Planning application
23 Grafton Street London W1S 4EY
Works: Extension Loft or dormer Demolition Windows or glazing
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Amendments to planning permission dated 17 June 2025 (RN: 25/01604/FULL) for Phased development including replacement of rear basement roof slab and creation of a rear extension at ground floor. Removal of rear ground floor toilet block and external fire escape stairs. Demolition of existing, altered mansard roof and construction of a new mansard roof with dormer windows and concealed plant enclosure. Extension of existing lift to serve fourth floor. Replacement of third floor rear windows with double glazed sash windows. Minor internal reconfigurations. Continued use of ground floor as retail (Use Class E(a)) and basement, first, second, third and fourth as office (Use Class E(g)). NAMELY, to retain ground floor rear door, retain existing floor slab and rear void, retain ground-floor landing stairs in existing arrangement, and amendment of Condition 11 to require details of waste and recycling to be submitted for approval prior to occupation.
As published by the council, reference 26/00555/NMA
Application record
- Reference
- 26/00555/NMA
- Type
- Non-material amendments
- Status
- Decided
- Decision
- Granted As published: Application Permitted
- Received
- 30 Jan 2026
- Validated
- 30 Jan 2026
- Decided
- 21 Apr 2026
- Ward
- West End
- Decision by
- Delegated Decision
- Postcode
- W1S 4EY
Site history
Applications at this address on the Westminster register
This site has had 10 applications since 2025: 3 approved, 0 refused.
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26/07376/ADFULL Awaiting decision
23 Grafton Street London W1S 4EY
Sample of the York stone to be used for the new front steps to ground floor level; pursuant to condition 7 of planning permission dated 13th October 2026 (26/00554/LBC)
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26/06193/ADFULL Decided
23 Grafton Street London W1S 4EY
Details of all new windows and doors; pursuant to condition 10(B) of planning permission dated 17th June 2026 (25/01604/FULL)
-
26/01670/ADFULL Awaiting decision
23 Grafton Street London W1S 4EY
Detailed drawings of the alterations to party walls and buttress pursuant to part conditions 10a of planning permission dated 17th June 2025 (RN 25/01604/FULL)
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26/01669/ADLBC Awaiting decision
23 Grafton Street London W1S 4EY
Detailed drawings of All new windows and doors pursuant to part conditions 4b of listed building consent dated 17th June 2025 (RN 25/01605/LBC)
-
26/01033/ADFULL Granted
23 Grafton Street London W1S 4EY
Detailed drawings, including sections (scale 1:20 and 1:5) of new rooflight pursuant to Condition 10 (B) (part) of planning permission dated 17th June 2025 (RN: 25/01604/FULL)
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26/01025/ADLBC Granted
23 Grafton Street London W1S 4EY
Detailed drawings, including sections of rooflight to mansard roof pursuant to Condition 4 (B) (part) of listed building dated 17th June 2025 (RN: 25/01605/LBC)
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26/00782/FULL Awaiting decision
23 Grafton Street London W1S 4EY
Variation of Conditions 7 and 8 of planning permission dated 17 June 2025 (RN: 25/01604/FULL) for 'Phased development including replacement of rear basement roof slab and creation of a rear extension at ground floor. Removal of rear ground floor toilet block and external fire escape stairs. Demolition of existing, altered mansard roof and construction of a new mansard roof with dormer windows and concealed plant enclosure. Extension of existing lift to serve fourth floor. Replacement of third floor rear windows with double glazed sash windows. Minor internal reconfigurations. Continued use of ground floor as retail (Use Class E(a)) and basement, first, second, third and fourth as office (Use Class E(g))'. NAMELY, to enable the use the lower ground to fourth floor levels for either Class E(a) retail and/or Class E(g) office use.
-
26/00554/LBC Decided
23 Grafton Street London W1S 4EY
Phased development including retention of rear basement roof slab (previously proposed for demolition and replacement), infilling of void creating an internal lightwell and the creation of a rear extension at ground floor. Removal of rear ground floor toilet block and external fire escape stairs. Demolition of existing, altered mansard roof and construction of a new mansard roof with dormer windows and concealed plant enclosure. Extension of existing lift to serve fourth floor. Replacement of third floor rear windows with double glazed sash windows. Minor internal reconfigurations.
-
25/09056/ADFULL Awaiting decision
23 Grafton Street London W1S 4EY
Details of waste storage pursuant to condition 11 of planning permission dated 17 June 2025 (RN: 25/01604/FULL)
Timeline
Dates from the published record
-
30 Jan 2026
Received by Westminster
-
21 Apr 2026
Decision issued: Application Permitted
-
21 Jul 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
Montagu Evans LLP Agent, registered in London
Active · incorporated 2005 · London
1,342 applications on PlanIndex · across 131 councils · 97% granted
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
18 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.
