66 Rosemary Avenue London N3 2QN

1. 12 May 2026

   Received by Barnet

2. 13 May 2026

   Validated

   Checked as complete and ready for consideration.

3. 25 Jul 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 8 July 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   Barnet took a median of 44 days over the applications it decided in the last year.

This application is with Barnet for determination, against a statutory target of eight weeks. Over the last year Barnet decided lawful development applications in a median of 28 days. More in our guide to how long planning decisions take.

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.

• 54 Rosemary Avenue London N3 2QN

  21/5566/PNH Submitted 20 Oct 2021 0.1 miles away

  Proposed single-storey rear extension with a proposed depth of 5 metres, eaves height of 3 metres and maximum height of 4 metres.

  Refused Prior approval Extension 5 docs
  Small domestic

• 48 Rosemary Avenue London N3 2QN

  26/0704/192 Submitted 23 Feb 2026 0.1 miles away

  Roof extension involving hip to gable, rear dormer window, 2no front facing rooflights. Removal of chimney (AMENDED DESCRIPTION)

  Granted Lawful development Extension Loft or dormer +1 7 docs

• Land To The Rear Of 14 And 23 Tangle Tree Close London N3 2TR

  25/3663/OUT Submitted 5 Sep 2025 0.1 miles away

  79% historically approved · decision due ~31 Oct

  Outline application for the erection of a 53-bedroom care home Class C2 with all matters reserved

  Awaiting decision Outline 11 docs

• 43 Briarfield Avenue London N3 2LG

  25/3946/HSE Submitted 29 Sep 2025 0.1 miles away

  77% historically approved · decision due ~24 Nov

  Single storey rear extension with 2no. rooflights

  Awaiting decision Householder Extension Loft or dormer 11 docs
  Small domestic

• 1 Rosemary Avenue London N3 2QP

  26/0517/NMA Submitted 10 Feb 2026 0.1 miles away

  69% historically approved · decision due ~7 Apr

  Non material amendment to planning permission 25/2642/HSE dated 30/07/2025 for `Single storey rear extension with 2no. rooflights, following demolition of existing sunroom and rear outrigger.` Amendment includes addition of 2no. side windows

  Awaiting decision Amendments Extension Loft or dormer +2 3 docs
  Small domestic

• 13 Briar Close London N2 0RS

  25/3549/FUL Submitted 27 Aug 2025 0.1 miles away

  61% historically approved · decision due ~22 Oct

  Installation of access ramps to front and rear of property with associated handrails and alterations to front and rear doors

  Awaiting decision Full applications 4 docs

• 26/2679/192 Granted

  21 Myddelton Park London N20 0JH

  Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).

  Received 20 Jul, published by the council 7 Aug 2026 Lawful development
• 26/1907/191 Granted

  8 Golders Manor Drive London NW11 9HT

  Use of the property as a self-contained residential unit at ground floor level and the first and second floors as a 4-bedroom, 4-person House in Multiple Occupation (Sui Generis) (AMENDED DESCRIPTION)

  Received 21 May, published by the council 16 Aug 2026 Lawful development
• 26/2059/192 Refused

  Low Ridge Rowley Lane Barnet EN5 3HS

  Erection of a rear outbuilding

  Received 3 Jun, published by the council 16 Aug 2026 Lawful development
• 26/2066/192 Granted

  355 Hendon Way London NW4 3NB

  Roof extension involving rear dormer window and 3no. front facing rooflights. Removal of chimney on rear elevation (AMENDED DESCRIPTION)

  Received 3 Jun, published by the council 16 Aug 2026 Lawful development
• 26/2525/192 Granted

  39 Ridgeway Avenue Barnet EN4 8TN

  Single storey rear extension

  Received 6 Jul, published by the council 9 Aug 2026 Lawful development