatment interact, and how to combine the reliefs into a single coherent claim. Our team of Chartered Tax Advisers, RICS-qualified surveyors and former HMRC inspectors works on renovation claims across every commercial property type, and the principles below reflect what we see in practice.

In this guide

• What are capital allowances on property renovations?
• The allowances that apply to a renovation
• Capital vs revenue: the critical dividing line
• Which renovation costs qualify?
• The Annual Investment Allowance on renovation spend
• Full expensing and first-year allowances
• Enhanced Capital Allowances and sustainable upgrades
• Structures and Buildings Allowance on renovation
• Landlord vs tenant: who claims what?
• How much tax relief could you recover?
• When to bring in a specialist
• Common mistakes on renovation claims
• HMRC compliance and documentation
• FAQs

Last reviewed: October 2026. Capital allowance rates and rules change regularly, so check the latest position before acting.

Capital allowances on property renovations are tax deductions, given under the Capital Allowances Act 2001 (CAA 2001), for qualifying capital expenditure incurred when improving or refurbishing a commercial building. They reduce taxable profits in place of accounting depreciation, which is not deductible for tax.

Can you claim capital allowances on property renovations? Yes, in most cases, provided the expenditure is capital rather than revenue, it is incurred for a qualifying business or property rental activity, and the person claiming has the right interest in the property. Spend on residential dwellings is generally excluded.

The key point is that treatment depends on the type of spend as well as the type of property or business. A new heating system can attract the same analysis in a hotel, an office or a warehouse. What changes the answer is how the cost is broken down, whether it is plant and machinery or building fabric, and whether it is an improvement or a repair.

Before any capital allowance is considered, each renovation cost must be classified as either capital or revenue. Revenue repairs are deductible immediately against profits. Capital expenditure is not deductible as a repair but may qualify for capital allowances.

HMRC distinguishes a repair, which restores an asset to its previous condition, from an improvement, which makes it materially better, or a replacement of the whole asset (the “entirety”). The analysis is fact-sensitive. Like-for-like replacement of part of an asset is usually a repair. Renewing the whole asset, or improving it beyond its original state, points towards capital.

Integral features add another layer. CAA 2001 contains specific replacement rules that decide when spending on replacing part of an integral feature (for example a lighting, heating or electrical system) is treated as plant and machinery expenditure rather than a repair. Larger replacements of these systems therefore need careful analysis rather than a default repairs treatment.

Why it goes wrong: classification is often decided by bookkeepers coding invoices as they arrive, long before anyone with capital allowance expertise sees them. A £400,000 refurbishment coded entirely to capital additions can miss tens of thousands of pounds of immediate repairs deductions; the same project coded entirely to repairs can be challenged on enquiry, with tax, interest and potential penalties. At a 25% corporation tax rate, every £100,000 misclassified can move £25,000 of relief between years or put it at risk.

Qualifying renovation costs fall into a few broad groups. Each still needs asset-level analysis, because the same heading on an invoice can contain plant, building fabric and repairs.

• Mechanical and electrical (M&E) services: heating, ventilation, air conditioning, general lighting and electrical systems. Most of these are integral features and sit in the special-rate pool.
• Integral features: electrical systems (including lighting), cold water systems, space or water heating, powered ventilation and air cooling, lifts and escalators, and external solar shading.
• Plant and equipment fixed to the property (PEFFs): fitted kitchens and catering equipment, sanitary fittings, fire alarm and sprinkler systems, security systems and CCTV, data cabling and AV equipment. These are usually main-rate plant.
• Energy-efficient and sustainable upgrades: heat pumps, LED lighting, building management systems, solar PV and EV charge points. These now usually qualify through the AIA or full expensing, with EV charge points eligible for their own 100% FYA.
• Structural improvements: extensions, new internal walls, structural alterations and building fabric that is not plant. These may qualify for SBA, subject to the SBA conditions and exclusion of plant-and-machinery expenditure.

Some categories need particular care:

• Partitions, glazing and furniture: movable or demountable partitions and loose furniture can be plant. Fixed glazing and structural partitions are usually building fabric, so not plant, though they may support an SBA claim.
• IT and server rooms: cabling, AV and IT equipment is usually main-rate plant. Server-room cooling and other HVAC is usually an integral feature, so special rate.

