Planning application
139 Castellain Mansions Castellain Road London W9 1HG
Works: Windows or glazing
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Replacement of existing 2nd floor front, side and rear windows and door with double-glazed timber sash windows and door (retaining original frames and structural openings); white paint finish to match existing.
As published by the council, reference 25/08028/FULL
Application record
- Reference
- 25/08028/FULL
- Type
- Full Planning Permission Application
- Status
- Pending
- Received
- 5 Nov 2025
- Validated
- 5 Nov 2025
- Ward
- Maida Vale
- Postcode
- W9 1HG
Timeline
Dates from the published record
-
5 Nov 2025
Received by Westminster
-
20 Jul 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 31 December 2025, 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.
Who's behind it
Company information only, from the register and Companies House
Design Extension Agent, a design practice registered in Purley
Active · incorporated 2025 · Purley
123 applications on PlanIndex · across 24 councils · 76% 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
6 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.
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