1 Upper Cavendish Avenue London N3 3NN

1. 24 Sep 2026

   Received by Barnet

2. 29 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 19 November 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 46 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 decided householder applications in a median of 56 days. More in our guide to how long planning decisions take.

Householder applications cover work to an existing house and its garden, such as extensions, lofts and outbuildings, and cannot create a separate dwelling or change what the building is used for. More in our guide to planning application types.

• 35 Orchard Avenue London N3 3NL

  26/0433/192 Submitted 5 Feb 2026 50 yards away

  80% historically approved · decision due ~2 Apr

  Roof extension involving hip to gable, rear dormer window, 1no. rear and 2no. front facing rooflights and new side gable window

  Awaiting decision Lawful development Extension Loft or dormer +1 7 docs

• 35 Orchard Avenue London N3 3NL

  26/0434/HSE Submitted 4 Feb 2026 50 yards away

  77% historically approved · decision due ~2 Apr

  Single storey side and rear extension with 1no. rooflight and extension of the existing raised patio and associated balustrade and rear access steps following demolition of the existing garage and extension

  Awaiting decision Householder Extension Loft or dormer +1 7 docs
  Small domestic

• 35 Orchard Avenue London N3 3NL

  25/3971/192 Submitted 1 Oct 2025 50 yards away

  80% historically approved · decision due ~26 Nov

  Roof extension involving hip to gable, rear dormer window, 1no. rear and 2no. front facing rooflights and new side gable window

  Awaiting decision Lawful development Extension Loft or dormer +1 7 docs

• 44A Mountfield Road London N3 3NP

  21/4968/FUL Submitted 14 Sep 2021 50 yards away

  Roof extension involving side and rear dormer window with Juliette Balcony

  Refused Full applications Extension Loft or dormer +1 9 docs

• 44 Mountfield Road London N3 3NP

  26/1359/HSE Submitted 14 Apr 2026 50 yards away

  Existing rear extension parapet to be raised and capped with concrete coping stones. Green roof to new flat roof and addition of sliding doors and window to rear. Changes to side fenestration

  Granted Householder Extension Windows or glazing 17 docs
  Domestic

• 24 Mountfield Road London N3 3NE

  26/0420/192 Submitted 4 Feb 2026 150 yards away

  80% historically approved · decision due ~1 Apr

  Roof extension involving rear dormer window and 1no. rooflight

  Awaiting decision Lawful development Extension Loft or dormer +1 16 docs

• 26/3827/HSE Awaiting decision

  43 Hermitage Lane London NW2 2HE

  Single storey rear extension with 3no. rooflights following demolition of the existing conservatory. Replacement front bay window and entrance porch. First floor rear juliette balcony. Changes to fenestration including new window openings and enlarged front rooflight

  22 Oct 2026 Householder
• 26/3833/HSE Awaiting decision

  47 Holne Chase London N2 0QG

  Single storey rear extension. Replacement of single glazed windows with double glazing. Alterations to side/rear fenestration. Alterations and replacement of existing rear dormer window addition of 2no. side dormer windows and 3no. rooflights. Installation of cameras and wall lights. Replacement of the front entrance and garage doors, installation of timber side garden gates

  22 Oct 2026 Householder
• 26/3815/HSE Awaiting decision

  17 Hurstwood Road London NW11 0AS

  Single storey rear extension

  21 Oct 2026 Householder
• 26/3800/HSE Awaiting decision

  29 Monks Avenue Barnet EN5 1BZ

  Single storey side and rear infill extension including new front porch following demolition of the side/rear storage.

  Received 20 Oct, published by the council 21 Oct 2026 Householder
• 26/3791/HSE Awaiting decision

  149 Montrose Avenue Edgware HA8 0DZ

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

  Received 20 Oct, published by the council 21 Oct 2026 Householder