4 Buckingham Mews London SW1E 6NR Data via plota.co.uk
26/05833/FULL - Full Planning Permission Application
Pending
Proposal
Erection of a mansard roof extension. Data via plota.co.uk
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View original council record ↗Last checked
Application progress
✓
Received
25 Aug 2026
✓
Validated
4 Sept 2026
Decision
Expected by 30 Oct 2026
This application is under consideration - no decision has been issued yet. Plota predicts a decision between 23 Oct 2026 and 30 Oct 2026, from Westminster's recent extensions. Comments are open until 7 Oct 2026.
Comment on this application ↗Documents 21
Statements & assessments 4
PDF
SUSTAINABILITY DESIGN STATEMENT
Sustainability appraisal · 28 Aug 2026
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PDF
DESIGN AND ACCESS STATEMENT
Design and Access Statement · 25 Aug 2026
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PDF
HERITAGE STATEMENT
Heritage Statement · 25 Aug 2026
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PDF
FIRE STATEMENT EXCEPTION-SIGNED-SW1E 6NR
Background Papers · 25 Aug 2026
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Plans & drawings 9
PDF
LOCATIONPLAN
Location Plan · 25 Aug 2026
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PDF
A-105A-P4-PROPOSED 2-F & ROOF PLANS OPTION 1
Drawing · 25 Aug 2026
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PDF
A-101A-P3-PROPOSED SITE PLAN OPTION 1
Drawing · 25 Aug 2026
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PDF
A-107A-P3-PROPOSED ELEVATIONS
Drawing · 25 Aug 2026
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PDF
A-106-P3-EXISTING ELEVATIONS
Drawing · 25 Aug 2026
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PDF
A-104A-P2-PROPOSED G-F & 1-F PLANS OPTION 1
Drawing · 25 Aug 2026
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PDF
A-103-P3-EXISTING 2-F AND ROOF PLANS
Drawing · 25 Aug 2026
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PDF
A-100-P2-EXISTING SITE PLAN
Drawing · 25 Aug 2026
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PDF
A-102-P3-EXISTING G-F AND 1-F PLANS
Drawing · 25 Aug 2026
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Application forms 1
Consultation & comments 1
Other documents 6
PDF
ACK-GENERAL LETTER (G/P/C)
Background Papers · 4 Sept 2026
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PDF
CNSLT-LA SOCIETY
Background Papers · 4 Sept 2026
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CNSLT-LA SOCIETY
Background Papers · 4 Sept 2026
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SITE NOTICE 21 OR 28 DAYS IF T&C APPL.
Background Papers · 4 Sept 2026
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RECEIPT OF APPLICATION
Other · 28 Aug 2026
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1ST INVALID LETTER
Background Papers · 28 Aug 2026
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Site constraints 10
Grade II listed: 14-20, Stafford Place Sw1
List entry 1236634 · 15 m from the pin · 16 more listed buildings within 150 m (3 Grade I, 2 Grade II*, 11 Grade II)
Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.
Show the other 16 with distances
- 45 m4-6, Buckingham Gate Sw1Grade II
- 52 m7-9, Buckingham Gate Sw1Grade II
- 63 m13-15, Buckingham Gate Sw1Grade II
- 65 m16, Buckingham Gate Sw1Grade II*
- 67 mDuchy of Cornwall OfficeGrade II
- 69 m17, Buckingham Gate Sw1Grade II
- 76 mNobel HouseGrade II
- 85 m20, Buckingham Gate (Including Railings)Grade II
- 87 mBuckingham Palace Gates, Railings, Piers and Gate Piers With Lamps Fronting Buckingham Gate and As Entrance to Ambassadors' CourtGrade I
- 95 m22, Buckingham Gate Sw1Grade II
- 110 m1, Buckingham Gate Sw1Grade II
- 120 mBuckingham Gate Lodge,gate Piers,gates and RailingsGrade II*
- 122 mBuckingham Palace, Wall Linking Palace and Riding School, Along Buckingham Palace RoadGrade I
- 137 mPresbytery of Roman Catholic Church of St Peter and St EdwardGrade II
- 138 mRoman Catholic Church of St Peter and St EdwardGrade II
- 146 mSouth Screen to Buckingham Palace Forecourt Backing Onto Ambassadors' CourtGrade I
Flood zone 3, rivers and sea
High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Birdcage Walk conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Article 4 direction
Article 4 Basement Development Permitted Rights Removed. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Archaeological priority area: City of Westminster APA 3.2
An assessment or field evaluation may be asked for before ground works.
The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.
Air quality management area: Westminster AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Habitat network: Network Enhancement Zone 2
Where habitat is joined up enough to work as a network. Context, not a constraint on its own.
Central activities zone
The core of central London in the London Plan.
Offices, culture and the other strategic functions of the centre take priority over new housing here.
Registered park or garden 76 m away: Buckingham Palace
Its setting is a consideration for work nearby.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
Also on the record
Inside the City of Westminster built-up area.
