40-41 Rheidol Mews, London, N1 8NU

1. 18 Feb 2026

   Received by Islington

2. 4 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 1 Jun 2026

   Decision issued: Refusal of permission

4. 25 Jul 2026

   Added to PlanIndex

Islington refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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.

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

  P2026/0468/COL Submitted 18 Feb 2026 50 yards away

  Certificate of Lawfulness (existing) to confirm use of the property as a single

  Refused Lawful development

• 16 - 18 Rheidol Mews, London, N1 8NU

  P2025/2356/COL Submitted 18 Aug 2025 50 yards away

  87% historically approved · decision due ~13 Oct

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

  Awaiting decision Lawful development 4 docs

• 17 Allingham Street, London, N1 8NX

  P2026/1611/FUL Submitted 19 Jun 2026 50 yards away

  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

  Granted Householder Extension Loft or dormer +1 20 docs
  Small domestic

• 31, Allingham Street, London, N1 8NX

  P2026/1116/TRE Submitted 1 May 2026 50 yards away

  Removal of one low hanging branch approx 1 inch in diameter. Tree species: sil

  Granted Trees

• 11 Allingham Street London N1 8NX

  P2026/0207/FUL Submitted 24 Mar 2026 50 yards away

  Replacement of single glazed timber windows with double glazed timber windows, t

  Granted Householder Windows or glazing
  Domestic

• 23 Allingham Street, London, N1 8NX

  P2023/0680/FUL Submitted 9 Mar 2023 50 yards away

  Proposed alterations to existing rear extension including lowering of existing extension walls, amending roof to monopitch traditional lead roof, infilling of existing bathroom window and addition of new rooflight, new tall side window, new door and window to rear of extension and new lead coping to walls of extension.

  Granted Householder Extension Loft or dormer +1 15 docs
  Domestic

• P2026/2548/COL Status unknown

  Flat 5, St Peter's Street Mews, London, N1 8JF

  Certificate of Lawful (Existing) Use for the use of the ground floor property kn

  Received 28 Sep, published by the council 29 Sep 2026 Lawful development
• P2026/2522/COL Status unknown

  Flat 6, 1-2 St Peter's Street Mews, London, N1 8JF

  Certificate of Lawful (Existing) Use for the use of Flat 6 as a self-contained r

  Received 28 Sep, published by the council 29 Sep 2026 Lawful development
• P2026/2549/COL Status unknown

  Flat A, 42 Dartmouth Park Hill, London, NW5 1HN

  Certificate of Lawfulness (Existing) for the conversion of Flat A from a 1-bedro

  Received 25 Sep, published by the council 28 Sep 2026 Lawful development
• P2026/2266/COL Granted

  32 Gillespie Road, London, N5 1LN

  Erection of rear dormer roof extensions to main and outrigger roofs, installatio

  Received 27 Aug, published by the council 2 Sep 2026 Lawful development
• P2026/2525/COL Status unknown

  10A Rock Street, London, N4 2DN

  Certificate of Lawfulness (Proposed) for use of the site as a 5-person small-sca

  Received 24 Sep, published by the council 25 Sep 2026 Lawful development