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Planning application

20 - 21 Cavendish Square London W1G 0RN

Awaiting decision Westminster 26/03509/FULL Full Planning Permission Application

Works: Extension Loft or dormer Roofing

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

Proposal

Installation of replacement roof top plant with a dummy mansard roof extension, replacement plant at ground floor and new third floor roof structure and new substation at the lower ground floor. [Linked to 26/03510/LBC]

As published by the council, reference 26/03509/FULL

Application record

Reference
26/03509/FULL
Type
Full Planning Permission Application
Status
Pending
Received
28 May 2026
Validated
28 May 2026
Ward
West End
Postcode
W1G 0RN

Site history

Applications at this address on the Westminster register

This site has had 3 applications since 2026.

  • 26/03510/LBC Awaiting decision

    20 - 21 Cavendish Square London W1G 0RN

    Installation of replacement roof top plant with a dummy mansard roof extension, replacement plant at ground floor and new third floor roof structure and new substation at the lower ground floor. [Linked to 26/03509/FULL]

    Submitted 28 May 2026 Heritage and listed buildings
  • 26/03232/ADV Awaiting decision

    20 - 21 Cavendish Square London W1G 0RN

    Display of a flag measuring 2.15m x 1.12m.

    Submitted 15 May 2026 Advertising

Timeline

Dates from the published record

  1. 28 May 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 23 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 91 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

Rolfe Judd Planning Ltd Agent, a planning consultancy registered in The Oval

Active · incorporated 1992 · The Oval

598 applications on PlanIndex · across 26 councils · 95% 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

28 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.

Watch members (£5 a month) open the document list 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 full applications in a median of 119 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

  • 20 - 21 Cavendish Square London W1G 0RN

    26/03232/ADV Submitted 15 May 2026 50 yards away

    82% historically approved · decision due ~10 Jul

    Display of a flag measuring 2.15m x 1.12m.

    Awaiting decision Advertising 7 docs

  • 20 - 21 Cavendish Square London W1G 0RN

    26/03510/LBC Submitted 28 May 2026 50 yards away

    90% historically approved · decision due ~23 Jul

    Installation of replacement roof top plant with a dummy mansard roof extension, replacement plant at ground floor and new third floor roof structure and new substation at the lower ground floor. [Linked to 26/03509/FULL]

    Awaiting decision Heritage and listed buildings Extension Loft or dormer +1 27 docs

  • Payphone Site Outside 1 Old Cavendish Street London W1G 0NE

    12/01065/ADV Submitted 6 Feb 2012 50 yards away

    Single sided vinyl advert measuring 646mm x 1770mm attached to one glazed face of each of two conjoined payphones located outside 1 Old Cavendish Street (West of 'John Lewis' department store)

    Refused Advertising Windows or glazing 10 docs

  • Cavendish House 18 Cavendish Square London W1G 0PJ

    25/06186/LBC Submitted 1 Sep 2025 100 yards away

    Removal of double doorway with surrounding frame and glazing, provision of matwell, refurbishment of C20th and C21st elements.

    Granted Heritage and listed buildings Windows or glazing 19 docs

  • Cavendish Court 11 - 15 Wigmore Street London W1U 1PF

    03/08496/AD7 Submitted 4 Nov 2003 100 yards away

    Display for a temporary period of six months of a non-illuminated 'to let' board located on the face of the building at a height of between 3m and 4.6m above pavement level and measuring 1.2m x 0.9m.

    Granted Advertising 2 docs

  • Basement Floor And Ground Floor 19 Wigmore Street London W1U 1PH

    22/05404/ADFULL Submitted 8 Aug 2022 100 yards away

    Details of waste storage and cycle parking pursuant to Conditions 3 and 4 of planning permission dated 08 June 2022 (RN:22/02645/FULL)

    Granted Full applications 9 docs

In Westminster

  • 26/07528/FULL Awaiting decision

    69 Eaton Place London SW1X 8DF

    Installation of new cast iron water pipe on rear courtyard elevation. (Linked with 26/07529/LBC)

    Received 5 Nov, published by the council 6 Nov 2026 Full applications
  • 26/05200/FULL Decided

    1 The Court House 165 Seymour Place London W1H 4PU

    Installation of waterproofing system to the existing lead flat roofs

    Received 3 Aug, published by the council 28 Aug 2026 Full applications
  • 26/07521/FULL Awaiting decision

    Flat 18 Harlequin Court 20 Tavistock Street London WC2E 7NZ

    Installation of one external condenser unit

    Received 4 Nov, published by the council 6 Nov 2026 Full applications
  • 26/07508/FULL Awaiting decision

    Buckingham Palace The Mall London SW1A 1AA

    Replacement of existing security lighting to the Buckingham Palace Forecourt with 80 compact LED spotlights installed within the lantern clusters across 10 principal piers, with associated concealed cabling and reversible fixings. (Linked with 26/07509/LBC)

    Received 4 Nov, published by the council 5 Nov 2026 Full applications
  • 26/07472/FULL Awaiting decision

    Flat 3 82 New Cavendish Street London W1G 9TA

    Replacement windows to second floor level with vacuum, double glazing windows. (Linked with 26/07473/LBC)

    Received 3 Nov, published by the council 6 Nov 2026 Full applications