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

26/00954/ADFULL - Approval of Details (Full PP) Approved
Admin / procedural

Proposal

Detailed specifications, and drawings at 1:10 with full size details, of refurbishment works to the windows, and of detailed drawings at 1: 10 with full size sections through the glazing bars of the new sash windows and French windows pursuant to condition 6 of planning permission dated 5th September 2024 (RN:) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
16 Feb 2026
✓
Validated
16 Mar 2026
✓
Approved
15 Apr 2026

Approved on 15 Apr 2026 · Delegated Decision · Last checked 24 Sept 2026

Documents 41

Decision & officer reports 2

PDF APPR. OF DETAILS-FULL RESMAT [PE] Decision Notice · 16 Apr 2026 View ↗ PDF DELEGATED REPORT Report · 16 Apr 2026 View ↗

Plans & drawings 19

PDF BASEMENT ENCLOSED LIGHTWELL WINDOW AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF WEST ELEVATION WINDOW AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF NEW SASH WINDOW SFW10 ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF NEW WINDOWS SF04 SF05 ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF NEW SASH WINDOW FFW10 ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF NEW SASH WINDOW FFW08 ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF BASEMENT BW07 HIGH LEVEL WINDOW REPLACEMENT DETAILS Drawing · 16 Mar 2026 View ↗ PDF BASEMENT BW04 WINDOW ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF PROPOSED WINDOWS BW01 02 03 AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF TYPICAL LANCET WINDOW ALTERATION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF TYPICAL NEW WINDOW SHUTTER CONSTRUCTION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF TYPICAL NEW 10MM WINDOW CONSTRUCTION DETAILS Drawing · 16 Mar 2026 View ↗ PDF TYPICAL NEW 4MM WINDOW CONSTRUCTION DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF TYPICAL EXISTING SASH WINDOW REPAIR DETAILS AS PROPOSED Drawing · 16 Mar 2026 View ↗ PDF NORTH ELEVATION WINDOW PROPOSALS Drawing · 16 Mar 2026 View ↗ PDF SOUTH ELEVATION WINDOW PROPOSALS Drawing · 16 Mar 2026 View ↗ PDF DOC(0)-360 SOUTH ELEVATION WINDOW PROPOSALS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-361 NORTH ELEVATION WINDOW PROPOSALS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-362 WEST ELEVATION WINDOW PROPOSALS Superseded document · 16 Feb 2026 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 16 Feb 2026 View ↗ PDF FEECALCULATION Background Papers · 16 Feb 2026 View ↗

Other documents 18

PDF ACK-APPROVAL OF DETAILS APPL. Background Papers · 14 Apr 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 13 Mar 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 13 Mar 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 16 Feb 2026 View ↗ PDF DOC(0)-363 BASEMENT ENCLOSED LIGHTWELL WINDOW PROPOSALS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-365 TYPICAL EXISTING SASH WINDOW REPAIR DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-366A TYPICAL NEW 4MM WINDOW CONSTRUCTION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-366B TYPICAL NEW 10MM WINDOW CONSTRUCTION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-367 TYPICAL NEW WINDOW SHUTTER CONSTRUCTION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-368 TYPICAL LANCET WINDOW ALTERATION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-370 PROPOSED WINDOWS BW01 02 03 Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-371 BASEMENT BW04 WINDOW ALTERATIONS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-372 BASEMENT BW07 HIGH LEVEL WINDOW REPLACEMENT DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-382 NEW SASH WINDOW FFW08 ALTERATION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-383 NEW SASH WINDOW FFW10 ALTERATION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-384 NEW WINDOWS SF04 SF05 ALTERATION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF DOC(0)-385 NEW SASH WINDOW SFW10 ALTERATION DETAILS Superseded document · 16 Feb 2026 View ↗ PDF WINDOW DISCHARGE OF CONDITIONS COVER SHEET Other · 16 Feb 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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Other new applications on this street

20 Aug 2026Pending

2 Mansfield Street London W1G 9NZ

Installation of full fibre cables on and through the building.

26/05715/LBC
27 Jul 2026Approved

Flat 41 2 Mansfield Street London W1G 9NF

Installation of external AC condenser at main roof level, associated connection ...

26/05036/LBC
3 Jun 2026Approved

Flat 49 2 Mansfield Street London W1G 9NF

Replacement of seven windows.

26/01207/LBC

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26/07334/ADV
2 Nov 2026Pending

57 Harley Street London W1G 8QS

Details of facing materials, biodiverse green roof details and management, and L...

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Replacement of existing timber sash windows with slim double glazed timber sash ...

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Important details

Council
Westminster
Application type
Approval of Details (Full PP)
Postcode
W1G 9NG
Received
16 Feb 2026
Validated
16 Mar 2026
Ward
Marylebone
Case officer
Show
Target decision
11 May 2026
Decision
Application Permitted
Decision date
15 Apr 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Johnston Cave Associates

Public comments

No public comments yet.

Last counted 24 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14708778
Planning Portal ref
PP-14708778
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.