Planning appeal decision
6 St Mark's Place, London, W11 1NS
Planning appeal 3308259 at 6 St Mark's Place, London, W11 1NS (Royal Borough of Kensington and Chelsea) was dismissed on 16 February 2023 by Inspector Deane G, by written representations. The main issue, as the Inspector framed it: The effect of the proposed development on the character and appearance of the host building and the local area.
the erection of a single storey infill extension at lower ground floor with a roof terrace and garden access from upper ground floor, roof extension and associated internal & external alterations
- Appeal type
- householder · Householder (HAS)
- Procedure
- Written Representations
- Development
- residential · Householder developments
- Inspector
- Deane G
- Postcode
- W11 1NS
Main issues, as the Inspector framed them
- The effect of the proposed development on the character and appearance of the host building and the local area
What decided it
The proposed mansard roof extension would cause significant harm to the character and appearance of the conservation area and the host building by disrupting the established roofscape and architectural composition of the terrace, with no public benefits to outweigh this harm.
What the Inspector cited
- Development plan policies
- Policy CL1Policy CL2Policy CL3Policy CL6Policy CL8Policy CL11
How the Inspector dealt with each one is set out in the app, in order: the development plan, national policy, housing land supply, other considerations and the planning balance, beside the letter.
See how each was appliedThe decision letter
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What an account adds to this decision


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The main issues, what decided it, the planning balance and the policies and judgments listed as cited are read from the published letter by Town Planner Pro and are our summary, not the Inspector’s words; the letter itself is the record. Contains public sector information licensed under the Open Government Licence v3.0. Research, not advice.
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