20 - 21 Cavendish Square London W1G 0RN Data via plota.co.uk
26/03510/LBC - Listed Building Consent Application
Approved
Proposal
Installation of replacement roof top plant with a dummy mansard roof extension, replacement plant at ground floor and new third floor roof structure and new substation at the lower ground floor. [Linked to 26/03509/FULL] Data via plota.co.uk
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Application progress
✓
Received
28 May 2026
✓
Approved
8 Jul 2026
Approved on 8 Jul 2026 · Delegated Decision · Last checked 11 Jul 2026
Documents 37
Decision & officer reports 5
Statements & assessments 4
Plans & drawings 19
PDF
LOCATION PLAN
Location Plan · 28 May 2026
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PDF
23022-DR-002 - EXISTING SITE PLAN - REV 2
Drawing · 28 May 2026
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PDF
23022-DR-010 - PROPOSED SITE PLAN - REV 2
Drawing · 28 May 2026
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PDF
23022-DR-050 - PROPOSED VISUALS SOUTH ELEVATION - REV 2
Drawing · 28 May 2026
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PDF
23022-DR-051 - PROPOSED VISUALS EAST ELEVATION - REV 2
Drawing · 28 May 2026
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PDF
23022-DR-052 - PROPOSED VISUALS WEST PASSAGEWAY - REV 2
Drawing · 28 May 2026
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PDF
23022-DR-053 - PROPOSED ACOUSTIC BARRIER MATERIALITY - REV 2
Drawing · 28 May 2026
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PDF
23022-DT-040 - EXISTING AND PROPOSED DETAILS 1 OF 2 - REV 2
Drawing · 28 May 2026
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PDF
23022-DT-041 - EXISTING AND PROPOSED DETAILS 2 OF 2 - REV 2
Drawing · 28 May 2026
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PDF
23022-DT-060 - SUBSTATION PROPOSAL 1 OF 2 - REV 10
Drawing · 28 May 2026
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PDF
23022-DT-061 - SUBSTATION PROPOSAL 2 OF 2 - REV 10
Drawing · 28 May 2026
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PDF
23022-DT-062 - SUBSTATION EXISTING AND DEMOLITION - REV 1
Drawing · 28 May 2026
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PDF
23022-GA-011 - EXISTING AND PROPOSED ROOF PLAN - REV 3
Drawing · 28 May 2026
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PDF
23022-GA-020 - EXISTING AND PROPOSED ELEVATIONS 1 OF 4 - REV 3
Drawing · 28 May 2026
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PDF
23022-GA-021 - EXISTING AND PROPOSED ELEVATIONS 2 OF 4 - REV 2
Drawing · 28 May 2026
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PDF
23022-GA-022 - EXISTING AND PROPOSED ELEVATIONS 3 OF 4 - REV 2
Drawing · 28 May 2026
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PDF
23022-GA-023 - EXISTING AND PROPOSED ELEVATIONS 4 OF 4 - REV 3
Drawing · 28 May 2026
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PDF
23022-GA-024 - EXISTING AND PROPOSED SECTIONAL ELEVATIONS 1 OF 2 - REV 2
Drawing · 28 May 2026
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PDF
23022-GA-025 - EXISTING AND PROPOSED SECTIONAL ELEVATIONS 2 OF 2 - REV 2
Drawing · 28 May 2026
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Application forms 1
Consultation & comments 4
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Important details
- Council
- Westminster
- Application type
- Listed Building Consent Application
- Postcode
- W1G 0RN
- Received
- 28 May 2026
- Validated
- 28 May 2026
- Ward
- West End
- Case officer
- Show
- Target decision
- 23 Jul 2026
- Decision
- Application Permitted
- Decision date
- 8 Jul 2026
- Decision level
- Delegated Decision
- Agent
- Rolfe Judd Planning
Consultation & key dates
- Alt. reference
- PP-14949961
- Press notice
- 17 Jun 2026
- Env. assessment
- No
Historical activity at this location
34 previous applications on record - archival context, not part of the live application.
