First And Second Floor Maisonette 103 Colney Hatch Lane London N10 1LR

1. 30 Jan 2026

   Received by Barnet

2. 5 Feb 2026

   Validated

   Checked as complete and ready for consideration.

3. 10 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 2 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

• 85 Colney Hatch Lane London N10 1LR

  26/2591/FUL Submitted 10 Jul 2026 73m away

  60% historically approved · decision due ~14 Sep

  Roof extension involving rear dormer window and 2no. front facing rooflights

  Awaiting decision Full applications Extension Loft or dormer +1

• The Minstrel Boy 156 Colney Hatch Lane London N10 1ET

  24/1701/191 Submitted 29 Apr 2024 74m away

  Use as 7no. Studio flats (Amended Description)

  Decided Lawful development New dwelling 47 docs

• 6 Halliwick Road London N10 1AB

  26/0522/192 Submitted 10 Feb 2026 83m away

  Roof extension involving rear dormer window and 3no. front facing rooflights. Increase in height to vent pipe on rear elevation

  Decided Lawful development Extension Loft or dormer +1 20 docs

• 11 Halliwick Road London N10 1AA

  25/3931/HSE Submitted 25 Sep 2025 131m away

  77% historically approved · decision due ~20 Nov

  Single storey side/rear infill extension with 4no. side rooflights and alterations to existing patio/decking area levels

  Awaiting decision Householder Extension Loft or dormer 15 docs
  Small domestic

• 25 Wilton Road London N10 1LX

  25/3597/192 Submitted 1 Sep 2025 131m away

  Roof extension including rear dormer window to main roof and rear outrigger, 1no. front facing rooflight and new side gable window

  Decided Lawful development Extension Loft or dormer +1 8 docs

• 25 Wilton Road London N10 1LX

  25/3596/HSE Submitted 1 Sep 2025 131m away

  Single storey side/rear infill extension with glazed roof

  Granted Householder Extension Windows or glazing 11 docs
  Small domestic

• 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