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Planning application

101 GROSVENOR CRESCENT HILLINGDON

Awaiting decision Hillingdon 8571/APP/2026/1584

Works: Extension Small domestic

Read from the description, not a valuation. How we read the register

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

Proposal

Erection of part double storey, part single storey side/ rear extension

As published by the council, reference 8571/APP/2026/1584

Application record

Reference
8571/APP/2026/1584
Status
Refusal
Received
25 Jun 2026

Site history

Applications at this address on the Hillingdon register

This site has had 4 applications since 2025: 1 approved, 1 refused.

  • 8571/APP/2026/1299 Refused

    101 GROSVENOR CRESCENT HILLINGDON

    Conversion of roof space to habitable use to include a rear dormer, 3 x front roof lights, conversion of roof from hip to gable end, following the partial demolition of existing roof

    Decided 14 Jul 2026 Full applications
  • 8571/APP/2026/856 Decided

    101 GROSVENOR CRESCENT HILLINGDON

    Conversion of roof to habitable space including a rear dormer.

    Submitted 2 Apr 2026
  • 8571/APP/2025/2221 Granted

    101 GROSVENOR CRESCENT HILLINGDON

    Erection of a single storey rear extension, and conversion of garage including replacement of garage door with window.

    Decided 17 Oct 2025 Full applications

Timeline

Dates from the published record

  1. 25 Jun 2026

    Received by Hillingdon

  2. 26 Jul 2026

    Added to PlanIndex

  3. 23 Aug 2026

    Status changed to Refusal

    Previously Undecided.

  4. Decision

    Awaiting decision

    Decision expected by 20 August 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 58 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 58 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.