Alliance House 12 Caxton Street London SW1H 0QL Data via plota.co.uk

25/05026/FULL - Full Planning Permission Application Approved

Proposal

Extensions to sides and rear at third to sixth floor levels; roof extension; roof terraces at fifth, sixth and seventh (roof) floor levels; alterations to existing entrance doors; new external fire escape staircase; new window openings to rear elevation; and replacement and relocation of external plant and services. Data via plota.co.uk

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View original council record ↗Last checked 29 Oct 2026, 04:00

Street View

Application progress

✓

Received

18 Jul 2025

✓

Approved

10 Oct 2025

Approved on 10 Oct 2025 · Delegated Decision · Last checked 29 Oct 2026

Documents 64

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 10 Oct 2025 View ↗ PDF DELEGATED REPORT Report · 10 Oct 2025 View ↗

Statements & assessments 12

Plans & drawings 31

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 18 Jul 2025 View ↗

Consultation & comments 6

PDF TREE COMMENTS Consultee Comment · 5 Sept 2025 View ↗ PDF ENVIRONMENT AGENCY RESPONSE Consultee Comment · 18 Aug 2025 View ↗ PDF TFL COMMENT Consultee Comment · 8 Aug 2025 View ↗ PDF ECNSLT-STD EXT CONSULTEES Background Papers · 30 Jul 2025 View ↗ PDF ECNSLT-STD EXT CONSULTEES Background Papers · 29 Jul 2025 View ↗ PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 29 Jul 2025 View ↗

Site constraints 13

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.

Flood map ↗

Broadway And Christchurch Gardens 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.

Council document ↗

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 Named permitted development rights are withdrawn here.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 2.8

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.

Council record ↗

6 listed buildings within 150 m

Nearest: Caxton Hall, Grade II, 18 m away · 2 Grade I, 4 Grade II

The site itself is not listed. 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 all 6 with distances

18 mCaxton HallGrade II
30 mLondon Underground Headquarters Including St James's Park Underground StationGrade I
44 mBluecoat School (National Trust)Grade I
56 mSt Ermin's HotelGrade II
103 m58 and 58a, Petty France Sw1Grade II
103 mThe Albert Public HouseGrade II

Historic England ↗

National infrastructure project 563 m away: Thames Tideway Tunnel

The site is 563 m from the project boundary. Waste water treatment, decided. The project page says whether consent was granted. Also within 2 km: London Strategic Heat Main Project (at pre-application, 513 m).

Nationally significant infrastructure projects (power stations, electricity lines, pipelines, major roads and railways, harbours, airports and reservoirs) are consented by a Secretary of State under the Planning Act 2008, after an examination by the Planning Inspectorate, rather than by the council. The boundary is the one the Inspectorate consults on and can change as the scheme does. Projects are shown within 2 km of the site.

Planning Inspectorate project page ↗

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.

Also on the record

Registered park or garden 214 m away: St James's Park; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Town centre 23 m away: Victoria Street.

Not affected

Not green belt · No scheduled monument at the site

Checked on 1 November 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) 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: SW1H 0QL
Received: 18 Jul 2025
Validated: 18 Jul 2025
Ward: St James's
Case officer: Show
Target decision: 10 Oct 2025
Decision: Application Permitted
Decision date: 10 Oct 2025
Decision level: Delegated Decision
Applicant: Show
Agent: Purcell

How this decision compares

Decided in 84 days from validation, 8 days slower than Westminster's median of 76 for full applications. Approved, as 86% of full applications here are.

This one84d

Council76d

UK57d

35%decided within 8 weeks

86%approved

2,198decided in the last year

Plota live figures for full applications decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

No public comments yet.

83 neighbours consulted · Last counted 29 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference: PP-13616386
Planning Portal ref: PP-13616386
Comments by: 27 Aug 2025
Site or press notice: 6 Aug 2025
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

2 - 14 Palmer Street London SW1H 0AP

Variation of conditions 1, 11, 13, 19, 20, 21, 22, 23 of planning permission dated 11 Mar…

25/07949/FULL 3 Nov 2025

2025

Albany House 98 Petty France London SW1H 9EA

Refurbishment, alterations and extensions including demolition of existing sixth floor to…

25/07812/FULL 28 Oct 2025

2025 Approved

Jolly St Ermins Hotel Caxton Street London SW1H 0QW

Internal alterations to the Caxton Restaurant including redecoration, refurnishing and ad…