Costs that typically do not qualify as plant include walls, floors, ceilings, doors, windows, stairs and the main structure; land and landscaping; and professional fees that cannot be linked to qualifying items. Fees and preliminaries can often be apportioned to qualifying works, which is a frequent source of missed relief.

*Full expensing and the 50% special-rate FYA are available to companies within corporation tax only, on new and unused assets, with exclusions including second-hand assets and certain assets for leasing. The 40% FYA applies to qualifying main-rate expenditure from 1 January 2026. All treatment depends on asset-level analysis.

The SBA gives relief on capital expenditure on the construction, renovation or conversion of non-residential structures, at 3% a year on a straight-line basis over 33⅓ years. On renovation projects it acts as a safety net for qualifying building costs that are not plant and machinery.

Renovation building works may qualify for SBA, subject to the SBA conditions and exclusion of plant-and-machinery expenditure. The main conditions are:

• qualifying capital expenditure under a contract entered into on or after 29 October 2018;
• a qualifying non-residential use of the building once it is brought into use;
• the claimant holding an eligible interest in the land;
• a written allowance statement being in place, recording the qualifying cost and first use date;
• no overlap with plant and machinery allowances on the same expenditure; and
• the other statutory conditions in CAA 2001.

On £500,000 of qualifying structural works, the SBA would give £15,000 a year. That is modest compared with 100% relief on plant, which is why separating plant from fabric matters so much. Our Structures and Buildings Allowance guide and what qualifies for SBA cover the rules in more detail.

Common SBA mistakes on renovation invoices: claiming SBA on the whole contract sum (including plant that should attract higher relief); failing to prepare an allowance statement, which leaves later buyers unable to claim; including land, residential elements or pre-October 2018 contract costs; and missing SBA altogether on structural spend that sits outside the plant claim.

The examples below are illustrative. They assume a company paying corporation tax at 25%, new and unused assets, no other AIA claims in the chargeable period, a 12-month chargeable period, and that the structural works are assumed SBA-qualifying. Real claims depend on a detailed cost analysis.

Example 1: £250,000 light-touch refurbishment (office)

Estimated corporation tax saving in year 1: £50,375.

Example 2: £750,000 substantial renovation (care home)

Estimated corporation tax saving in year 1: £133,850, with a further £1,350 a year from the SBA thereafter.

Example 3: £2 million major refurbishment (hotel)

*Full expensing: companies within corporation tax only, new and unused assets, subject to exclusions.

Estimated corporation tax saving in year 1: £341,625. If the AIA had already been used elsewhere in the group, the integral features would instead receive a 50% FYA (£300,000 in year 1), reducing the first-year saving by £75,000 and deferring that relief through the special-rate pool.

A real example: restaurant refurbishment

For a Michelin-starred restaurant in London, we reviewed a £1,860,113 refurbishment and fit-out of the ground-floor dining room and basement commercial kitchen. Our surveyors identified £918,325 of capital allowances and £838,288 of expenditure qualifying for the Structures and Buildings Allowance, giving projected tax savings of £335,590. Read the full Great Restaurant Project case study.

A defensible renovation claim needs evidence that links each pound claimed to a qualifying asset. HMRC expects to see:

• contracts, invoices and payment records, with dates showing when the expenditure was incurred;
• a detailed cost analysis separating plant, integral features, building fabric, repairs and non-qualifying items;
• specifications and installation records for specialist equipment;
• written SBA allowance statements where SBA is claimed; and
• agreements documenting landlord and tenant contributions.

Claims made without supporting detail carry a higher risk of adjustment and penalties. Analysis by RICS-qualified surveyors, with oversight from Chartered Tax Advisers, gives a claim the technical and evidential basis it needs. HMRC’s Capital Allowances Manual and the GOV.UK capital allowances guidance set out the official position, and professional standards are maintained by the RICS and the Chartered Institute of Taxation.

Renovation spend is where capital allowance treatment is both most valuable and most easily mishandled. The right approach combines the AIA, full expensing and first-year allowances, the charge-point FYA and the SBA into a single coherent claim, built on a clear split between capital and revenue. Specialist input at planning stage protects the full relief and avoids costly reclassification later.

This article is general guidance and not tax advice. Worked examples are illustrative and based on stated assumptions. Rates and rules are correct at the date of review and may change.