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Planning application

56 DERWENT DRIVE HAYES

Awaiting decision Hillingdon 15204/APP/2026/717

Works: Extension Loft or dormer Windows or glazing

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

Proposal

Conversion of roof space to habitable use to include a hip to gable extension, rear dormer, gable end window, 2 x front roof lights, and the erection of an outbuilding to the rear garden (Application for a Certificate of Lawful Development for a Proposed Development)

As published by the council, reference 15204/APP/2026/717

Application record

Reference
15204/APP/2026/717
Status
Approval
Received
19 Mar 2026

Site history

Applications at this address on the Hillingdon register

This site has had 2 applications since 2026.

  • 15204/APP/2026/718 Awaiting decision

    56 DERWENT DRIVE HAYES

    Erection of a single storey rear extension.

    Submitted 19 Mar 2026

Timeline

Dates from the published record

  1. 19 Mar 2026

    Received by Hillingdon

  2. 7 Aug 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 14 May 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

    Hillingdon took a median of 57 days over the applications it decided in the last year.

What happens while it is decided

This application is with Hillingdon for determination, against a statutory target of eight weeks. Over the last year Hillingdon's median decision took 57 days. More in our guide to how long planning decisions take.

About this record

The published feed does not state which type of application this is; the register entry on Hillingdon's portal will say. Our guide explains the common types.