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Planning application

26/0945/HSE

37 Cornwall Avenue London N3 1LG

Granted Barnet Householder Application

Proposal

Single storey rear extension following demolition of the existing sun room. Roof extension involving rear dormer windows and 4no. front facing rooflights

As published by the council, reference 26/0945/HSE

Timeline

Dates from the published record

  1. 12 Mar 2026

    Received by Barnet

  2. 5 May 2026

    Decision issued: Approve subject to conditions

  3. 25 Jul 2026

    Added to PlanIndex

What a grant of permission means

The process from here

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

About householder applications

How this application type works

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

Nearby applications

Within 500 metres

  • 26/1447/HSE Awaiting decision

    9 Lovers Walk London N3 1JH

    Remodelling of the existing outbuilding including new access steps to garden level and replacement of flat roof with pitched roof to provide loft storage with internal access following removal of the existing wall

    20 Apr 2026 96m away Householder
  • 26/1446/HSE Awaiting decision

    15 Sellers Hall Close London N3 1JL

    Extension of the existing outbuilding and replacement of flat roof with pitched roof to provide loft storage with internal access

    20 Apr 2026 122m away Householder
  • 26/1149/192 Decided

    11 Grove Avenue London N3 1QS

    Roof extension involving 1no. rear dormer window over main roof and 1no. rear dormer over outrigger roof with side window and 2no. front facing rooflights.

    26 Mar 2026 137m away Lawful development
  • 26/2590/HSE Awaiting decision

    20 Wentworth Park London N3 1YG

    Single storey front, side and rear extension following demolition of the existing garage. Formation of side annexe. First floor rear extension

    10 Jul 2026 155m away Householder
  • 26/2653/CON Awaiting decision

    Flat 2 202 Nether Street London N3 1JD

    Submission of details of condition 4 (Foundations) pursuant to planning permission 26/1743/FUL dated 06/07/2026

    15 Jul 2026 220m away Conditions
  • 26/1743/FUL Awaiting decision

    Flat 2 202 Nether Street London N3 1JD

    Erection of a rear outbuilding

    11 May 2026 235m away Full applications

In Barnet

  • 26/2837/HSE Awaiting decision

    26 The Drive Barnet EN5 4JQ

    Single storey side and rear extension with 7no. rooflights

    31 Jul 2026 Householder
  • 26/2840/HSE Awaiting decision

    19 Wildwood Road London NW11 6UL

    Replacement of the existing front door, double glazing to existing windows and internal secondary glazing to front elevations; roof covering replacements, soffit and gutter repairs; security cameras, garden shed repairs and repainting, rear boundary hedges to 2.5m with concealed metal fencing

    31 Jul 2026 Householder
  • 26/2813/HSE Awaiting decision

    3 Delamere Gardens London NW7 3EA

    Single storey front extension incorporating a front porch, raising existing side extension floor level to match main house level, new roof with increased height to the side extension and 2no. rooflights, single storey rear extension with 4no. rooflights with new patio area, access steps to garden and hard and soft landscaping. Changes to fenestration: replacement of existing windows

    30 Jul 2026 Householder
  • 26/2812/HSE Awaiting decision

    60 Millway London NW7 3RA

    Two storey side extension linking to house and single storey rear infill extension following demolition of the existing garage. Associated alterations to roof

    30 Jul 2026 Householder
  • 26/2803/HSE Awaiting decision

    15 Poynings Way London N12 7LP

    Part single, part two storey side and rear extension. Conversion and extension of the existing garage, insertion of window to replace garage door. New front porch

    29 Jul 2026 Householder