124 Firs Avenue London N11 3NQ

1. 26 Aug 2025

   Received by Barnet

2. 29 Aug 2025

   Decision issued: Lawful

3. 10 Aug 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

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

• 76 Firs Avenue London N11 3NQ

  26/2548/HSE Submitted 7 Jul 2026 32m away

  77% historically approved · decision due ~3 Sep

  Installation of air source heat pump to front elevation

  Awaiting decision Householder
  Domestic

• 6 Winterburn Close London N11 3DJ

  25/3834/HSE Submitted 18 Sep 2025 143m away

  77% historically approved · decision due ~13 Nov

  Two storey rear extension following demolition of the existing conservatory. Single storey front infill extension

  Awaiting decision Householder Extension Demolition 5 docs
  Small domestic

• 6 Winterburn Close London N11 3DJ

  25/4806/HSE Submitted 1 Dec 2025 143m away

  77% historically approved · decision due ~26 Jan

  Single storey front infill extension. Single storey rear extension with 2no. rooflights following demolition of the existing conservatory

  Awaiting decision Householder Extension Loft or dormer +1 5 docs
  Small domestic

• 8A Firs Avenue London N11 3NG

  26/2447/191 Submitted 26 Jun 2026 157m away

  79% historically approved · decision due ~4 Sep

  New side porch and canopy with window

  Awaiting decision Extension Windows or glazing
  Small domestic

• 8A Firs Avenue London N11 3NG

  26/0978/RCU Submitted 16 Mar 2026 198m away

  New side porch and canopy with window (Retrospective Application)

  Refused Amendments Extension Windows or glazing 8 docs
  Small domestic

• 2 Firs Avenue London N11 3NG

  25/4481/HSE Submitted 11 Nov 2025 231m away

  Single storey rear extension to the existing detached garage

  Granted Householder Extension 13 docs
  Small domestic

• 26/1907/191 Decided

  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)

  21 May 2026 Lawful development
• 26/2059/192 Decided

  Low Ridge Rowley Lane Barnet EN5 3HS

  Erection of a rear outbuilding

  3 Jun 2026 Lawful development
• 26/2066/192 Decided

  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)

  3 Jun 2026 Lawful development
• 26/1663/192 Decided

  152 Deans Lane Edgware HA8 9NT

  Change of use from single family dwellinghouse (Class C3a) to supported living accommodation Class C3b)

  5 May 2026 Lawful development
• 26/2025/192 Decided

  18 Hale Drive London NW7 3DU

  Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window

  1 Jun 2026 Lawful development