Planning application
1 - 3 Belgrave Mews South London SW1X 8BT
Works: Extension Loft or dormer Demolition Windows or glazing Small domestic
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Proposal
Amendments to planning permission dated 27 August 2024 (RN:24/03215/FULL) for demolition behind retained front facade and construction of replacement house including replacement rear extension and terrace at lower height with new shallow balcony at second floor level; replacement of the fenestration and the roof of the existing mansard to include inset PV panels and an enclosed plant deck; and reposition front door with shallower porch. namely, amendment to front door and garage door to the front elevation at ground floor level.
As published by the council, reference 26/00644/NMA
Application record
- Reference
- 26/00644/NMA
- Type
- Non-material amendments
- Status
- Pending
- Received
- 4 Feb 2026
- Validated
- 4 Feb 2026
- Ward
- Knightsbridge & Belgravia
- Postcode
- SW1X 8BT
Site history
Applications at this address on the Westminster register
This site has had 2 applications since 2025: 1 approved, 0 refused.
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25/07399/NMA Granted
1 - 3 Belgrave Mews South London SW1X 8BT
Amendments to planning permission dated 27th August 2024 (RN:24/03215/FULL) for: Demolition behind retained front facade and construction of replacement house including replacement rear extension and terrace at lower height with new shallow balcony at second floor level; replacement of the fenestration and the roof of the existing mansard to include inset PV panels and an enclosed plant deck; and reposition front door with shallower porch. NAMELY, to allow amendments to ground floor rear fenestration.
Timeline
Dates from the published record
-
4 Feb 2026
Received by Westminster
-
21 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 1 April 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 91 days over the applications it decided in the last year.
Who's behind it
Company information only, from the register and Companies House
Firstplan Ltd Agent, registered in London
Active · incorporated 2003 · London
844 applications on PlanIndex · across 119 councils · 94% granted
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See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
2 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 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 amendment applications in a median of 81 days. More in our guide to how long planning decisions take.
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
-
34 Belgrave Mews South London SW1X 8BT
Details of a validation report pursuant to condition 5 (Phase 4) of planning permission dated 8th February 2024 (RN:23/08449/FULL).
Granted Full applications 10 docs -
21 Eaton Place London SW1X 8BP
89% historically approved · decision due ~21 Sep
Like for like remedial after exposure works.
Awaiting decision 16 docs -
Basement And Ground Floor Maisonette 21 Eaton Place London SW1X 8BP
Replacement of external door at Lower Ground Floor level and installation of external security gate in front.
Refused Heritage and listed buildings 14 docs -
Basement And Ground Floor Maisonette 21 Eaton Place London SW1X 8BP
Internal alterations at lower ground floor level, including installation of damp proofing and secondary glazing to front windows.
Granted Heritage and listed buildings Windows or glazing 16 docs -
Flat 1 23 Eaton Place London SW1X 8BP
90% historically approved · decision due ~24 Jun
Erection of single-story rear extension and associated works.
Awaiting decision Heritage and listed buildings Extension 14 docs -
Flat 1 23 Eaton Place London SW1X 8BP
88% historically approved · decision due ~24 Jun
Erection of single-story rear extension and associated works.
Awaiting decision Full applications Extension 18 docs
Other amendment applications
In Westminster
-
26/07389/NMA Awaiting decision
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 5 Grittleton Road.
-
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.
-
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.
-
26/07281/NMA Awaiting decision
Brymon Court 31 - 32 Montagu Square London W1H 2LH
Amendments to planning permission dated 6 May 2026 (25/07520/FULL) for: Replacement of windows to the front, side and rear elevations with aluminium framed windows namely, to include the replacement of five doors.
-
26/07243/NMA Awaiting decision
144 Praed Street London W2 1HU
Amendments to planning permission dated 09 August 2024 (RN: 22/08247/FULL) for the replacement of the mansard roof with a sheer brickwork extension, new mansard roof extension and rooftop plant enclosure to provide additional hotel accommodation (Class C1); alterations to facade fenestration and shopfronts; installation of a green wall to the side (north-east); and associated works. NAMELY, to amend Condition 13 to require details of the modular green wall to be submitted prior to commencement of the relevant part of the development.