What is a Right to Light?
This guide explains what a right to light is, how it is acquired, what constitutes an infringement, and what options are available when a right to light is threatened.
Blue Sky Surveyors are specialist rights of light surveyors.
The Legal Nature of a Right to Light
A right to light is a type of easement — a legal right enjoyed by the owner or occupier of one property (the dominant tenement) over a neighbouring property (the servient tenement). An easement runs with the land, meaning it passes automatically on any transfer of the property without needing to be separately documented.
Rights of light are governed by common law and statute, primarily the Prescription Act 1832. They exist entirely independently of the planning system. The grant of planning permission for a development does not create, extinguish, or override a right to light.
How is a Right to Light Acquired?
Under the Prescription Act 1832, a right to light is acquired automatically when light has passed through a window or aperture for a continuous period of at least 20 years without interruption. Unlike other types of easement, it arises automatically by operation of law — no action by the benefiting owner is required.
The 20-year period is calculated backwards from the date of any legal proceedings, not from the date of the obstruction. The right is acquired through the window or aperture itself — each window must be considered separately.
A right to light can be expressly granted in a deed, conveyance, transfer of land, or lease. Where expressly granted, its extent and nature are determined by the terms of the grant.
In certain circumstances, a right to light may arise by implied grant — for example, where land is divided and one part is sold off. Implied grants are a complex area of law and specialist legal advice is recommended.
What Does a Right to Light Protect?
A right to light does not protect an absolute level of light — it protects the right to a level of natural daylight sufficient for the comfortable use and enjoyment of the property. The relevant standard is whether the amount of light remaining after an obstruction is adequate for the ordinary beneficial use of the building.
What is an Infringement of a Right to Light?
An infringement occurs when a development reduces the amount of natural daylight passing through a protected window to below an acceptable level — insufficient for the ordinary comfortable use and enjoyment of the room. Not every reduction in light constitutes an infringement.
An infringement can occur even where a development complies with BRE daylight and sunlight guidelines for planning purposes. The legal test for rights of light is entirely separate from the planning test.
Remedies for Infringement
Injunction
The primary remedy for an infringement is an injunction — a court order requiring the infringing party to modify or demolish the offending structure. Courts have historically been willing to grant injunctions in rights of light cases, even where this results in significant financial loss to the developer.
Damages
Where an injunction would be oppressive or disproportionate, a court may award damages in lieu. The measure is typically based on the sum the parties would have negotiated for a release of the right — often a share of the development profit attributable to the infringement.
Negotiated Settlement
The majority of rights of light disputes are resolved through negotiation. A cash payment in return for a formal release of the right to light is a common outcome.
Can a Right to Light be Prevented
or Extinguished?
Light Obstruction Notice (LON)
A landowner can interrupt the acquisition of a right to light by registering a Light Obstruction Notice (LON) under the Rights of Light Act 1959. A LON is registered at HM Land Registry and resets the 20-year prescription period. LONs are an important tool for developers and landowners managing rights of light risk.
Release by Agreement
An established right to light can be extinguished by agreement — typically a deed of release in which the benefiting owner formally gives up the right, usually in return for a financial payment.