Orbis House 5 Mansfield Street London W1G 9NG Data via plota.co.uk

26/04873/NMA - Non-material amendments Approved
Extensions & alterationsSolar & renewables

Proposal

Amendments to planning permission dated 05 September 2024 (RN: ) for: new courtyard surface including walk-on rooflight; window and door alterations; new window to Mansfield Mews at second floor level; new rooflights; repairs to roof and external brickwork; erection of new staircase in front area lightwell; partial infill of rear lightwell at ground floor level; erection of roof terrace; installation of PV panels at roof level; and associated works namely; to allow provision of guarding system to provide safe access for maintenance across the roof; alteration at south elevation omitting window SFW11 from the new WC, remove the existing RWP from the internal courtyard corner, removal of the existing plastic section of a redundant vent pipe at lower level and retain original lead; new cast iron rain water pipes at west elevation; and internal layout alterations at basement, ground, 2nd, 3rd floors. (Linked with 26/04876/LBC) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
21 Jul 2026
✓
Approved
12 Aug 2026

Approved on 12 Aug 2026 · Delegated Decision · Last checked 12 Aug 2026

Documents 17

Decision & officer reports 2

PDF GRANT NON MATERIAL AMENDMENT Decision Notice · 12 Aug 2026 View ↗ PDF DELEGATED REPORT Report · 12 Aug 2026 View ↗

Plans & drawings 10

PDF 2681_30-12_P1 - BASEMENT PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-13_P1 - GROUND FLOOR PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-14_P1 - FIRST FLOOR PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-15_P1 - SECOND FLOOR PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-16_P1 - THIRD FLOOR PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-17_P1 - ROOF PLAN Drawing · 21 Jul 2026 View ↗ PDF 2681_30-18_P1 - SOUTH ELEVATION Drawing · 21 Jul 2026 View ↗ PDF 2681_30-19_P1 - SOUTH COURTYARD ELEVATION Drawing · 21 Jul 2026 View ↗ PDF 2681_SK-4 ROOF GUARDING Drawing · 21 Jul 2026 View ↗ PDF 268_30-21_P1 - WEST ELEVATION Drawing · 21 Jul 2026 View ↗

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 21 Jul 2026 View ↗

Other documents 4

PDF ACK - NON-MATERIAL AMENDMENT Background Papers · 27 Jul 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 22 Jul 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 22 Jul 2026 View ↗ PDF AMENDMENT NOTES - JULY 2026 Background Papers · 21 Jul 2026 View ↗

All documents on the council site ↗

Associated applications 4

Site constraints 9

Grade II* listed: 5-13, Mansfield Street W1
List entry 1273679 · The pin is inside its outline · 64 more listed buildings within 150 m (1 Grade I, 11 Grade II*, 51 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 64 with distances
Historic England ↗
Harley Street 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 2.5
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 ↗
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
National infrastructure project 1792 m away: Thames Tideway Tunnel; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 2 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.

Building

Floor area897 m² (9,655 sq ft)
Energy ratingE (asset rating 116)
UseOffices and Workshop Businesses
HeatingHeating and Mechanical Ventilation

From the energy performance certificate lodged in March 2023, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Westminster
Application type
Non-material amendments
Postcode
W1G 9NG
Received
21 Jul 2026
Validated
21 Jul 2026
Ward
Marylebone
Case officer
Show
Target decision
18 Aug 2026
Decision
Application Permitted
Decision date
12 Aug 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Johnston Cave Associates

How this decision compares

Decided in 22 days from validation, 33 days faster than Westminster's median of 55 for extensions. Approved, as 88% of extensions here are.

56%decided within 8 weeks
88%approved
1,937decided 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.

Last counted 12 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15096189
Planning Portal ref
PP-15096189
Env. assessment
No

Historical activity at this location

33 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2025
Confirmation that the material change of use from office to use as a single family dwelli…
25/08080/CLEUD
2025 Approved
Amendments to planning permission dated 12th March 2013 (RN 12/09926/FULL) for the Extern…
25/04096/NMA
2025
Detailed specifications, and drawings at 1:10 with full size details, of fire upgrade wor…
25/03617/ADLBC
2025 Approved
Detailed specifications, and drawings at 1:10 with full size details, of refurbishment wo…
25/02086/ADLBC
2025
Details of maquettes of the new decorative plasterwork for the main stairwell pursuant to…
25/01255/ADLBC
2024
Reinstatement of demolished historic stone cantilevered staircase; new courtyard floor; w…
24/01896/LBC
2024
Reinstatement of demolished historic stone cantilevered staircase; new courtyard floor; w…
24/01895/FULL
2016 Approved
Confirmation that the proposed commencement works would constitute a material operation t…
16/04189/CLOPUD
Within ~100m

