Planning appeal decision
37-41 Mortimer House, London, W1T 3JH
Planning appeal 3314858 at 37-41 Mortimer House, London, W1T 3JH (City of Westminster Council) was dismissed on 4 September 2023 by Inspector Russell M, by written representations. The main issue, as the Inspector framed it: Whether the proposal would preserve or enhance the character or appearance of the East Marylebone Conservation Area.
the installation of a roof awning at roof level
- Authority
- City of Westminster Council
- Appeal type
- minor · Planning Appeal
- Procedure
- Written Representations
- Development
- other · Other minor developments
- Inspector
- Russell M
- Postcode
- W1T 3JH
Main issues, as the Inspector framed them
- Whether the proposal would preserve or enhance the character or appearance of the East Marylebone Conservation Area
What decided it
The public benefits of the proposal, comprising enabling year-round use of the terrace and potential carbon footprint reduction, were insufficient to outweigh the less than substantial harm to the character and appearance of the conservation area caused by the incongruous and unsympathetic design of the awning structure.
What the Inspector cited
- Development plan policies
- Policy 38 (Design principles)Policy 39 (Westminster's heritage)Policy 40 (Townscape and architecture)
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
Town Planner Pro holds this letter. The Appeals plan opens it and every other letter we hold, all of them searchable, with the main issues and what decided each case picked out. We do not show letters on the free site because they carry people’s names and addresses.
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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