A neighbour who built without planning permission has not, by that fact alone, breached your right to light. The two are separate systems, and confusing them is one of the quickest ways to lose a good position.
You watch the extension go up at the back. No notice, no application on the council portal, nothing. It blocks the window over your kitchen sink, and the obvious thought lands hard: they didn't even have permission, so surely they have to take it down. That instinct feels right. It is also, in most cases, wrong, and understanding why is what protects the claim you might actually have.
- Planning permission is public law; right to light is a private easement.
- A missing permission does not create or strengthen your light claim.
- Your real leverage sits in property law, not the planning department.
Why does building without planning permission not breach your right to light?
Planning control and rights of light answer completely different questions. Planning asks whether development is acceptable for the wider public and the area. A right to light asks whether one private property owner has interfered with a legal easement enjoyed by another.
A neighbour can hold full planning permission and still be liable to you for blocking your light. The reverse is equally true. They can have no permission at all and owe you nothing, if your windows never acquired a right in the first place.
The right itself is created under the Prescription Act 1832, usually after twenty years of uninterrupted light through a defined aperture. It does not appear because the council was kept in the dark. It appears because a window has enjoyed light long enough to gain protection at law. The presence or absence of a planning application changes none of that.
What does the planning breach actually get you?
Against the council, a breach of planning control is a matter for the local authority's enforcement team, not for you. You can report an unauthorised structure. The council may, or may not, choose to act.
Enforcement is discretionary. Councils weigh whether the breach causes real harm, whether it is expedient to pursue it, and whether the development might simply be granted retrospective permission anyway. Under the Town and Country Planning Act 1990, there are also time limits after which enforcement is no longer available at all. Many extensions that started without permission end up entirely lawful once time passes or a retrospective application succeeds.
So the honest position is this. Reporting the breach might slow your neighbour down or embarrass them. It will not order them to pay you a penny for lost light, and it will not, on its own, get the structure taken down for your benefit.
Where your genuine leverage actually sits
Your leverage lives in private property law, and it can be considerable. If your windows have acquired a right to light and the new structure causes a substantial interference, the test the courts apply comes from Colls v Home and Colonial Stores Ltd [1904] AC 179: not whether you have lost light, but whether you are left with enough for the ordinary use of the room.
Where interference is made out, two remedies are on the table. A court can award damages, or it can grant an injunction requiring the offending part of the building to come down. The Heaney case showed that a mandatory injunction to cut back a completed building is not a theoretical threat. In that case a nearly finished top floor was ordered removed.
This is where the planning story quietly re-enters, though not in the way most owners expect. A neighbour who built in a rush, without permission, and pressed on despite knowing about your windows, has behaved in a way courts notice. Conduct matters to the injunction question. In Ottercroft Ltd v Scandia Care Ltd [2016] EWCA Civ 867, a developer who acted high-handedly and ignored assurances was hit with an injunction even though the financial loss was modest. The lesson is that bad behaviour hardens a court's attitude.
So the missing planning permission is not the breach. It is evidence of the attitude behind the building work, and that attitude can shift a case from a payout towards an order to take the structure down.
Why timing decides more than the paperwork
The moment you notice the work matters more than the state of the planning file. Your position is strongest before the building is finished. Once walls are up and the structure is complete, a court weighs the waste of ordering demolition against your loss, and the balance can tip towards damages instead.
Delay is the quiet killer here. Sit and watch for months while the extension is completed, and you invite the argument that you acquiesced. Move early, on clear advice, and the injunction remains a live threat that drives a serious settlement.
This is the same principle that runs through how a rights of light matter moves through the courts. Credible, funded willingness to litigate, applied early, is what produces a settlement worth having. A report to the planning department is not that.
What to do when the structure has no permission
Start by separating the two problems in your own mind. Yes, report the planning breach if you wish; it costs little and occasionally helps. But do not treat it as your claim. Your claim, if you have one, is a private right to light matter, and it needs to be assessed on its own terms.
Get a proper rights of light analysis of your affected rooms. That is a technical Waldram analysis measuring the light lost to the working plane in each room, not a planning-style Daylight and Sunlight assessment, which answers a different question entirely. The two are frequently confused, and only one establishes your private right.
Then act before the structure is finished, or as close to it as you can manage. The unauthorised nature of the build may strengthen your hand on conduct, but it is the easement, the interference and the timing that decide the outcome.
Common questions
If I report my neighbour to the council, will they have to compensate me?
No. A planning enforcement report is a matter between your neighbour and the local authority. It cannot order compensation for lost light. Any payment for interference with your light comes through a separate private right to light claim, which stands or falls on the easement and the extent of the loss.
Can a building be ordered down if it never had planning permission?
A building can be ordered cut back or demolished where it substantially interferes with an established right to light, whether or not it had permission. The missing permission is not the trigger. The interference is. The lack of permission may, though, count against the neighbour on the question of conduct.
Does retrospective planning permission defeat my light claim?
No. If your neighbour obtains retrospective permission, that resolves the public planning issue. It does nothing to your private right to light. Planning permission has never given anyone the right to breach a neighbour's easement, and a later grant changes nothing about your position.
This article is general information about the law in England and Wales, not legal advice. Outcomes always depend on the facts.
Joshua Platt BSc (Hons) MRICS, Director, Daylight Protect
Daylight Protect is a fully funded rights of light claims business operating across England and Wales. We fund everything end to end, the surveyor, the solicitor, counsel and court fees, backed by legal insurance that covers the developer's costs if a claim fails, and we are paid only out of a successful settlement. We tell you when you have a claim, and just as plainly when you do not. Start a claim.
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