Protected London squares under the 1931 Act

The London Squares Preservation Act 1931 protects a scheduled list of garden squares, enclosures and gardens across inner London, and it operates independently of the planning system. That independence is the point practitioners miss. A grant of planning permission does not authorise works that the Act prohibits, and the Act's restrictions apply whether or not anything else about the square is designated. For anyone researching the London squares preservation act position on a site, the first question is whether the square appears in the Act's schedules, because if it does, the restriction is statutory rather than a matter of planning judgement.

What the Act protects and where

The Act followed a Royal Commission on London Squares in the late 1920s, set up because squares laid out as part of Georgian and Victorian estate development were being built over. Parliament responded with a local Act that listed the squares to be protected.

The schedules name the squares, enclosures and gardens by name and parish, with the result that protection depends on being on the list rather than on meeting a general test. Most are in what was then the County of London, so the geography is broadly inner London rather than the whole of Greater London. Some are large and well known. Many are small triangular enclosures, churchyard gardens and strips of planting that nobody would identify as a square from the street.

Ownership varies enormously and is a separate question from protection. Some are vested in a borough, some in a garden committee under a private Act or a trust deed, some in freeholders of the surrounding houses with rights of use attached to the properties. Protection under the 1931 Act attaches to the land, not to the owner.

The restrictions the Act imposes

The core restriction limits the use of a protected square to use as an ornamental garden, pleasure ground or ground for play, rest or recreation, and prohibits the erection of buildings or other structures on it other than those needed for, or convenient for, that use.

That wording is narrower than it first appears and broader than people hope. A gardener's store, a shelter, a seat, a railing, a drinking fountain and play equipment sit comfortably within the permitted category. A café for public use, a flat for a caretaker, a basement extension projecting under the garden from an adjoining house, a service road, a car park or a plant enclosure for a neighbouring building do not.

The restriction bites on change of use as much as on building. Turning a garden square into a commercial events venue, or fencing part of it off for the private use of one building, raises a question under the Act even where no structure is involved.

And because the Act is a statute, a breach is not answered by the planning merits. Several major infrastructure projects crossing London have needed specific statutory authority in their own Acts or orders to carry out works on protected squares, which tells you how absolute the baseline restriction is.

How it sits alongside planning permission

Four separate consent regimes can apply to the same works on the same square, and satisfying one says nothing about the others.

Many protected squares sit inside a conservation area, which brings the section 72 duty to pay special attention to preserving or enhancing character and appearance, and separate control over tree works. A good number appear on the Register of Parks and Gardens of Special Historic Interest, which is a material consideration rather than a consent regime. Boundary railings and gate piers are frequently listed in their own right, so replacing railings can need listed building consent for a structure most people assume is just a fence.

The practical consequence for advice is that a client asking whether they can build on or under a square needs the 1931 Act question answered first. If the Act prohibits it, the planning analysis is academic.

Railings, planting and the garden layout

Day-to-day management is where the Act most often surfaces.

Railing replacement, where the railings are listed or in a conservation area, is a heritage consent question before it is an Act question, and the usual issue is pattern, section and finish rather than principle. Wartime railing removal means many squares have post-war replacements of varying quality, and a proposal to reinstate a historic pattern is generally welcomed.

Planting and layout changes are usually within the permitted use, so the Act is rarely the obstacle. Tree works are controlled separately and are the most common enforcement issue, because a garden committee that fells a mature plane in a conservation area without notification commits an offence regardless of the Act.

Hard landscaping, lighting and play equipment have to be tested against both the use restriction and the ban on structures. A single piece of play equipment is convenient for use as a ground for play. A permanent enclosed play centre with a building is a different proposition.

Lighting also carries an ecological dimension where the square supports roosting or foraging bats, which is common in mature inner London squares with veteran plane trees.

Works that need separate authority

Anything that falls outside the permitted use, or involves a structure not needed for it, needs authority from somewhere other than planning. The Act contains limited provisions for works to be carried out with consent, and some squares are also governed by their own private Act or scheme of management with its own consent mechanism.

Because the route depends on the specific wording that applies to that square, this is a point for legal advice rather than planning advice. Basement proposals under or adjoining a square are the common trigger, and a Basement Impact Assessment will be needed for the planning application in any event, with ground movement and tree root effects on the square itself among the matters assessed.

Checking whether a square is scheduled

Work through four sources rather than relying on any one.

1. The Act's own schedules, which are the definitive list. Names have changed since 1931, so match by location as well as by name.
2. The borough's local plan, policies map and conservation area appraisals, which usually identify protected squares and often reproduce the list.
3. The National Heritage List for England, for listed railings, lodges and monuments within the square and for any entry on the Register of Parks and Gardens.
4. The borough's tree records and any Tree Preservation Orders covering the square.

Then look at the title. A square with rights of use attached to surrounding properties, or a scheme of management, adds private law constraints that no planning consent overrides.

Advising a client who owns or adjoins one

Lead with the restriction, not the opportunity. A client who has bought a house on a square and wants to extend under the garden should be told at the first meeting that the garden may be protected by a 1931 statute and that this is checked before anything is designed.

For a development adjoining a square, the practical issues are daylight and sunlight to the square and to the surrounding houses, construction access across or near the garden, tree protection, and the townscape effect of new massing on an enclosed space. Dense inner London sites bring their own assessment conventions, as applying BRE 209 daylight guidance in dense London explains, and a Heritage Statement should treat the square as a designed landscape with its own significance rather than as context for the building.

Squares are also frequently the focus of local civic groups, and consultation handled early tends to go better than consultation handled at committee, which is equally true of other protected local assets such as public houses in a London application.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; the application of a local Act to a particular square is a legal question, so take legal advice and check the position with your local planning authority before relying on it.