42 Haslemere Avenue Barnet EN4 8EZ

1. 4 Dec 2025

   Received by Barnet

2. 5 Dec 2025

   Validated

   Checked as complete and ready for consideration.

3. 10 Aug 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 30 January 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

• 42 Haslemere Avenue Barnet EN4 8EZ

  25/4855/HSE Submitted 4 Dec 2025 0m away

  77% historically approved · decision due ~29 Jan

  Single storey front extension including new porch. Single storey rear extension with new terrace area and access steps. Part single, part two storey side extension

  Awaiting decision Householder Extension 8 docs
  Small domestic

• 46 Haslemere Avenue Barnet EN4 8EZ

  26/1153/192 Submitted 26 Mar 2026 19m away

  79% historically approved · decision due ~22 May

  Roof extension involving hip to gable, replacement rear dormer window with juliette balcony and new side gable window

  Awaiting decision Lawful development Extension Loft or dormer +1 10 docs

• 46 Haslemere Avenue Barnet EN4 8EZ

  26/1165/HSE Submitted 26 Mar 2026 19m away

  77% historically approved · decision due ~22 May

  Single storey rear extension with extended raised patio area with glass balustrade and external steps. Part conversion of the existing garage into a habitable room, including alterations to roof

  Awaiting decision Householder Extension 11 docs
  Small domestic

• 32 Haslemere Avenue Barnet EN4 8EZ

  26/1095/HSE Submitted 23 Mar 2026 50m away

  77% historically approved · decision due ~27 May

  Single storey front porch and rear extenision with access steps and patio area. Conversion of the existing garage into habitable room with new pitch roof and insertion of window to replace garage door

  Awaiting decision Householder Extension Windows or glazing 8 docs
  Small domestic

• 32 Haslemere Avenue Barnet EN4 8EZ

  25/5105/PNH Submitted 18 Dec 2025 50m away

  58% historically approved · decision due ~13 Feb

  Single-storey rear extension measuring a maximum 6.0m in depth from rear wall, 3.85m maximum height and eaves height

  Awaiting decision Prior approval Extension 9 docs
  Small domestic

• 32 Haslemere Avenue Barnet EN4 8EZ

  26/2512/192 Submitted 3 Jul 2026 82m away

  79% historically approved · decision due ~28 Aug

  Roof extension involving hip to gable, rear dormer window, 3no. front-facing rooflights and new side gable window following the removal of the chimney. Erection of a rear outbuilding. (Amended Description)

  Awaiting decision Extension Loft or dormer +1

• 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