Nearby activity

2025
4 Queen Anne Street London W1G 9LQ
Repositioning of the plant units and new anti-vibration mounts. (Linked with 25/07282/FUL…
25/07252/LBC
2025
4 Queen Anne Street London W1G 9LQ
Variation of condition 1 of planning permission dated 22nd November 2024 (RN: 24/05074/FU…
25/07255/FULL
2025
4 Queen Anne Street London W1G 9LQ
Installation of additional anti-vibration mounts and reposition the currently approved pl…
25/07251/LBC
2025 Withdrawn
4 Mansfield Mews London W1G 9NL
Partial removal of existing roof to create new roof terrace, accessible via a new stair w…
25/05099/FULL
2025 Withdrawn
4 Mansfield Mews London W1G 9NL
Partial removal of existing roof to create new roof terrace, accessible via a new stair w…
25/05100/LBC
2025
2 Mansfield Mews London W1G 9NL
Replacement of existing glass roof finish with a zinc covering.
25/06964/FULL
2025
43 - 49 Harley Street London W1G 8BT
Installation of support beam to facilitate failing beam at ground floor level (45 Harley…
25/06693/LBC
2025
9 Mansfield Street London W1G 9NZ
Change of Use from office (Class E) to residential (Use Class C3), refurbishment and reco…
25/06412/FULL
2025
9 Mansfield Street London W1G 9NZ
Change of Use from office (Class E) to residential (Use Class C3), refurbishment and reco…
25/06413/LBC
2025 Approved
Flat 53 2 Mansfield Street London W1G 9NF
Alterations to the internal layout including the removal of partitions, construction of n…
25/04293/LBC
2025 Approved
43 - 49 Harley Street London W1G 8BT
Repositioning of four air conditioning condenser units in the inner light-well and at the…
25/01884/FULL
2025
10 Duchess Street London W1G 9AB
Internal alterations (in connection with the change of use approved under 24/02735/FULL a…
25/03265/LBC
2025
15 Mansfield Street London W1G 9NH
Installation of a dumbwaiter from basement to first-floor level.
25/02948/LBC
2025
57 Harley Street London W1G 8QS
Relocation of the residential (Class C3) space from the part ground and basement floors t…
25/02646/FULL
2025
15 Mansfield Street London W1G 9NH
Internal fit-out works.
25/00664/LBC
2025
17 Duchess Mews London W1G 9DU
Installation of ten PV panels and replacement of air conditioning unit with air source he…
25/00325/LBC
2024
9 Mansfield Street London W1G 9NZ
Limited demolition, strip out and investigative works to 9 Mansfield Street and 6 Mansfie…
24/09052/LBC
2024
17 Duchess Mews London W1G 9DU
Variation of conditions 1,4, 5 of planning permission dated 6th August 2024 (RN 24/00210/…
24/08568/FULL
2024
17 Duchess Mews London W1G 9DU
Variation of conditions 1,4, 5 of listed building consent dated 6th August 2024 (RN 24/00…
24/08732/LBC
2024
Flat 34 2 Mansfield Street London W1G 9NF
Mounting of air source heat pump at roof level and associated cabling and connection via…
24/07905/LBC
2021 Withdrawn
Flat 36 Harmont House 20 Harley Street London W1G 9PJ
Use of flat at fourth and fifth floors as a mixed residential and private dental practice…
21/00013/FULL
2021 Approved
2 Mansfield Street London W1G 9NZ
External repair and redecoration works and installation of waterproof roof lining.
21/00703/LBC
2021 Approved
2 Mansfield Street London W1G 9NZ
External repair and redecoration works and installation of waterproof roof lining.
21/00702/FULL
2020 Approved
2 Mansfield Street London W1G 9NF
Installation of extract grilles and boiler flue in the light wells and installation of a…
20/08293/FULL
2020 Approved
Flat 34 2 Mansfield Street London W1G 9NF
Variation of condition 1 of listed building consent dated 21 February 2019 (RN: 18/08430/…
21/00030/LBC
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
Source: MHCLG planning statistics · See full council rankings

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.