Rights of light and the planning permission that ignores it

Planning permission does not authorise interference with a right of light. It never has. A rights of light easement is a private property right, and the grant of planning permission is a public law decision about whether development is acceptable in planning terms. The two systems run in parallel, they use different methods of measurement, and a developer who treats a favourable daylight and sunlight report as clearance to build is carrying an unpriced risk into construction.

The risk is real rather than theoretical. Courts have been willing to grant an injunction requiring a completed or partly completed building to be cut back where it interferes with a right of light, and even where damages are awarded instead, the sum can be assessed by reference to a share of the development profit rather than the loss of amenity.

Why a permission settles nothing

A local planning authority assesses amenity against policy. It will consider loss of daylight and sunlight to neighbouring windows, usually by reference to BRE guidance, and it will weigh that against the benefits of the scheme. It has no jurisdiction over private easements, and it will not refuse permission because an easement exists.

The reverse is also true. A neighbour whose objection on daylight grounds is rejected by the council has lost nothing in private law. Their easement, if they have one, survives the permission untouched.

There is one route by which a public body can override the easement. Sections 203 to 205 of the Housing and Planning Act 2016, which replaced the earlier provision in section 237 of the Town and Country Planning Act 1990, allow certain qualifying authorities to authorise building works that interfere with a right of light where the land has been acquired or appropriated for planning purposes, converting the neighbour's remedy from an injunction into compensation. That mechanism depends on the involvement of a qualifying authority and on the land history, and it is not available to a private developer acting alone.

How a right of light is acquired

Three routes, and the third does almost all the work in practice.

By express grant, in a deed or a lease that says so. By implied grant, where a transfer of part carries an implied easement for the benefit of the land sold. And by prescription under section 3 of the Prescription Act 1832, where light has been enjoyed through a defined aperture for 20 years without interruption and without written consent.

Prescription is what creates most rights of light. Twenty years of uninterrupted light to a window in a building is enough, and the right attaches to the aperture rather than to the room in general. A few consequences follow.

• A new window does not acquire a right for 20 years, so recent openings in an adjoining building may carry no right at all.
• Replacing a window in broadly the same position generally preserves the right.
• A building demolished and rebuilt with apertures in different positions may lose the right, which is why redevelopment history matters.
• A right can be defeated by a written consent given by the owner of the land now being developed, which is why title and file searches matter.

The measurement method, and why it differs from planning

Rights of light are conventionally assessed using the Waldram method, which is quite different from the planning tests. It measures the sky visible from points on a working plane inside the room and identifies the area receiving a defined minimum of sky light. The usual criterion treats a room as adequately lit where around half its area at the working plane still receives that minimum after the development.

The result is a plan showing the lit and unlit areas before and after, and a judgement on whether the loss amounts to an interference the court would act on.

A room can pass the planning tests and still give rise to an interference in private law, and it can fail the planning tests while the neighbour has no right at all. The two answers are not connected, and a daylight and sunlight assessment is not a rights of light opinion. Where the two systems meet, the overview in rights of light and planning daylight as two systems sets out the relationship.

Injunctions, damages and release agreements

Where an interference is established, the court has a discretion. It may grant an injunction requiring the offending part of the building to be removed or not to be built, or it may award damages instead.

The factors that influence which remedy applies include whether the injury is small and capable of being estimated in money, whether damages would be adequate compensation, whether the claimant has behaved unreasonably, and the conduct of the developer. A developer who pressed on with construction knowing of the objection is in a materially worse position than one who engaged early.

Damages may be assessed as the loss in value of the neighbour's property, or on a negotiating basis representing what the parties would have agreed for a release, which on a valuable scheme can be a substantial sum. Either way, the commercial answer is almost always the same: negotiate a release deed before the risk crystallises, price it into the appraisal, and consider rights of light indemnity insurance where a neighbour cannot be found or will not engage.

Light obstruction notices as a defensive step

The Rights of Light Act 1959 provides a way to stop a right accruing. A landowner who is worried that a neighbouring building is about to complete 20 years of enjoyment can register a light obstruction notice, which operates as a notional obstruction of the light for a year, interrupting the period of enjoyment without erecting a physical screen.

The procedure involves an application to the local authority and registration as a local land charge, and there is a route by which the neighbour can challenge it. For a landowner holding a site for future redevelopment next to a building approaching the 20 year mark, it is an inexpensive and effective protective step, and it is frequently overlooked because it has to be taken well before any development is contemplated.

Sequencing advice with the planning programme

The sequence that avoids trouble:

1. At acquisition, commission a preliminary rights of light appraisal on the massing envelope, alongside the planning appraisal, and get title and any consents checked.
2. At design stage, test the scheme against both the planning tests and the Waldram assessment, and identify which neighbouring apertures carry a right.
3. Before submission, decide whether to approach affected owners. Early engagement usually costs less than late, though it does put the neighbour on notice.
4. During determination, negotiate release deeds or arrange insurance, and price the outcome into the appraisal rather than treating it as a contingency.
5. Before starting on site, resolve the position. Building first and negotiating afterwards is the expensive order.

The point to hold on to is that a daylight report tells you what the council will think about amenity. It does not tell you whether a neighbour can stop your building.

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 about the planning system, not legal advice. Rights of light are a matter of property law and need advice from a solicitor and a specialist rights of light surveyor; check the position before relying on anything here.