Capital Allowances for Student Accommodation: The Dwelling-House Haircut

Purpose-built student accommodation, or PBSA, is the sector where the capital allowances headline and the reality part company. A large block looks like a rich claim. It has hundreds of bedrooms, each with sanitaryware, heating and services, plus lifts, laundries, gyms and central plant. Apply the sort of embedded percentage you would use on a hotel and the numbers look enormous. Then the dwelling-house restriction lands, and most of that claim disappears. Understanding why is the whole point of this page, because it is the one nuance that separates student accommodation from every other sector we cover.

This is not the statute walk-through. The mechanics of how plant and machinery is categorised and pooled are set out in full on our capital allowances pillar, and the dwelling-house restriction itself is worked through on our HMO common parts claim mechanics guide, which deals with the same section 35 boundary in a multi-tenant setting. Here we focus on what the restriction does to a PBSA claim, where the line falls, and how to value what is left.

Why student accommodation disappoints on capital allowances

Most sectors we look at reward repetition. A hotel with forty ensuite bathrooms claims the sanitaryware forty times over, which is exactly why hotels sit at the top of the claim range. Instinct says student accommodation should behave the same way, because a PBSA scheme has far more bedrooms than any hotel and each one carries its own basin, shower, heating and services. The naive calculation on a scheme like that reaches for a hotel-style figure of around 30% of cost.

That instinct is wrong, and it is wrong for one reason. A hotel guest does not live in their room. A student does. The bedroom a student occupies for the academic year is their home, and a home is a dwelling-house. The moment expenditure sits inside a dwelling-house, the dwelling-house restriction denies plant and machinery allowances on it. In student accommodation the very repetition that makes a hotel valuable works in reverse, because each additional study bedroom multiplies the restricted expenditure rather than the qualifying pool. The sector does not disappoint because there is little plant in it. It disappoints because most of that plant is in the wrong place.

The dwelling-house restriction: why the bedrooms are the problem, not the prize

The rule is section 35 of the Capital Allowances Act 2001. In broad terms it denies plant and machinery allowances on expenditure incurred in providing plant or machinery for use in a dwelling-house, where the qualifying activity is an ordinary property business. A dwelling-house is not defined exhaustively in the Act, but it takes its ordinary meaning of a building, or part of a building, that someone occupies as their home, with the facilities for day-to-day private domestic existence. A student's study bedroom, and the cluster flat it forms part of, meets that description.

The consequence is stark. The sanitaryware in each study bedroom, the fitted wardrobes and desk, the room heating, the extract ventilation, the lighting and the electrical fittings are all provided for use in a dwelling-house, so section 35 removes them from the claim entirely. They never enter the main pool or the special rate pool. This is the inverse of the hotel position, and it is why the two sectors, which look alike on a floor plan, sit at opposite ends of the claim-value range. We do not re-derive the section 35 case law here, because our HMO common parts guide already works through the same boundary in detail. The point for a PBSA owner is simply this: the bedrooms are the problem, not the prize.

What actually qualifies: the communal areas only

What survives the restriction is the plant serving the parts of the building that are not a dwelling-house, the genuinely communal areas that no single occupant lives in. These are real, defensible qualifying items, and on a well-amenitised scheme they add up. The communal plant in a typical PBSA block includes:

• Reception and entrance areas. The fit-out, reception desk, security and access control, and the heating, lighting and ventilation serving the entrance.
• Gym, games and study lounges. Fitness equipment, the fit-out of common rooms and shared study spaces, and the services feeding them.
• Shared laundry. Commercial washing machines and dryers, plus the power, water and drainage installations that serve them.
• Passenger lifts. Lifts serving the whole block are integral features in the special rate pool.
• Central plant. The boilers, hot water generation, ventilation and building management plant that serve the communal and shared areas, housed in the central plant rooms.
• Shared circulation. Lighting, heating and fire and security systems in the corridors, stairwells and lobbies that serve multiple flats rather than one home.

These items fall across the main pool, where the writing-down allowance is 14% from April 2026, and the special rate pool at 6%, with the Annual Investment Allowance of £1,000,000 or, for companies, full expensing and the 50% first-year allowance giving faster relief where the expenditure qualifies. HMRC set out how plant and machinery allowances work in the Capital Allowances Manual, and the general rules for claiming are summarised on gov.uk. We summarise the pool split here rather than restate the integral features category mechanics, which the pillar covers in full. The task on a PBSA scheme is not working out which pool an item sits in. It is drawing the boundary between the communal plant that qualifies and the residential plant that does not.

