Capital Allowances for Industrial Units: What a Warehouse Can Really Claim

Why an industrial unit sits at the low end of the capital-allowances scale

Almost every commercial building holds unclaimed capital allowances in its fixtures. Warehouses and industrial units are the exception that proves the rule, because they hold less than any other commercial sector. Where a hotel or a dental practice can put 25% to 40% of its cost into the qualifying plant pools, an industrial unit typically manages only 5% to 15%. That is not a badly run claim. It is the nature of the building.

The reason is the ratio of fixtures to structure. A warehouse is a large steel portal frame or concrete envelope wrapped around a mostly empty volume. Most of what you pay for is the structure itself, the frame, the cladding, the roof and the floor slab, and that structure reaches only the Structures and Buildings Allowance at 3% a year. The faster plant and machinery allowances attach to a comparatively small amount of trade plant and building services sitting inside and on top of that shell.

Getting the number right still matters. On a seven-figure acquisition, even 8% of the price is a real pool worth real tax, and the trade plant inside an industrial unit attracts some of the fastest reliefs in the code. The job is to identify the genuine plant precisely, put each item in the right pool, and accept honestly that the shell is the shell. This page sets out what a warehouse can realistically claim and why the low percentage is the story, not a problem.

The plant and integral features that dominate an industrial-unit claim

The claimable content of an industrial unit clusters around trade plant and heavy building services rather than fit-out. The items that recur on almost every survey are:

• Cranes and hoists · overhead gantry cranes, jib cranes and fixed hoists installed for the trade carried on in the unit.
• Dock levellers and loading equipment · the powered platforms that bridge and adjust to a lorry bed at the loading bays.
• Roller-shutter and powered dock doors · where they operate as part of the trade rather than simply enclosing the building.
• Three-phase power and electrical distribution · the heavy electrical installation a warehouse or light-industrial process needs.
• High-bay and specialist lighting · the lighting system serving a high-roof storage or production space.
• Roof-mounted solar PV · photovoltaic arrays across the large roof area, increasingly common on distribution sheds.
• Yard drainage and dedicated external infrastructure · reviewed carefully, because much external work is setting rather than plant.

What is striking about this list is how it splits between two very different tax treatments, and that split is the whole point of an industrial claim. The trade plant behaves one way, the building services behave another, and the shell behaves a third. A survey that does not draw those lines precisely leaves relief on the table or claims items that will not stand up.

What a typical warehouse claim is worth: a worked example

Take a company that buys a £1,200,000 distribution warehouse. A specialist survey identifies embedded qualifying fixtures of around 8% of the price, roughly £96,000 of plant and machinery. At the 25% main corporation-tax rate, that pool is worth about £24,000 in corporation tax once relieved, and the fastest of it lands in year one.

Inside that £96,000, suppose an overhead crane and a pair of dock levellers make up £40,000. Those are main-pool items. Bought new, a company can write them off in full in the year of purchase using full expensing, so £40,000 of deduction turns into £10,000 of tax straight away rather than being drip-fed at 14% a year. The remaining £56,000 of electrics, high-bay lighting and roof solar are special-rate items relieved through the Annual Investment Allowance or the 50% first-year allowance, then written down at 6%.

Contrast this with the shell. The other £1,100,000-odd of structure reaches only the Structures and Buildings Allowance at 3% a year, or £33,000 of deduction annually over 33 and a third years. That is the arithmetic behind the low embedded percentage: a small, fast-relieving plant pool sitting on top of a very large, slow-relieving structure. The value in an industrial claim is real but concentrated, and it depends entirely on the trade plant being found and pooled correctly.

The nuance that sets industrial units apart: main-pool plant, not special rate

Most commercial capital-allowances claims are dominated by special-rate integral features, the electrics, heating, cooling, lifts and cold water that fall under section 33A of the Capital Allowances Act 2001 and are written down slowly at 6%. Industrial units are unusual because their signature items, the cranes, hoists and dock levellers, are the opposite. They are main-pool plant.

That distinction is worth money. Main-pool plant is written down at 14% from April 2026 rather than 6%, and, far more importantly, it is eligible for the fastest first-year reliefs in the system. A company can claim full expensing, a 100% first-year deduction with no cap, on new and unused main-rate plant, so a newly installed crane or dock leveller can be relieved in full immediately. The 40% first-year allowance introduced from 1 January 2026 gives an additional route on new main-pool plant that reaches unincorporated businesses too. None of those reliefs touch the special-rate pool. So while a warehouse claim is small in percentage terms, the part that is main-pool trade plant relieves harder and faster than almost anything a hotel or office puts in its claim.

