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Planning application

Basement And Ground Floor 38 Montagu Square London W1H 2LL

Awaiting decision Westminster 26/00837/FULL Full Planning Permission Application

Works: Extension Loft or dormer Demolition

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

Proposal

Variation of condition 4(b) of planning permission dated 28 December 2023 (RN 23/07346/FULL) for the demolition of existing roof and erection of a mansard roof extension at first floor level and alterations to the front and rear of the portion of the building fronting onto Bryanston Mews East. Subdivision and reconfiguration of existing ground and lower ground floor levels of the building and together with the new first floor extension to the mews portion of the building, create two self-contained residential units (Class C3) and associated external alterations. Lowering of front pavement vault [Site includes 22 Bryanston Mews East] (Linked with 23/07347/LBC) NAMELY, to amend the wording of condition 4 (b) to remove reference of the approved rooflights are to be conservation rooflights and low profile horizontal rooflights.

As published by the council, reference 26/00837/FULL

Application record

Reference
26/00837/FULL
Type
Full Planning Permission Application
Status
Pending
Received
11 Feb 2026
Validated
11 Feb 2026
Ward
Marylebone
Postcode
W1H 2LL

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2025: 0 approved, 1 refused.

  • 26/01422/LBC Awaiting decision

    Basement And Ground Floor 38 Montagu Square London W1H 2LL

    Variation of condition 4(b) of listed building consent dated 28 December 2023 (RN 23/07347/LBC) for the demolition of existing roof and erection of a mansard roof extension at first floor level and alterations to the front and rear of the portion of the building fronting onto Bryanston Mews East. Subdivision and reconfiguration of existing ground and lower ground floor levels of the building and together with the new first floor extension to the mews portion of the building, create two self-contained residential units (Class C3) and associated external alterations. Lowering of front pavement vault [Site includes 22 Bryanston Mews East] (Linked with 23/07346/FULL) NAMELY, to replace the wording of "conservation rooflights" with "low profile horizontal rooflights". (Linked to 26/00837/FULL)

    Submitted 10 Feb 2026 Heritage and listed buildings
  • 25/09024/ADFULL Refused

    Basement And Ground Floor 38 Montagu Square London W1H 2LL

    Details of the new rooflights, demonstrating that these are conservation rooflights pursuant to condition 4 (B) of listed building dated 28th December 2023 (RN: 23/07347/LBC)

    Decided 21 Jan 2026 Full applications

Timeline

Dates from the published record

  1. 11 Feb 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 8 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 66 days over the applications it decided in the last year.

Cases linked to this one on the register

1 later application on the register refers to this one:

  • 26/01422/LBC Awaiting decision

    Basement And Ground Floor 38 Montagu Square London W1H 2LL

    Variation of condition 4(b) of listed building consent dated 28 December 2023 (RN 23/07347/LBC) for the demolition of existing roof and erection of a mansard roof extension at first floor level and alterations to the front and rear of the portion of the building fronting onto Bryanston Mews East. Subdivision and reconfiguration of existing ground and lower ground floor levels of the building and together with the new first floor extension to the mews portion of the building, create two self-contained residential units (Class C3) and associated external alterations. Lowering of front pavement vault [Site includes 22 Bryanston Mews East] (Linked with 23/07346/FULL) NAMELY, to replace the wording of "conservation rooflights" with "low profile horizontal rooflights". (Linked to 26/00837/FULL)

    Submitted 10 Feb 2026 Heritage and listed buildings

Who's behind it

Company information only, from the register and Companies House

Peek Architecture Ltd Agent, an architecture practice

75 applications on PlanIndex · across 6 councils · 76% 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

4 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 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 full applications in a median of 91 days. More in our guide to how long planning decisions take.

About full applications

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • Basement And Ground Floor 38 Montagu Square London W1H 2LL

    25/09024/ADFULL Submitted 12 Dec 2025 50 yards away

    Details of the new rooflights, demonstrating that these are conservation rooflights pursuant to condition 4 (B) of listed building dated 28th December 2023 (RN: 23/07347/LBC)

    Refused Full applications Loft or dormer 5 docs

  • Basement And Ground Floor 38 Montagu Square London W1H 2LL

    26/01422/LBC Submitted 10 Feb 2026 50 yards away

    90% historically approved · decision due ~7 Apr

    Variation of condition 4(b) of listed building consent dated 28 December 2023 (RN 23/07347/LBC) for the demolition of existing roof and erection of a mansard roof extension at first floor level and alterations to the front and rear of the portion of the building fronting onto Bryanston Mews East. Subdivision and reconfiguration of existing ground and lower ground floor levels of the building and together with the new first floor extension to the mews portion of the building, create two self-contained residential units (Class C3) and associated external alterations. Lowering of front pavement vault [Site includes 22 Bryanston Mews East] (Linked with 23/07346/FULL) NAMELY, to replace the wording of "conservation rooflights" with "low profile horizontal rooflights". (Linked to 26/00837/FULL)

    Awaiting decision Heritage and listed buildings Extension Loft or dormer +1 6 docs

  • Flat 1 40 Montagu Square London W1H 2LL

    25/09109/LBC Submitted 17 Dec 2025 50 yards away

    Internal alterations at ground and first floor levels.

    Granted Heritage and listed buildings 45 docs

  • 16 Bryanston Mews East London W1H 2DB

    26/05412/FULL Submitted 10 Aug 2026 50 yards away

    87% historically approved · decision due ~5 Oct

    Installation of an air source heat pump and air conditioning condenser unit within acoustic enclosures on the flat roof area at rear first floor level.

    Awaiting decision Full applications

  • 16 Bryanston Mews East London W1H 2DB

    26/05413/FULL Submitted 10 Aug 2026 50 yards away

    87% historically approved · decision due ~5 Oct

    Installation of an air source heat pump within an acoustic enclosure on the flat roof at rear first floor level.

    Awaiting decision Full applications

  • Flat 3 35 Montagu Square London W1H 2LJ

    23/04938/LBC Submitted 18 Jul 2023 50 yards away

    Installation of a stairlift within Flat 3.

    Granted Heritage and listed buildings 13 docs

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06297/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Alterations to rear elevation at basement level comprising repolacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06287/FULL Awaiting decision

    Barness Court 6 - 8 Westbourne Terrace London W2 3UW

    Installation of a new riser as per GW10 design comprising a single riser with 7 entries and 9 Taylor valves to be installed. (Linked with 26/06288/LBC)

    Received 14 Sep, published by the council 21 Sep 2026 Full applications
  • 26/06278/FULL Awaiting decision

    40 Wellington Road London NW8 9TJ

    Installation of a new external access ramp/slope to provide accessibility to the Barclays bank ATM.

    Received 14 Sep, published by the council 21 Sep 2026 Full applications
  • 26/06269/FULL Awaiting decision

    Maisonette Basement And Ground Floor 101 Hereford Road London W2 5BB

    Amalgamation of existing lower ground and ground floor maisonette with the first floor flat to create a single dwelling and associated internal works including creation of a staircase. (Linked with 26/06270/LBC)

    Received 14 Sep, published by the council 21 Sep 2026 Full applications