12 Marlborough Avenue Edgware HA8 8UH

1. 18 Feb 2026

   Received by Barnet

2. 10 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 15 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 42 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

• 12 Marlborough Avenue Edgware HA8 8UH

  25/4255/HSE Submitted 24 Oct 2025 0m away

  Front porch extension including the relocation of the front door and new access steps. First floor side extension and alterations to the existing roof

  Granted Householder Extension 6 docs
  Small domestic

• 12 Marlborough Avenue Edgware HA8 8UH

  26/2009/192 Submitted 29 May 2026 0m away

  79% historically approved · decision due ~24 Jul

  Removal and alteration of existing roof above existing two storey side (Phase 1). Roof extension involving wraparound side and rear dormer windows (Phase 2). (Phase 2 to commence when phase 1 completed)

  Awaiting decision Lawful development Extension Loft or dormer +1 5 docs

• 12 Marlborough Avenue Edgware HA8 8UH

  25/4254/PNH Submitted 24 Oct 2025 5m away

  Single storey rear extension with a proposed depth of 6.00m, maximum height of 3.00m and eaves height of 2.70m

  Granted Prior approval Extension 6 docs
  Small domestic

• 12 Marlborough Avenue Edgware HA8 8UH

  26/3039/HSE Submitted 18 Aug 2026 27m away

  77% historically approved · decision due ~14 Oct

  Part single, part two storey rear extension. First floor side extension. Roof extension involving side and rear wraparound dormer and side gable windows. New front porch with associated steps and railings

  Awaiting decision Householder Extension Loft or dormer +1
  Small domestic

• 47 Warwick Avenue Edgware HA8 8UN

  25/4472/HSE Submitted 10 Nov 2025 38m away

  77% historically approved · decision due ~13 Jan

  Part single part two storey side and rear extensions following demolition of the existing garage. Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights. New front porch

  Awaiting decision Householder Extension Loft or dormer +2 8 docs
  Small domestic

• 41 Warwick Avenue Edgware HA8 8UN

  26/2008/HSE Submitted 29 May 2026 47m away

  Part single, part two storey front, side and rear extensions with new raised rear terrace with access steps following demolition of the existing detached side garage and shed

  Granted Householder Extension Demolition 10 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