Postcode record · Westminster
SW1X 9HQ.
SW1X 9HQ has 11 known premises and 35 planning records — 28 approved of 32 decided (87.5%). 7 EPC records.
Postcode SW1X 9HQ · boundary not held, centred on the postcodeApprovedRefusedOther35 on the map — every match
At a glance · this postcodeWestminster profile →
11
Premises
known addresses (UPRNs)
35
Applications
32 decided
87.5%
Approval rate
28 approved · 4 refused
56 days
Median decision time
average 75 days · 34 dated decisions
7
EPC records
ratings D 7
35
Mapped applications
inside the postcode shape
Postcode unit boundary from Ordnance Survey; premises and applications inside it. Aggregates describe the area, not any single premises.
Property
What is it?
SW1X 9HQ has 11 known premises and 35 planning records — 28 approved of 32 decided (87.5%). 7 EPC records.
Premises
Name
Details
UPRN 100022820419
UPRN 100022820420
UPRN 100022820421
UPRN 100022820422
UPRN 100022820423
UPRN 100022820424
UPRN 100022820425
UPRN 100022820426
UPRN 100022820427
UPRN 100022820428
UPRN 100022820419
UPRN 100022820420
UPRN 100022820421
Show all 10 rows
UPRN 100022820422
UPRN 100022820423
UPRN 100022820424
UPRN 100022820425
UPRN 100022820426
UPRN 100022820427
UPRN 100022820428
Planning
What happened?
35 planning applications across the postcode; 28 approved of 32 decided (87.5%). Latest 30 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Erection of an infill extension at ground and first floor rear replacing the existing first floor enclosed balcony and the ground floor undercroft; installation of new rooflight on main roof.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Full Planning Permission Application
Approved
2025-12-17
Replacement of existing single glazed windows and doors with double glazed timber windows and doors.
45 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Certificate of Lawfulness (proposed)
Approved
2025-11-05
Confirmation that works to 2nd floor masonry walls constitutes a material operation to lawfully implement permission (RN:20/06905/APA), allowed on appeal dated 28 October 2021 (appeal ref. APP/X5990/D/21/3274155).
43 William Mews London SW1X 9HQ · premises record
Officer Lucy Russell
Certificate of Lawfulness (existing)
Withdrawn
2024-09-25
Details of Code of Construction Practice pursuant to Condition 3 of planning permission dated 15 Febraury 2023 (RN: 22/08519/FULL).
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approval of Details (Full PP)
Approved
2023-12-13
Details of a report for the management of the construction of the development pursuant to Condition 4 of planning permission granted at appeal dated 28 October 2021 (APP/X5990/D/21/3274155) (RN:21/00040/HASREF)
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approval of Details (Full PP)
Approved
2023-11-09
Excavation of a basement beneath the dwelling including provision of lightwells and alterations to fenestration.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Full Planning Permission Application
Approved
2022-12-16
Notification for prior approval under Part 1 Class AA of the General Permitted Development Order (2015) (as amended) for erection of a roof extension of the property by 3.5 metres with a matching roof pitch and materials to accommodate additional living space for the existing dwellinghouse.
43 William Mews London SW1X 9HQ · premises record
Officer Hayley White
Application prior approval - general
Refused
2020-10-30
Details showing evidence the development will be bound by the CoCP pursuant to Condition 3 of planning permission dated 3 June 2020 (RN: 20/00967/FULL).
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approval of Details (Full PP)
Approved
2020-08-17
Variation of condition 1 of planning permission dated 03 June 2020 (RN: 20/03898/FULL) for 'Demolition of the existing building and replacement with a new mews house, comprising basement, ground and first floors.' Namely, to allow amendments to replace the pavement lights with a walk-on rooflight and a metal grille and associated alterations at basement level.
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Full Planning Permission Application
Approved
2020-06-24
Demolition of the existing building and replacement with a new mews house, comprising basement, ground and first floors.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Full Planning Permission Application
Approved
2020-02-11
Erection of an infill extension at ground and first floor rear replacing the existing first floor enclosed balcony and the ground floor undercroft; installation of new rooflight on main roof.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Approved
2025-12-17
More
Full Planning Permission Application
Replacement of existing single glazed windows and doors with double glazed timber windows and doors.