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Open the documentsWhat this grant of permission means
Westminster granted permission on 21 April 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About amendment applications
An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
23 Grafton Street London W1S 4EY
88% historically approved · decision due ~8 May
Detailed drawings of the alterations to party walls and buttress pursuant to part conditions 10a of planning permission dated 17th June 2025 (RN 25/01604/FULL)
Awaiting decision Full applications 12 docs -
23 Grafton Street London W1S 4EY
89% historically approved · decision due ~8 May
Detailed drawings of All new windows and doors pursuant to part conditions 4b of listed building consent dated 17th June 2025 (RN 25/01605/LBC)
Awaiting decision Conditions Windows or glazing 13 docs -
23 Grafton Street London W1S 4EY
88% historically approved · decision due ~9 Feb
Details of waste storage pursuant to condition 11 of planning permission dated 17 June 2025 (RN: 25/01604/FULL)
Awaiting decision Full applications 5 docs -
23 Grafton Street London W1S 4EY
Phased development including retention of rear basement roof slab (previously proposed for demolition and replacement), infilling of void creating an internal lightwell and the creation of a rear extension at ground floor. Removal of rear ground floor toilet block and external fire escape stairs. Demolition of existing, altered mansard roof and construction of a new mansard roof with dormer windows and concealed plant enclosure. Extension of existing lift to serve fourth floor. Replacement of third floor rear windows with double glazed sash windows. Minor internal reconfigurations.
Decided Heritage and listed buildings Extension Loft or dormer +2 47 docs -
23 Grafton Street London W1S 4EY
88% historically approved · decision due ~7 Apr
Variation of Conditions 7 and 8 of planning permission dated 17 June 2025 (RN: 25/01604/FULL) for 'Phased development including replacement of rear basement roof slab and creation of a rear extension at ground floor. Removal of rear ground floor toilet block and external fire escape stairs. Demolition of existing, altered mansard roof and construction of a new mansard roof with dormer windows and concealed plant enclosure. Extension of existing lift to serve fourth floor. Replacement of third floor rear windows with double glazed sash windows. Minor internal reconfigurations. Continued use of ground floor as retail (Use Class E(a)) and basement, first, second, third and fourth as office (Use Class E(g))'. NAMELY, to enable the use the lower ground to fourth floor levels for either Class E(a) retail and/or Class E(g) office use.
Awaiting decision Full applications Extension Loft or dormer +2 13 docs -
23 Grafton Street London W1S 4EY
89% historically approved · decision due ~23 Dec
Sample of the York stone to be used for the new front steps to ground floor level; pursuant to condition 7 of planning permission dated 13th October 2026 (26/00554/LBC)
Awaiting decision
Other amendment applications
In Westminster
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26/07389/NMA Decided
Flat 1 5 Grittleton Road London W9 2DD
Amendments to planning permission dated 04 June 2025 (RN: 25/02022/FULL), NAMELY, amendment of Condition 4 to correct the property address from 9 Aldridge Road Villas to Flat 1 5 Grittleton Road.
-
26/07377/NMA Awaiting decision
60 Ledbury Road London W11 2AJ
Amendments to planning permission dated 2nd October 2025 (RN 25/04018/FULL) for the Partial demolition, refurbishment, and erection of a mansard roof extension to form a new third floor with dormers to front, side and rear elevations; to form 6 flats (Class C3) on upper floors; external plant equipment and ductwork; lower ground floor excavation to increase floor to ceiling height; replacement windows; cycle parking and associated external alterations; use of the part ground floor and lower ground floor as retail and restaurant (Class E). Site includes 60-68 Ledbury Road) NAMELY, An amendment to the basement and ground floor drawing reference numbers; amendment to the description of development, in reference to restaurant and or retail use; and amendments to C
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26/07375/NMA Awaiting decision
77 Hereford Road London W2 5BB
Amendments to planning permission dated 4th August 2026 (RN 26/03970/FULL) for the Replacement of roof terrace access stair with glazed hatch, new timber decking and front and rear roof railings to roof terrace, with infilling side window of closet wing. NAMELY, Hinged hatch access substituted by sliding hatch.
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26/07312/NMA Awaiting decision
15 Rodmarton Street London W1U 8BL
Amendment to planning permission dated 5 May 2026 (26/00539/FULL) for: Erection of a single storey conservatory at rear ground floor level, use of the garage as internal living accommodation and installation of a new skylight at main roof level namely, to allow a reduction in the size of the rear orangery and alterations to its roof arrangement.
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26/07317/NMA Awaiting decision
42 - 44 Beak Street London W1F 9RH
Amendments to planning permission dated 28 October 2025 (25/06226/FULL) for: Installation of a replacement entrance door and the formation of an additional new entrance at ground floor level; associated alterations to the ground floor facade and the installation of plant and related mechanical equipment at roof level namely, paint colour and lighting.