Westminster's central London character is anchored by iconic Georgian and Regency stucco terraces across Mayfair, Belgravia, Marylebone, Pimlico, and Bayswater, Victorian mansion blocks throughout the borough, and active mews redevelopment behind the principal streets. Almost all the residential stock carries windows that have received natural light for well over the 20 years required to acquire the easement under the Prescription Act 1832, which means mansion block additions, mews redevelopment, and tall-building schemes all routinely raise complex rights of light questions. City of Westminster planning consent does not address that legal position.
We act on Westminster schemes from the London head office, with reach across Mayfair, Marylebone, Soho, and Pimlico, supported by colleagues in Essex and Hampshire. CHP is RICS regulated and has been advising on rights of light since 2004. The London team handles this work with specialist focus, and where rooftop or upper-floor work is in play we can bring in airspace development advice from the same team.
The starting point on every Westminster project is a free initial assessment to identify which neighbouring windows could be affected by the proposed scheme and which carry the 20-year easement. From there, we use specialist rights of light software to model existing and proposed light levels for each affected room, with the results tested against the Equivalent First Zone and the 50/50 rule to quantify any loss in legal terms.
Where the figures show a likely infringement, the cutback analysis tests design variations including reduced height, set-back upper floors, and adjusted fenestration until the scheme sits within acceptable limits. Conservation area and listed building constraints in Westminster often shape the cutback options available, and our rights of light assessments overview sets out the broader method for design teams working on the historic stock. The bespoke surveying service means each scope is set against the specific Westminster project.
An infringement does not automatically stop a Westminster scheme, but it does expose the developer to either an injunction, which can require alteration or in extreme cases demolition of the offending part of the building, or a damages award calculated as a share of the development profit attributable to the lost light. In central London, those damages can be substantial. Most matters resolve through negotiation, with a release of rights agreed in return for a settlement payment to the adjoining owner.
Quantifying the position before drawings are signed off gives the design team room to cut back massing, reposition windows, or rework the upper floors at a stage when changes are still affordable. Most Westminster schemes also call for daylight and sunlight reports as part of the same planning submission, and we run both pieces of work from the same team.
