23 St Marys Avenue London N3 1SN

1. 4 Sep 2025

   Received by Barnet

2. 12 Sep 2025

   Validated

   Checked as complete and ready for consideration.

3. 10 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 7 November 2025, 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 46 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 householder applications in a median of 56 days. More in our guide to how long planning decisions take.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 19 St Marys Avenue London N3 1SN

  26/0295/HSE Submitted 27 Jan 2026 50 yards away

  Single storey rear extension. Rear Patio. Roof extension including hip to gable and rear dormer window. Alterations to front elevation involving changes to fenestration and external material finishes

  Granted Householder Extension Loft or dormer +1 28 docs
  Small domestic

• 23 Cyprus Gardens London N3 1SP

  26/2179/HSE Submitted 11 Jun 2026 100 yards away

  77% historically approved · decision due ~6 Aug

  Single storey side and rear extension. Conversion of garage into storage/utility room including raising of parapet wall

  Decided Householder Extension
  Small domestic

• 11 Cyprus Gardens London N3 1SP

  26/0609/CON Submitted 17 Feb 2026 100 yards away

  Submission of details of condition 6 (Privacy Screen) pursuant to planning permission 25/1148/HSE dated 24/04/2025

  Granted Conditions 6 docs

• 23 Cyprus Gardens London N3 1SP

  26/1920/192 Submitted 21 May 2026 100 yards away

  Roof extension involving hip to gable, rear dormer window with juliette balcony, 2no. front facing rooflights and new side gable window, following removal of existing side and rear dormer windows, and partial removal of the chimney on the flank wall. (amended)

  Granted Lawful development Extension Loft or dormer +1 9 docs

• 19 Hendon Avenue London N3 1UJ

  26/0097/192 Submitted 12 Jan 2026 100 yards away

  Extension of existing swimming pool and new pool house following demolition of existing pool house

  Refused Lawful development Extension Demolition 17 docs

• 19 Hendon Avenue London N3 1UJ

  26/2094/192 Submitted 5 Jun 2026 100 yards away

  Demolition of existing pool house and erection of a new extended pool house with same pool size.

  Refused Lawful development Demolition 19 docs

• 26/3853/HSE Awaiting decision

  30 Goldsmith Avenue London NW9 7HB

  Single storey rear extension following demolition of the existing extension

  23 Oct 2026 Householder
• 26/3856/HSE Awaiting decision

  229 Hale Drive London NW7 3EH

  Single storey rear extension

  23 Oct 2026 Householder
• 26/3827/HSE Awaiting decision

  43 Hermitage Lane London NW2 2HE

  Single storey rear extension with 3no. rooflights following demolition of the existing conservatory. Replacement front bay window and entrance porch. First floor rear juliette balcony. Changes to fenestration including new window openings and enlarged front rooflight

  22 Oct 2026 Householder
• 26/3833/HSE Awaiting decision

  47 Holne Chase London N2 0QG

  Single storey rear extension. Replacement of single glazed windows with double glazing. Alterations to side/rear fenestration. Alterations and replacement of existing rear dormer window addition of 2no. side dormer windows and 3no. rooflights. Installation of cameras and wall lights. Replacement of the front entrance and garage doors, installation of timber side garden gates

  22 Oct 2026 Householder
• 26/3841/HSE Awaiting decision

  Manor House West Heath Close London NW3 7NJ

  New metal framed pergola to upper ground floor rear terrace

  Received 22 Oct, published by the council 23 Oct 2026 Householder