The building services move the other way. The three-phase electrical system and the high-bay lighting are part of the electrical installation, an integral feature in the special-rate pool. The roof solar PV is also special-rate expenditure under section 104A, so it sits at 6% and outside full expensing, though companies can use the 50% first-year allowance on new panels. The shell, the frame, cladding, roof and slab, is neither: it drops to the Structures and Buildings Allowance at 3%. Three items, three treatments. For the underlying category mechanics, our integral features capital allowances guide walks through the section 33A boundaries in full, and the Structures and Buildings Allowance mechanics cover what happens to the shell.

Roller-shutter doors, yard drainage and the boundary questions

Two items on the industrial list are genuine boundary cases, and they are where claims are won or lost on the detail.

Roller-shutter and dock doors turn on function. A powered loading-bay door that forms part of a distribution operation, opening and closing continuously as vehicles are worked, has a strong argument to be plant used in the trade. A plain shutter that simply secures the opening is closer to part of the building. The courts test whether the item functions as apparatus with which the trade is carried on, or merely as the setting in which it is carried on, the plant-versus-setting question at the heart of cases such as SSE Generation and Urenco Chemplants. Dock levellers, which physically lift and bridge, sit clearly on the plant side.

Yard, hardstanding and external drainage are the hardest items in an industrial claim. External yards and access roads are usually the setting for the trade and fall outside plant and machinery allowances, and land preparation can fall outside the Structures and Buildings Allowance too. Drainage that forms part of a qualifying system, or infrastructure dedicated to specific plant, can sometimes be brought in. Because the treatment is so fact-sensitive, external works are reviewed item by item rather than assumed either way. This is precisely the kind of contested boundary a surveyor-led specialist is equipped to argue and evidence, and a general accountant is not.

Buying versus already owning an industrial unit

How you claim depends on whether the plant is coming to you through a purchase or is already yours.

When you buy a second-hand industrial unit, the fixtures rules apply. Since April 2014 the seller must generally have pooled the fixtures, and a joint section 198 election under the Capital Allowances Act 2001 usually fixes the value of the fixtures passing to you. If the fixtures were pooled and no election is agreed, the entitlement to claim on them can be lost entirely, so this has to be raised and settled during conveyancing rather than left to be sorted out afterwards. It is a point that routinely gets missed on industrial deals because the sums look small next to the building price, but the trade plant is exactly the part that relieves fastest.

When you already own a unit and never made a claim, a retrospective claim on the embedded fixtures is frequently still available, with no time limit on identifying historic qualifying expenditure that has never been pooled. The buying-side traps, the pooling requirement, the section 198 election and just-and-reasonable apportionment under section 562, are covered in full in our embedded capital allowances guide, which is the starting point for any commercial acquisition. It is also worth comparing the industrial picture with an office claim, where the fit-out content is higher and the landlord-versus-tenant question changes who holds the relief.

How a specialist survey works, and what it costs you

An industrial capital-allowances claim is a surveying exercise before it is an accounting one. A specialist visits the unit, or works from plans and the acquisition papers, and identifies each qualifying item, cranes, dock levellers, electrical distribution, lighting, solar and the rest, then apportions the purchase price on a just-and-reasonable basis and allocates every item to the correct pool. The output is a claim that stands up to HMRC scrutiny because each figure is evidenced, not estimated.

Most surveyor-led firms work on a contingent or fixed-fee basis, so the initial review is free and no fee arises unless a worthwhile claim is identified. For an industrial owner that is genuinely useful, because it means you can establish whether the plant content justifies a formal claim at no cost. A good specialist will also tell you plainly when a plain distribution shed is too thin to be worth the exercise, which is a judgment a general accountant cannot make without a survey. You can size the likely pool first with our capital allowances calculator, then have a specialist confirm the real figure.

Authority and sources

The treatment above rests on the primary law and HMRC guidance for plant and machinery allowances on commercial buildings:

• Capital Allowances Act 2001, section 11 (qualifying expenditure on plant and machinery), section 33A (integral features and the special-rate pool) and section 198 (fixtures elections on sale).
• HMRC Capital Allowances Manual, CA22300 (integral features) and CA26470 onward (fixtures and section 198 elections).
• gov.uk, Claim capital allowances and the guidance on full expensing and the Structures and Buildings Allowance.

Figures reflect the 2026/27 position: the Annual Investment Allowance at £1,000,000, full expensing at 100% on new and unused main-pool plant for companies, the 40% first-year allowance from 1 January 2026 on new main-pool plant, the main-pool writing-down allowance reduced to 14% from April 2026, the special-rate pool at 6%, and the Structures and Buildings Allowance at 3% straight-line. Capital allowances are an unregulated tax service. This page is general information, not advice on your specific claim; a specialist survey establishes the actual figures for your property.