Planning application
1 Derwent Avenue Barnet EN4 8LU
Works: Extension Loft or dormer Windows or glazing
Decided. The decision notice on the council portal carries the outcome in full, including any conditions.
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 26/2247/192
Application record
- Reference
- 26/2247/192
- Type
- Proposed Lawful Development Certificate
- Status
- Lawful
- Decision
- Lawful
- Received
- 16 Jun 2026
- Validated
- 26 Jun 2026
- Decided
- 17 Jul 2026
- Ward
- Brunswick Park
- Decision by
- Delegated Decision
- Postcode
- EN4 8LU
Timeline
Dates from the published record
-
16 Jun 2026
Received by Barnet
-
26 Jun 2026
Validated
Checked as complete and ready for consideration.
-
17 Jul 2026
Decision issued: Lawful
-
10 Aug 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
Agent on file, a design practice registered in Southall
138 applications on PlanIndex · across 25 councils · 66% granted
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
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 documentsAfter 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.
Nearby applications
Within 500 metres
-
4 Derwent Avenue Barnet EN4 8LX
Roof extension involving hip to gable, rear dormer window with juliette balcony and 3no. front facing rooflights. Removal of a chimney (AMENDED DESCRIPTION)
Decided Lawful development Extension Loft or dormer +1 5 docs -
20 Derwent Avenue Barnet EN4 8LX
Roof extension involving rear dormer window with juliette balcony
Decided Lawful development Extension Loft or dormer +1 10 docs -
20 Derwent Avenue Barnet EN4 8LX
79% historically approved · decision due ~25 Sep
Roof extension involving rear dormer window with juliette balcony
Awaiting decision Extension Loft or dormer +1 -
Land Side Of The Rectory 136 Church Hill Road East Barnet EN4 8XD
Installation of a 17.38 metre high monopole supporting 6no. antennas and a 300mm transmission dish. Installation of 3no. equipment cabinets and ancillary development thereto
Refused Telecoms 17 docs -
St Marys The Virgin Church Of England Church Church Hill Road Barnet EN4 8XD
1 x Dead Tree - Fell. Standing in Area A1 of Tree Preservation Order. (Exempted 5 day notice)
Decided Trees 3 docs -
32 Haslemere Avenue Barnet EN4 8EZ
79% historically approved · decision due ~28 Aug
Roof extension involving hip to gable, rear dormer window, 3no. front-facing rooflights and new side gable window following the removal of the chimney. Erection of a rear outbuilding. (Amended Description)
Awaiting decision Extension Loft or dormer +1
Other lawful development applications
In Barnet
-
26/2679/192 Decided
21 Myddelton Park London N20 0JH
Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).
-
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)