18 November 2025 · Delegated - Principal Planner (A Morgan, Interim Director of Planning and Building Control)
3, Westham Lea, Castletown, Isle Of Man, IM9 1pd
The proposal involves demolishing a rear UPVC conservatory and lean-to store at 3 Westham Lea, a two-storey detached house on a corner plot in a small residential cul-de-sac in Castletown, and replacing them with a part single-storey (5.1m deep x 12.5m wide) and part two-storey (4.2m deep x 5.3m wide) rear extension fe…
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The officer concluded the proposal is an acceptable form of development that would not harm the use and enjoyment of neighbouring properties and complies with General Policy 2 and Residential Design G…
General Policy 2
Requires development to respect site/surroundings in siting/layout/scale/form/design (b,c), protect amenity (g), and safeguard trees/wildlife/habitats (d,f). Officer assessed rear extensions as proportionate/subservient with low flat roof profile, screened from public views, using contrasting high-quality materials that complement the house; no neighbour harm via overbearing/loss of light/overlooking; trees/ecology unaffected per DEFA, satisfying policy tests in residential context.
Strategic Policy 2 - Priority for new development to identified towns and villages
Supports residential development in zoned areas. Site in Residential zone within Castletown settlement boundary; extensions to existing dwelling acceptable in principle.
Priority for new development to identified towns and villages
Prioritises development in towns like Castletown. Proposal aligns as extension within zoned residential area.
Spatial Policy 3 - Port St Mary is a named Service Village
Requires respect for town character. Extension not visible publicly, subservient design maintains residential character.
Residential Design Guide 2021
Advises on householder extensions, visual impact, flat roofs, rear extensions. Flat roof acceptable with contemporary detailing, materials, fenestration; enhances rather than harms character/amenity.
Time limit
The development hereby approved shall be begun before the expiration of four years from the date of this decision notice. Reason: To comply with Article 26 of the Town and Country Planning (Development Procedure) Order 2019 and to avoid the accumulation of unimplemented planning approvals.
Materials approval
No development shall commence until a schedule of materials and finishes and samples of the materials to be used in the construction of the external surfaces, including roofs, have been submitted to and approved in writing by the Department. The development shall not be carried out unless in accordance with the approved details. Reason: In the interests of the character and appearance of the site and surrounding area.
No objection; registered trees and others not overly impacted; request standard tree retention condition if approved
No objection; recommend artificial house martin nest cup on east elevation eaves; advisory on nesting birds
DEFA Ecosystem Policy Team conducted a site inspection and found negligible bat roost potential impacted by the works but recommends checks if soffits are disturbed; recommends artificial house martin nest cup to mitigate loss of nesting sites.
Key concern: loss of house martin nesting location on northern elevation due to development
DEFA Ecosystem Policy Team
Conditional No Objectionrecommend that an artificial house martin nest cup is erected on the eastern elevation of the property. The locations highlighted in yellow would be suitable; If this Planning application has not already been determined, we recommend that this is secured via a condition; We recommend that the nest cup is erected before works are due to commence; thorough checks for bats and signs of bats... should be made first. The work must also be done carefully, so that any bats that may be resident within are not harmed
Conditions requested: artificial house martin nest cup erected on eastern elevation in yellow-highlighted locations, secured via condition; nest cup erected before works commence so house martins not deprived during nesting season
