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Planning application

26/1354/192

25 Park Avenue London NW11 7SL

Decided Barnet Proposed Lawful Development Certificate

Proposal

Alterations to 3no. existing chimneys and minor alterations to existing side dormer (Phase 1) Roof extensions and alterations involving 2no. side facing hip to gable extensions, 3no. front facing dormer windows, 2 no. rear facing dormer windows, new side gable windows and 2no. rear facing rooflights (Phase 2)

As published by the council, reference 26/1354/192

Timeline

Dates from the published record

  1. 13 Apr 2026

    Received by Barnet

  2. 14 Apr 2026

    Validated

    Checked as complete and ready for consideration.

  3. 11 May 2026

    Decision issued: Lawful

  4. 25 Jul 2026

    Added to PlanIndex

After the decision

The process from here

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

About lawful development applications

How this application type works

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

Nearby applications

Within 500 metres

  • 26/2623/FUL Awaiting decision

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  • 26/2656/HSE Awaiting decision

    25 Park Avenue London NW11 7SL

    Roof extension including hip to gable to both sides with gable windows, 3no. dormer windows to front elevation, 2no. dormer windows and 2no. rooflights to rear elevation. Alterations to existing chimneys. Replacement of existing ground and first floor windows

    16 Jul 2026 61m away Householder
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  • 26/2585/CON Awaiting decision

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  • TPP/0270/26 Decided

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In Barnet

  • 26/2836/192 Awaiting decision

    20 Derwent Avenue Barnet EN4 8LX

    Roof extension involving rear dormer window with juliette balcony

    31 Jul 2026 Lawful development
  • 26/2815/192 Awaiting decision

    18 Boyne Avenue London NW4 2JN

    Roof extension involving rear dormer window and 2no. front facing rooflights

    30 Jul 2026 Lawful development
  • 26/2824/192 Awaiting decision

    41 Greenway Close London N20 8ES

    Erection of a rear outbuilding

    30 Jul 2026 Lawful development
  • 26/2809/192 Awaiting decision

    43A Clifford Road Barnet EN5 5PD

    Single storey rear extension following the demolition of existing canopy

    29 Jul 2026 Lawful development
  • 26/2806/192 Awaiting decision

    14 Lincoln Road London N2 9DL

    Roof extension involving 1no. rear dormer window over main roof with juliette balcony and 1no. rear dormer over outrigger roof and 3no. front facing rooflights. Alterations to existing lean-to to form rear extension with flat roof with parapet walls and 1no. skylight. Alterations to fenestration and doors

    29 Jul 2026 Lawful development