20 Derwent Avenue Barnet EN4 8LX

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

• 26/2836/192 Awaiting decision

  20 Derwent Avenue Barnet EN4 8LX

  Roof extension involving rear dormer window with juliette balcony

  Submitted 31 Jul 2026

1. 9 Dec 2025

   Received by Barnet

2. 11 Dec 2025

   Validated

   Checked as complete and ready for consideration.

3. 30 Dec 2025

   Decision issued: Unlawful

4. 10 Aug 2026

   Added to PlanIndex

Barnet refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. More in our guide to what happens after a planning decision.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 20 Derwent Avenue Barnet EN4 8LX

  26/2836/192 Submitted 31 Jul 2026 50 yards away

  79% historically approved · decision due ~25 Sep

  Roof extension involving rear dormer window with juliette balcony

  Awaiting decision Extension Loft or dormer +1

• 4 Derwent Avenue Barnet EN4 8LX

  26/1823/192 Submitted 14 May 2026 50 yards 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

• 33 Avondale Avenue Barnet EN4 8LT

  24/1736/CON Submitted 1 May 2024 100 yards away

  Submission of details of condition 3 (Materials) pursuant to planning permission 22/1488/FUL dated 04/05/22

  Withdrawn Conditions 8 docs

• 1 Derwent Avenue Barnet EN4 8LU

  26/2247/192 Submitted 16 Jun 2026 100 yards 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 150 yards 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 150 yards away

  56% 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 Granted

  21 Myddelton Park London N20 0JH

  Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).

  Received 20 Jul, published by the council 7 Aug 2026 Lawful development
• 26/1362/191 Refused

  145 Cotswold Gardens London NW2 1PL

  Use as a House in Multiple Occupation (HMO) for 6 people

  Received 14 Apr, published by the council 25 Jul 2026 Lawful development
• 26/1907/191 Granted

  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)

  Received 21 May, published by the council 16 Aug 2026 Lawful development
• 26/2392/192 Refused

  6 Mostyn Road Edgware HA8 0JD

  New front hardstanding and vehicular access to provide off-street parking

  Received 23 Jun, published by the council 9 Aug 2026 Lawful development
• 26/2059/192 Refused

  Low Ridge Rowley Lane Barnet EN5 3HS

  Erection of a rear outbuilding

  Received 3 Jun, published by the council 16 Aug 2026 Lawful development