How to Defeat Your Neighbour's Right to Light

The right to light under the doctrine of ancient lights is not absolute in all situations. Even where a right has been acquired under the Prescription Act 1832, it can be defeated, limited, or rendered unenforceable in certain circumstances.

First, the right can be defeated if it was acquired by permission rather than “as of right”. For a prescriptive easement to arise, the use must be without force, without secrecy, and without permission. If the neighbour originally allowed the light to pass, for example by express consent, then no legal right arises, and the servient owner remains free to build and obstruct the light at any time.

Second, the right can be defeated where there has been a sufficient interruption during the 20-year prescriptive period. Under the Prescription Act 1832, if the flow of light is interrupted for at least one year and the interruption is acquiesced in (i.e. not challenged), the prescriptive period is effectively broken. In such a case, the claimant cannot rely on continuous enjoyment to establish the right.

Third, even after a right has been acquired, it can be lost by abandonment. This occurs where it is clear that the dominant owner no longer intends to exercise the right, for example where a building is permanently altered so that the window is removed or blocked up. However, abandonment requires strong evidence of intention, and mere non-use is usually insufficient.

Fourth, the right may be defeated or overridden by statutory authority. If a development is authorised by statute or carried out by a public body acting within its legal powers, the right to light may be interfered with lawfully, often with compensation rather than an injunction being the appropriate remedy.

Fifth, the courts may refuse to grant an injunction even where there is an infringement, effectively weakening the right. In modern cases, courts sometimes award damages instead of ordering demolition, particularly where the interference is modest and the cost of removing the development would be disproportionate. This reflects a more flexible, policy-driven approach to land use.

Finally, a landowner can prevent a right from arising in the first place by taking proactive steps under Section 2 of the Rights of Light Act 1959. By registering a notice that acts as a notional obstruction, the servient owner interrupts the enjoyment of light without physically blocking it, thereby preventing the neighbour from acquiring prescriptive rights.