4 Derwent Avenue Barnet EN4 8LX Data via plota.co.uk
Proposal
Roof extension involving hip to gable, rear dormer window with juliette balcony and 3no. front facing rooflights. Removal of a chimney (AMENDED DESCRIPTION) Data via plota.co.uk
Application progress
Approved on 9 Jun 2026 · Delegated Decision · Last checked 6 Jul 2026
Documents 5
Decision & officer reports 1
Plans & drawings 3
Site constraints 4
Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Sales history 1
Last sold for £551,000 in March 2016. Semi-detached house, freehold.
Sale prices from HM Land Registry's price paid record, matched to this application by its address.
Building
From the energy performance certificate lodged in January 2016, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate
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Roof extension involving rear dormer window with juliette balcony
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54 Derwent Avenue Barnet EN4 8LZ
Roof extension involving rear dormer window with juliette balcony
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Important details
- Council
- Barnet
- Application type
- Proposed Lawful Development Certificate
- Postcode
- EN4 8LX
- Received
- 14 May 2026
- Validated
- 20 May 2026
- Ward
- Brunswick Park
- Case officer
- Show
- Target decision
- 15 Jul 2026
- Decision
- Lawful
- Decision date
- 9 Jun 2026
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Steven Gray Design Limited
How this decision compares
Decided in 20 days from validation, 32 days faster than Barnet's median of 52 for extensions. Approved, as 75% of extensions here are.
Plota live figures for extensions decided by Barnet in the last twelve months, from validation. Barnet decision record →
Consultation & key dates
- Alt. reference
- PP-14936581
- Planning Portal ref
- PP-14936581
- Statutory expiry
- 15 Jul 2026
Historical activity at this location
27 previous applications on record - archival context, not part of the live application.
Previous applications at this address
Nearby activity
Barnet is faster than most councils at deciding householder applications, ranking #42 out of 296. Only 25% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Barnet is also one of the strictest councils - it refuses more householder applications than almost any other, with only 82% approved vs 90% nationally.
Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.
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4 Derwent Avenue Barnet EN4 8LX
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