How Developers Negotiate Rights of Light Damages and Share of Profit

By Margaret Shields · 10 August 2026

When a developer infringes your right of light, the question of how much you should receive in compensation is only part of the picture. The real battleground, and the part most property owners know least about, is how developers and their advisers approach the negotiation itself. Understanding the tactics, frameworks and financial logic behind these discussions puts you in a much stronger position.

Most rights of light disputes settle without going to court. That might sound reassuring, but it also means the negotiation phase is where the outcome is really decided. Developers know this, and they prepare accordingly. If you want to understand rights of light in depth, grasping the negotiation process is just as important as knowing the law.

The starting point in most negotiations is what lawyers and surveyors call the "book value" of the light lost. This is typically calculated using the Waldram diagram method, which measures how much additional sky visibility your room loses because of the new building. A surveyor will assess the before and after positions and express the loss in terms of the area of your room that falls below adequate daylight. But this technical figure is just the opening position.

Developers will often propose compensation based on a share of the profit they stand to make from the part of their building that causes the infringement. This is sometimes referred to as the "negotiating damages" approach. Courts have endorsed this method in cases like Tamares (Vincent Square) Ltd v Fairpoint Properties (Vincent Square) Ltd, where the judge considered what a willing buyer and willing seller would have agreed in a hypothetical negotiation to release the right of light. The typical range discussed in practice is somewhere between a third and a half of the developer's profit attributable to the infringing part of the scheme, though every case turns on its own facts.

What many property owners do not realise is that the developer's profit figure itself is often contested. Developers will present cost breakdowns that minimise the apparent profit from the offending floors or massing. They may allocate shared costs in ways that reduce the surplus. Your surveyor needs to scrutinise these figures carefully. You can learn more about how compensation is calculated and why the methodology matters so much in reaching a fair figure.

Another common tactic is for developers to argue that planning constraints or other factors would have limited the building's height or massing anyway, reducing the value of your right to block the development. They may also point to the risk that a court would award damages rather than an injunction, using the principles from Shelfer v City of London Electric Lighting Co and the more recent Supreme Court decision in Coventry v Lawrence. If a court is unlikely to grant an injunction, your leverage drops significantly, and the developer knows it.

Timing plays a huge role. If the developer approaches you before construction begins, you generally have more bargaining power. Once the building is up, your position changes. The court is less likely to order demolition of a completed structure, which means the developer's risk is lower and so is their willingness to pay a premium. That said, you still have a claim for damages even after construction, so do not assume the window has closed entirely.

Some developers will make early offers that seem generous but actually fall well below what a proper assessment would support. Others will delay, hoping you lose patience or miss limitation deadlines. Having a surveyor who understands both the technical and commercial side of these disputes is essential. You should also consider your legal rights as a property owner before entering any negotiation or signing a release.

The share of profit approach is not the only method. In some cases, particularly where the loss is modest or the property is residential, compensation may be assessed on a diminution in value basis. This looks at how much your property has dropped in value because of the reduced light. In practice, the share of profit method usually produces a higher figure, which is why claimants and their advisers tend to favour it.

If you have received an approach from a developer or suspect your light may be affected by a nearby scheme, the single most important step is to get a proper assessment done early. You can request a free assessment to understand where you stand before any negotiation begins. Acting quickly protects your position and gives your advisers the best chance of securing a fair outcome.

Reference: Tamares (Vincent Square) Ltd v Fairpoint Properties (Vincent Square) Ltd [2007] 1 WLR 2148; Shelfer v City of London Electric Lighting Co [1895] 1 Ch 287; Coventry v Lawrence [2014] UKSC 13