P2023/0203/COLP

1. 20 Jan 2023

   Received by Islington

2. 15 Mar 2023

   Decision issued: Approve with no conditions

3. 25 Jul 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 lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• P2025/2581/S73 Awaiting decision

  47 Corbyn Street, London, N4 3BY

  Section 73 Application (Minor Material Amendment) to vary Condition 2 (Approved Plans) of Planning Permission P2023/0348/FUL for erection of mansard roof extension to facilitate loft conversion. The amendments sought are to alter the rear window and rooflight arrangements, chimney and SVP extensions.

  11 Sep 2025 29m away Amendments
• P2023/0348/FUL Granted

  47 Corbyn Street, London, N4 3BY

  Erection of mansard roof extension to facilitate loft conversion

  1 Feb 2023 29m away Householder
• P2023/0317/COLP Granted

  24 Corbyn Street, London, N4 3BZ

  Certificate of Lawfulness (Proposed) for erection of rear dormer roof extension to existing outrigger

  30 Jan 2023 58m away Lawful development
• P2023/0206/COLP Granted

  18 Corbyn Street, London, N4 3BZ

  Certificate of lawfulness (proposed) associated with the erection of a single-storey extension to main roof and above the outrigger.

  20 Jan 2023 73m away Lawful development
• P2026/0404/FUL Granted

  14 Corbyn Street, London, N4 3BZ

  Mansard roof extension and outrigger roof extension

  13 Feb 2026 83m away Householder
• P2021/1831/PRA Granted

  14 Corbyn Street, London, N4 3BZ,

  Notification for Prior Approval (Householder) for demolition of the existing extensions and outbuildings to the original house and construction of a new single-storey side infill extension.

  22 Jun 2021 83m away Prior approval

• P2026/1005/COL Granted

  505A Hornsey Road, London

  Certificate of Lawfulness (Existing) for the use of the first, second and third floors as a 6-room large HMO (Use Class Sui Generis)

  15 Apr 2026 Lawful development
• P2026/1434/COL Granted

  9 Alwyne Square, London, N1 2JX

  Installation of 3 rooflights in the rear roof slope.

  3 Jun 2026 Lawful development
• P2026/0980/COL Granted

  4A Cowcross Street, London, EC1M 6DR

  Certificate of Lawful (Existing) development for the use of the first, second and third floors as three self-contained studio flats (Class C3)

  14 Apr 2026 Lawful development
• P2026/1324/COL Granted

  Gough House, 1 Windsor Street, London, N1 8QA

  Certificate of Lawfulness (proposed) for the installation of low-level play equipment, seating, planter with trellis, grass matting and a self-closing child-safety gate fixed to existing metal hoop-top fencing.

  21 May 2026 Lawful development
• P2026/1943/COL Awaiting decision

  49, Linton Street, London, N1 7AN

  Certificate of Lawfulness (Proposed) for the construction of a garden studio/outbuilding in rear garden.

  21 Jul 2026 Lawful development