What a PBSA claim is really worth: the haircut in numbers

The clearest way to see the effect is to run a scheme both ways. Take a £5,000,000 purpose-built student accommodation development.

On the naive hotel-style assumption of around 30% embedded plant, the claim looks like £1,500,000, worth £375,000 in corporation tax relief at the 25% main rate. That is the number an owner half-remembers from a hotel or a care home comparison, and it is the number a general adviser who has not met the dwelling-house restriction might reach for.

Now apply section 35. Strip out the study bedrooms and cluster flats, which are the bulk of the building, and you are left with the communal areas only. On a typical scheme the qualifying communal plant works out at roughly 8% to 12% of total cost, so on £5,000,000 that is around £400,000 to £600,000 of qualifying expenditure, worth roughly £100,000 to £150,000 in corporation tax relief. The claim did not vanish. But it fell to a third or less of the naive figure, and on a bedroom-heavy scheme with minimal amenity it can be lower still. That drop, from £1,500,000 to something nearer £500,000, is the haircut, and it is the single most important thing to understand before budgeting the tax benefit of a PBSA acquisition or development.

Cluster flats, studios and the grey line

The boundary is not always obvious, and this is where a specialist earns their fee. The clearest case is a self-contained studio, which is plainly a single dwelling-house, so everything inside it is restricted. The next case is the cluster flat, where a group of students have their own bedrooms leading off a shared kitchen and living space. HMRC generally treats the whole cluster flat, including its shared kitchen, as one dwelling-house occupied jointly by its residents, so the plant in that shared kitchen is restricted along with the bedrooms. That surprises owners who assume a shared kitchen must be communal.

The genuinely communal areas are the ones that serve the building rather than any single home: the reception, the block-wide gym and lounges, the central laundry, the lifts, the plant rooms and the circulation that connects multiple flats. The line between a shared space inside a dwelling-house and a communal space outside every dwelling-house is a question of fact about how each part of the building is designed and occupied. It cannot be settled with a blanket percentage, which is precisely why a PBSA claim is surveyed rather than estimated, and why two schemes of the same value can support very different claims.

Buying versus already owning a PBSA scheme

If you already own a student accommodation block, you can still make a first capital allowances claim on the qualifying communal fixtures you hold, because there is no time limit on a first claim for fixtures you still own. The qualifying base is limited to the communal areas by the restriction, but on a large scheme that communal plant can still be a worthwhile figure, and the relief carries forward against future rental or trading profits.

If you are buying a second-hand scheme, the fixtures pooling requirement and the section 198 election govern how much of the price you can claim on the communal fixtures. Where a previous owner pooled those fixtures and no election is agreed, the entitlement can be lost, so the position belongs in the conveyancing rather than afterwards. The election and the pooling analysis only ever concern the communal fixtures that qualify in the first place, because the restricted residential parts never entered the pools. The buyer due-diligence angle, the pooling requirement and the election trap are covered in full on our sub-hub for embedded capital allowances in commercial property. It is also worth comparing the treatment on our capital allowances for offices page, where a similar who-holds-the-claim question arises from the lease structure rather than the dwelling-house restriction.

How a specialist survey works and what it costs

A surveyor-led capital allowances review of a student accommodation scheme runs the same way as any fixtures claim, with one extra step that dominates the exercise. The specialist surveys the building, but the critical work is drawing the dwelling-house boundary: identifying which areas are dwelling-houses and therefore restricted, and isolating the communal plant that sits outside every dwelling-house and qualifies. Only then do they apportion the cost of that communal plant across the pools on a just and reasonable basis and prepare the analysis HMRC expects. You can estimate the shape of a claim with our capital allowances calculator, but the calculator cannot see the dwelling-house line, so treat its output as a ceiling that the section 35 restriction will pull down.

Reputable firms generally work on a no-win, no-fee or contingent basis, so the review costs you nothing up front and a fee applies only if a claim is agreed. For this sector especially, use a specialist fixtures firm rather than a general accountant, because the value of the engagement is entirely in getting the dwelling-house boundary right. Draw it too wide and the claim is wrong and exposed on enquiry. Draw it too narrow and you leave the genuine communal relief on the table. You should never be routed towards a fee-protection or tax-investigation insurance product as part of a capital allowances review.