15 Portman Gardens London NW9 5AS Data via plota.co.uk
Proposal
Roof extension involving hip to gable, rear dormer window and 3no. front facing rooflights Data via plota.co.uk
Application progress
Refused on 23 Jul 2026 · Delegated Decision · Last checked 3 Aug 2026
Documents 10
Decision & officer reports 2
Plans & drawings 7
Site constraints 4
Checked on 11 September 2026. Historic England, the Environment Agency, Natural England 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.
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Important details
- Council
- Barnet
- Application type
- Proposed Lawful Development Certificate
- Postcode
- NW9 5AS
- Received
- 24 Jun 2026
- Validated
- 25 Jun 2026
- Ward
- Burnt Oak
- Case officer
- Show
- Target decision
- 20 Aug 2026
- Decision
- Unlawful
- Decision date
- 23 Jul 2026
- Decision level
- Delegated Decision
- Applicant
- Show
- Agent
- Art Consultants (UK) Ltd
How this decision compares
Decided in 28 days from validation, 25 days faster than Barnet's median of 53 for extensions. Refused, as 26% of extensions here are.
Plota live figures for extensions decided by Barnet in the last twelve months, from validation. Barnet decision record →
Public comments
No public comments yet.
Last counted 3 Aug 2026
Consultation & key dates
- Alt. reference
- PP-15036105
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.
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15 Portman Gardens London NW9 5AS
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