40 Northiam London N12 7HJ

1. 16 Jun 2026

   Received by Barnet

2. 9 Aug 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 58 Northiam London N12 7HJ

  25/4079/HSE Submitted 10 Oct 2025 5m 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 5m 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 90m 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 90m away

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

  Decided Lawful development Extension Loft or dormer +1 8 docs

• 40 Northiam London N12 7HJ

  25/4397/PNH Submitted 4 Nov 2025 90m 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 116m away

  Erection of a rear outbuilding

  Decided Lawful development 5 docs

• 26/3235/HSE Awaiting decision

  26 Mount Pleasant Barnet EN4 9HH

  Replace existing flat roof at ground floor rear elevation with pitched roof and 2no. rooflights

  4 Sep 2026 Householder
• 26/3222/HSE Awaiting decision

  46 Michleham Down London N12 7JN

  Single storey side/rear extension with 3no. rooflights following demolition of the existing storage/utility structure. Changes to fenestration

  3 Sep 2026 Householder
• 26/3219/HSE Awaiting decision

  53 Tudor Road Barnet EN5 5NW

  First floor rear extension with front and rear rooflights. Roof extension over existing garage

  2 Sep 2026 Householder
• 26/3210/HSE Awaiting decision

  47 Pattison Road London NW2 2HL

  New front vehicular access to provide off-street parking. Removal of existing gate and shed, alterations to the existing front boundary wall and installation of close board fencing panels.

  2 Sep 2026 Householder
• 26/3211/HSE Awaiting decision

  25 The Ridgeway London N11 3LG

  Single storey rear extension with 3no. rooflights following the demolition of existing conservatory

  2 Sep 2026 Householder