Postcode record · Westminster
SW1X 9HF.
SW1X 9HF has 26 known premises and 29 planning records — 19 approved of 21 decided (90.5%). 17 EPC records.
Postcode SW1X 9HF · boundary not held, centred on the postcodeApprovedRefusedOther36 on the map — every match
At a glance · this postcodeWestminster profile →
26
Premises
known addresses (UPRNs)
29
Applications
21 decided
90.5%
Approval rate
19 approved · 2 refused
70 days
Median decision time
average 100 days · 25 dated decisions
17
EPC records
ratings C 6 · D 9 · E 2
36
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 9HF has 26 known premises and 29 planning records — 19 approved of 21 decided (90.5%). 17 EPC records.
Premises (18 of 26 shown)
Name
Details
UPRN 10033550128
UPRN 10033550868
UPRN 10033550869
UPRN 10033598447
UPRN 100022820400
UPRN 100022820401
UPRN 100022820402
UPRN 100022820403
UPRN 100022820404
UPRN 100022820405
UPRN 10033550128
UPRN 10033550868
UPRN 10033550869
Show all 10 rows
UPRN 10033598447
UPRN 100022820400
UPRN 100022820401
UPRN 100022820402
UPRN 100022820403
UPRN 100022820404
UPRN 100022820405
Planning
What happened?
29 planning applications across the postcode; 19 approved of 21 decided (90.5%). Latest 29 shown.
Reference
Proposal · address
Type
Outcome
Date · distance
Amendments to planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.; NAMELY minor amendments to the ground floor front elevation including revisions to the approved window openings, together with associated minor internal reconfiguration works.
17 William Mews London SW1X 9HF · premises record
Officer Zulekha Hosenally
Non-material amendments
Pending
2026-05-05
Erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.
17 William Mews London SW1X 9HF · premises record
Officer Zulekha Hosenally
Full Planning Permission Application
Approved
2024-10-28
Installation of an air conditioning unit and enclosure at third floor roof level.
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Full Planning Permission Application
Approved
2017-03-14
Erection of first and second floor extension to William Mews elevation, replacement of windows, addition of balconies at first and second floor levels, replacement of bay window to rear, relocation of entrance door, and erection of third floor mansard roof extension all in connection with continued use as a single family dwellinghouse (Class C3)
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Full Planning Permission Application
Approved
2016-05-13
Erection of first and second floor extension to William Mews elevation, replacement of windows, addition of balconies at first and second floor levels, replacement of bay window to rear and relocation of entrance door in connection with use as a single family dwellinghouse.
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Full Planning Permission Application
Approved
2014-07-30
Erection of a single storey extension at third floor level and infill of existing recessed area at ground to second floor level fronting William Mews to provide additional residential accommodation. Installation of balconies to the existing windows on the front elevation and relocation of front door.
25 William Mews London SW1X 9HF · premises record
Officer Vincent Nally
Full Planning Permission Application
Withdrawn
2011-03-23
Retention of balconies at second and third floors and associated elevational alterations.
24 William Mews London SW1X 9HF · premises record
Officer Louise Francis
Full Planning Permission Application
Approved
2009-04-07
Erection of mansard roof extension including new balcony to front elevation and new windows to front and rear.
25 William Mews London SW1X 9HF · premises record
Officer Vincent Nally
Full Planning Permission Application
Withdrawn
2008-08-26
Erection of roof extension to provide additional residential accommodation and terrace at third floor level.
22 William Mews London SW1X 9HF · premises record
Officer Louise Francis
Full Planning Permission Application
Approved
2007-05-25
Erection of two storey extension at second and third floor level with roof terrace at front third floor level (minor alterations to scheme approved 16.11.06).
24 William Mews London SW1X 9HF · premises record
Full
Unknown
2006-12-27
Amendments to planning permission dated 12 June 2025 (RN: 24/07507/FULL) for the erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.; NAMELY minor amendments to the ground floor front elevation including revisions to the approved window openings, together with associated minor internal reconfiguration works.
