4 Derwent Avenue Barnet EN4 8LX

1. 14 May 2026

   Received by Barnet

2. 20 May 2026

   Validated

   Checked as complete and ready for consideration.

3. 9 Jun 2026

   Decision issued: Lawful

4. 16 Aug 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

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

• 1 Derwent Avenue Barnet EN4 8LU

  26/2247/192 Submitted 16 Jun 2026 45m away

  Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window

  Decided Lawful development Extension Loft or dormer +1 8 docs

• 20 Derwent Avenue Barnet EN4 8LX

  25/4929/192 Submitted 9 Dec 2025 56m away

  Roof extension involving rear dormer window with juliette balcony

  Decided Lawful development Extension Loft or dormer +1 10 docs

• 20 Derwent Avenue Barnet EN4 8LX

  26/2836/192 Submitted 31 Jul 2026 76m away

  79% historically approved · decision due ~25 Sep

  Roof extension involving rear dormer window with juliette balcony

  Awaiting decision Extension Loft or dormer +1

• Land Side Of The Rectory 136 Church Hill Road East Barnet EN4 8XD

  24/1754/PNT Submitted 3 May 2024 190m away

  Installation of a 17.38 metre high monopole supporting 6no. antennas and a 300mm transmission dish. Installation of 3no. equipment cabinets and ancillary development thereto

  Refused Telecoms 17 docs

• 32 Haslemere Avenue Barnet EN4 8EZ

  26/1095/HSE Submitted 23 Mar 2026 197m 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 197m 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

• 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