20 Derwent Avenue Barnet EN4 8LX

This site has had 2 applications since 2025: 0 approved, 1 refused.

• 25/4929/192 Refused

  20 Derwent Avenue Barnet EN4 8LX

  Roof extension involving rear dormer window with juliette balcony

  Decided 30 Dec 2025 Lawful development

1. 31 Jul 2026

   Received by Barnet

2. 3 Aug 2026

   Added to PlanIndex

3. 7 Aug 2026

   Status changed to Lawful

   Previously Pending Consideration.

4. Decision

   Awaiting decision

   Decision expected by 25 September 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, against a statutory target of eight weeks. Over the last year Barnet's median decision took 43 days. More in our guide to how long planning decisions take.

The published feed does not state which type of application this is; the register entry on Barnet's portal will say. Our guide explains the common types.

• 20 Derwent Avenue Barnet EN4 8LX

  25/4929/192 Submitted 9 Dec 2025 20m away

  Roof extension involving rear dormer window with juliette balcony

  Refused Lawful development Extension Loft or dormer +1 10 docs

• 4 Derwent Avenue Barnet EN4 8LX

  26/1823/192 Submitted 14 May 2026 76m away

  Roof extension involving hip to gable, rear dormer window with juliette balcony and 3no. front facing rooflights. Removal of a chimney (AMENDED DESCRIPTION)

  Granted Lawful development Extension Loft or dormer +1 5 docs

• 1 Derwent Avenue Barnet EN4 8LU

  26/2247/192 Submitted 16 Jun 2026 105m away

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

  Granted Lawful development Extension Loft or dormer +1 8 docs

• 32 Haslemere Avenue Barnet EN4 8EZ

  26/1095/HSE Submitted 23 Mar 2026 122m 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 122m 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 125m 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