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 50 yards 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 50 yards 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 50 yards away

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

  Refused Lawful development Extension Windows or glazing 14 docs

• 37, Seymour Avenue, London, N17 9RE

  HGY/2021/2647 Submitted 25 Aug 2021 50 yards away

  Certificate of lawfulness: proposed use Rear L-shaped dormer with roof lights on front slope

  Granted Lawful development Loft or dormer 12 docs

• 12 Thackeray Avenue, Tottenham, London, N17 9DY

  HGY/2023/0742 Submitted 16 Mar 2023 50 yards away

  Certificate of Lawfulness for proposed single storey rear extension (following a determination under application reference HGY/2022/0222 that Prior Approval Not Required for a larger single storey rear extension).

  Granted Lawful development Extension 8 docs
  Small domestic

• 20, Sherringham Avenue, London, N17 9RN

  HGY/2021/1890 Submitted 29 Jun 2021 100 yards 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

• HGY/2026/2285 Granted

  13 Woollaston Road, Hornsey, London, N4 1SD

  Certificate of Lawfulness (proposed) for loft conversion with rear dormer extension.

  Received 14 Aug, published by the council 22 Aug 2026 Lawful development
• HGY/2026/2357 Granted

  40 Falmer Road, Tottenham, London, N15 5BA

  Lawful development Certification for proposed erection of rear roof extension and insertion of front rooflight

  Received 21 Aug, published by the council 4 Oct 2026 Lawful development
• HGY/2026/2692 Granted

  125 High Cross Road, Tottenham, London, N17 9NR

  Lawful development: Proposed use for change of use within Class E to a Nail shop (Class E(c)(iii))

  Received 29 Sep, published by the council 4 Oct 2026 Lawful development
• HGY/2026/2637 Granted

  30 Gloucester Road, Tottenham, London, N17 6DH

  Lawful development: Proposed use. Loft conversion including 2x roof lights and L-shaped box dormer to the rear roof slopes with materials to match existing materials on main roof

  Received 21 Sep, published by the council 4 Oct 2026 Lawful development
• HGY/2026/2420 Granted

  50 St Loys Road, Tottenham, London, N17 6UD

  Certificate of Lawfulness: Proposed erection of an L-shaped rear dormer including the insertion of 2nos. front rooflights.

  Received 28 Aug, published by the council 7 Sep 2026 Lawful development