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12 Duke Street St James's London SW1Y 6BN

17/07827/NMANon-material amendmentsRefused
Discharge / amendments

Refused on 27 September 2017

Council decision: Application RefusedDelegated (officer decision)

Approximate site (title boundary)
Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

Proposal

Amendments to planning permission dated 23 December 2015 (RN: 15/09261) for lowering of the basement floor level, erection of three storey rear extension at first, second and third floor levels, enlargement of the top/fourth floor mansard roof and creation of roof terrace at fourth floor level, and installation of mechanical plant at roof level in connection with the amalgamation of Nos. 12 and 13 to create a single art gallery at basement and ground floor level, with ancillary offices at first and second floor levels and creation of a self-contained residential flat (Class C3) at third and fourth floor levels. NAMELY, amend design of rear entrance, additional grate, and reduction size of the approved window.

Received
31 August 2017
Decision level
Delegated (officer decision)
Ward
St James's
Agent
Tomef Design Limited
  1. Received31 Aug
  2. Validated31 Aug
  3. Consult.
  4. Target28 Sep
  5. Decided27 Sep

Decided in 27 days (council typically 49)

About this application

This is an application to amend a permission at 12 Duke Street St James's London SW1Y 6BN. Westminster has handled 604 applications of this type. This one was decided in 27 days, 3 weeks quicker than Westminster's typical decision time. The site is in the St James's conservation area, with 14 listed buildings nearby. There have been 2 other applications at this address. In the past year there have been 478 applications across St James's. We hold 969 applications in total for the SW1Y postcode area.

88% of amendment applications at City of Westminster were approved. Across all application types, the council typically decides in about 7 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode
SW1Y 6BN
Application type
Non-material amendments
Scale / size
Small

Planning application dates

Date validated
31 August 2017
Target decision date
28 September 2017

Applicant and agent

Agent
Tomef Design Limited
Agent address
Unit 133-134 World's End Studios 132-134 Lots Road London SW10 0RJ

Planning decision

Statutory period
28 days

Additional information

Planning Portal ID
PP-06291191
Comments
0
Documents
10

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Conservation area: St James's
  • Listed building: Grade II: 11, Duke StreetOn or next to this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (21)

flood storage areas, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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