Amenity space standards for flats: private, communal and play

England has no national standard for outdoor amenity space. The nationally described space standard, which councils quote constantly, governs internal floor areas, built-in storage and ceiling heights, and stops at the front door. Every figure you have been given for balcony depth, garden area or communal courtyard size comes from a local plan policy, a supplementary planning document or, inside the capital, the London Plan. For a developer working across authority boundaries, that is the single most useful thing to know, because the same block can be policy compliant in one borough and short by a third in the next.

So the first task on any flatted scheme is to find the actual adopted number, not the number your last scheme used.

Where the numbers come from

Three sources, in descending order of certainty.

The London Plan 2021 is the clearest. Policy D6 requires a minimum of 5 square metres of private outdoor space for one and two person dwellings, with an additional square metre for each further occupant, and sets a minimum depth and width of 1.5 metres so the space is usable. That last dimension does more work than the area figure. A 5 square metre balcony at 1.2 metres deep takes a table and nothing else.

Local plan policies outside London vary from a single sentence to a detailed schedule by dwelling size. Some authorities set a flat figure per flat, some vary it by bedroom count, some express it as a proportion of internal floor area. A few say only that development should provide adequate amenity space, which shifts everything onto the design and access statement.

Supplementary planning documents carry the detail in most places: a householder design guide, a residential design SPD or an urban design code. They are material considerations rather than development plan policy, so their weight depends on how they were prepared and how current they are. An SPD adopted in 2009 alongside a superseded local plan carries less force than one adopted last year, and saying so politely in a planning statement is a legitimate argument.

Private, communal and public are three different things

Private space is space for the exclusive use of one dwelling: a balcony, a terrace, a private garden. Its value is that residents can use it without arrangement.

Communal space serves the block. The tests are whether it can be used, whether it gets sun, whether residents can reach it without leaving the building, and whether it is overlooked enough for people to feel safe letting children out. A courtyard that meets the area figure and sits in shade until four in the afternoon fails on the test that matters. That is why the daylight and sunlight work and the landscape design need to run together rather than in sequence, and why sunlight to a courtyard in a perimeter block is worth modelling before the massing is fixed.

Public open space is the wider provision the scheme draws on and may contribute to. It is the subject of an open space assessment, which looks at quantity, quality and accessibility of existing provision against the local standard, and at whether the new population can be absorbed.

Substituting one for another is possible and often necessary on tight urban sites. Substitution works when the argument is specific: this scheme provides communal roof terrace at this area, with this many hours of sun on 21 March, within this walking distance of a park of this size and quality, and here is the sunlight study. It fails when it is a general assertion that the site is well served.

Play space, and the arithmetic behind it

Play space is calculated from child yield rather than from dwelling count. In London, Policy S4 of the London Plan requires at least 10 square metres of play space per child, and the child yield is derived using the Greater London Authority population yield calculator applied to the proposed housing mix and tenure. Two schemes with the same number of homes can generate very different requirements if one is weighted to family sized affordable housing.

The provision is also tiered by age. Greater London Authority guidance sets out doorstep play for the youngest children close to the home, with progressively greater walking distances accepted for older age groups, so a single large play area at one end of a site does not satisfy the requirement for under fives at the other.

Outside London the approach is looser. Many authorities apply open space standards from their local plan, some use the Fields in Trust benchmarks, and some take a financial contribution towards off-site provision through a section 106 obligation. A play space assessment sets out the yield, the proposed provision by age group, the equipment approach and the management arrangements.

Two design points decide whether play space survives to construction. Play space on a podium needs the structural loading and drainage designed in from the start. And play equipment specified to BS EN 1176 and surfacing to BS EN 1177 has maintenance implications that a management company has to fund, so the service charge conversation belongs at design stage.

Where amenity space collides with the rest of the design

Balconies are the usual flashpoint. They deliver private space efficiently and they cut daylight to the windows beneath, which is exactly why balconies reduce daylight to the flat below shows up as a recurring point in daylight reports. Inset balconies are worse for the room behind them than projecting ones, and recessed balconies at the base of a light well can take a room below any reasonable target.

Communal courtyards collide with separation. A courtyard narrow enough to keep the scheme dense is a courtyard where windows face each other, and the separation distances authorities apply were written for suburban back-to-back conditions rather than for perimeter blocks. Where you depart from them, say why, and show the mitigation: angled windows, obscured glazing to bathrooms, planting, level changes.

An illustrative test

Illustrative example. A 48 flat scheme in an outer London borough, mix weighted to two bedroom homes. Policy D6 generates a private outdoor space requirement that the design meets with 6 square metre balconies at 1.6 metres deep. The population yield calculator produces a child figure that translates, at 10 square metres per child, into a play requirement larger than the available podium. The scheme provides doorstep play on the podium for under fives, and a commuted contribution towards an upgrade of the park 250 metres away for older children, evidenced by a walking route plan and the park's own management plan. All figures are illustrative and the calculator output governs.

Pull the adopted policy wording and the SPD before the first massing study, and put the amenity area schedule on the drawings rather than in a table nobody opens. Officers check it early, and a scheme that has to lose two flats at week ten is more expensive than one designed to the number.

Enter your site postcode on PlanScope to see which supporting documents a flatted scheme is likely to need.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.