25/01946/LBC 15 Apr 2025

2025

1A Broadway London SW1H 0AZ

Display of externally illuminated fascia sign measuring 0.9m x 12.1m, display of internal…

25/01538/ADV 6 Mar 2025

2024

1 Brewer's Green London SW1H 0RH

Variation of condition 4 of planning permission dated 10th October 2022 (RN:22/06821/TCH)…

24/05863/FULL 22 Aug 2024

2024

Burwood House 14 - 16 Caxton Street London

Refurbishment of existing office building including replacement entrance doors at ground…

24/05776/FULL 20 Aug 2024

2023 Approved

16-18 Palmer Street London SW1H 0AD

Use of an area of the public highway measuring 7.6m x 2.2m for the placing of six tables…

23/08957/TCH 15 Feb 2024

2023 Approved

58 Buckingham Gate London SW1E 6AJ

Use of the building for office purposes (Class E).

23/05173/FULL 16 Nov 2023

2023 Approved

21 Palmer Street London SW1H 0AD

Installation of an external enclosure to house five additional condenser units at the bas…

23/04413/FULL 10 Aug 2023

2022 Approved

63 Buckingham Gate London SW1E 6AS

7 x silver birch in rooftop garden. Reduce height by 2-3m and spread by 1.5m. Thin remain…

22/04604/TCA 21 Jul 2022

2022 Approved

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Display of three monolith structures wrapped in vinyl promoting Christchurch Gardens incl…

22/04279/ADV 20 Jul 2022

2022 Approved

1 Brewer's Green London SW1H 0RH

Display of a non illuminated transparent sticker measuring 160mm X 90mm on three table to…

22/01180/ADV 17 May 2022

2022 Approved

1 Brewer's Green London SW1H 0RH

Temporary placement of 3 tables and 9 chairs at the rear of the Blewcoat School building…

22/01178/TCH 17 May 2022

2021 Refused

26-32 Caxton Street London SW1H 0RJ

Removal of existing windows and replacement with doors and installation of glazed balustr…

21/08453/FULL 4 Mar 2022

2021 Approved

16-18 Palmer Street London SW1H 0AD

Use of an area of the public highway for the placing of six tables, twelve chairs, two ba…

21/08665/TCH 17 Feb 2022

2021 Approved

1 Broadway London SW1H 0AY

Removal of 15 existing antennas and installation of 12 Antenna on the roof of the Westmin…

21/02207/FULL 29 Nov 2021

2021 Approved

Albany House 98 Petty France London SW1H 9EA

Installation of six antennas (top height of antennas 41.20m AGL/43.55M AGL on 2.5m and 3…

21/05344/TELCOM 30 Sep 2021

2021 Approved

The Blewcoat School 23 Caxton Street London SW1H 0PY

Internal alterations to lower ground floor, including replacement WCs, installation and r…

21/04465/LBC 26 Aug 2021

2021 Approved

1 Broadway London SW1H 0AY

Removal of existing six Telefonica O2 antennas at 34.8m and three Telefonica O2 antennas…

21/02244/TELCOM 1 Jun 2021

2021 Approved

Albany House 98 Petty France London SW1H 9EA

Removal of three antennas and installation of six antennas; together with one replacement…

21/01694/TELCOM 6 May 2021

2016 Approved

Vandon Court 64 Petty France London SW1H 9HE

Replacement of the existing single glazed 'crittal' style windows with modern double glaz…

16/00191/FULL 16 Jun 2016

2016 Approved

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Display of four internally illuminated and five externally illuminated advertisements on…

16/05067/ADV 15 Jun 2016

2016 Approved

22-24 Caxton Street London SW1H 0QU

Use of the public highway for the placing of four tables and eight chairs in two areas me…

16/03928/FULL 8 Jun 2016

2016 Approved

Broadway London

Display of Dream Jar Sculpture measuring 800mm-1000mm by 1279mm-1840mm with three plaques…

16/02934/ADV 13 May 2016

2016 Approved

1 Broadway London SW1H 0AY

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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

Alliance House 12 Caxton Street London SW1H 0QL Data via plota.co.uk

Proposal

Application progress

Documents 64

Decision & officer reports 2

Statements & assessments 12

Plans & drawings 31

Application forms 1

Consultation & comments 6

Other documents 12

Site constraints 13

Nearby new applications

Important details

How this decision compares

Public comments

Consultation & key dates

Nearby activity