40 Westbury Road London N12 7PD

1. 10 Feb 2026

   Received by Barnet

2. 10 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 7 April 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 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.

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

• 40 Westbury Road London N12 7PD

  25/4847/192 Submitted 3 Dec 2025 0m away

  79% historically approved · decision due ~29 Jan

  Roof extension involving rear dormer window and 3no. front facing rooflights

  Awaiting decision Lawful development Extension Loft or dormer +1 7 docs

• 40 Westbury Road London N12 7PD

  26/0584/192 Submitted 16 Feb 2026 11m away

  Roof extension involving rear dormer window and 3no. front facing rooflights

  Decided Lawful development Extension Loft or dormer +1 7 docs

• 1 Argyle Road London N12 7NU

  26/1675/RCU Submitted 5 May 2026 50m away

  71% historically approved · decision due ~1 Jul

  Installation of football goal net with floodlights, boundary netting and supports (Retrospective Application)

  Awaiting decision Amendments 6 docs

• Brook Lodge 7A Argyle Road London N12 7HS

  21/5354/192 Submitted 8 Oct 2021 100m away

  Single storey side extension

  Decided Lawful development Extension 11 docs
  Small domestic

• 65 Westbury Road London N12 7PB

  26/2670/HSE Submitted 17 Jul 2026 127m away

  77% historically approved · decision due ~11 Sep

  Erection of a rear outbuilding following demolition of the existing outbuilding

  Awaiting decision Householder Demolition
  Small domestic

• 57 Westbury Road London N12 7PB

  26/2402/192 Submitted 24 Jun 2026 127m away

  79% historically approved · decision due ~20 Aug

  Changes to fenestration including insertion of 3no. new windows to north elevation, 1no. new window to south elevation. 2no. new windows to rear elevation, alterations to front elevation: front door, rooflights and windows

  Awaiting decision Loft or dormer Windows or glazing

• 26/2679/192 Decided

  21 Myddelton Park London N20 0JH

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

  20 Jul 2026 Lawful development
• 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