25 Gresham Avenue London N20 0XJ

1. 8 Sep 2025

   Received by Barnet

2. 10 Aug 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 3 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 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

• 24 Gresham Avenue London N20 0XL

  26/0725/192 Submitted 25 Feb 2026 80m away

  79% historically approved · decision due ~22 Apr

  Erection of a rear outbuilding

  Awaiting decision Lawful development 4 docs

• 4 Friars Avenue London N20 0XH

  26/2125/HSE Submitted 8 Jun 2026 99m away

  77% historically approved · decision due ~19 Aug

  Alterations to roof involving addition of a front dormer window. Replacement of existing rear fenestration with bi-folding doors and a window. Partial conversion of garage into habitable room. (amended description and updated drawings)

  Awaiting decision Householder Loft or dormer Windows or glazing 11 docs
  Domestic

• 24 Gresham Avenue London N20 0XL

  26/2265/HSE Submitted 17 Jun 2026 105m away

  77% historically approved · decision due ~8 Sep

  Two storey side extension, single storey rear extension and extension and lowering of existing basement. New raised rear terrace, alterations to boundary treatment including privacy screening with associated hard and soft landscaping

  Awaiting decision Householder Extension
  Small domestic

• 91 Manor Drive London N20 0XD

  26/1294/HSE Submitted 7 Apr 2026 115m away

  77% historically approved · decision due ~2 Jun

  Single storey rear extension with 4no. rooflights following demolition of the existing bay window (AMENDED DESCRIPTION)

  Awaiting decision Householder Extension Loft or dormer +2 4 docs
  Small domestic

• 11A Friars Avenue London N20 0XE

  26/2792/HSE Submitted 29 Jul 2026 127m away

  77% historically approved · decision due ~23 Sep

  Conversion of the existing garage into habitable room and incorporation into the main dwelling, including replacement of the garage door with arched window and associated alterations to the side and rear elevations

  Awaiting decision Householder Windows or glazing
  Domestic

• 27 Friars Avenue London N20 0XE

  26/2233/192 Submitted 15 Jun 2026 180m away

  Single storey rear extension with 2no. rooflights following partial demolition of the existing rear extension (amended)

  Decided Lawful development Extension Loft or dormer +1 9 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