63, Blandford Street, Marylebone High Street, W1U 7HR

25/04449/FULLHouseholder planning & listed building consentPermitted

Householder

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)

Received: 5 August 2025
Decided: 3 November 2025
Council: City of Westminster

Approximate site (title boundary)

Boundary © HM Land Registry, © Ordnance Survey · details

This information is subject to Crown copyright and database rights 2026 and is reproduced with the permission of HM Land Registry. The polygons (including the associated geometry, namely x, y co-ordinates) are subject to Crown copyright and database rights 2026 Ordnance Survey AC0000851063. Conditions of use.

ReceivedSubmitted5 Aug
ValidatedValidated
Consult.Consultation
TargetTarget Date
DecidedDecided3 Nov

Decided in 90 days (council typically 49)

7 weeks typical decision time in Westminster87% of householder planning & listed building consent applications approved

This is a planning application for a dormer extension at 63, Blandford Street, Marylebone High Street, W1U 7HR. Westminster has handled 167 applications of this type and approves 87% of them, typically deciding them in 56 days. This one was decided in 90 days, 5 weeks longer than Westminster's median. The site is in the Portman Estate conservation area, with 14 listed buildings nearby. There has been 1 other application at this address. In the past year there have been 146 applications across MBW_22. We hold 1,036 applications in total for the W1U postcode area.

Application Details

Reference

25/04449/FULL

Address

63, Blandford Street, Marylebone High Street, W1U 7HR

Postcode

W1U 7HR

Local Authority

Westminster

Application Type

Householder planning & listed building consent

Decision Status

Permitted

Applicant & Agent

Planning Application Dates

Date Decided

3 November 2025

Date Submitted

5 August 2025

Planning Decision

Publicity

Appeal

Additional Information

Coordinates

51.518112, -0.155175

Enriching application data

2/3

Council recordsAppealsFlood risk

Source: Westminster

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

Track this application

Get email alerts when there is a planning decision or status change.

Get email alerts near W1U

New planning applications delivered to your inbox weekly.

Associated applications

2026
8 Sep
Variation of 25/04450/LBC
PendingListed building consentRelated26/06137/LBC
2025
5 Aug
Erection of mansard roof extension with three new front dormers, two rear dormers (one dormer window and one…
This applicationApprovedListed building consent25/04449/FULL
2025
5 Aug
Erection of mansard roof extension with three new front dormers, one dormer window (replace existing) and one…
ApprovedListed building consentPart of25/04450/LBC

Planning history at this site

4 other applications at this property, newest first.

Planning constraints

Designations that overlap or adjoin the site outline.

Conservation area: Portman Estate
Listed building: Grade II: 61 and 63, Blandford Street W1On this site · +2 more
Article 4 direction: Article 4 Basement Development Permitted Rights Removed+1 more
Flood zone 1: Low probability (rivers and sea)

Also checked, none recorded (21)

flood storage areas, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-10-09. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

What's been approved on your street?

See what the council approved and refused near this address for the project you have in mind, and the rules that apply here.

Get The Signal Report

Discuss this application on r/PlanningPermissionUK

Nearby Planning Activity