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Planning application

9 Mansfield Street London W1G 9NZ

Awaiting decision Westminster 25/06412/FULL Full Planning Permission Application

Works: Extension Loft or dormer Roofing Windows or glazing Domestic

Read from the description, not a valuation. How we read the register

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

Proposal

Use as building as a single family dwellinghouse (Class C3). External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct part of brick parapet, installation of plant at main roof level . [SITE INCLUDES 6 MANSFIELD MEWS]

As published by the council, reference 25/06412/FULL

Application record

Reference
25/06412/FULL
Type
Full Planning Permission Application
Status
Pending
Received
8 Sep 2025
Validated
25 Sep 2025
Ward
Marylebone
Postcode
W1G 9NZ

Site history

Applications at this address on the Westminster register

This site has had 2 applications since 2025.

  • 25/06413/LBC Awaiting decision

    9 Mansfield Street London W1G 9NZ

    External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct port of brick parapet, installation of plant at main roof level. Internal alterations throughout [SITE INCLUDES 6 MANSFIELD MEWS]

    Submitted 8 Sep 2025 Heritage and listed buildings

Timeline

Dates from the published record

  1. 8 Sep 2025

    Received by Westminster

  2. 25 Sep 2025

    Validated

    Checked as complete and ready for consideration.

  3. 21 Jul 2026

    Added to PlanIndex

  4. Decision

    Awaiting decision

    Decision expected by 20 November 2025, 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.

Who's behind it

Company information only, from the register and Companies House

Newmark LLP Agent

921 applications on PlanIndex · across 40 councils · 97% granted

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Documents

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

156 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

  • 9 Mansfield Street London W1G 9NZ

    25/06413/LBC Submitted 8 Sep 2025 50 yards away

    90% historically approved · decision due ~20 Nov

    External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct port of brick parapet, installation of plant at main roof level. Internal alterations throughout [SITE INCLUDES 6 MANSFIELD MEWS]

    Awaiting decision Heritage and listed buildings Extension Loft or dormer +2 152 docs

  • 2 Mansfield Street London W1G 9NZ

    26/05715/LBC Submitted 20 Aug 2026 50 yards away

    90% historically approved · decision due ~15 Oct

    Installation of full fibre cables on and through the building.

    Awaiting decision Heritage and listed buildings

  • 2 Mansfield Street London W1G 9NZ

    26/05036/LBC Submitted 27 Jul 2026 50 yards away

    90% historically approved · decision due ~21 Sep

    Installation of external air conditioning condenser unit at main roof level, associated external pipework and associated internal modifications (Flat 41).

    Decided Heritage and listed buildings 1 doc

  • 2 Mansfield Street London W1G 9NZ

    26/05035/FULL Submitted 27 Jul 2026 50 yards away

    87% historically approved · decision due ~21 Sep

    Installation of an external air conditioning condenser unit at main roof level and associated external pipework (Flat 41).

    Decided Full applications 10 docs

  • Orbis House 5 Mansfield Street London W1G 9NG

    25/08080/CLEUD Submitted 6 Nov 2025 50 yards away

    86% historically approved · decision due ~1 Jan

    Confirmation that the material change of use from office to use as a single family dwelling house under planning permission (RN 12/09926/FULL) has taken place and that use as a single family dwelling house is now the building's existing lawful use.

    Awaiting decision Lawful development 20 docs
    Domestic

  • Orbis House 5 Mansfield Street London W1G 9NG

    26/04876/LBC Submitted 21 Jul 2026 50 yards away

    90% historically approved · decision due ~15 Sep

    Provision of guarding system to provide safe access for maintenance across the roof; alteration at south elevations omitting window SFW11 from the new WC, remove the existing RWP from the internal courtyard corner, removal of the existing plastic section of a redundant vent pipe at lower level and retain original lead; new cast iron rain water pipes at west elevation; and internal layout alterations at basement, ground, 2nd, 3rd floors. (Linked with 26/04873/NMA)

    Decided Heritage and listed buildings Windows or glazing

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront with Medication Dispensing Outlet.

    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

    Installation of railings and sliding lantern light at main roof level in connection with the use of the roof as a terrace.

    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