®Planning appeal decision
15 Upper Wimpole Street , London , W1G 6LR
Planning appeal 3374152 at 15 Upper Wimpole Street , London , W1G 6LR (City of Westminster Council) was dismissed on 12 May 2026 by Inspector Martinson P, by written representations. The main issue, as the Inspector framed it: Whether the proposed openable glass roof would preserve the Grade II listed building of 14-23, Upper Wimpole Street W1.
Infilling of courtyard between the main house and mews house at basement and ground level, installation of glazed sloping roof at rear ground floor level, addition of a glazed openable roof over the central lightwell at ground floor level, excavation benea th basement to provide swimming pool, creation of terrace at rear ground floor level with area of planting, creation of new door to facilitate access to terrace at rear first floor level, installation of plant equipment in roof space and at basement level, alterations to the façade and associated internal and external alterations, all in connection with existing dwelling house
- Authority
- City of Westminster Council
- Appeal type
- householder · Planning Appeal
- Procedure
- Written Representations
- Development
- residential · Householder developments
- Inspector
- Martinson P
- Postcode
- W1G 6LR
Main issues, as the Inspector framed them
- Whether the proposed openable glass roof would preserve the Grade II listed building of 14-23, Upper Wimpole Street W1
- Whether the proposal would preserve or enhance the character or appearance of the Harley Street Conservation Area
What decided it
The moderate public benefits of the proposal, including heritage improvements, were not sufficient to outweigh the harm to the significance of the Grade II listed building and the Conservation Area caused by the loss of the lightwell and disruption to the regular pattern and legibility of the rear elevation.
What the Inspector cited
- Development plan policies
- Policy 38Policy 39Policy 40
- National Planning Policy Framework
- Paragraph 215
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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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.