40 Northiam London N12 7HJ

This site has had 4 applications since 2025: 1 approved, 2 refused.

• 26/0613/HSE Refused

  40 Northiam London N12 7HJ

  Single storey side and rear extension including alteration to the existing access steps following demolition of the side garage and rear outbuilding

  Decided 16 Apr 2026 Householder
• 25/4397/PNH Refused

  40 Northiam London N12 7HJ

  Single storey rear and side extension with a proposed depth from the rear wall of 4.00m, maximum height of 3.00m and eaves height of 3.00m following the demolition of the existing side extension and shed

  Decided 10 Dec 2025 Prior approval
• 25/4202/192 Granted

  40 Northiam London N12 7HJ

  Roof extension involving hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window

  Decided 17 Nov 2025 Lawful development

1. 16 Jun 2026

   Received by Barnet

2. 9 Aug 2026

   Added to PlanIndex

Barnet has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

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.

• 58 Northiam London N12 7HJ

  25/4079/HSE Submitted 10 Oct 2025 50 yards away

  77% historically approved · decision due ~8 Dec

  Part single, part two storey front, side and rear extensions following demolition of existing garage and ground floor side and rear extension. Insertion of 1no. new first floor window to flank elevation. Alterations to front steps. New front porch. Alterations to rear patio

  Awaiting decision Householder Extension Demolition +1 20 docs
  Small domestic

• 58 Northiam London N12 7HJ

  25/4786/HSE Submitted 1 Dec 2025 50 yards away

  77% historically approved · decision due ~27 Jan

  Part single, part two storey front, side and rear extensions including alterations to front steps. new front porch and alterations to rear patio following demolition of existing garage and ground floor side and rear extension. Insertion of 1no. new first floor window to flank elevation.

  Awaiting decision Householder Extension Demolition +1 15 docs
  Small domestic

• 40 Northiam London N12 7HJ

  26/0613/HSE Submitted 17 Feb 2026 100 yards away

  Single storey side and rear extension including alteration to the existing access steps following demolition of the side garage and rear outbuilding

  Refused Householder Extension Demolition 14 docs
  Small domestic

• 40 Northiam London N12 7HJ

  25/4202/192 Submitted 20 Oct 2025 100 yards away

  Roof extension involving hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window

  Granted Lawful development Extension Loft or dormer +1 8 docs

• 40 Northiam London N12 7HJ

  25/4397/PNH Submitted 4 Nov 2025 100 yards away

  Single storey rear and side extension with a proposed depth from the rear wall of 4.00m, maximum height of 3.00m and eaves height of 3.00m following the demolition of the existing side extension and shed

  Refused Prior approval Extension Demolition 6 docs
  Small domestic

• 2 Michleham Down London N12 7JN

  24/1574/192 Submitted 19 Apr 2024 150 yards away

  Erection of a rear outbuilding

  Granted Lawful development 5 docs

• 26/3853/HSE Awaiting decision

  30 Goldsmith Avenue London NW9 7HB

  Single storey rear extension following demolition of the existing extension

  23 Oct 2026 Householder
• 26/3856/HSE Awaiting decision

  229 Hale Drive London NW7 3EH

  Single storey rear extension

  23 Oct 2026 Householder
• 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
• 26/3841/HSE Awaiting decision

  Manor House West Heath Close London NW3 7NJ

  New metal framed pergola to upper ground floor rear terrace

  Received 22 Oct, published by the council 23 Oct 2026 Householder