19 December 2022 · Delegated - Principal Planner Jason Singleton
60, Wybourn Drive, Onchan, Isle Of Man, IM3 4at
The proposal at 60 Wybourn Drive involved erecting a 5.7m deep by 7.1m wide flat-roof single-storey extension to the rear of the existing garage, stepping 1m further into the garden, with bi-folding doors, and a 8.6m wide by 2.4m tall flat-roof dormer covering nearly the full rear roof slope with three rear windows.
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The officer assessed the proposal against General Policy 2 (parts b, c, g) of the Isle of Man Strategic Plan 2016 and the Residential Design Guide 2021 (RDG), focusing on visual and amenity impacts.
General Policy 2
Requires development to respect character/appearance (b), provide good amenity (c), and safeguard amenity (g). Officer found proposal failed these parts due to overbearing size, scale, mass, and design of dormer and extension, creating unacceptable visual impacts on roof slope, dwelling, and neighbours. Assessed via RDG principles on subordinate appearance.
Residential Design Guide 2019 - Dormer extensions
Covers rear projection, 45-degree rule, tunnelling effect, and ensuring no amenity impact on neighbours. Extension's 5.7m projection and flat roof design deemed unacceptably large and overbearing, failing to remain subordinate to main dwelling and impacting views from rear.
Residential Design Guide 4.10 Dormer Extensions
Dormers should be secondary to roof slope, avoiding full width, flush with eaves/ridge, or clumsy appearance; appropriate where already characterising area if setback/stepped. Proposal's full-width, near-eaves flush, 2.4m tall dormer not secondary, overbearing on roof slope unlike local precedents.
No highways interest
Highway Services Division reported no highways interest (NHI) in the application, indicating no objection. Onchan District Commissioners recommended refusal due to the design of the single storey rear extension flat roof.
Key concern: Due to the design of the single storey rear extension flat roof
Highway Services Division
No Objectionthere is no Highways HDC interest (NHI) in: 22/01220/B
Onchan District Commissioners
ObjectionThe Commissioners continue to recommend that the application be REFUSED on the following grounds: 'Due to the design of the single storey rear extension flat roof.'
