Planning application
18 Helenslea Avenue London NW11 8ND
Works: Extension Loft or dormer Windows or glazing
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window
As published by the council, reference 26/0068/192
Application record
- Reference
- 26/0068/192
- Type
- Proposed Lawful Development Certificate
- Status
- Pending Decision
- Received
- 8 Jan 2026
- Validated
- 8 Jan 2026
- Ward
- Childs Hill
- Postcode
- NW11 8ND
Timeline
Dates from the published record
-
8 Jan 2026
Received by Barnet
-
10 Aug 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 5 March 2026, 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 42 days over the applications it decided in the last year.
Documents
Plans, drawings, consultee responses and the officer's report
8 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 documentsWhat happens while it is decided
The process from here
This application is with Barnet for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
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.
Nearby applications
Within 500 metres
-
18 Helenslea Avenue London NW11 8ND
77% historically approved · decision due ~9 Feb
Single storey side and rear wrap around extension with side and rear rooflights, following demolition of existing conservatory and garage. New front porch. Alterations to front garden including resurfacing of driveway and replacement of front pathway and step access
Awaiting decision Householder Extension Loft or dormer +1 11 docsSmall domestic -
68 Hodford Road London NW11 8NG
79% historically approved · decision due ~11 Mar
Two storey rear extension. Erection of a rear outbuilding. Roof extension involving insertion of 2no. front and rear facing rooflights following removal of the existing rear dormer window. Changes to fenestration
Awaiting decision Lawful development Extension Loft or dormer +1 3 docs -
68 Hodford Road London NW11 8NG
79% historically approved · decision due ~18 Nov
Roof extension including side dormer window, 2no. front and rear facing rooflights and new side gable window. Two storey rear extension. Erection of a rear outbuilding
Awaiting decision Lawful development Extension Loft or dormer +1 3 docs -
26 Dunstan Road London NW11 8AA
Single storey rear infill extension
Granted Householder Extension 13 docsSmall domestic -
52 Hodford Road London NW11 8NJ
70% historically approved · decision due ~30 Sep
Non material amendment to planning permission 25/2474/HSE dated 17/06/2025 for 'Part single, part two storey side and rear extension. Front extension and conversion of the existing garage into habitable room, including insertion of window and door to replace garage door. Replacement of existing windows. Roof extension involving rear dormer window.'. Amendments includes changing material of proposed extension to traditional brick red and reconciling the window dimensions, to balance the rear elevation to have equal sized windows
Awaiting decision Amendments Extension Loft or dormer +1 -
833 - 835 Finchley Road London NW11 8NA
79% historically approved · decision due ~7 Sep
Submission of details of condition 4 (Disabled Parking) 5 (Cycle parking) 6 (Demolition and Construction Management and Logistics Plan) 8 (Survey of Public Highway) 9 (Travel Plan) 10 (Biodiversity Gain Plan) 11 (Habitat Management and Monitoring Plan) 14 (Low Impact Lighting Strategy) 16 (NRMM) 23 (Hard and Soft Landscaping) pursuant to planning permission 24/5181/FUL dated 07/07/2026
Awaiting decision Demolition
Other lawful development applications
In Barnet
-
26/1907/191 Decided
8 Golders Manor Drive London NW11 9HT
Use of the property as a self-contained residential unit at ground floor level and the first and second floors as a 4-bedroom, 4-person House in Multiple Occupation (Sui Generis) (AMENDED DESCRIPTION)
-
26/2059/192 Decided
Low Ridge Rowley Lane Barnet EN5 3HS
Erection of a rear outbuilding
-
26/2066/192 Decided
355 Hendon Way London NW4 3NB
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
Change of use from single family dwellinghouse (Class C3a) to supported living accommodation Class C3b)
-
26/2025/192 Decided
18 Hale Drive London NW7 3DU
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window