®Planning appeal decision
18 Mortimer Street, Basement And Ground Floor Maisonette, London, W1T 3JN
Planning appeal 3310847 at 18 Mortimer Street, Basement And Ground Floor Maisonette, London, W1T 3JN (City of Westminster Council) was dismissed on 9 June 2023 by Inspector Robbie K, by written representations. The main issue, as the Inspector framed it: Whether the proposed development would preserve or enhance the character or appearance of the East Marylebone Conservation Area.
The proposal is to make environmental improvements at 18 Mortimer Street. It is important to understand that the Council does grant planning permission as the heat loss reduction achieved, does meet the Council’s aim of improving environmental performance, at ground floor, 18 Mortimer Street, W1T 3JN, located in a conservation area, by the installation of energy efficient double glazing in aluminium mullions from floor to ceiling to replace and upgrade the existing thermally non-compliant single glass in internal metal mullions from floor to ceiling
- Authority
- City of Westminster Council
- Appeal type
- minor · Planning Appeal
- Procedure
- Written Representations
- Development
- other · Other minor developments
- Inspector
- Robbie K
- Postcode
- W1T 3JN
Main issues, as the Inspector framed them
- Whether the proposed development would preserve or enhance the character or appearance of the East Marylebone Conservation Area
What decided it
The public and private benefits of improved thermal efficiency and easier maintenance are insufficient to outweigh the less than substantial harm to the character and appearance of the conservation area caused by the unsympathetic replacement shopfront design.
What the Inspector cited
- Development plan policies
- Policy 38Policy 39Policy 40Policy PR1Policy B2
- National Planning Policy Framework
- Paragraph 197Paragraph 202
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
More decisions in City of Westminster Council
The authority’s record since 2016 · every decision in 2023
- Dismissed28 October 202660123391 Bear Street, London, WC2H 7DZ
- Dismissed28 October 2026600992025 Monmouth Road, London, W2 4UT
- Dismissed21 October 20266014604South Terrace, Third and Fourth Floor, 4 Matthew Parker Street, London, SW1H 9NP
- Dismissed21 October 20266012002Flat B, 9 Durham Terrace, London, W2 5PB
- 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.