Planning application
29 Sefton Avenue London NW7 3QB
Works: Extension Loft or dormer Demolition Windows or glazing Small domestic
Read from the description, not a valuation. How we read the register
Decided. The decision notice on the council portal carries the outcome in full, including any conditions.
Proposal
Roof extension involving removal of the existing side and rear dormer window and new hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Demolition of the existing chimney. Single storey front porch extension. Demolition of the existing garage. Alterations to the existing driveway including removal of side boundary wall
As published by the council, reference 25/5133/192
Application record
- Reference
- 25/5133/192
- Type
- Proposed Lawful Development Certificate
- Status
- Unlawful
- Decision
- Unlawful
- Received
- 22 Dec 2025
- Validated
- 22 Dec 2025
- Decided
- 16 Jan 2026
- Ward
- Edgware
- Decision by
- Delegated Decision
- Postcode
- NW7 3QB
Site history
Applications at this address on the Barnet register
This site has had 2 applications since 2025.
-
26/0580/192 Decided
29 Sefton Avenue London NW7 3QB
Roof extension involving removal of the existing side and rear dormer window and new hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Demolition of the existing chimney. Single storey front porch extension. Demolition of the existing garage. Alterations to the existing driveway including removal of side boundary wall
Timeline
Dates from the published record
-
22 Dec 2025
Received by Barnet
-
16 Jan 2026
Decision issued: Unlawful
-
10 Aug 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
Agent on file, an architecture practice
5 applications on PlanIndex · across 2 councils
Trade members see who it is, their full track record, and every application they have filed.
See who's behind itDocuments
Plans, drawings, consultee responses and the officer's report
17 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.
Trade members open them from here.
Open the documentsAfter the decision
Barnet has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.
About lawful development applications
A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
29 Sefton Avenue London NW7 3QB
Roof extension involving removal of the existing side and rear dormer window and new hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window. Demolition of the existing chimney. Single storey front porch extension. Demolition of the existing garage. Alterations to the existing driveway including removal of side boundary wall
Decided Lawful development Extension Loft or dormer +2 15 docsSmall domestic -
31 Sefton Avenue London NW7 3QB
Non material amendment to planning permission 25/3239/HSE dated 01/10/2025 for 'First floor side extension. Roof extension involving hip to gable, rear dormer with glass balustrade for the juliette balcony and 3no. front facing rooflights. Changes to roof tiles and fenestration' Amendments includes removal of existing chimney and adjustment to front facing rooflights
Granted Amendments Extension Loft or dormer +2 9 docs -
63 Sefton Avenue London NW7 3QE
58% historically approved · decision due ~14 Aug
Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 4.00 metres and eaves height of 2.50 metres.
Awaiting decision Prior approval Extension 11 docsSmall domestic -
19 Downhurst Avenue London NW7 3QA
79% historically approved · decision due ~4 Aug
Roof extension with rear dormer windows, 2no. front facing roolights. New side gable window
Awaiting decision Extension Loft or dormer +1 -
2 Downhurst Avenue London NW7 3QA
77% historically approved · decision due ~3 Sep
Single storey rear extension
Awaiting decision Householder ExtensionSmall domestic -
2 Derwent Avenue London NW7 3DZ
79% historically approved · decision due ~1 Apr
Roof extension involving rear dormer windows and 2no. front facing rooflights
Awaiting decision Lawful development Extension Loft or dormer +1 5 docs
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26/2066/192 Decided
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Roof extension involving rear dormer window and 3no. front facing rooflights. Removal of chimney on rear elevation (AMENDED DESCRIPTION)
-
26/1663/192 Decided
152 Deans Lane Edgware HA8 9NT
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