26 Onslow Gardens, Hornsey, London, N10 3JU

This site has had 2 applications since 2026: 1 approved, 0 refused.

• HGY/2026/1715 Granted

  26 Onslow Gardens, Hornsey, London, N10 3JU

  Certificate of Lawfulness for the proposed erection of a dormer extension to the rear and the installation of two rooflights on the front roof slope.

  Decided 11 Aug 2026 Lawful development

1. 24 Jun 2026

   Received by Haringey

2. 24 Jul 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 19 August 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Haringey took a median of 53 days over the applications it decided in the last year.

This application is with Haringey for determination, against a statutory target of eight weeks. Over the last year Haringey decided householder applications in a median of 56 days. More in our guide to how long planning decisions take.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 26 Onslow Gardens, Hornsey, London, N10 3JU

  HGY/2026/1715 Submitted 16 Jun 2026 0m away

  Certificate of Lawfulness for the proposed erection of a dormer extension to the rear and the installation of two rooflights on the front roof slope.

  Granted Lawful development Extension Loft or dormer 18 docs

• 24 Onslow Gardens, Hornsey, London, N10 3JU

  HGY/2026/1408 Submitted 19 May 2026 0m away

  Enlargement of existing rear dormer and installation of a front dormer window.

  Granted Householder Loft or dormer Windows or glazing 10 docs
  Domestic

• 24 Onslow Gardens, Hornsey, London, N10 3JU

  HGY/2026/1679 Submitted 15 Jun 2026 0m away

  Erection of a single storey rear and side extension and installation of rear rooflights to infill extension. (AMENDED DESCRIPTION)

  Granted Householder Extension Loft or dormer 7 docs
  Small domestic

• 24 Onslow Gardens, Hornsey, London, N10 3JU

  HGY/2026/0940 Submitted 1 Apr 2026 0m away

  Certificate of lawfulness for the proposed erection of a rear dormer.

  Granted Lawful development Loft or dormer 5 docs

• 20, Onslow Gardens, London, N10 3JU

  HGY/2021/2396 Submitted 16 Aug 2021 11m away

  Non-material amendment following a grant of planning permission HGY/2021/1113 involving the retention of existing wall to allow for a bin store area

  Granted Amendments 4 docs

• 13 Onslow Gardens, Hornsey, London, N10 3JT

  HGY/2023/0540 Submitted 22 Feb 2023 41m away

  Construction of an outbuilding

  Granted Householder 9 docs
  Small domestic

• HGY/2026/2282 Awaiting decision

  77 Falkland Road, Hornsey, London, N8 0NS

  Single storey side and rear extension.

  14 Sep 2026 Householder
• HGY/2026/2059 Granted

  21 Shanklin Road, Hornsey, London, N8 8TJ

  Single Storey Rear Extension

  20 Jul 2026 Householder
• HGY/2026/2162 Granted

  71 Fairfax Road, Hornsey, London, N8 0NH

  Erection of L-shaped rear dormer; erection of single storey rear extension; 2 no. front roof lights.

  30 Jul 2026 Householder
• HGY/2026/1895 Granted

  396 St Anns Road, Tottenham, London, N15 3ST

  Erection of single storey side infill extension, formation of dormer window and insertion of 4 nos. rooflights (3no. front facing and 1no. rear facing).

  17 Jul 2026 Householder
• HGY/2026/1959 Granted

  10 Roseberry Gardens, Tottenham, London, N4 1JJ

  Erection of a single storey rear and side wraparound extension, formation of dormer window and insertion of 3 nos. rooflights to front roof slope (amended).

  17 Jul 2026 Householder