40, Seymour Avenue, London, N17 9EB

1. 15 Jul 2021

   Received by Haringey

2. 23 Aug 2021

   Decision issued: Permitted Development

3. 31 Aug 2026

   Added to PlanIndex

Haringey granted permission on 23 August 2021, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 1 Thackeray Avenue, Tottenham, London, N17 9DT

  HGY/2026/0986 Submitted 7 Apr 2026 25m away

  Certificate of lawfulness for the erection of a rear dormer and roof extension including the insertion of 2x front and 1x rear rooflights - proposed use

  Granted Lawful development Extension Loft or dormer 6 docs

• 49 Thackeray Avenue, Tottenham, London, N17 9DT

  HGY/2026/1063 Submitted 15 Apr 2026 25m away

  Certificate of lawfulness (proposed) for the erection of a rear dormer and roof extension including the insertion of 2x front and 1x rear rooflight

  Granted Lawful development Extension Loft or dormer 8 docs

• 37, Thackeray Avenue, London, N17 9DT

  HGY/2021/2412 Submitted 1 Sep 2021 25m away

  Certificate of lawfulness: Loft and ground floor infill extension at rear with 2 roof windows at the front

  Decided Lawful development Extension Windows or glazing 14 docs

• 20, Sherringham Avenue, London, N17 9RN

  HGY/2021/1890 Submitted 29 Jun 2021 72m away

  Erection of a single storey extension which extends beyond the rear wall of the original house by 6m, for which the maximum height would be 2.99m and for which the height of the eaves would be 2.99m

  Decided Prior approval Extension 10 docs
  Small domestic

• 57 Dowsett Road, Tottenham, London, N17 9DL

  HGY/2024/2893 Submitted 21 Oct 2024 81m away

  Change of use from D1 surgery to its previous use C3 dwellinghouse

  Granted Full applications 13 docs
  Domestic

• 1 Rosebery Avenue, Tottenham, London, N17 9RY

  HGY/2026/1587 Submitted 16 Jun 2026 146m away

  83% historically approved · decision due ~11 Aug

  Change of Use from 3 bed single dwelling (use class C3) to 3 bed house of Multiple Occupation (HMO - Use Class C4) for a maximum of 3 occupants.

  Awaiting decision Full applications 5 docs
  Domestic

• HGY/2026/1951 Granted

  105 Alexandra Road, Wood Green, London, N8 0LG

  Certificate of Lawfulness (existing) for continued use of property as two flats (C3)

  10 Jul 2026 Lawful development
• HGY/2026/2416 Awaiting decision

  Vincent House, 1A Vincent Road, Tottenham, London, N15 3QA

  Certificate of Lawfulness: Existing use of the property as six self-contained flats.

  4 Sep 2026 Lawful development
• HGY/2026/2154 Awaiting decision

  86 Palmerston Road, Wood Green, London, N22 8RF

  Certificate of Lawfulness Existing: Property was converted from a single dwelling house into 3no. self-contained flats in May 2010.

  2 Sep 2026 Lawful development
• HGY/2026/2107 Awaiting decision

  83 Lancaster Road, Hornsey, London, N4 4PL

  Certificate of lawfulness (proposed): rear roof terrace.

  2 Sep 2026 Lawful development
• HGY/2026/2354 Awaiting decision

  118 Philip Lane, Tottenham, London, N15 4JL

  Lawful development: Existing use of first and loft floor levels of No. 118 Philip Lane as two self-contained C3 residential units.

  1 Sep 2026 Lawful development