P2026/0467/COL

1. 18 Feb 2026

   Received by Islington

2. 13 Apr 2026

   Decision issued: Refusal of permission

3. 25 Jul 2026

   Added to PlanIndex

The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.

Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.

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

• P2026/0468/COL Refused

  42 - 43, Rheidol Mews, London, N1 8NU

  Certificate of Lawfulness (existing) to confirm use of the property as a single dwellinghouse (Use Class C3) for a period of 4 years or more

  18 Feb 2026 2m away Lawful development
• P2025/2356/COL Awaiting decision

  16 - 18 Rheidol Mews, London, N1 8NU

  Certificate of Lawfulness (existing) to confirm the use of various units within the terrace as Use Class E

  18 Aug 2025 9m away Lawful development
• P2026/1086/NMA Decided

  8 Rheidol Terrace, London, N1 8NT

  Non-material amendment to planning permission ref. P2023/1394/FUL dated 25/07/2023 for: Alterations to the existing lower ground and ground floor extensions, including the installation of new bi-fold doors and windows; an increase in height of the ground and lower ground floor extensions; and the formation of a terrace above the lower ground floor extension, with associated metal balustrades and access door. The proposed amendment seeks approval for a increase of 100mm to the approved parapet height.

  24 Apr 2026 18m away Amendments
• P2026/1457/FUL Awaiting decision

  8 Rheidol Terrace, London, N1 8NT

  Retrospective application for material amendments to planning permission ref. P2023/1394/FUL, comprising a 100mm increase in the approved parapet height of the rear extension, the addition of coping stones, revisions to the fascia treatment including the use of brick slips, and the omission of the approved rooflight/second study window.

  5 Jun 2026 18m away Householder
• P2026/1611/FUL Awaiting decision

  17 Allingham Street, London, N1 8NX

  Erection of a single-storey rear infill extension at lower ground level, a part-width rear extension at upper ground level, and a mansard roof extension. Works include raising cill of upper ground rear window

  19 Jun 2026 21m away Householder
• P2026/0207/FUL Granted

  11 Allingham Street London N1 8NX

  Replacement of single glazed timber windows with double glazed timber windows, to front and rear elevation

  28 Jan 2026 27m away Householder

• 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