Daylight in student and co-living accommodation

Purpose-built student accommodation and large-scale shared living sit awkwardly in the daylight standards, because the standards were written for dwellings and these rooms are not dwellings. A cluster study bedroom is a bedroom for sleeping, a study for working and often the only private space the occupier has. A co-living room is the same thing with a kitchenette. Neither matches the room categories the guidance uses, and the category chosen changes the target by a meaningful margin.

That gives the applicant a choice to make and justify, and it gives the council something to argue about. The schemes that get through are the ones where the classification is stated openly, applied consistently, and supported by the communal provision that makes the lower private standard reasonable.

Which standards apply to rooms that are not dwellings

Three points of law and policy shape this.

The nationally described space standard applies to dwellings, so it does not set room sizes for sui generis student or shared living accommodation. Local policy fills the gap, and in London there are specific policies for purpose-built student accommodation and for large-scale purpose-built shared living that set their own expectations on room size, communal space and amenity.

The daylight standards are not use-class dependent. The European standard for daylight in buildings, with its United Kingdom national annex, and the Building Research Establishment's guidance both work on room function rather than on planning use class. So a room used for sleeping is assessed as a bedroom whatever the planning use of the building, and a room used for sleeping and living is arguably assessed as a living space.

And the amenity policies in the adopted plan apply regardless. A scheme with compliant daylight figures and no usable communal space will still attract an objection on living conditions.

Study bedrooms and their dual function

The target illuminance in the guidance differs by room type, with kitchens expected to achieve more than living rooms, and living rooms more than bedrooms. A study bedroom sits between the bedroom and living room categories, and the honest answer is that it is a living space for most of the occupier's waking hours.

The pragmatic approach, and the one that holds up, is to assess study bedrooms against the living room target and report the bedroom target as a secondary result. That is harder to achieve and far harder to criticise. Where the scheme cannot meet the living room target in every room, report the proportion that does, identify the worst rooms, and explain the compensating communal provision.

Three design features decide the outcome. Window head height, because daylight from the top of the window penetrates furthest into the room. Room depth from the window wall, with deep narrow rooms performing worst. And the presence of an external obstruction such as a projecting wing or an opposite block, which is usually the dominant factor on an urban site.

Cluster kitchens and shared living space

The shared kitchen and living room in a cluster flat is where most schemes fail, and the reason is planning geometry rather than standards. The kitchen gets placed at the end of a single aspect wing, with bedrooms taking the better elevations, because bedrooms are what the business plan counts.

That arrangement puts the room with the highest daylight target in the worst position. The fixes are limited and they all cost bedrooms. Place the shared space at a corner to give it two aspects. Put it on the top floor with roof lights. Or accept fewer bedrooms per cluster and give the shared space the primary elevation.

Where a scheme keeps the kitchen in the poor position, the assessment should say so and the design and access statement should explain the compensating provision: a communal lounge at ground or roof level with good daylight, a study space, outdoor amenity. That reads as a design decision. Silence reads as an oversight.

Corridor depth and single aspect layouts

Double-loaded corridors are the economic logic of these buildings, and they produce single aspect rooms on both sides. On a deep plan with a central core, that can mean every room is single aspect with a limited window width.

Two consequences follow. Rooms facing a courtyard or a light well perform much worse than rooms facing outwards, and the courtyard dimension is therefore a daylight decision taken at massing stage. And overheating interacts directly, because a single aspect room cannot cross-ventilate and a larger window improves daylight while worsening solar gain. Resolve the two together rather than optimising one and discovering the other at technical design.

Long dead-end corridors also raise fire and wayfinding issues that affect core position, which pulls the daylight question into the same conversation as the fire strategy. Sleeping accommodation in rooms that are not self-contained dwellings has its own treatment in the hotel and care home context, which we look at in our note on daylight to hotel and care home bedrooms.

Amenity expectations in adopted policy

Adopted plans and supplementary documents in university towns and cities increasingly set expectations beyond daylight: minimum room sizes for study bedrooms, minimum communal space per bed, cycle parking, management arrangements and sometimes a nomination agreement with a named institution.

Those requirements interact with daylight because communal space is the currency in which a lower private standard is paid for. A scheme offering generous, well-lit communal provision has a case for study bedrooms at the bedroom target. A scheme with a token lounge in a basement does not.

Check the adopted plan, any student housing or shared living supplementary planning document, and the validation checklist before fixing the layout, because these requirements are local and they vary considerably between authorities with large student populations.

Evidence councils ask for

Five items cover most requests.

1. A room-by-room daylight assessment with the standard, edition and national annex named, and the room classification stated for each room type.
2. A plan marked with the rooms assessed and the worst performing rooms identified.
3. A schedule showing the proportion of rooms meeting each target, by room type and by floor.
4. The communal space provision, with its own daylight results and its area per bed.
5. A statement of how the layout responded to the results, including any rooms deleted or reconfigured.

The fifth item is the one that changes officer attitude. An assessment showing an iteration, where ten rooms were removed or reshaped after the first run, demonstrates that the standard drove the design. A single compliant run demonstrates nothing about the process.

A Daylight and Sunlight Assessment structured that way also answers the inevitable question about whether the worst rooms are habitable, and it keeps the discussion on the rooms that matter.

Where the layout has to change

Three situations where the honest answer is a layout change rather than a better report.

A courtyard narrower than the surrounding blocks are tall, with rooms facing into it. No assessment method rescues those rooms, and the options are to widen the courtyard, to put non-habitable uses on the lower courtyard floors, or to reduce the height on one side.

A cluster shared kitchen at the end of a single aspect wing facing an obstruction. Move it or lose bedrooms.

And a room depth that cannot be lit from a single window of the width the elevation allows. That is a plan proportion problem, and increasing the window height will help more than widening it.

Record the changes in the Design and Access Statement with the before and after results. Officers reading a scheme that visibly responded to its own daylight evidence are markedly more willing to accept the rooms that remain below target. Privacy between upper floors and surrounding flats often shapes the same layout decisions, as our note on roof terraces and neighbour privacy describes.

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