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Planning application

Flat 4 9 Welbeck Street London W1G 9YB

Awaiting decision Westminster 26/01022/CLEUD Certificate of Lawfulness (existing)

Works: Windows or glazing

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

Proposal

Confirmation that the existing roof terrace above the fifth floor and its associated access/features, the external air conditioning unit at the rear of the property at fourth floor level, and the PVC windows to the front of the property at fourth and fifth floor levels are lawful.

As published by the council, reference 26/01022/CLEUD

Application record

Reference
26/01022/CLEUD
Type
Certificate of Lawfulness (existing)
Status
Pending
Received
17 Feb 2026
Validated
17 Feb 2026
Ward
Marylebone
Postcode
W1G 9YB

Timeline

Dates from the published record

  1. 17 Feb 2026

    Received by Westminster

  2. 21 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 14 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 91 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

Maddox Planning Ltd Agent, a planning consultancy

119 applications on PlanIndex · across 22 councils · 89% 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

11 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 lawful development applications in a median of 106 days. More in our guide to how long planning decisions take.

About lawful development applications

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 21 - 22 Welbeck Way London W1G 9YW

    26/00465/FULL Submitted 27 Jan 2026 50 yards away

    88% historically approved · decision due ~16 May

    Installation of 2 x condenser units roof level, including external grid deck for plant access and mounting.

    Awaiting decision Full applications 17 docs

  • 57 - 59 Welbeck Street London W1G 9BL

    04/10233/FULL Submitted 23 Dec 2004 50 yards away

    Retention of one air conditioning unit and one air handling unit at rear ground floor level.

    Granted Full applications 7 docs

  • 57 - 59 Welbeck Street London W1G 9BL

    26/04698/FULL Submitted 14 Jul 2026 50 yards away

    88% historically approved · decision due ~8 Sep

    Installation of new extraction ducting to the rear elevation of the building.

    Decided Full applications

  • 36 Wigmore Street London W1U 2BP

    25/06854/FULL Submitted 24 Sep 2025 50 yards away

    Installation of two air conditioning units located on existing roof plant deck, concealed behind an existing plant screen.

    Granted Full applications 16 docs

  • 36 Wigmore Street London W1U 2BP

    25/06855/LBC Submitted 24 Sep 2025 50 yards away

    Installation of two air conditioning units located on existing roof plant deck, concealed behind an existing plant screen.

    Granted Heritage and listed buildings 12 docs

  • 13 - 14 Welbeck Street London W1G 9BN

    22/03333/FULL Submitted 18 May 2022 50 yards away

    Internal and external alterations to the buildings including new doors, a new lightwell at lower ground floor level of 14 Welbeck Street, new rear ground floor terrace to 13 Welbeck Street and installation of plant in the front pavement vaults, at main roof level and rear first floor level.

    Granted Full applications 37 docs

In Westminster

  • 26/07468/CLOPUD Awaiting decision

    14 - 16 Great Portland Street London W1W 8QW

    Confirmation the demolition of the existing outrigger structure at fifth floor level (the Proposed Works) constitutes the lawful commencement of development pursuant to the Permission.

    Received 3 Nov, published by the council 5 Nov 2026 Lawful development
  • 26/07423/CLOPUD Awaiting decision

    103 Elgin Avenue London W9 2NP

    Painting of the decorative stonework, window frames and doors on the front elevation and front boundary wall

    Received 2 Nov, published by the council 4 Nov 2026 Lawful development
  • 26/07454/CLOPUD Awaiting decision

    10 Stratton Street London W1J 8LG

    Changes to existing windows and doors

    Received 2 Nov, published by the council 5 Nov 2026 Lawful development
  • 26/07381/CLEUD Awaiting decision

    Ground Floor Rear Flat 4 Mozart Street London W10 4LA

    Use of the ground floor rear flat as short-term visitor accommodation.

    Received 28 Oct, published by the council 5 Nov 2026 Lawful development
  • 26/07339/CLOPUD Awaiting decision

    123 Victoria Street London SW1E 6DE

    Use of part of ground floor reception area within Class E including, but not limited to, a retail café (Class E(a)).

    Received 27 Oct, published by the council 30 Oct 2026 Lawful development