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 43 days over the applications it decided in the last year.

This application is with Barnet for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 19 St Marys Avenue London N3 1SN

  26/0295/HSE Submitted 27 Jan 2026 27m 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 80m 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 89m 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 98m 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)

  Decided Lawful development Extension Loft or dormer +1 9 docs

• 19 Hendon Avenue London N3 1UJ

  26/0097/192 Submitted 12 Jan 2026 101m away

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

  Decided Lawful development Extension Demolition 17 docs

• 19 Hendon Avenue London N3 1UJ

  25/3928/192 Submitted 25 Sep 2025 105m away

  79% historically approved · decision due ~21 Nov

  Single storey side extensions to both sides. Single storey rear extension. Roof extension with rear dormer windows, 14no. front and 2no. side facing rooflights following the demolition of chimneys

  Awaiting decision Lawful development Extension Loft or dormer +2 23 docs
  Small domestic

• 26/3249/HSE Awaiting decision

  19 Rushdene Avenue Barnet EN4 8EN

  New front vehicular access and hardstanding to provide off-street parking space. New retaining wall following demolition of the existing wall and raised planted beds

  7 Sep 2026 Householder
• 26/3235/HSE Awaiting decision

  26 Mount Pleasant Barnet EN4 9HH

  Replace existing flat roof at ground floor rear elevation with pitched roof and 2no. rooflights

  4 Sep 2026 Householder
• 26/3222/HSE Awaiting decision

  46 Michleham Down London N12 7JN

  Single storey side/rear extension with 3no. rooflights following demolition of the existing storage/utility structure. Changes to fenestration

  3 Sep 2026 Householder
• 26/3219/HSE Awaiting decision

  53 Tudor Road Barnet EN5 5NW

  First floor rear extension with front and rear rooflights. Roof extension over existing garage

  2 Sep 2026 Householder
• 26/3210/HSE Awaiting decision

  47 Pattison Road London NW2 2HL

  New front vehicular access to provide off-street parking. Removal of existing gate and shed, alterations to the existing front boundary wall and installation of close board fencing panels.

  2 Sep 2026 Householder