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Planning application

51 Upper Montagu Street London W1H 1FQ

Granted Westminster 25/03875/LBC Listed Building Consent Application

Works: Extension Windows or glazing

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.

As published by the council, reference 25/03875/LBC

Application record

Reference
25/03875/LBC
Type
Listed Building Consent Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
9 Jun 2025
Validated
9 Jun 2025
Decided
6 Oct 2025
Ward
Marylebone
Decision by
Complex Delegated Decision
Postcode
W1H 1FQ

Site history

Applications at this address on the Westminster register

This site has had 6 applications since 2025: 3 approved, 0 refused.

  • 26/07161/LBC Awaiting decision

    51 Upper Montagu Street London W1H 1FQ

    Internal alterations to include additional floor lowering within the lower ground floor WC to match the consented level of the other rooms.

    Submitted 19 Oct 2026 Heritage and listed buildings
  • 26/06443/ADFULL Awaiting decision

    51 Upper Montagu Street London W1H 1FQ

    Details of Desktop study and Site investigation reports pursuant to partial discharge of Condition 11 (Phase 2 and Phase 3) of planning permission dated 24th October 2025 (RN: 25/03874/FULL).

    Submitted 21 Sep 2026
  • 26/00898/ADFULL Awaiting decision

    51 Upper Montagu Street London W1H 1FQ

    Details of supplementary acoustic report, detailed drawings of all new doors and windows, new first floor balconettes and investigative report of Phase 1 pursuant to condition 5, 7, 8 and 11 (part) of planning permission dated 24 October 2025 (RN: 25/03874/FULL).

    Submitted 12 Feb 2026 Full applications
  • 26/00814/ADLBC Granted

    51 Upper Montagu Street London W1H 1FQ

    Detailed drawings of new doors, new windows including sections and glazing bar profiles, new skirting, and cornices, new fireplace surrounds, new Juliette balconies pursuant to condition 4 of listed building consent dated 28 October 2025 (RN: 25/03875/LBC)

    Decided 7 Apr 2026 Conditions
  • 25/03874/FULL Granted

    51 Upper Montagu Street London W1H 1FQ

    Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.

    Decided 7 Oct 2025 Full applications

Timeline

Dates from the published record

  1. 9 Jun 2025

    Received by Westminster

  2. 6 Oct 2025

    Decision issued: Application Permitted

  3. 30 Aug 2026

    Added to PlanIndex

Cases linked to this one on the register

1 later application on the register refers to this one:

  • 26/00814/ADLBC Granted

    51 Upper Montagu Street London W1H 1FQ

    Detailed drawings of new doors, new windows including sections and glazing bar profiles, new skirting, and cornices, new fireplace surrounds, new Juliette balconies pursuant to condition 4 of listed building consent dated 28 October 2025 (RN: 25/03875/LBC)

    Decided 7 Apr 2026 Conditions

Who's behind it

Company information only, from the register and Companies House

ADL Planning Pty Ltd Agent, a planning consultancy

105 applications on PlanIndex · across 7 councils · 91% granted

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

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Documents

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

37 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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What this grant of permission means

Westminster granted permission on 6 October 2025, 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 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 0.3 miles

  • 51 Upper Montagu Street London W1H 1FQ

    25/03874/FULL Submitted 9 Jun 2025 50 yards away

    Internal alterations including lowering of the floor level to the lower ground floor; Installation of replacement modern windows with slimline double-glazed units; external alterations to front and rear elevations to reinstate window baskets; installation of an air source heat pump and replacement of existing railings at main roof level; erection of the rear extension at lower ground floor level to include a green roof; and other associated works.

    Granted Full applications Extension Windows or glazing 36 docs

  • 53 Upper Montagu Street London W1H 1SE

    25/05778/ADLBC Submitted 14 Aug 2025 50 yards away

    Details of the height and finished appearance of the new openings at ground and second floor levels, and proposed remedial works required to address damp following inspection works pursuant to Condition 2 (parts i and ii) of the listed building consent dated 2 January 2025 (RN: 24/05972/LBC)

    Granted Conditions 8 docs

  • 51 Upper Montagu Street London W1H 1FQ

    26/00898/ADFULL Submitted 12 Feb 2026 50 yards away

    88% historically approved · decision due ~9 Apr

    Details of supplementary acoustic report, detailed drawings of all new doors and windows, new first floor balconettes and investigative report of Phase 1 pursuant to condition 5, 7, 8 and 11 (part) of planning permission dated 24 October 2025 (RN: 25/03874/FULL).

    Awaiting decision Full applications Windows or glazing 11 docs

  • 51 Upper Montagu Street London W1H 1FQ

    26/00814/ADLBC Submitted 11 Feb 2026 50 yards away

    Detailed drawings of new doors, new windows including sections and glazing bar profiles, new skirting, and cornices, new fireplace surrounds, new Juliette balconies pursuant to condition 4 of listed building consent dated 28 October 2025 (RN: 25/03875/LBC)

    Granted Conditions Windows or glazing 12 docs

  • 51 Upper Montagu Street London W1H 1FQ

    26/07161/LBC Submitted 19 Oct 2026 50 yards away

    90% historically approved · decision due ~18 Dec

    Internal alterations to include additional floor lowering within the lower ground floor WC to match the consented level of the other rooms.

    Awaiting decision Heritage and listed buildings

  • 51 Upper Montagu Street London W1H 1FQ

    26/06443/ADFULL Submitted 21 Sep 2026 50 yards away

    89% historically approved · decision due ~16 Nov

    Details of Desktop study and Site investigation reports pursuant to partial discharge of Condition 11 (Phase 2 and Phase 3) of planning permission dated 24th October 2025 (RN: 25/03874/FULL).

    Awaiting decision

In Westminster

  • 26/07202/LBC Awaiting decision

    Basement East And Ground Floor And First Floor 33 Weymouth Street London W1G 7BY

    Replacement of 13 doorsets with fire doors.

    Received 21 Oct, published by the council 23 Oct 2026 Heritage and listed buildings
  • 26/07183/LBC Awaiting decision

    306 - 308 Regent Street London W1B 3AT

    Installation of a manually operated retractable fabric awning to the existing shopfront at 308 Regent Street, comprising an orange fabric canopy with discreet printed lettering to the front valance, together with associated supporting framework, mounting brackets and fixings to the existing fa?ade.

    Received 21 Oct, published by the council 22 Oct 2026 Heritage and listed buildings
  • 26/07191/LBC Awaiting decision

    6 Wilton Place London SW1X 8RH

    Layout alterations and replacement of internal doors.

    Received 21 Oct, published by the council 22 Oct 2026 Heritage and listed buildings
  • 26/07199/LBC Awaiting decision

    49 Queen's Gardens London W2 3AA

    Erection of a mansard roof extension incorporating rooflights and a rear balcony; installation of Juliet balconies at ground and first floor levels to the rear; demolition of the existing courtyard extension and erection of a single-storey infill extension; extension of the rear wing at first floor (mezzanine) and second floor levels; fenestration alterations including the installation of new windows; stucco repairs and partial rebuilding of the rear extensions; and associated internal alterations at all levels. (Linked to 26/07198/FULL)

    Received 21 Oct, published by the council 23 Oct 2026 Heritage and listed buildings
  • 26/07192/LBC Awaiting decision

    119 Warwick Way London SW1V 4HS

    Conversion and internal alterations to the ground floor flat (Retrospective)

    Received 21 Oct, published by the council 23 Oct 2026 Heritage and listed buildings