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Planning application

37 Cornwall Avenue London N3 1LG

Refused Barnet 25/4558/FUL Full Application

Works: New dwelling Extension Loft or dormer Windows or glazing Small domestic

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

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

Proposal

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

As published by the council, reference 25/4558/FUL

Application record

Reference
25/4558/FUL
Type
Full Application
Status
Refused
Decision
Refused As published: Refuse
Received
14 Nov 2025
Validated
17 Nov 2025
Decided
12 Jan 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.

  • 26/0945/HSE Granted

    37 Cornwall Avenue London N3 1LG

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

    Decided 5 May 2026 Householder

Timeline

Dates from the published record

  1. 14 Nov 2025

    Received by Barnet

  2. 17 Nov 2025

    Validated

    Checked as complete and ready for consideration.

  3. 12 Jan 2026

    Decision issued: Refuse

  4. 10 Aug 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

84 applications on PlanIndex · across 13 councils · 71% granted

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Documents

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

12 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 refusal means

Barnet refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. More in our guide to what happens after a planning decision.

About full applications

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 37 Cornwall Avenue London N3 1LG

    26/0945/HSE Submitted 12 Mar 2026 50 yards away

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

    Granted Householder Extension Loft or dormer +2 13 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 (amended plans)

    Decided Householder Extension
    Small domestic

  • 32 Cornwall Avenue London N3 1LG

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

    79% 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 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

  • 26/3851/FUL Awaiting decision

    517 Watford Way London NW7 2QR

    Single storey extension to the rear of the existing workshop building to provide relocated MOT Bay

    23 Oct 2026 Full applications
  • 26/3848/FUL Awaiting decision

    157 Brent Street London NW4 4DJ

    Mansard roof extension involving 2no. front, 3no. side and 2no. rear dormer windows to provide 1no. self-contained flat including raising of the eaves level and addition of window to second floor. Removal of chimneys. Additional side door to ground floor level to provide access to cycle and refuse/recycling storage

    23 Oct 2026 Full applications
  • 26/3828/FUL Awaiting decision

    41 - 43 Sneath Avenue London NW11 9AJ

    Part single, part two storey rear extensions to both properties following the demolition of the single storey rear extension at no.43

    22 Oct 2026 Full applications
  • 26/3829/FUL Awaiting decision

    369 Watford Way London NW4 4TE

    Change of use of the existing dwelling (Use Class C3) to a 11 bed 11 Person HMO (House in Multiple Occupation) (Use Class Sui Generis) including part single, part two storey side and rear extensions and roof extension involving rear dormer window. Associated refuse/recycling storage, cycle parking, landscaping and external amenity space

    22 Oct 2026 Full applications
  • 26/3812/FUL Awaiting decision

    Ground Floor Battle House Mews 1 East Barnet Road Barnet EN4 8RR

    Erection of front canopy for fruit and vegetables area and installation awning and shutter box

    Received 21 Oct, published by the council 22 Oct 2026 Full applications