Planning appeal decision
Apartment 801, 1 Ashburton Place, London, W1J 8AS
Planning appeal 3269761 at Apartment 801, 1 Ashburton Place, London, W1J 8AS (City of Westminster Council) was dismissed on 25 October 2021 by Inspector Whelan P, by written representations. The main issue, as the Inspector framed it: The effect of the development on the Mayfair Conservation Area.
the erection of an extension at roof level to create a winter garden
- Authority
- City of Westminster Council
- Appeal type
- minor · Planning Appeal
- Procedure
- Written Representations
- Development
- residential · Other minor developments
- Inspector
- Whelan P
- Postcode
- W1J 8AS
Main issues, as the Inspector framed them
- The effect of the development on the Mayfair Conservation Area
- The effect of the development on the settings of Green Park and the Royal Parks Conservation Area
What decided it
The harm to the architectural order and symmetry of the Mayfair Conservation Area and the setting of Green Park, characterised as less than substantial but of considerable importance, was not outweighed by the private and limited public benefits of the proposal.
The less than substantial but considerable harm to the Mayfair Conservation Area and the setting of Green Park and the Royal Parks Conservation Area was not outweighed by the private benefit to the flat occupier and modest economic benefit from construction work.
What the Inspector cited
- Development plan policies
- Policy 38Policy 39Policy 40
- National Planning Policy Framework
- Paragraph 199Paragraph 202Paragraph 197
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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With an account
What an account adds to this decision


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- Allowed21 October 2026601140517 Bruton Street, London, W1J 6QB
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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