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Planning application

63 Blandford Street London W1U 7HR

Awaiting decision Westminster 26/05078/ADFULL Approval of Details (Full PP)

Works: Extension Loft or dormer Roofing Windows or glazing

Relates to 25/04449/FULL

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

Proposal

Details of written photographic specification of the materials; exterior of the new extension; new windows, rooflights, and doors; new roof balustrade to rear; and new solar panels pursuant to conditions 4 and 5 of planning permission dated 03 November 2025 (RN: 25/04449/FULL).

As published by the council, reference 26/05078/ADFULL

Application record

Reference
26/05078/ADFULL
Type
Approval of Details (Full PP)
Status
Pending
Received
28 Jul 2026
Validated
28 Jul 2026
Ward
Marylebone
Postcode
W1U 7HR

Site history

Applications at this address on the Westminster register

This site has had 4 applications since 2025: 2 approved, 0 refused.

  • 26/06137/LBC Awaiting decision

    63 Blandford Street London W1U 7HR

    Variation of 25/04450/LBC to allow raising of the chimney stack to retain the same height relationship to the roof; formation of a brick party wall; provision of dormer windows to match neighbouring dormer profiles, alteration of the rear dormers to casement doors; and alteration to the proposed stair to the fourth floor. (Linked to 26/04651/FULL)

    Submitted 8 Sep 2026 Heritage and listed buildings
  • 25/04450/LBC Granted

    63 Blandford Street London W1U 7HR

    Erection of mansard roof extension with three new front dormers, one dormer window (replace existing) and one dormer door to the rear, raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level (Linked to 25/04449/FULL)

    Decided 3 Nov 2025 Heritage and listed buildings
  • 25/04449/FULL Granted

    63 Blandford Street London W1U 7HR

    Erection of mansard roof extension with three new front dormers, two rear dormers (one dormer window and one dormer door), raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level. (Linked to 25/04450/LBC)

    Decided 3 Nov 2025 Full applications

Timeline

Dates from the published record

  1. 28 Jul 2026

    Received by Westminster

  2. 4 Aug 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 22 September 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 65 days over the applications it decided in the last year.

Cases linked to this one on the register

  • 25/04449/FULL Granted

    63 Blandford Street London W1U 7HR

    Erection of mansard roof extension with three new front dormers, two rear dormers (one dormer window and one dormer door), raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level. (Linked to 25/04450/LBC)

    Decided 3 Nov 2025 Full applications

Who's behind it

Company information only, from the register and Companies House

Studio Act Agent

3 applications on PlanIndex

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

10 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 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

  • 63 Blandford Street London W1U 7HR

    26/06137/LBC Submitted 8 Sep 2026 50 yards away

    90% historically approved · decision due ~3 Nov

    Variation of 25/04450/LBC to allow raising of the chimney stack to retain the same height relationship to the roof; formation of a brick party wall; provision of dormer windows to match neighbouring dormer profiles, alteration of the rear dormers to casement doors; and alteration to the proposed stair to the fourth floor. (Linked to 26/04651/FULL)

    Awaiting decision Heritage and listed buildings Loft or dormer Windows or glazing

  • 63 Blandford Street London W1U 7HR

    25/04450/LBC Submitted 27 Jun 2025 50 yards away

    Erection of mansard roof extension with three new front dormers, one dormer window (replace existing) and one dormer door to the rear, raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level (Linked to 25/04449/FULL)

    Granted Heritage and listed buildings Extension Loft or dormer +1 33 docs

  • 63 Blandford Street City Of Westminster London W1U 7HR

    25/04451/FULL Submitted 27 Jun 2025 50 yards away

    Erection of mono-pitched and sheer roof extension to rear with two sash windows and a single timber door to the rear, raise chimney height by 330mm, installation of six over six pane slimline double glazed timber sash windows and installation of new roof top photovoltaic panels and associated internal alterations. (Linked to 25/04452/LBC)

    Granted Full applications Extension Roofing +1 33 docs

  • 63 Blandford Street City Of Westminster London W1U 7HR

    25/04452/LBC Submitted 27 Jun 2025 50 yards away

    Erection of mono-pitched and sheer roof extension to rear with two sash windows and a single timber door to the rear, raise chimney height by 330mm, installation of six over six pane slimline double glazed timber sash windows and installation of new roof top photovoltaic panels and associated internal alterations. (Linked to 25/04451/FULL)

    Granted Heritage and listed buildings Extension Roofing +1 31 docs

  • 63 Blandford Street London W1U 7HR

    25/04449/FULL Submitted 27 Jun 2025 50 yards away

    Erection of mansard roof extension with three new front dormers, two rear dormers (one dormer window and one dormer door), raising height of chimney by 330mm, installation of 6 over 6 pane slimline double glazed timber sash windows, installation of photovoltaic panels at roof level. (Linked to 25/04450/LBC)

    Granted Full applications Extension Loft or dormer +1 32 docs

  • 58 Blandford Street London W1U 7JB

    25/08843/ADV Submitted 5 Dec 2025 50 yards away

    Display of non-illuminated vinyls applied to windows at no.58 no. 60 and no.62 for a temporary period till 28 February 2026 (Retrospective).

    Granted Advertising Windows or glazing 6 docs

In Westminster

  • 26/06295/FULL Awaiting decision

    15 Warwick Way London SW1V 1QT

    Installation of a new shopfront.

    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 repolacement window and installation of double opening door.

    Received 15 Sep, published by the council 17 Sep 2026 Full applications
  • 26/06234/FULL Awaiting decision

    40 Grosvenor Place London SW1X 7HJ

    Use of lower ground floor of Unit 3 and ground floor of Unit 2 as gym (Class E(d)) and/ or office (Class E(g))

    Received 11 Sep, published by the council 18 Sep 2026 Full applications
  • 26/06249/FULL Awaiting decision

    53 Wimpole Street London W1G 8YH

    Removal and Installation of external rear air condensers and associated pipe work to ground floor, including internal works to ground and first floor. (Linked with 26/06250/LBC)

    Received 11 Sep, published by the council 18 Sep 2026 Full applications
  • 26/03576/FULL Decided

    15A Devonshire Terrace London W2 3DW

    Erection of an infill extension to basement courtyard to form new bedroom and internal alterations. (Linked with 26/03577/LBC)

    Received 1 Jun, published by the council 11 Sep 2026 Full applications