Rights of Light Act 1959: What It Means for Property Owners

By Margaret Shields · 31 July 2026

Most people who hear about rights of light learn about the Prescription Act 1832 and the basic rule that 20 years of uninterrupted light through a window can create a legal right. Fewer people know about the Rights of Light Act 1959, which gave developers a specific tool to stop those rights from being acquired in the first place. If you own property near a development site, this statute could directly affect you.

The Rights of Light Act 1959 was introduced to solve a practical problem. Under the Prescription Act 1832, a right of light is acquired once light has passed through a defined aperture, such as a window, for 20 continuous years without interruption. Historically, the only way a landowner could prevent this was by physically blocking the light, for example by building a fence or hoarding tall enough to obstruct it. That was expensive, ugly, and sometimes impractical. The 1959 Act created an alternative: a notional obstruction registered with the Upper Tribunal (Lands Chamber), formerly the Lands Tribunal. This is what we now call a Light Obstruction Notice.

A Light Obstruction Notice, or LON, works as if a physical barrier had been erected across the neighbouring land. Once registered, it has the legal effect of interrupting the flow of light for the purposes of the prescriptive period. If you are a property owner and a LON is registered against your building, your 20-year clock can be reset or broken, potentially preventing you from ever acquiring a right of light over that land. The notice must be publicised locally, and affected owners have one year from the date of registration to challenge it by issuing a claim in court. If you do nothing within that year, your ability to object is lost.

This matters because many property owners simply do not notice these registrations. Developers are required to take certain steps to publicise a LON, but the reality is that a notice pinned to a lamppost or published in a local newspaper can easily be missed. If you own a home, a flat on a long lease, or a commercial unit near a site where development is planned, keeping an eye out for these notices is genuinely important. You can learn more about your legal rights as a property owner to understand the protections available to you.

One common misunderstanding is that the Rights of Light Act 1959 allows developers to extinguish rights of light that already exist. It does not. The Act only provides a mechanism to prevent new rights from being acquired through prescription. If your property already benefits from a right of light that has been enjoyed for 20 years or more, a LON cannot take that right away. The developer would need to negotiate with you, seek your consent, or face the possibility of a claim for damages or even an injunction if they proceed with a building that blocks your light. Understanding what a right of light is and how it arises will help you work out where you stand.

So what should you do if you suspect a Light Obstruction Notice has been registered near your property? The first step is to check with the Upper Tribunal, which maintains a register. If a LON has been registered and you believe it affects light to your windows, you need to act within the one-year challenge period. Missing this deadline is serious, because it means the interruption takes legal effect and your prescriptive claim is blocked. Getting professional advice early is essential. A rights of light surveyor can assess whether the notice actually affects light to your building, and a solicitor can advise on the merits of a challenge.

It is also worth understanding that developers sometimes use LONs as a tactical measure, registering them well before construction begins to clear the path for future projects. This is entirely lawful, but it means you cannot afford to be passive. If you are unsure about whether you can make a claim or whether your existing rights are affected, getting a proper assessment done sooner rather than later is the smart move.

The interplay between the 1959 Act and the 1832 Act catches many property owners off guard. The law gives you real, enforceable rights to light through your windows, but it also gives neighbouring landowners a way to prevent those rights from crystallising. Knowing how both statutes work together puts you in a much stronger position, whether you are defending an existing right or trying to establish one. If you want to understand the full picture, read our frequently asked questions for a broader overview of how rights of light work in practice.

Reference: Rights of Light Act 1959 (c.56); Prescription Act 1832 (c.71)