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Planning application

17 Belgrave Square London SW1X 8PG

Awaiting decision Westminster 26/03051/LBC Listed Building Consent Application

Works: Extension

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

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.

As published by the council, reference 26/03051/LBC

Application record

Reference
26/03051/LBC
Type
Listed Building Consent Application
Status
Pending
Received
8 May 2026
Validated
8 May 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.

  • 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)

    Submitted 6 Aug 2026
  • 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)

    Submitted 20 Jul 2026 Conditions
  • 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).

    Submitted 16 Jul 2026
  • 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)

    Submitted 14 Jul 2026
  • 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)

    Submitted 29 May 2026 Conditions
  • 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)

    Submitted 8 May 2026 Full applications
  • 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 )

    Submitted 8 May 2026 Conditions
  • 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).

    Submitted 8 May 2026 Conditions
  • 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.

    Submitted 8 May 2026 Full applications
  • 26/03053/ADFULL Awaiting decision

    17 Belgrave Square London SW1X 8PG

    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.

    Submitted 8 May 2026 Full applications

Timeline

Dates from the published record

  1. 8 May 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 3 July 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

Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.

See their track record

Documents

Plans, drawings, consultee responses and the officer's report

6 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 documents

What 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 heritage and listed building applications in a median of 93 days. More in our guide to how long planning decisions take.

About heritage and listed building applications

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

Nearby applications

Within 500 metres

  • 17 Belgrave Square London SW1X 8PG

    26/03054/FULL Submitted 8 May 2026 0m away

    87% historically approved · decision due ~10 Jul

    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.

    Awaiting decision Full applications 51 docs

  • 17 Belgrave Square London SW1X 8PG

    26/03541/ADLBC Submitted 29 May 2026 5m away

    91% historically approved · decision due ~24 Jul

    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)

    Awaiting decision Conditions 3 docs

  • 17 Belgrave Square London SW1X 8PG

    25/06935/FULL Submitted 26 Sep 2025 6m away

    Part refurbishment, part replacement, of the existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at 17 Belgrave Mews West. (Linked with 25/06936/LBC)

    Granted Full applications Windows or glazing 153 docs

  • 17 Belgrave Square London SW1X 8PG

    25/06936/LBC Submitted 26 Sep 2025 6m away

    Part refurbishment, part replacement, of the existing windows on all elevations of the building at 17 Belgrave Square and adjacent mews at 17 Belgrave Mews West. (Linked with 25/06935/FULL)

    Granted Heritage and listed buildings Windows or glazing 153 docs

  • 18 Belgrave Mews West London SW1X 8PX

    26/01147/LBC Submitted 24 Feb 2026 15m away

    90% historically approved · decision due ~3 Jun

    Repainting and stucco render repair to front façade of 18 Belgrave Square, installation of replacement EWI render system of rear elevation (18 Belgrave Mews West) and courtyard facing elevations, replacement of external venetian blinds and installation of powder coated aluminium over cills to existing concrete cills (site includes 18 Belgrave Mews)

    Awaiting decision Heritage and listed buildings 19 docs

  • Open Space Belgrave Square London SW1X 8PS

    26/00605/TPO Submitted 3 Feb 2026 19m away

    100% historically approved · decision due ~31 Mar

    T4477 - Laburnum anagyroides: Remove faulted stem(s) - declining, bark damaged stem with dead top, to prevent continued decline causing instability and failure onto the garden footpath. See images.

    Awaiting decision Trees 9 docs

In Westminster

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    106 Blandford Street London W1U 8AG

    Installation of two roof-mounted anchor posts. (Linked to 26/06202/FULL)

    10 Sep 2026 Heritage and listed buildings
  • 26/06187/LBC Awaiting decision

    4 Shepherd Market London W1J 7QB

    Installation of wall mounted highway street light on to the facade of 4 Shepherd Market.

    10 Sep 2026 Heritage and listed buildings
  • 26/06176/LBC Awaiting decision

    46 Gloucester Place London W1U 8HG

    Installation of 1,100 mm high protective railings along the existing roof-level access walkway. (Linked to 26/06178/FULL)

    9 Sep 2026 Heritage and listed buildings
  • 26/06165/LBC Awaiting decision

    17 Hertford Street London W1J 7RS

    Internal alterations to the basement including new lightweight timber-stud partitions to reorganise the existing basement layout; Installation of new sanitaryware in a newly configured bathroom; Replacement of modern kitchen fittings; and Installation of traditional four-panel timber doors, architraves and ironmongery designed to match existing doors.

    9 Sep 2026 Heritage and listed buildings
  • 26/06150/LBC Awaiting decision

    37 Crawford Street London W1H 1HA

    Use of the First, Second and Third Floors as residential units (Class C3) with Office (or other Use Class E) Use retained at Basement and Ground Floor Levels. (Linked with 26/06149/FULL)

    9 Sep 2026 Heritage and listed buildings