Not affected
Not green belt · No scheduled monument at the site
Checked on 11 September 2026. Historic England, the Environment Agency, Natural England and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
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Important details
- Council
- Westminster
- Application type
- Full Planning Permission Application
- Postcode
- SW1E 6NR
- Received
- 25 Aug 2026
- Validated
- 4 Sept 2026
- Ward
- St James's
- Case officer
- Show
- Target decision
- 30 Oct 2026
- Applicant
- Show
- Agent
- HK HOME ARCHITECTS AND CONSULTANTS LTD
Decision outlook
Day 8 of the 56-day target. Westminster usually decides extensions by day 53.
Day 848 days to the 56-day target
62%decided within 8 weeks
87%approved
930decided in the last year
Plota live figures for extensions decided by Westminster in the last twelve months, from validation. Westminster decision record →
Public comments
No public comments yet.
9 neighbours consulted · Last counted 10 Sept 2026
Consultation & key dates
- Alt. reference
- PP-15133514
- Comments by
- 7 Oct 2026
- Site or press notice
- 16 Sept 2026
- Env. assessment
- No
Historical activity at this location
25 nearby applications on record - archival context, not part of the live application.
Within ~100m
Nearby activity
2025
Approved
20 Buckingham Gate London SW1E 6LB
Regulation 5 Notice of Intention to Install Fixed Line Broadband Apparatus to a Listed Bu…
2025
63 Catherine Place London SW1E 6DY
Use of the building as four flats (Class C3) and alterations to lower ground floor front…
2025
55 Catherine Place London SW1E 6DY
Use of first floor as commercial/office use. Installation of a flag pole between the firs…
2024
4 - 5 Buckingham Gate London SW1E 6JP
Use of the Building as an Embassy (sui generis) and associated external and internal alte…
2024
4 - 5 Buckingham Gate London SW1E 6JP
Use of the Building as an Embassy (sui generis) and associated external and internal alte…
2024
32 Catherine Place London SW1E 6HL
Replacement infill rear extension to lower ground floor and infill rear extension to grou…
2024
Approved
3 Buckingham Mews London SW1E 6NR
Erection of new mansard roof extension at front of building; installation of plant within…
2023
Approved
Buckingham Palace The Mall London SW1A 1AA
Display of two non-illuminated fascia signs measuring approximately 4.7m x 0.15m and 0.87…
2023
Approved
10 Buckingham Gate London SW1E 6LA
Repair works to the external elevations and the roof, including paint removal, works to t…
2023
Approved
1 Palace Street And 1 - 3 Buckingham Gate London SW1E 6JP
Removal and replacement of existing masonry paint and defective areas of stucco render an…
2023
Approved
6 Buckingham Mews London SW1E 6NR
Variation of Condition 1 of planning permission dated 12 December 2022 (RN: 22/03987/FULL…
2023
Approved
16 Buckingham Gate London SW1E 6LB
Alterations and repairs to roof.
2023
Approved
16 Stafford Place London SW1E 6NP
1x magnolia (T1, rear): crown reduce to the previous reduction points by up to 2 m
2023
Refused
13 Catherine Place London SW1E 6DX
Installation of an air conditioning unit within an acoustic enclosure at roof level.
2023
Approved
Flat 8 16 Catherine Place London SW1E 6HF
Rooftop external condenser unit within acoustic enclosure.
2023
Approved
4 - 5 Buckingham Gate London SW1E 6JP
External alterations including installation of new plant equipment and associated acousti…
2023
Approved
4 - 5 Buckingham Gate London SW1E 6JP
External alterations including installation of new plant equipment and associated acousti…
2022
Approved
Flat 8 16 Catherine Place London SW1E 6HF
Replacement of existing roof access structure with new roof structure (Flat 8).
2021
Approved
18 Stafford Place London SW1E 6NP
Variation of condition 1 and removal of condition 3 of planning permission dated 28 March…
2022
Approved
6 Buckingham Mews London SW1E 6NR
Conversion of ground floor garage to habitable accommodation and erection of mansard exte…
2016
Approved
20 Stafford Place London SW1E 6NP
Lime - substantial reduction to crown
2016
Approved
55A Catherine Place London SW1E 6DY
Installation of double-glazed windows in rear elevations.
2016
Approved
Basement 22 Buckingham Gate London SW1E 6PB
Change of use of part of lower ground floor of 21 Buckingham Gate as residential accomoda…
2016
Approved
21 Buckingham Gate London SW1E 6LS
Erection of lift overrun.
2016
Approved
Queens Gallery And Royal Kitchen Buckingham Palace The Mall London SW1A 1AA
Display of Dream Jar Sculpture measuring 800mm wide x 1000mm deep by 1279mm to 1840mm hig…
Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Householder decisions
Westminster is slower than most councils at deciding householder applications, ranking #258 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Westminster is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.
One of the strictest councils
only 81% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application.
View full council performance
Westminster decision statistics
Based on MHCLG data, the year to March 2026
86%
Overall approval rate
Below avg (87%) #201 of 296
81%
Householder approved
Below avg (90%) #277 of 296
44%
Decided in 8 weeks
Below avg (63%) #258 of 296
28%
Extended time limit
Below avg (41%) #46 of 296
83%
Minor dwellings approved
12 decided (1-9 homes)
67%
Major dwellings approved
3 decided (10+ homes)
81%
Change of use approved
133 decided
4,602
Total decisions
648 refused in the year to March 2026
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4 Buckingham Mews London SW1E 6NR
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