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Planning application

40 Northiam London N12 7HJ

Refused Barnet 25/4397/PNH Prior Notification (Householder)

Works: Extension Demolition 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

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

As published by the council, reference 25/4397/PNH

Application record

Reference
25/4397/PNH
Type
Prior Notification (Householder)
Status
Prior Approval Required and Refused
Decision
Refused As published: Prior Approval Required and Refused
Received
4 Nov 2025
Validated
5 Nov 2025
Decided
10 Dec 2025
Ward
Totteridge & Woodside
Decision by
Delegated Decision
Postcode
N12 7HJ

Site history

Applications at this address on the Barnet register

This site has had 4 applications since 2025: 1 approved, 2 refused.

  • 26/2250/HSE Decided

    40 Northiam London N12 7HJ

    Single storey side and rear extension including 3no. flat rooflights and alteration to the existing access steps following demolition of the side garage and rear outbuilding

    Submitted 16 Jun 2026 Householder
  • 26/0613/HSE Refused

    40 Northiam London N12 7HJ

    Single storey side and rear extension including alteration to the existing access steps following demolition of the side garage and rear outbuilding

    Decided 16 Apr 2026 Householder
  • 25/4202/192 Granted

    40 Northiam London N12 7HJ

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

    Decided 17 Nov 2025 Lawful development

Timeline

Dates from the published record

  1. 4 Nov 2025

    Received by Barnet

  2. 5 Nov 2025

    Validated

    Checked as complete and ready for consideration.

  3. 10 Dec 2025

    Decision issued: Prior Approval Required and Refused

  4. 10 Aug 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Reed Design Agent, a design practice registered in Leamington Spa

Dissolved · incorporated 1999 · Leamington Spa

2 applications on PlanIndex

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Documents

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

6 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 prior approval applications

Prior approval applies where permitted development rights already grant the principle of the work, leaving the council only the specific matters the rules name, commonly within 56 days. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • 40 Northiam London N12 7HJ

    26/0613/HSE Submitted 17 Feb 2026 50 yards 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 50 yards away

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

    Granted Lawful development Extension Loft or dormer +1 8 docs

  • 71 Southover London N12 7HG

    26/2397/CON Submitted 24 Jun 2026 50 yards away

    Submission of details of condition 7 (Noise mitigation - Air Con and ASHP) pursuant to planning permission 26/0983/HSE dated 15/06/2026

    Granted Conditions 3 docs

  • 71 Southover London N12 7HG

    26/0983/HSE Submitted 16 Mar 2026 50 yards away

    77% historically approved · decision due ~15 Jun

    Conversion of garage into habitable room including insertion of windows to replace existing garage doors and addition of new pitched roof with rooflight. Two storey side extension following demolition of existing store. Roof extension including 1no. side dormer window, 1no. rear dormer window and 2no. front facing rooflights and increase in ridge height. Installation of solar panels. Alterations to ground floor rear projection including changes to fenestration and insertion of rooflights to flat roof. Addition of 1no. AC condenser unit and 1no. Air Source Heat Pump to side elevation. Removal of chimneys

    Awaiting decision Householder Extension Loft or dormer +3 6 docs
    Domestic

  • 40 Northiam London N12 7HJ

    26/2250/HSE Submitted 16 Jun 2026 100 yards away

    77% historically approved · decision due ~11 Aug

    Single storey side and rear extension including 3no. flat rooflights and alteration to the existing access steps following demolition of the side garage and rear outbuilding

    Decided Householder Extension Loft or dormer +1
    Several homes

  • 58 Northiam London N12 7HJ

    25/4079/HSE Submitted 10 Oct 2025 100 yards 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

In Barnet

  • 26/3835/PNH Awaiting decision

    3 Devonshire Crescent London NW7 1DN

    Single storey rear extension with a proposed depth of 5.00 metres, maximum height of 3.48 metres and eaves height of 3.00 metres. Following demolition of existing rear outrigger.

    22 Oct 2026 Prior approval
  • 26/3832/PNH Awaiting decision

    48 Alverstone Avenue Barnet EN4 8EB

    Single storey rear extension with a proposed depth of 4.5 metres, maximum height of 3.15 metres and eaves height of 3 metres following demolition of existing rear extension.

    22 Oct 2026 Prior approval
  • 26/3823/PNH Awaiting decision

    7 Southbourne Crescent London NW4 2LB

    Single storey rear extension added to an existing extension with the total extension measuring 6.00 metres deep, with a maximum height of 3.00 metres and an eaves height of 3.00 metres.

    21 Oct 2026 Prior approval
  • 26/3809/PND Awaiting decision

    10 Clifford Road Barnet EN5 5PG

    Demolition of existing garage and attached pitched-roof structure

    21 Oct 2026 Prior approval
  • 26/3819/PNH Awaiting decision

    78 Russell Lane London N20 0AP

    2no. Single storey rear extensions with a proposed depth of 7.00 metres, maximum height of 3.60 metres and eaves height of 3.00 metres. Following demolition of the existing side/rear outrigger.

    Received 20 Oct, published by the council 22 Oct 2026 Prior approval