P2021/1430/COLP

1. 13 May 2021

   Received by Islington

2. 2 Aug 2021

   Decision issued: Approve with no conditions

3. 28 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

• P2021/1583/FUL Granted

  30 Elfort Road, London, N5 1AZ

  Raising of roof ridge height and formation of rear roof terrace on existing outrigger, and associated alterations to dwelling house.

  1 Jun 2021 0m away Householder
• P2026/1783/NMA Awaiting decision

  28 Elfort Road, London, N5 1AZ

  Non-Mateiral Amendment to planning permission ref. P2021/0650/FUL dated 26 Apr 2021 for the Single storey rear extension. Single storey dormer extension to main rear roof and raising the roof ridge level. Installation of balustrades to first and second floor roof terraces. The proposed amendment seeks approval for adjustments to rooflights and rear door of single-storey rear extension

  6 Jul 2026 4m away Amendments
• P2026/1510/FUL Awaiting decision

  Flat A, 110 Highbury Hill, London, N5 1AT

  Erection of a single-storey rear and side ground floor extension; excavation of the existing cellar to create habitable space, including the formation of front and rear lightwells and associated alterations.

  9 Jun 2026 77m away Full applications
• P2026/1590/FUL Awaiting decision

  111, Highbury Hill, London, N5 1TA

  Ground floor rear extension, addition of a terrace to the first floor outrigger roof, addition of a dormer to the main roof including addition of windows and rooflights and replacement windows to front and rear elevations

  17 Jun 2026 106m away Householder
• P2026/0448/FUL Granted

  105 Highbury Hill, London, N5 1TA

  Replacement of single glazed timber windows with double glazed timber windows, to front, side and rear elevations to Flats B & C

  17 Feb 2026 119m away Full applications
• P2026/0622/FUL Granted

  Flat C, 103 Highbury Hill, London, N5 1TA

  Erection of rear dormer roof extension, installation of skylights to front and side roofslopes, and PV solar panels to side roofslope.

  6 Mar 2026 121m away Full applications

• 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