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Planning application

39 Cornwall Avenue London N3 1LG

Awaiting decision Barnet 25/3818/HSE Householder Application

Works: Extension Windows or glazing Small domestic

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

Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.

Proposal

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

As published by the council, reference 25/3818/HSE

Application record

Reference
25/3818/HSE
Type
Householder Application
Status
Pending Consideration
Received
17 Sep 2025
Validated
17 Sep 2025
Ward
West Finchley
Postcode
N3 1LG

Site history

Applications at this address on the Barnet register

This site has had 3 applications since 2025.

  • 26/3192/HSE Decided

    39 Cornwall Avenue London N3 1LG

    New front porch (amended plans)

    Submitted 1 Sep 2026 Householder
  • 25/5142/192 Awaiting decision

    39 Cornwall Avenue London N3 1LG

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

    Submitted 22 Dec 2025 Lawful development

Timeline

Dates from the published record

  1. 17 Sep 2025

    Received by Barnet

  2. 10 Aug 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    Decision expected by 12 November 2025, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

    Barnet took a median of 46 days over the applications it decided in the last year.

Who's behind it

Company information only, from the register and Companies House

Mehra Design Services Agent, a design practice

1 application on PlanIndex

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See their track record

Documents

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

9 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.

Watch members (£5 a month) open the document list from here.

Open the documents

What happens while it is decided

This application is with Barnet for determination, against a statutory target of eight weeks. Over the last year Barnet decided householder applications in a median of 56 days. More in our guide to how long planning decisions take.

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

  • 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

  • 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

  • 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

    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

    78% 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

  • 26/3853/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