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Planning application

1 Devonshire Close London W1G 7BA

Refused Westminster 25/05262/FULL Full Planning Permission Application

Works: Extension Loft or dormer Domestic

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

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

Proposal

Erection of a mansard roof extension at second floor level and alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling.

As published by the council, reference 25/05262/FULL

Application record

Reference
25/05262/FULL
Type
Full Planning Permission Application
Status
Decided
Decision
Refused As published: Application Refused
Received
28 Jul 2025
Validated
21 Aug 2025
Decided
14 Oct 2025
Ward
Marylebone
Decision by
Delegated Decision
Postcode
W1G 7BA

Site history

Applications at this address on the Westminster register

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

  • 25/08126/FULL Awaiting decision

    1 Devonshire Close London W1G 7BA

    Erection of a mansard roof extension at second floor level and alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling (Class C3).

    Submitted 7 Nov 2025 Full applications
  • 25/05261/FULL Granted

    1 Devonshire Close London W1G 7BA

    Erection of a single storey mansard roof extension and extensions at rear ground and first floor levels. Alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling.

    Decided 14 Oct 2025 Full applications

Timeline

Dates from the published record

  1. 28 Jul 2025

    Received by Westminster

  2. 21 Aug 2025

    Validated

    Checked as complete and ready for consideration.

  3. 14 Oct 2025

    Decision issued: Application Refused

  4. 21 Jul 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Emrys Architects Agent, an architecture practice

8 applications on PlanIndex · across 3 councils

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Documents

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

40 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 refusal means

Westminster refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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

  • 1 Devonshire Close London W1G 7BA

    25/08126/FULL Submitted 7 Nov 2025 50 yards away

    87% historically approved · decision due ~2 Jan

    Erection of a mansard roof extension at second floor level and alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling (Class C3).

    Awaiting decision Full applications Extension Loft or dormer 38 docs
    Domestic

  • 1 Devonshire Close London W1G 7BA

    25/05261/FULL Submitted 28 Jul 2025 50 yards away

    Erection of a single storey mansard roof extension and extensions at rear ground and first floor levels. Alterations to the front and rear elevations all in connection with the continued use of the property as a single family dwelling.

    Granted Full applications Extension Loft or dormer 42 docs
    Small domestic

  • 110 Harley Street London W1G 7JG

    25/09033/LBC Submitted 12 Dec 2025 50 yards away

    Installation of a PVC duct within the basement lightwell to facilitate an external fibre cable routing and a fibre termination box, installation of internal fibre cabling from the termination point to a communications rack located within the basement communications room.

    Granted Heritage and listed buildings 13 docs

  • 110 Harley Street London W1G 7JG

    08/04423/ADLBC Submitted 21 May 2008 50 yards away

    Details of the new partition in the rear ground floor room pursuant to Condition 2 (iii) of listed building consent dated 28 August 2007 (RN: 07/05860).

    Granted Conditions 7 docs

  • 110 Harley Street London W1G 7JG

    08/03584/FULL Submitted 18 Apr 2008 50 yards away

    Alterations during the course of construction to permission granted 14 February 2008 (RN: 08/00105/FULL) for installation of three external air conditioning units in rear lightwell at basement and ground floor levels; replacement of double doors and windows with glass louvres at fourth floor level: namely alterations to internal and external air conditioning equipment at basement, ground and roof level and internal partitions.

    Granted Full applications Windows or glazing 9 docs

  • 110 Harley Street London W1G 7JG

    08/03585/LBC Submitted 18 Apr 2008 50 yards away

    Alterations during the course of construction to permission granted 14th of February 2008 (RN: 08/00106/LBC) for installation of three external air conditioning units in rear lightwell at basement and ground floor levels; replacement of double doors and windows with glass louvres at fourth floor level: namely alterations to internal and external air conditioning equipment at basement, ground and roof level and internal partitions.

    Granted Heritage and listed buildings Windows or glazing 2 docs

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