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55, Moreton Street, SW1V 2NY

26/01594/FULLFull planning permissionRefused
Full

Refused on 6 May 2026

4 reasons for refusal

Site boundary (council red line)

Proposal

Erection of a mansard roof to Nos. 55, 57 and 59 Moreton Street to create 3 x 1 bedroom flats (site includes Nos. 57 and 59).

Submitted
11 March 2026
  1. Received11 Mar
  2. Validated
  3. Consult.
  4. Target
  5. Decided6 May

Decided in 56 days (council typically 49)

About this application

This is a planning application at 55, Moreton Street, SW1V 2NY. Westminster has handled 804 applications of this type. This one was decided in 56 days, 7 days longer than Westminster's typical decision time. The site is in the Pimlico conservation area, with 1 listed building nearby. There are no previous applications recorded at this address. In the past year there have been 53 applications across PNW_22. We hold 1,120 applications in total for the SW1V postcode area.

84% of full planning permission 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.See what's approved near your address

Why it was refused

  1. Because of the detailed design and use of materials the proposed mansard extension would harm the appearance of these buildings and fail to maintain or improve (preserve or enhance) the character and appearance of the Pimlico Conservation Area. This would not meet Policies 42, 44 and 45 of the City Plan 2019 - 2040 (January 2026).
  2. The development fails to provide 20% of the floorspace as affordable housing or a payment in lieu to the Council's Affordable Housing Fund contrary to Policy 13 (F) of the City Plan 2019-2040 (January 2026) and our Planning Obligations and Affordable Housing SPD (February 2026) which seek to maximise the provision of affordable homes in Westminster.
  3. The proposed mansard roof would make the people living in Nos. 20 to 28 Lupus Street feel too shut in. This is because of its bulk, choice of materials (brickwork), height and how close it is to windows in those properties. This would not meet Policies 7 and 42 of the City Plan 2019 - 2040 (January 2026).
  4. Insufficient information has been submitted to demonstrate that the windows within Nos. 20, 22 and 24 would not experience a loss of daylight or sunlight. This would not meet Policies 7 and 42 of the City Plan 2019 - 2040 (January 2026).

From the council's decision notice.

Application details

Postcode
SW1V 2NY
Application type
Full planning permission

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

  • Flood zone 3: High probability (rivers and sea)
  • Conservation area: Pimlico
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
Also checked, none recorded (22)

flood storage areas, listed buildings, 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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