16 Sefton Avenue London NW7 3QD

1. 28 Sep 2026

   Received by Barnet

2. 29 Sep 2026

   Added to PlanIndex

3. Decision

   Awaiting decision

   Decision expected by 23 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 prior approval applications in a median of 36 days. More in our guide to how long planning decisions take.

Prior approval applies where permitted development rights already grant the principle of the work, leaving the council only the specific matters the rules name, commonly within 56 days. More in our guide to planning application types.

• 31 Sefton Avenue London NW7 3QB

  25/5113/NMA Submitted 19 Dec 2025 50 yards away

  Non material amendment to planning permission 25/3239/HSE dated 01/10/2025 for 'First floor side extension. Roof extension involving hip to gable, rear dormer with glass balustrade for the juliette balcony and 3no. front facing rooflights. Changes to roof tiles and fenestration' Amendments includes removal of existing chimney and adjustment to front facing rooflights

  Granted Amendments Extension Loft or dormer +2 9 docs

• 63 Sefton Avenue London NW7 3QE

  26/2326/PNH Submitted 19 Jun 2026 50 yards away

  56% historically approved · decision due ~14 Aug

  Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 4.00 metres and eaves height of 2.50 metres.

  Awaiting decision Prior approval Extension 11 docs
  Small domestic

• 29 Sefton Avenue London NW7 3QB

  26/0580/192 Submitted 16 Feb 2026 100 yards away

  Roof extension involving removal of the existing side and rear dormer window and new hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Demolition of the existing chimney. Single storey front porch extension. Demolition of the existing garage. Alterations to the existing driveway including removal of side boundary wall

  Granted Lawful development Extension Loft or dormer +2 15 docs
  Small domestic

• 29 Sefton Avenue London NW7 3QB

  25/5133/192 Submitted 22 Dec 2025 100 yards away

  Roof extension involving removal of the existing side and rear dormer window and new hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Demolition of the existing chimney. Single storey front porch extension. Demolition of the existing garage. Alterations to the existing driveway including removal of side boundary wall

  Refused Lawful development Extension Loft or dormer +2 17 docs
  Small domestic

• 63 Sefton Avenue London NW7 3QE

  26/1690/PNH Submitted 6 May 2026 100 yards away

  Single storey rear extension with a proposed maximum depth of 6.00 metres, maximum height of 4.00 metres and an eaves height of 2.40m

  Refused Prior approval Extension 12 docs
  Small domestic

• 63 Sefton Avenue London NW7 3QE

  26/0597/192 Submitted 16 Feb 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 11 docs

• 26/3835/PNH Awaiting decision

  3 Devonshire Crescent London NW7 1DN

  Single storey rear extension with a proposed depth of 5.00 metres, maximum height of 3.48 metres and eaves height of 3.00 metres. Following demolition of existing rear outrigger.

  22 Oct 2026 Prior approval
• 26/3832/PNH Awaiting decision

  48 Alverstone Avenue Barnet EN4 8EB

  Single storey rear extension with a proposed depth of 4.5 metres, maximum height of 3.15 metres and eaves height of 3 metres following demolition of existing rear extension.

  22 Oct 2026 Prior approval
• 26/3823/PNH Awaiting decision

  7 Southbourne Crescent London NW4 2LB

  Single storey rear extension added to an existing extension with the total extension measuring 6.00 metres deep, with a maximum height of 3.00 metres and an eaves height of 3.00 metres.

  21 Oct 2026 Prior approval
• 26/3809/PND Awaiting decision

  10 Clifford Road Barnet EN5 5PG

  Demolition of existing garage

  21 Oct 2026 Prior approval
• 26/3819/PNH Awaiting decision

  78 Russell Lane London N20 0AP

  2no. Single storey rear extensions with a proposed depth of 7.00 metres, maximum height of 3.60 metres and eaves height of 3.00 metres. Following demolition of the existing side/rear outrigger.

  Received 20 Oct, published by the council 22 Oct 2026 Prior approval