Planning application
14 Cavendish Square London W1G 9DB
Works: Loft or dormer
Relates to 25/07887/LBC
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Detailed drawings of the sliding roof lights above stair leading to roof terrace showing adjoining fabric and key details and detailed study and drawings of the roof light over the stair and its relationship to the existing decorative plasterwork pursuant to condition 3 (5) and (8) of listed building dated 11th March 2026 (RN:25/07887/LBC)
As published by the council, reference 26/04714/ADLBC
Application record
- Reference
- 26/04714/ADLBC
- Type
- Approval of Details (ADLBC)
- Status
- Pending
- Received
- 14 Jul 2026
- Validated
- 20 Jul 2026
- Ward
- Marylebone
- Postcode
- W1G 9DB
Site history
Applications at this address on the Westminster register
This site has had 7 applications since 2025: 2 approved, 0 refused.
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26/05855/ADLBC Decided
14 Cavendish Square London W1G 9DB
Details of doors (external) showing adjoining fabric and key details, windows showing adjoining fabric and key details, sliding roof lights above stair leading to roof terrace showing adjoining fabric and key details, works to the vaults, including any tanking and all sides of roof access leading to roof top terrace to be solid not glazed pursuant to conditions 3 (Part 1,2,3 and 6) and Condition 9 of Listed Building Consent dated 11th March 2026 (RN: 25/07887/LBC).
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26/05840/ADFULL Awaiting decision
14 Cavendish Square London W1G 9DB
Details of photographs and specification of facing materials; external doors, windows, sliding roof lights, and railings; and all sides of roof access pursuant to conditions 21, 25 and 26 of planning permission dated 11 March 2026 (RN: 25/07886/FULL). (Linked with 26/05855/ADLBC)
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26/05842/ADLBC Awaiting decision
14 Cavendish Square London W1G 9DB
Details of railings showing adjoining fabric and key details, including detailed drawings with historic building commentary of proposals, including decorative schemes to the rooms behind the front facade, hall, principal stair and stair volume and front external light well. This should include fireplaces, decorative joinery, decorative plaster work and floorboards; pursuant to condition 3(part4,7) of Listed Building consent dated 11th March 2026 (25/07887/LBC)
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25/07887/LBC Granted
14 Cavendish Square London W1G 9DB
Alterations including; demolition and alteration to roof structure including the installation of mechanical plant to roof valley above and the provision of a new terrace and associates railing and access arrangement (sliding roof light) to the rear of the main roof, removal of fixed rooflight over central stair; removal of stair from third floor terrace to plant zone at main roof level; installation of replacement roof lights at main roof level; refurbishment of main entrance door, installation of replacement security camera system, alteration to the ground and lower ground floor fenestration facing Deans Mews and facing internal lightwell, installation of replacement windows and doors at rear ground fand first floor level facing Deans Mews elevation and within the internal lightwell, removal of render to lightwell, installation of replacement cover and railings to first floor terrace, installation of onsite greening. Internal alteration and refurbishment throughout.
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25/07886/FULL Awaiting decision
14 Cavendish Square London W1G 9DB
Refurbishment of 14 Cavendish Square, including modest internal and external alterations, and amendments to use comprising the re-location of a residential unit (Class C3) and increased museum floorspace (Class F1). (Linked to 25/07887/LBC)
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25/05407/ADFULL Granted
14 Cavendish Square London W1G 9DB
Details of an Operational Management Plan pursuant to Condition 3 of planning permission dated 9th April 2025 (RN: 25/00722/FULL)
Timeline
Dates from the published record
-
14 Jul 2026
Received by Westminster
-
20 Jul 2026
Validated
Checked as complete and ready for consideration.
-
25 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 14 September 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Westminster took a median of 66 days over the applications it decided in the last year.
