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Planning application

21 Montagu Street London W1H 7EX

Granted Westminster 25/08812/FULL Full Planning Permission Application

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

Proposal

Installation of new external vent and timber louvred door in lightwell (21-22 Montagu Street).

As published by the council, reference 25/08812/FULL

Application record

Reference
25/08812/FULL
Type
Full Planning Permission Application
Status
Decided
Decision
Granted As published: Application Permitted
Received
4 Dec 2025
Validated
24 Apr 2026
Decided
8 Jun 2026
Ward
Marylebone
Decision by
Delegated Decision
Postcode
W1H 7EX

Timeline

Dates from the published record

  1. 4 Dec 2025

    Received by Westminster

  2. 24 Apr 2026

    Validated

    Checked as complete and ready for consideration.

  3. 8 Jun 2026

    Decision issued: Application Permitted

  4. 29 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Quatrefoils Ltd Agent, registered in Ruislip

Active · incorporated 2014 · Ruislip

12 applications on PlanIndex · across 8 councils

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

15 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 8 June 2026, 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 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

  • 22 Montagu Street London W1H 7EZ

    11/05323/FULL Submitted 3 Jun 2011 50 yards away

    Installation of replacement windows on front facade.

    Granted Full applications Windows or glazing 7 docs

  • 22 Montagu Mews South London W1H 7ES

    04/09799/CAC Submitted 10 Dec 2004 50 yards away

    Demolition of roof, part rear elevation, internal partitions and floors.

    Granted Heritage and listed buildings Demolition 2 docs

  • 22 Montagu Mews South London W1H 7ES

    04/09798/FULL Submitted 10 Dec 2004 50 yards away

    Demolition of roof and replacement with extended roof and infill of rear lightwell.

    Granted Full applications Extension Demolition 9 docs

  • 26 Montagu Mews South London W1H 7ES

    25/05187/FULL Submitted 25 Jul 2025 50 yards away

    Replacement of garage doors with timber windows.

    Granted Full applications Windows or glazing 14 docs

  • 9 Upper Berkeley Street London W1H 7QA

    26/03305/FULL Submitted 19 May 2026 50 yards away

    87% historically approved · decision due ~14 Jul

    Installation of a new boosted cold water system within the existing basement vault area, including replacement of the existing vault door with a painted timber louvred door to match existing.

    Awaiting decision Full applications 7 docs

  • 11 Upper Berkeley Street London W1H 7QB

    26/05593/LBC Submitted 17 Aug 2026 50 yards away

    Installation of two roof anchor points to the inner slope of the existing front roof.

    Decided Heritage and listed buildings

In Westminster

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    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 replacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06294/FULL Awaiting decision

    15 Eaton Mews South London SW1W 9HP

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    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06317/FULL Awaiting decision

    124 Hamilton Terrace London NW8 9UT

    Replacement of existing first-floor sash windows to the front and rear elevations with traditionally detailed painted timber, slim-profile double-glazed sash windows. (Linked to 26/06318/LBC)

    Received 15 Sep, published by the council 22 Sep 2026 Full applications
  • 26/06273/FULL Awaiting decision

    9A Grosvenor Square London W1K 5AE

    Installation of natural Portland Stone paving to two front entrances. (Linked to 26/05473/LBC)

    Received 14 Sep, published by the council 22 Sep 2026 Full applications