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Planning application

37 Cornwall Avenue London N3 1LG

Granted Barnet 26/0945/HSE Householder Application

Works: Extension Loft or dormer Demolition Windows or glazing Small domestic

Read from the description, not a valuation. How we read the register

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

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

Application record

Reference
26/0945/HSE
Type
Householder Application
Status
Approved subject to conditions
Decision
Granted As published: Approve subject to conditions
Received
12 Mar 2026
Validated
12 Mar 2026
Decided
5 May 2026
Ward
West Finchley
Decision by
Delegated Decision
Postcode
N3 1LG

Site history

Applications at this address on the Barnet register

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

  • 25/4558/FUL Refused

    37 Cornwall Avenue London N3 1LG

    Conversion of the existing dwelling into 2no. self-contained flats including single storey rear extension with green roof and parapet, front porch infill, first floor rear terrace area with obscure glazing, roof extension involving rear dormer window and 4no. front facing rooflights

    Decided 12 Jan 2026 Full applications

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

Who's behind it

Company information only, from the register and Companies House

G2 Architecture Agent, an architecture practice registered in Ware

Active · incorporated 2023 · Ware

70 applications on PlanIndex · across 10 councils · 60% granted

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Documents

Plans, drawings, consultee responses and the officer's report

13 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

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What this grant of permission means

Barnet granted permission on 5 May 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.

About householder applications

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.

Nearby applications

Within 0.3 miles

  • 37 Cornwall Avenue London N3 1LG

    25/4558/FUL Submitted 14 Nov 2025 50 yards away

    Conversion of the existing dwelling into 2no. self-contained flats including single storey rear extension with green roof and parapet, front porch infill, first floor rear terrace area with obscure glazing, roof extension involving rear dormer window and 4no. front facing rooflights

    Refused Full applications New dwelling Extension +2 12 docs
    Small domestic

  • 39 Cornwall Avenue London N3 1LG

    25/5142/192 Submitted 22 Dec 2025 50 yards away

    80% historically approved · decision due ~16 Feb

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

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

  • 39 Cornwall Avenue London N3 1LG

    25/3818/HSE Submitted 17 Sep 2025 50 yards away

    77% historically approved · decision due ~12 Nov

    Single storey rear extension. Conversion of the existing garage into habitable room, insertion of window to replace the garage door

    Awaiting decision Householder Extension Windows or glazing 9 docs
    Small domestic

  • 39 Cornwall Avenue London N3 1LG

    26/3192/HSE Submitted 1 Sep 2026 50 yards away

    77% historically approved · decision due ~27 Oct

    New front porch

    Awaiting decision Householder Extension
    Small domestic

  • 32 Cornwall Avenue London N3 1LG

    26/2627/191 Submitted 14 Jul 2026 50 yards away

    80% historically approved · decision due ~1 Oct

    Conversion of part of the 1st floor and 2nd floor to create 1no. self-contained residential dwelling (Use Class C3)

    Awaiting decision Lawful development 18 docs
    Domestic

  • First Floor Flat 33 Grove Avenue London N3 1QS

    26/0556/FUL Submitted 12 Feb 2026 50 yards away

    Change of use of the upper floor flat (Class C3) to a 3 bed House in Multiple Occupation (HMO) (Class C4). Associated refuse/recycling and cycle storage (AMENDED DESCRIPTION)

    Refused Full applications 15 docs

In Barnet

  • 26/3422/HSE Awaiting decision

    Revelstroke 28 Totteridge Village London N20 8JN

    Construction of a swimming pool and associated hard and soft landscaping following demolition of the existing shed including new access steps. Alterations to the ground level. Replacement of an existing timber decking terrace with a paved terrace.

    18 Sep 2026 Householder
  • 26/3396/HSE Awaiting decision

    43 Dukes Avenue London N3 2DE

    Single storey rear, part two storey side extension with 1no. rooflight following the demolition of existing shed. Roof extension with rear dormer window, 1no. front, 3no. side facing rooflights and roof windows to the front and side roof slopes. Installation of solar panels to side elevation of roof

    17 Sep 2026 Householder
  • 26/3410/HSE Awaiting decision

    54 Ferney Road Barnet EN4 8LE

    Single storey rear extension with alteration to the raised terrace area including new access steps to garden

    17 Sep 2026 Householder
  • 26/3415/HSE Awaiting decision

    11 Downage London NW4 1AS

    Alterations and extensions to the roof including rear dormer window and the partial removal of the roof of the first floor rear extension, creation of a new crown roof over main roof and rear extension, 1no. front, 1no. side, 1no. rear facing rooflight and 1no. on crown roof

    Received 17 Sep, published by the council 18 Sep 2026 Householder
  • 26/3382/HSE Awaiting decision

    11 Layfield Crescent London NW4 3UJ

    Part single, part two storey rear extension with flat roof and 1no. skylight

    Received 16 Sep, published by the council 18 Sep 2026 Householder