Planning application
8 Montagu Mews West London W1H 2EE
Works: Extension
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Roof extension, installation of air conditioning unit in an acoustic enclosure, alterations to the front and rear facades and associated works.
As published by the council, reference 26/03228/FULL
Application record
- Reference
- 26/03228/FULL
- Type
- Full Planning Permission Application
- Status
- Pending
- Received
- 15 May 2026
- Validated
- 15 May 2026
- Ward
- Marylebone
- Postcode
- W1H 2EE
Timeline
Dates from the published record
-
15 May 2026
Received by Westminster
-
21 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 10 July 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 66 days over the applications it decided in the last year.
Who's behind it
Company information only, from the register and Companies House
SM Planning Ltd Agent, a planning consultancy
111 applications on PlanIndex · across 23 councils · 81% granted
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
28 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 documentsWhat 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 Montagu Mews West London W1H 2EE
87% historically approved · decision due ~10 Jun
Installation of air conditioning condenser unit and acoustic enclosure to roof.
Awaiting decision Full applications 23 docs -
Flat 3 54 Montagu Square London W1H 2LP
90% historically approved · decision due ~2 Nov
Internal layout alterations and associated works.
Awaiting decision Heritage and listed buildings -
Flat 2 5 Bryanston Square London W1H 2DH
Internal alterations including repair, refurbishment and repainting of the windows and french windows; refurbishment of balconies and railings; and other associated works. (Linked with 25/07211/LBC)
Granted Full applications Windows or glazing 19 docs -
Flat 2 5 Bryanston Square London W1H 2DH
Internal alterations including replacement of windows and French Windows; refurbishment of balconies and railings; and other associated works. (Linked with 25/07257/FULL)
Granted Heritage and listed buildings Windows or glazing 17 docs -
Flat 1 49 Montagu Square London W1H 2LW
Replacement of existing single glazed sash timber windows and frames with new double glazed sash timber windows and frames - 5 windows on the front elevation. (Linked with 25/05706/LBC)
Granted Full applications Windows or glazing 24 docs -
Flat 1 49 Montagu Square London W1H 2LW
Replacement of existing single glazed sash timber windows and frames with new double glazed sash timber windows and frames - 5 windows on the front elevation. (Linked with 25/05705/FULL)
Granted Heritage and listed buildings Windows or glazing 20 docs
Other full applications
In Westminster
-
26/06331/FULL Awaiting decision
31G Nottingham Place London W1U 5LP
Installation of a condenser within acoustic enclosure and metal railing on the rear flat roof at third-floor level.
-
26/06328/FULL Awaiting decision
Athena Court 2 Finchley Road London NW8 6DP
Installation of a multifunctional communication Hub including defibrillator outside Athena Court. (Linked with 26/06329/ADV)
-
26/06325/FULL Awaiting decision
29 Norfolk Road London NW8 6AU
Hard and soft landscaping works; amendment to railings style to rear garden structures (outbuilding and pergola); external lighting; boundary treatment; refuse storage; and photovoltaic panels. (Linked with 26/06326/LBC)
-
26/06340/FULL Awaiting decision
141 Harley Street London W1G 6BQ
Variation of Condition 1 of planning permission dated 22 December 2026 (RN: 16/05372/FULL) for: Demolition of mews buildings at 28 and 29 Devonshire Mews West and lower ground and ground floor link building at the rear of 141 Harley Street and the erection of new building to include a three storey basement to the rear of the site in connection with the use of the 141 Harley Street and the lower ground and ground floor of 143 Harley Street for Class D1 medical purposes; installation of a new passenger lift to the rear of 141 Harley Street and installation of plant. (Site includes excavation part way under the pavement of Devonshire Mews West and use swap with 126 Harley Street) namely, to allow creation of party wall openings at basement, ground and first floors; insertion of a platform lift within No. 143 from basement to first floors; partial infilling of the rear basement area; and other minor adjustments to plan form. (Linked with 26/06290/LBC)
-
26/06341/FULL Awaiting decision
141 Harley Street London W1G 6BQ
Installation of new sesame lift into existing front entrance steps. (Linked with 26/06342/LBC)