Planning application
63 Blandford Street London W1U 7HR
Works: Extension Loft or dormer Windows or glazing
Relates to 25/04450/LBC
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
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)
As published by the council, reference 25/04449/FULL
Application record
- Reference
- 25/04449/FULL
- Type
- Full Planning Permission Application
- Status
- Decided
- Decision
- Application Permitted
- Received
- 27 Jun 2025
- Validated
- 5 Aug 2025
- Decided
- 3 Nov 2025
- Ward
- Marylebone
- Decision by
- Sub-Committee
- Postcode
- W1U 7HR
Site history
Applications at this address on the Westminster register
This site has had 3 applications since 2025: 2 approved, 0 refused.
-
26/05078/ADFULL Awaiting decision
63 Blandford Street London W1U 7HR
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).
-
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)
Timeline
Dates from the published record
-
27 Jun 2025
Received by Westminster
-
5 Aug 2025
Validated
Checked as complete and ready for consideration.
-
3 Nov 2025
Decision issued: Application Permitted
-
30 Aug 2026
Added to PlanIndex
Related applications
Cases linked to this one on the register
-
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)
2 later applications on the register refer to this one:
-
26/05078/ADFULL Awaiting decision
63 Blandford Street London W1U 7HR
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).
-
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)
Who's behind it
Company information only, from the register and Companies House
Agent on file, an architecture practice registered in London
17 applications on PlanIndex · across 5 councils · 100% granted
Trade members see who it is, their full track record, and every application they have filed.
See who's behind itDocuments
Plans, drawings, consultee responses and the officer's report
32 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.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Westminster granted permission on 3 November 2025, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. 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 500 metres
-
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)
Granted Heritage and listed buildings Extension Loft or dormer +1 33 docs -
63 Blandford Street City Of Westminster London W1U 7HR
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
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
87% historically approved · decision due ~22 Sep
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).
Awaiting decision Full applications Extension Loft or dormer +2 10 docs -
22 Baker Street London W1U 3BW
Details pursuant to Condition 5 & 6 of planning permission dated 22nd April 2022 (RN: 22/01420/FULL), namely the submission of details drawings of the rooflights and PV panels at main roof level.
Granted Full applications Loft or dormer 9 docs -
58 Blandford Street London W1U 7JB
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
Other full applications
In Westminster
-
26/06024/FULL Awaiting decision
House Of Commons Palace Of Westminster Parliament Square London SW1A 0AA
Installation of new and replacement electronic equipment within Speaker. (Linked with 26/06025/LBC)
-
26/06017/FULL Awaiting decision
38 Lauderdale Mansions Lauderdale Road London W9 1NE
Installation of an external AC Unit / Heat Pump at roof level.
-
26/05938/FULL Awaiting decision
24 Vincent Square London SW1P 2NJ
Subdivision of existing residential property to create two self-contained 3-bedroom family homes, along with cycle parking and associated external alterations.
-
26/05935/FULL Awaiting decision
47 Hereford Road London W2 5AH
Installation of one number new external condenser unit to the southerly elevation service alley.
-
26/05959/FULL Awaiting decision
Basement And Ground Floor 50 New Bond Street London W1S 1BJ
Installation of three new condensers on the roof, within an existing designated plant area.