Question

What is a right to light?

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Answer

A legal right to receive a certain amount of natural light through a defined aperture — a window, not a garden — and it is entirely separate from planning permission, which is the distinction that causes most confusion.

How the right arises. In England and Wales it is typically acquired by prescription under the Prescription Act 1832: uninterrupted enjoyment of light through a particular window for 20 years creates an easement. It can also be created expressly in a deed, or by implication. It attaches to the building, not the occupier, and passes with it.

What it protects. Not a view, not sunlight specifically, and not light to open land. The right is to sufficient light for the ordinary use of the room, judged by a technical test. The conventional approach assesses what proportion of a room receives a defined minimum level of natural light at working-plane height, and asks whether a development reduces the adequately lit portion below roughly half — the "50/50 rule", refined by more sophisticated modelling in modern practice.

Why planning permission is not the answer. A developer can hold full planning consent and still be obstructing a right to light, because the local authority assesses public planning considerations and not private property rights. Conversely, a scheme refused permission raises no right-to-light question at all.

What a holder can seek. Historically an injunction preventing or requiring removal of the obstruction — a genuinely powerful remedy, and one the courts have been willing to grant even against completed buildings. Damages in lieu are common, negotiated as a share of the developer's profit, which is why these claims are taken seriously.

How rights are prevented or extinguished: a light obstruction notice, registered as a notional obstruction to stop the 20-year period completing; express agreement or a deed of release; and certain statutory powers used in regeneration schemes.

What to do: if you are developing, commission a right-to-light survey early; if you are affected, act promptly, since delay weakens an injunction claim substantially.

England and Wales; other jurisdictions differ. General information, not legal advice.

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