Planning application
17 Belgrave Square London SW1X 8PG
Works: Extension Demolition Domestic
Read from the description, not a valuation. How we read the register
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Amendments to planning permission dated 13th December 2019 (RN: 18/01324/FULL) for Demolition of annexe building and replacement with rear extensions to 17 Belgrave Square and excavations to create pool hall extension under garden of 17 Belgrave Square and basement beneath mews property; all in connection with the use of the mews property and 17 Belgrave Square as two single family dwelling houses. Namely to allow proposed reconfiguration and enhancement of the area between the Main House and the Mews, including the erection of a pergola structure, minor alterations to the rear annex openings, and updated rear garden layout.
As published by the council, reference 26/02370/NMA
Application record
- Reference
- 26/02370/NMA
- Type
- Non-material amendments
- Status
- Pending
- Received
- 10 Apr 2026
- Validated
- 10 Apr 2026
- Ward
- Knightsbridge & Belgravia
- Postcode
- SW1X 8PG
Site history
Applications at this address on the Westminster register
This site has had 15 applications since 2025: 2 approved, 0 refused.
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26/05327/ADLBC Decided
17 Belgrave Square London SW1X 8PG
Details of windows, doors, garage doors, roof lantern and new lighting and flooring in the principal rooms pursuant to condition 6 of listed building consent dated 18 August 2025 (RN: 25/03417/LBC)
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26/04850/ADLBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawings of garage doors, roof lantern and any new lighting and flooring in the principal rooms pursuant to condition 6 (iii) (iv) (v) of listed building 18th August 2025 (RN:25/03417/LBC)
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26/04761/ADFULL Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawings of windows, doors, garage doors, which should appear as side hung, not up and over and roof Lantern pursuant to condition 6 of planning permission dated 13th December 2019 (RN:18/01324).
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26/04710/ADFULL Decided
17 Belgrave Square London SW1X 8PG
Details of secure cycle storage and details of how waste and recycling is going to be stored on the site pursuant to condition 16 and 19 of planning permission dated 13th December 2019 (RN:18/01324/FULL)
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26/03541/ADLBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawing of floor build-up of the underfloor heating system; pursuant to condition 12 of Listed building consent dated 30th May 2025 (RN 25/02106/LBC)
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26/03052/ADFULL Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition 6 of planning permission dated 18th August 2025 (RN:25/03416/FULL)
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26/03058/ADLBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition 12 of planning permission dated 18th August 2025 (RN:25/03417/LBC )
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26/03059/ADLBC Awaiting decision
17 Belgrave Square London SW1X 8PG
detailed drawings at a scale of 1:10 and sections at 1:5 of Windows, Doors, Garage Doors, which should appear as side hung, not up and over; Roof Lantern and any new lighting and flooring in the principal rooms pursuant to discharge of condition 6 of listed building consent dated 21st August 2025 (RN: 25, 03417/LBC).
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26/03054/FULL Awaiting decision
17 Belgrave Square London SW1X 8PG
Reconfiguration and alteration of the area between the main building and the Mews, including the erection of a pergola structure, alterations to the rear annex openings, updated rear garden layout.
-
26/03051/LBC Awaiting decision
17 Belgrave Square London SW1X 8PG
Removal of Condition 10 of listed building consent dated 18th August 2025 (RN:25/03417/LBC) for: Replacement and erection of five air condenser units within acoustic enclosure on main roof of 17 Belgrave Square, two new air condenser units within two separate enclosures on rear ground floor terrace to 17 Belgrave Mews West and internal air conditioning units. Internal and external alterations, including alteration to conservatory, internal layout changes, installation of underfloor heating system, and removal and replacement of floorboards, doors and MEP services namely, to remove the requirement to carry out a paint analysis of the principal rooms.
Timeline
Dates from the published record
-
10 Apr 2026
Received by Westminster
-
21 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 5 June 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 64 days over the applications it decided in the last year.
Who's behind it
Company information only, from the register and Companies House
Montagu Evans LLP Agent, registered in London
Active · incorporated 2005 · London
1,074 applications on PlanIndex · across 120 councils · 98% granted
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See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
26 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.
Trade members open them 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 amendment applications in a median of 54 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 500 metres
-
17 Belgrave Square London SW1X 8PG
87% historically approved · decision due ~3 Jul
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition 6 of planning permission dated 18th August 2025 (RN:25/03416/FULL)
Awaiting decision Full applications 10 docs -
17 Belgrave Square London SW1X 8PG
91% historically approved · decision due ~3 Jul
Detailed drawings showing the roof top acoustic enclosure shall be painted light grey pursuant to condition 12 of planning permission dated 18th August 2025 (RN:25/03417/LBC )
Awaiting decision Conditions 10 docs -
17 Belgrave Square London SW1X 8PG
91% historically approved · decision due ~3 Jul
detailed drawings at a scale of 1:10 and sections at 1:5 of Windows, Doors, Garage Doors, which should appear as side hung, not up and over; Roof Lantern and any new lighting and flooring in the principal rooms pursuant to discharge of condition 6 of listed building consent dated 21st August 2025 (RN: 25, 03417/LBC).
Awaiting decision Conditions Windows or glazing 33 docs -
17 Belgrave Square London SW1X 8PG
87% historically approved · decision due ~10 Jul
Details of the elevations and sections of the new windows (scaled 1:10) showing integral glazing bars and of the new external doors (scaled 1:10) showing integral glazing bars pursuant to condition 4 of planning permission dated 21st August 2025 (RN: 25/04566/FULL) Linked to 26/03061/ADLBC.
Awaiting decision Full applications Windows or glazing 10 docs -
17 Belgrave Square London SW1X 8PG
90% historically approved · decision due ~5 Jun
Internal alterations.
Awaiting decision Heritage and listed buildings 28 docs -
17 Belgrave Square London SW1X 8PG
89% historically approved · decision due ~10 Sep
Detailed drawings of windows, doors, garage doors, which should appear as side hung, not up and over and roof Lantern pursuant to condition 6 of planning permission dated 13th December 2019 (RN:18/01324).
Awaiting decision Windows or glazing
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