Related applications
Cases linked to this one on the register
-
25/07887/LBC Granted
14 Cavendish Square London W1G 9DB
Alterations including; demolition and alteration to roof structure including the installation of mechanical plant to roof valley above and the provision of a new terrace and associates railing and access arrangement (sliding roof light) to the rear of the main roof, removal of fixed rooflight over central stair; removal of stair from third floor terrace to plant zone at main roof level; installation of replacement roof lights at main roof level; refurbishment of main entrance door, installation of replacement security camera system, alteration to the ground and lower ground floor fenestration facing Deans Mews and facing internal lightwell, installation of replacement windows and doors at rear ground fand first floor level facing Deans Mews elevation and within the internal lightwell, removal of render to lightwell, installation of replacement cover and railings to first floor terrace, installation of onsite greening. Internal alteration and refurbishment throughout.
Who's behind it
Company information only, from the register and Companies House
Sanchez Benton Architects Ltd Agent, an architecture practice registered in Ilford
Active · incorporated 2016 · Ilford
11 applications on PlanIndex · across 3 councils
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
27 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Watch members (£5 a month) open the document list from here.
Open the documentsWhat happens while it is decided
This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided condition discharge and variation applications in a median of 42 days. More in our guide to how long planning decisions take.
About condition discharge and variation applications
This application deals with conditions on an existing permission, supplying the details a condition requires or asking to vary or remove one, without reopening the permission itself. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
14 Cavendish Square London W1G 9DB
Details of an Operational Management Plan pursuant to Condition 3 of planning permission dated 9th April 2025 (RN: 25/00722/FULL)
Granted Full applications 11 docs -
14 Cavendish Square London W1G 9DB
89% historically approved · decision due ~21 Oct
Details of doors (external) showing adjoining fabric and key details, windows showing adjoining fabric and key details, sliding roof lights above stair leading to roof terrace showing adjoining fabric and key details, works to the vaults, including any tanking and all sides of roof access leading to roof top terrace to be solid not glazed pursuant to conditions 3 (Part 1,2,3 and 6) and Condition 9 of Listed Building Consent dated 11th March 2026 (RN: 25/07887/LBC).
Decided Loft or dormer Windows or glazing -
14 Cavendish Square London W1G 9DB
89% historically approved · decision due ~20 Oct
Details of photographs and specification of facing materials; external doors, windows, sliding roof lights, and railings; and all sides of roof access pursuant to conditions 21, 25 and 26 of planning permission dated 11 March 2026 (RN: 25/07886/FULL). (Linked with 26/05855/ADLBC)
Awaiting decision Loft or dormer Windows or glazing -
14 Cavendish Square London W1G 9DB
89% historically approved · decision due ~20 Oct
Details of railings showing adjoining fabric and key details, including detailed drawings with historic building commentary of proposals, including decorative schemes to the rooms behind the front facade, hall, principal stair and stair volume and front external light well. This should include fireplaces, decorative joinery, decorative plaster work and floorboards; pursuant to condition 3(part4,7) of Listed Building consent dated 11th March 2026 (25/07887/LBC)
Awaiting decision -
14 Cavendish Square London W1G 9DB
87% historically approved · decision due ~25 Dec
Refurbishment of 14 Cavendish Square, including modest internal and external alterations, and amendments to use comprising the re-location of a residential unit (Class C3) and increased museum floorspace (Class F1). (Linked to 25/07887/LBC)
Awaiting decision Full applications 141 docs -
14 Cavendish Square London W1G 9DB
Alterations including; demolition and alteration to roof structure including the installation of mechanical plant to roof valley above and the provision of a new terrace and associates railing and access arrangement (sliding roof light) to the rear of the main roof, removal of fixed rooflight over central stair; removal of stair from third floor terrace to plant zone at main roof level; installation of replacement roof lights at main roof level; refurbishment of main entrance door, installation of replacement security camera system, alteration to the ground and lower ground floor fenestration facing Deans Mews and facing internal lightwell, installation of replacement windows and doors at rear ground fand first floor level facing Deans Mews elevation and within the internal lightwell, removal of render to lightwell, installation of replacement cover and railings to first floor terrace, installation of onsite greening. Internal alteration and refurbishment throughout.
Granted Heritage and listed buildings Loft or dormer Roofing +2 150 docs
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