Converting the top-floor flat of a London mansion block is one of the most complex and rewarding loft conversion projects available. Done well, it creates some of the most spectacular residential spaces in the capital — high above the street, with genuine airiness and light. Done poorly, it can be a planning and legal nightmare. Prime Loft has specialist experience across London’s mansion block housing stock.
In most cases, the roof space above a top-floor flat is owned by the freeholder, not the leaseholder. Obtaining a licence to alter — and in some cases purchasing the airspace — is a legal prerequisite before any planning application can be submitted.
All works affecting the structure or fabric of the building require compliance with the Party Wall Act. In a mansion block, multiple neighbours may be affected — both above (impossible if it’s the top floor) and to the sides and below.
Most Victorian and Edwardian mansion blocks in London are either listed or within conservation areas. Planning applications for these buildings are amongst the most complex our team handles — and amongst those where experience and relationships with local planning officers matter most.
Mansion block roofs are often built of older, heavier materials — traditional timber roofs with lead coverings, for example. Structural work must be designed sensitively and often approved by the building’s own structural engineer in addition to the local authority.
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