Transient overshadowing of allotments and playing fields

Overshadowing allotments playing field land is assessed differently from overshadowing a back garden, and the difference is worth knowing before you write an objection. A garden is judged mainly on whether people can sit in the sun. Growing ground and sports pitches are judged on whether the land can still do its job: whether crops ripen, whether a sward survives the winter, whether frost clears by kick-off. Those questions need shadow analysis through the day and across the year, not a single equinox drawing.

Why open land is assessed differently from gardens

The BRE guidance on site layout planning for daylight and sunlight, BR 209, gives the familiar amenity test: at least half of an amenity area should receive at least two hours of sunlight on 21 March. That test was designed for gardens and sitting-out space, and it is a reasonable starting point for open land.

It is only a starting point. Two hours of March sun does very little for a vegetable plot in June or for a pitch that needs to dry after Saturday rain. The receptor here is a land use with its own requirements, so the assessment has to say what those requirements are and then test the proposal against them.

Councils vary in how firmly they apply this. Some treat protected open space as a straightforward amenity receptor. Others, particularly where a local plan policy protects allotments or playing fields by name, expect a fuller analysis. Ask the case officer which approach applies before commissioning or challenging anything.

Shadow path analysis through the day and the year

The technical work is a series of shadow plots generated from a three-dimensional model of the proposal, the existing context and the ground levels.

A usable set covers 21 March, 21 June and 21 December at hourly intervals through the daylight hours, with a summary plan showing the cumulative hours of direct sun received across the receptor on each date. The equinox drawing alone hides the two things that matter most: the deep winter shadow that sits on a pitch all day, and the early-morning summer shadow that stops dew burning off.

Ask for the sun-hours plan. A set of hourly snapshots is easy to read selectively. A contoured plan showing hours of sun per square metre is not, and it is the drawing on which a fair argument can be had. The modelling conventions are the same ones used in any Daylight and Sunlight Assessment, and the same questions about model accuracy arise, including the ones set out in the notes on modelling neighbouring rooms when access is refused.

Growing seasons and the months that matter

For allotments, the relevant period runs roughly March to October, and the critical months are the ones either side of midsummer when fruiting crops set.

Most vegetable crops want full sun for the better part of a day. Tomatoes, courgettes, beans, sweetcorn and most fruit will crop poorly in persistent shade. Leaf crops, brassicas and soft fruit tolerate more. A useful objection does not simply assert that shade is bad. It identifies which plots lose how many hours, at which times of day, in which months, and relates that to what is grown there.

Ground conditions matter too. Shaded plots stay wet, which shortens the workable season at both ends, encourages slug damage and makes the soil harder to cultivate in spring. Where the site is a statutory allotment, disposal or change of use requires the consent of the Secretary of State under section 8 of the Allotments Act 1925, so the shading question sometimes sits alongside a separate legal protection.

Playing pitches, frost and surface drying

Turf needs light to recover from wear. A pitch in winter shade develops a thin sward, moss and bare patches in the goalmouths, and grounds staff cannot renovate it in the usual spring window because the grass does not grow.

Two operational effects drive most cancellations. Frost that sits in shade long after the rest of the pitch has thawed, and surface water that does not evaporate. Both compress the number of playable days in a season, and for a club that plays on one pitch that can be the difference between fulfilling a fixture list and not.

Sport England is a statutory consultee on development affecting playing fields under Schedule 4 to the Development Management Procedure Order 2015. Its interest is principally in loss of playing field land rather than in shading, but a documented reduction in playable days is a matter it can comment on, and a response from it carries weight with officers that a residents' letter does not.

Consultee interest in protected open space

Work out first what the land is designated as. The options usually include allotments protected by local plan policy, playing fields, Local Green Space, a public park, or land held on a statutory trust. Each attracts a different policy test and a different consultee.

Then check who has to be asked. Sport England for playing fields. The parish or town council where one exists. The council's own parks and green space team, whose comments are often the most informed and the least read. Where the land is a registered park or garden, or within a conservation area, heritage consultation runs alongside.

An objection that names the designation, cites the protecting policy and explains the functional harm will be read. One that says the development is too tall will not.

Evidence for an objection

Objectors rarely have the budget for their own three-dimensional model, and they do not usually need one.

What works is documentary. Photographs taken from fixed points across the year, dated, showing existing shadow patterns at the same times of day. Records from the allotment association or club: cancelled fixtures, plot vacancy rates, notes on which plots are hardest to let. A plan of the site marked with what is grown or played where. And a careful reading of the applicant's own shadow drawings, because the most common weakness is an incomplete set rather than a wrong one.

Check three things in the applicant's submission. Whether the model includes existing trees and boundary structures (leaving them out understates the baseline and can understate the change). Whether ground levels are modelled or assumed flat. And whether the receptor boundary used matches the actual extent of the allotments or pitches rather than a convenient rectangle. A dedicated Overshadowing Study should answer all three on its face.

Mitigation that actually works

Massing is the only reliable lever. Stepping height down towards the southern edge of the receptor, setting the building back, and breaking a long block into separate elements with gaps that let morning and evening sun through all make measurable differences, and a revised sun-hours plan will show it.

Some proposals are cosmetic. Light-coloured render adds nothing to direct sun hours. Tree planting on the boundary usually makes the shading worse. Relocating the most sensitive plots or re-orientating a pitch can help where the land manager agrees and the land allows it, though on a full allotment site there is rarely spare ground to move into.

Where harm cannot be designed out, a contribution to improved facilities elsewhere is sometimes offered. Treat that sceptically. Compensation for lost growing light is not the same as replacing it, and the community body should be asked whether it actually wants the money or the sunlight. Similar trade-offs arise in the courtyard cases described in the notes on sunlight to courtyard amenity space.

If you are preparing an application near protected open space, enter your postcode on PlanScope to see which reports the site is likely to need before the massing is fixed. 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.