17 William Mews London SW1X 9HF · premises record
Officer Zulekha Hosenally
Pending
2026-05-05
More
Non-material amendments
Erection of a roof extension and alterations to existing front elevation and fenestration. Excavation of a new basement below part existing dwellinghouse.
17 William Mews London SW1X 9HF · premises record
Officer Zulekha Hosenally
Approved
2024-10-28
More
Full Planning Permission Application
Installation of an air conditioning unit and enclosure at third floor roof level.
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Approved
2017-03-14
More
Full Planning Permission Application
Show all 10 rows
Erection of first and second floor extension to William Mews elevation, replacement of windows, addition of balconies at first and second floor levels, replacement of bay window to rear, relocation of entrance door, and erection of third floor mansard roof extension all in connection with continued use as a single family dwellinghouse (Class C3)
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Approved
2016-05-13
More
Full Planning Permission Application
Erection of first and second floor extension to William Mews elevation, replacement of windows, addition of balconies at first and second floor levels, replacement of bay window to rear and relocation of entrance door in connection with use as a single family dwellinghouse.
25 William Mews London SW1X 9HF · premises record
Officer Sebastian Knox
Approved
2014-07-30
More
Full Planning Permission Application
Erection of a single storey extension at third floor level and infill of existing recessed area at ground to second floor level fronting William Mews to provide additional residential accommodation. Installation of balconies to the existing windows on the front elevation and relocation of front door.
25 William Mews London SW1X 9HF · premises record
Officer Vincent Nally
Withdrawn
2011-03-23
More
Full Planning Permission Application
Retention of balconies at second and third floors and associated elevational alterations.
24 William Mews London SW1X 9HF · premises record
Officer Louise Francis
Approved
2009-04-07
More
Full Planning Permission Application
Erection of mansard roof extension including new balcony to front elevation and new windows to front and rear.
25 William Mews London SW1X 9HF · premises record
Officer Vincent Nally
Withdrawn
2008-08-26
More
Full Planning Permission Application
Erection of roof extension to provide additional residential accommodation and terrace at third floor level.
22 William Mews London SW1X 9HF · premises record
Officer Louise Francis
Approved
2007-05-25
More
Full Planning Permission Application
Erection of two storey extension at second and third floor level with roof terrace at front third floor level (minor alterations to scheme approved 16.11.06).
24 William Mews London SW1X 9HF · premises record
Unknown
2006-12-27
More
Full
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 26 premises each one covers.
Designation
Coverage
Article 4 Direction Area
Article 4 Basement Development Permitted Rights Removed · reference 23/00006/REG_4 · covers 26 of 26 premises. Some normally permitted changes may require planning permission.
Article 4 Direction Area
Article 4 Basement Development Permitted Rights Removed · reference 23/00006/REG_4 · covers 26 of 26 premises. Some normally permitted changes may require planning permission.
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 29 applications in this postcode — the party who applied, not the owner or occupier.
Name
Details
Case officer on 5 applications
Case officer on 3 applications
Case officer on 3 applications
Case officer on 3 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 1 application
Case officer on 1 application
Case officer on 5 applications
Case officer on 3 applications
Case officer on 3 applications
Show all 10 rows
Case officer on 3 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 2 applications
Case officer on 1 application
Case officer on 1 application
Development
What could it become?
Planning precedent29 applications and 36 mapped decisions in this postcode — precedent for what has been permitted and refused here.
Energy17 EPC records; ratings C: 6, D: 9, E: 2.
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.
5 intent signals recorded in this postcode
Repeat sale · Long hold · Ageing director
Subscribe to see the signals →Boundary: OS Postcode Unit areas (Ordnance Survey), 2026-08-14. Planning records: canonical stage2. EPC: EPC register. Premises: OS AddressBase / UPRN.