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21 Stafford Place London SW1E 6NP

25/08897/FULLFull Planning Permission ApplicationApproved
Full

Approved on 17 April 2026

Council decision: Application PermittedDelegated (officer decision)

Site boundary (council red line)

Proposal

Erection of mansard roof extension.

Received
8 December 2025
Decision level
Delegated (officer decision)
Public comments
3
Ward
St James's
Agent
HK HOME ARCHITECTS AND CONSULTANTS LTD
  1. Received8 Dec
  2. Validated8 Dec
  3. Consult.
  4. Target2 Feb
  5. Decided17 Apr

Decided in 130 days (council typically 49)

About this application

This is a full planning application for an extension at 21 Stafford Place London SW1E 6NP. Westminster has handled 4,484 applications of this type. This one was decided in 130 days, 12 weeks longer than Westminster's typical decision time. The site is in the Birdcage Walk conservation area, with 10 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 478 applications across St James's. We hold 526 applications in total for the SW1E postcode area.

86% of full 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
SW1E 6NP
Application type
Full Planning Permission Application
Scale / size
Small

Planning application dates

Date validated
8 December 2025
Consultation expiry
11 March 2026
Target decision date
2 February 2026

Applicant and agent

Agent
HK HOME ARCHITECTS AND CONSULTANTS LTD
Architect profile
HK HOME ARCHITECTS AND CONSULTANTS LTD
Agent address
Brentano Suite 720 Centennial Ave Elstree WD6 3SY United Kingdom

Planning decision

Statutory period
56 days

Publicity

Last advertised
18 February 2026
Advertisement expiry
11 March 2026

Additional information

Planning Portal ID
PP-14516025
Documents
33

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: Birdcage Walk
  • Listed building: Grade II: 14-20, Stafford Place Sw1On or next to this site
  • Article 4 direction: Article 4 Basement Development Permitted Rights Removed
  • Brownfield land register: 19 - 21 Catherine Place London SW1E 6DXRegister site at or near this address · +2 more
Also checked, none recorded (20)

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 and heritage coasts.

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.

Associated applications

  1. 2026
    14 Sep

    Variation of Condition 1 of planning permission dated 17 April 2026 (RN 25/08897/FULL

    ApprovedVariation of conditions (s73)26/06268/FULL
  2. 2025
    8 Dec

    Erection of mansard roof extension.

    This applicationApprovedFull25/08897/FULL

Source: Westminster

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

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