Open space and play space contributions: the arithmetic
Open space contributions are arithmetic. Standards, occupancy assumptions, child yield and maintenance periods each carry an assumption you can check, and on a medium scheme the checking is worth a five-figure sum.
An open space contribution is arithmetic, not negotiation, and most of the argument on a small scheme comes from the three inputs rather than from the principle. The council takes a quantity standard expressed as hectares per thousand population, multiplies it by the population the development will generate, converts any shortfall into a capital cost per square metre, and adds a maintenance sum for a defined number of years. Every one of those steps has an assumption in it that can be checked, and on a fifty-unit scheme the difference between a careful check and a signature is often a five-figure sum.
Where the standards come from
Quantity standards sit in the adopted local plan, usually supported by an open space assessment or a playing pitch strategy prepared as part of the evidence base, and frequently expanded in a supplementary planning document.
Most English authorities set standards derived in some form from the long-established benchmark of 2.4 hectares of outdoor playing space per thousand population, split between outdoor sport and children's play. Many have since produced their own locally evidenced figures, broken down by typology: parks and gardens, natural and semi-natural green space, amenity green space, provision for children and young people, outdoor sports facilities and allotments.
In London the position is different again. The London Plan sets a child play space standard expressed as square metres per child, with the child yield taken from the Greater London Authority's own population yield calculation, which means London schemes work from a headcount of children rather than from a population per hectare figure.
Find the standard that actually applies before you model anything. An Open Space Assessment that applies a national benchmark where the council has adopted its own local standard will be rejected, and the officer will substitute their figure.
Occupancy assumptions and how they drive the figure
The population generated by a development is the multiplier, and it is where the largest errors hide.
Councils normally apply an average household size by dwelling type and bedroom count, derived from census data for the area. A one-bedroom flat might be assumed at around 1.4 people and a four-bedroom house at around 3.2, though the figures vary by authority and are revised as new census data arrives. Multiply through the schedule of accommodation and you get the population.
Three checks are worth making every time.
- Is the figure applied to net additional dwellings, or to the gross number? A scheme replacing four existing houses with twelve should be assessed on eight.
- Is the right occupancy applied to each type? Applying a family house figure to one-bedroom retirement flats overstates the child population substantially.
- Where the scheme includes accommodation with restricted occupancy, such as age-restricted or student housing, does the calculation reflect that there will be no children at all?
For play space specifically, the calculation goes a step further and applies a child yield rather than a population figure. Ask which age bands the council is counting, because standards for under-fives, for juniors and for teenagers are usually set separately and applied to different catchments.
On-site provision against a payment
The starting presumption in most policies is on-site provision where the scheme is large enough to deliver something usable, and a financial contribution where it is not.
The threshold for that switch matters commercially. A small area of play equipment on a twenty-unit scheme costs more per child served than a contribution towards improving an existing park four hundred metres away, and it saddles the management company with an inspection regime under the play equipment standards for the life of the estate. Our note on open space and play space contributions on small schemes looks at where that balance falls.
Where a payment is sought, it has to satisfy the statutory tests in regulation 122 of the Community Infrastructure Levy Regulations 2010: necessary to make the development acceptable, directly related to it, and fairly and reasonably related in scale and kind. Ask the council to identify the project the money will be spent on. A contribution to a named scheme in a named park is enforceable and defensible. A contribution to a general fund is neither.
Quality and accessibility standards
Quantity is only half of it. Most policies also set accessibility standards expressed as walking distances, and quality standards drawn from a local audit.
Accessibility is the one that changes the answer. If the policy requires a local play area within a few hundred metres and there is one within that distance, the council may accept a contribution to improve it rather than new provision. If the nearest equipped area is a kilometre away across a distributor road, on-site provision becomes hard to avoid. Measure the walking route, not the straight line, and account for crossings.
Where the Play Space Assessment shows existing provision is below the quality standard, expect the council to seek a contribution to bring it up rather than accepting that provision exists.
Maintenance sums and their period
Commuted maintenance sums fund the upkeep of new provision, whether adopted by the council or held by a management company on the council's terms.
They are calculated as an annual cost per square metre by typology, multiplied by a period, commonly ten, fifteen or twenty years, and sometimes with a renewal allowance for equipment at the end of its life. Check three things. The typology applied, since amenity grass costs a fraction of what equipped play costs to maintain. The period, which is a policy choice rather than a fact. And whether the rate is indexed, and from what base date.
Ask for the council's published rates. If they are not published, ask for the calculation in writing before agreeing the heads of terms.
Checking the calculation for errors
The recurring errors are mundane and worth money.
Net against gross unit numbers. Occupancy applied to the wrong dwelling type. Double counting, where an area of on-site amenity green space is also counted towards the informal recreation requirement and then charged for again. Existing surplus in the ward ignored, where the council's own audit shows provision above its standard. Maintenance rates applied to the wrong typology. Indexation from the wrong base date. And a contribution sought for a typology the scheme cannot generate demand for, such as allotments from a student scheme.
None of these is bad faith on the council's part. The calculation is usually done from a spreadsheet by someone with forty other applications open. A Viability Assessment is not the answer to an arithmetic error, and running one when the real problem is a misapplied occupancy figure wastes time on both sides.
Negotiating provision that residents will use
The better conversations are about what gets built rather than about the total. A single doorstep play space with two items of equipment on a windswept corner of the site meets the policy and is ignored within a year.
Argue for provision positioned where parents can see it from kitchen windows, with natural surveillance, a bench, a bin and a path that connects to where people actually walk. Offer a landscape-led scheme with mounding, planting and informal play rather than a fenced enclosure of catalogue equipment, and price the maintenance honestly. Officers respond well to that, because they field the complaints when it goes wrong.
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.
Frequently asked questions
Where do open space standards come from?
From the adopted local plan, supported by an open space assessment or playing pitch strategy in the evidence base and often expanded in a supplementary planning document. Many authorities derive them from the long-established benchmark of 2.4 hectares per thousand population, split between sport and play, but locally evidenced standards by typology are now common.
How is the population figure calculated?
By applying an average household size for each dwelling type and bedroom count, usually derived from census data for the area, to the schedule of accommodation. Check that it is applied to net additional dwellings rather than the gross number, that the right occupancy is used for each type, and that restricted occupancy housing is reflected.
When can a payment replace on-site provision?
Where the scheme is too small to deliver usable provision, or where existing facilities within the policy walking distance can be improved instead. Any payment has to satisfy regulation 122 of the Community Infrastructure Levy Regulations 2010, so ask the council to name the project the money will be spent on rather than accepting a general fund.
How are maintenance sums worked out?
As an annual cost per square metre for the relevant typology, multiplied by a period that is commonly ten, fifteen or twenty years, sometimes with a renewal allowance for equipment. Check the typology applied, the period, which is a policy choice, and whether the rate is indexed and from which base date.
What are the most common calculation errors?
Gross rather than net unit numbers, occupancy applied to the wrong dwelling type, double counting an area against two requirements, ignoring an existing surplus shown in the council's own audit, maintenance rates applied to the wrong typology, indexation from the wrong base, and contributions sought for a typology the scheme cannot generate demand for.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.