Housing stock in Kensington & Chelsea
Stucco terraces, mansion blocks, Georgian and early-Victorian townhouses — mostly Grade II.
Planning in Kensington & Chelsea
RBKC is the strictest planning authority in London for extensions. Mansard and dormer policy is tight, Article 4 removes PD in most zones, and heritage officers scrutinise everything.
Party Wall Act — what to expect
Mansard and dormer loft work almost always triggers major Party Wall Awards on both flanks — plan for surveyors on all sides.
Read the Party Wall etc. Act 1996 guide for full detail on notices, timelines and surveyor costs.
Typical costs in Kensington & Chelsea
For a mid-spec 25 m² rear dormer loft conversion, all-in (structural design, building control, party wall, VAT and 12% contingency), expect roughly £180,000 to £300,000. A mansard, a hip-to-gable with high-spec en-suite joinery or a conservation-area application will push above the top of this range; a self-built rooflight conversion comes in well under the bottom.
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