This property
Previous applications at this address
2022
Approved
Erection of a dummy mansard roof extension, replacement roof top plant within an acoustic…
2022
Approved
Erection of a dummy mansard roof extension, replacement roof top plant within an acoustic…
2021
Approved
Refurbish, make good or replace elements of the courtyard roof and historic coverings.
2018
Refused
Installation of two air handling units at rear ground floor level, two air handling units…
2018
Refused
Installation of two air handling units at rear ground floor level, two air handling units…
2017
Approved
Installation of new fixings to existing shutters and associated repair works.
2017
Approved
Display of four non-illuminated banners measuring 1.250m x 1.850m on scaffolding at groun…
2017
Refused
Introduction of new lead work to the top of all protruding stonework, namely window and d…
2017
Approved
Cleaning and removal of white paint from the brickwork of the internal rear courtyard ele…
Within ~100m
Nearby activity
2025
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of internally illuminated temporary external Christmas lights measuring 12.5m (h)…
2025
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of internally illuminated temporary light curtain measuring 12.5m (h) X 72m (w)
2025
Cavendish House 18 Cavendish Square London W1G 0PJ
Removal of double doorway with surrounding frame and glazing, provision of matwell, refur…
2025
Approved
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of non illuminated canopy letters measuring 3.2m X 3m, for a temporary period.
2025
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of non illuminated temporary inflatable measuring 4.6m X 12.1m on the Oxford Stre…
2025
Cavendish Square London
Display of non illuminated egg sculpture and plinth measuring 0.5m X 1.6m for a temporary…
2024
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of internally illuminated inflatable snowballs located on the Oxford Street eleva…
2024
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of internally illuminated LED light curtain measuring 12.5m x 72m for a temporary…
2024
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of an illuminated LED curtain measuring 12.5m x 72m for a temporary period from 9…
2024
Approved
John Lewis 278 - 306 Oxford Street London W1C 1DX
Display of 3 no. non-illuminated inflatable objects on the eastern third of the Oxford St…
2024
Open Space In Centre Cavendish Square London W1G 9DB
Temporary display of signages at Cavendish Square in association with the Underbelly Fest…
2024
Open Space In Centre Cavendish Square London W1G 9DB
Installation of a Spiegeltent touring structure (with an internal capacity of up to 400)…
2024
Approved
318 Oxford Street London W1C 1HF
Temporary display of replica facade building wrap to the south elevation incorporating ex…
2023
Approved
John Lewis 278-306 Oxford Street London W1C 1DX
Display of inflatable Christmas decoration measuring 15m x 10m for a temporary period fro…
2023
Approved
John Lewis 278-306 Oxford Street London W1C 1DX
Display of illuminated temporary external Christmas lights measuring 12.5m x 72m
2023
Refused
318 Oxford Street London W1C 1HF
Display of replica façade building wrap to the south elevation incorporating non-illumina…
2022
Approved
John Lewis 278-306 Oxford Street London W1C 1DX
Display of temporary LED lighting curtain that spans the whole of the Oxford Street eleva…
2022
Refused
318 Oxford Street London W1C 1HF
Display of non-illuminated 22m x 10m sign on a building wrap affixed to the scaffolding f…
2022
Approved
Apartment 21 Harcourt House 19 Cavendish Square London W1G 0PL
Internal works.
2022
Approved
Basement Floor And Ground Floor 19 Wigmore Street London W1U 1PH
Use of basement and ground floors as retail operation with ancillary sales office [Class…
2018
Approved
20-21 Cavendish Square London W1G 0RN
Installation of a replacement plant room and additional plant items at main roof level.
2018
Refused
318 Oxford Street London W1A 1DE
Display of two internally illuminated digital LED screens, one on each side of a freestan…
2018
Refused
318 Oxford Street London W1A 1DE
Removal of existing BT payphone kiosks and the erection of a freestanding ('InLink') stru…
2018
Approved
Harcourt House 19 Cavendish Square London W1G 0PL
Fireplace refurbishment and restoration strategy.
2018
Approved
Harcourt House 19 Cavendish Square London W1G 0PL
Display of three non-illuminated hoarding signs measuring 5.4m x 50m, 5.3m x 5.1m and 4.8…
Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Other 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 performance
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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20 - 21 Cavendish Square London W1G 0RN
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