45 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approved
2025-11-05
More
Certificate of Lawfulness (proposed)
Confirmation that works to 2nd floor masonry walls constitutes a material operation to lawfully implement permission (RN:20/06905/APA), allowed on appeal dated 28 October 2021 (appeal ref. APP/X5990/D/21/3274155).
43 William Mews London SW1X 9HQ · premises record
Officer Lucy Russell
Withdrawn
2024-09-25
More
Certificate of Lawfulness (existing)
Show all 10 rows
Details of Code of Construction Practice pursuant to Condition 3 of planning permission dated 15 Febraury 2023 (RN: 22/08519/FULL).
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approved
2023-12-13
More
Approval of Details (Full PP)
Details of a report for the management of the construction of the development pursuant to Condition 4 of planning permission granted at appeal dated 28 October 2021 (APP/X5990/D/21/3274155) (RN:21/00040/HASREF)
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approved
2023-11-09
More
Approval of Details (Full PP)
Excavation of a basement beneath the dwelling including provision of lightwells and alterations to fenestration.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Approved
2022-12-16
More
Full Planning Permission Application
Notification for prior approval under Part 1 Class AA of the General Permitted Development Order (2015) (as amended) for erection of a roof extension of the property by 3.5 metres with a matching roof pitch and materials to accommodate additional living space for the existing dwellinghouse.
43 William Mews London SW1X 9HQ · premises record
Officer Hayley White
Refused
2020-10-30
More
Application prior approval - general
Details showing evidence the development will be bound by the CoCP pursuant to Condition 3 of planning permission dated 3 June 2020 (RN: 20/00967/FULL).
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approved
2020-08-17
More
Approval of Details (Full PP)
Variation of condition 1 of planning permission dated 03 June 2020 (RN: 20/03898/FULL) for 'Demolition of the existing building and replacement with a new mews house, comprising basement, ground and first floors.' Namely, to allow amendments to replace the pavement lights with a walk-on rooflight and a metal grille and associated alterations at basement level.
43 William Mews London SW1X 9HQ · premises record
Officer Nikki Mitchell
Approved
2020-06-24
More
Full Planning Permission Application
Demolition of the existing building and replacement with a new mews house, comprising basement, ground and first floors.
43 William Mews London SW1X 9HQ · premises record
Officer Joshua Howitt
Approved
2020-02-11
More
Full Planning Permission Application
Building control
Building-control records are not yet collected for Westminster — the register is being gathered borough by borough (held so far: Lambeth, Brent, Ealing, Westminster, City and others).
Place
What affects it?
Every mapped designation touching a premises in this postcode, with how many of its 11 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Basement Development Permitted Rights Removed · reference 23/00006/REG_4 · covers 11 of 11 premises. Some normally permitted changes may require planning permission.
Conservation Area
Albert Gate · reference CONARA/1360 · covers 1 of 11 premises. Demolition, alterations, trees and design are subject to additional heritage controls.
Article 4 Direction Area
Article 4 Basement Development Permitted Rights Removed · reference 23/00006/REG_4 · covers 11 of 11 premises. Some normally permitted changes may require planning permission.
Conservation Area
Albert Gate · reference CONARA/1360 · covers 1 of 11 premises. Demolition, alterations, trees and design are subject to additional heritage controls.
Nearby postcodes and streets
Walk to the next area — linked where the Atlas has a record for it (pilot borough only for now).
People
Who is involved?
Named on the latest 30 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Case officer on 11 applications
Case officer on 5 applications
Case officer on 4 applications
Case officer on 3 applications
Case officer on 3 applications
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 11 applications
Case officer on 5 applications
Case officer on 4 applications
Show all 9 rows
Case officer on 3 applications
Case officer on 3 applications
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Case officer on 1 application
Development
What could it become?
Planning precedent35 applications and 35 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy7 EPC records; ratings D: 7.
What is not assertedNo capacity, value or ownership claim is made at area level; those belong to individual premises records and their evidence.
Intent signals
Planning Atlas ProOwnership, finance and market signals recorded at addresses in this postcode — each with date and source. Signals are evidence of change, not a prediction.
Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.