- Decision
- dismissed, 21 September 2026
- Decided by
- Planning Inspector: John Morrison (on recommendation of Appeal Planning Officer S Manson)
- Authority
- Harrow (London)
- Appeal reference
- 6010702
- Application reference
- PL/3354/25
- Procedure
- written representations
- Development
- Extensions to create a new 3-bed dwelling attached to the existing house, with subdivision of the garden
- Homes
- 1
- Site context
- inside settlement
- Green Belt
- No
- Framework applied
- August 2026 NPPF
- Determinative policies
- S4(1), P3, DP3, TR6(4)
- Development plan policies
- Harrow Local Plan 2021-2041 (adopted 2026) HO2, London Plan 2021
- Main issues
- living conditions; highway safety/parking; character (refuse storage)
Summary
Extending a house in Canons Park to form a second 3-bed dwelling. Dismissed on the recommendation of an Appeal Planning Officer, with no re-consultation on the new Framework (DL ¶4). Sub-standard ceiling heights (P3), overspill parking at PTAL 2 (TR6), and bin storage reachable only via a barriered footpath (DP3) were each given substantial weight. One net unit had moderate weight and was substantially outweighed under S4 (DL ¶23-24).
What made the difference
Several separate failures, each linked to a Framework decision-making policy. Notably, a TR6 highway-safety finding rested on parking displacement with no survey evidence, not on a specific access defect (DL ¶12-14).
Policy findings
Policy codes are those of the National Planning Policy Framework (August 2026) unless a development plan is named.
| Policy | Finding | Weight | Note |
|---|---|---|---|
| P3 | fail | substantial | first floor 2.3 m ceilings; under 75% of GIA at 2.5 m in both dwellings (DL 6-8, 23) |
| TR6(4) | fail | substantial | PTAL 2, head of cul-de-sac, no parking survey; overspill parking harms safety (DL 9-14) |
| S4(1) | fail | one net unit in "apparent undersupply" given moderate weight; substantially outweighed (DL 22-24) |
Key facts
- PTAL 2; local plan permits conversions only in PTAL 3-6
- Bins would have to be wheeled along a public footpath with staggered barriers
Sources
This note is one of the decisions behind the NPPF 2026 Navigator, which shows how each Framework test has been applied across all the decisions in the database. Also available as Markdown.