21 ADELPHI CRESCENT HAYES UB4 8LZ

1. 28 Jan 2026

   Received by Hillingdon

2. 12 Feb 2026

   Decision issued: Permitted

3. 12 Aug 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.

More on full applications applications in our guide

• 19 ADELPHI CRESCENT HAYES UB4 8LZ

  74902/APP/2019/3302 Submitted 9 Oct 2019 0m away

  Single storey rear extension and conversion of roof space to habitable use to include a rear dormer, 2 front rooflights and conversion of roof from hip to gable end (Application for a Certificate of Lawful Development for a Proposed Development)

  Granted Full applications Extension Loft or dormer 11 docs
  Small domestic

• 18 ADELPHI CRESCENT HAYES UB4 8LZ

  72688/APP/2025/2960 Submitted 24 Nov 2025 0m away

  Conversion of a single dwelling house into 2no. self contained Flats.

  Refused Full applications New dwelling 21 docs
  Domestic

• 21 ADELPHI CRESCENT HAYES UB4 8LZ

  78333/APP/2025/2994 Submitted 26 Nov 2025 0m away

  86% historically approved · decision due ~21 Jan

  Non-material amendment to planning permission ref. 78333/APP/2024/723, dated 05-06-24 (Erection of a single storey detached building to the rear for use as a residential annexe) to increase the size and number of outbuilding windows

  Awaiting decision Windows or glazing
  Small domestic

• 85 ADELPHI CRESCENT HAYES UB4 8NB

  79531/APP/2025/2248 Submitted 20 Aug 2025 101m away

  86% historically approved · decision due ~15 Oct

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

  Awaiting decision Extension Loft or dormer +1

• 17 DORSET AVENUE HAYES UB4 8NR

  79813/APP/2025/3031 Submitted 2 Dec 2025 106m away

  Conversion of roof space to habitable use to include a rear dormer, Hip to gable extension, 3x front roof lights, and erection of outbuilding to rear garden (Application for a Certificate of Lawful Development for a Proposed Development).

  Granted Full applications Extension Loft or dormer 5 docs

• 17 DORSET AVENUE HAYES UB4 8NR

  79813/APP/2025/3032 Submitted 2 Dec 2025 106m away

  Erection of front porch, and part single storey part double storey rear extension.

  Granted Full applications Extension 6 docs
  Small domestic

• 80149/APP/2026/1572 Granted

  14 LADYGATE LANE RUISLIP HA4 7QU

  Erection of single storey side and rear wraparound extension, a front porch, amendments to fenestration and roof lights to the front, side and rear sloped roof, following the removal of the rear chimney and garden shed. (Description Amended)

  24 Jun 2026 Full applications
• 79879/APP/2026/1749 Granted

  21 NORTH AVENUE HAYES UB3 2JE

  Erection of part single storey, part double storey rear extension

  13 Jul 2026 Full applications
• 74889/APP/2026/1363 Granted

  32 MANOR ROAD HAYES UB3 2DG

  Erection of a first-floor rear extension.

  1 Jun 2026 Full applications
• 53073/APP/2026/1645 Granted

  50 MINET DRIVE HAYES UB3 3JW

  Erection of a part single storey, part two storey extension to the rear

  1 Jul 2026 Full applications
• 80172/APP/2026/1717 Refused

  6 SQUIRRELS TRADING ESTATE VIVEASH CLOSE HAYES UB3 4RZ

  Change of use from Class B8 to Class E retail

  8 Jul 2026 Full applications