9 April 2025 · Delegated
7, Milner Terrace, Castletown, Isle Of Man, IM9 1aj
Permission was granted for the replacement of windows at 7 Milner Terrace, Castletown, a three-storey mid-terrace property. The application was submitted by Elma Tee and decided on 9 April 2025. The site is notable in that it is one of only two properties on Milner Terrace still retaining sliding sash windows. Over time, most other properties on the terrace have had their windows replaced with casement windows, some with and some without planning permission, meaning casement windows now define much of the conservation area's character. The officer assessed the proposal against the character and appearance of the area and flood risk, recommending approval. The decision was made by a Principal Planner under delegated authority and is subject to one condition.
The application was approved by a Principal Planner acting under delegated authority. The key planning considerations were the effect on the character and appearance of the area, as well as flood risk. The proposal was found to be acceptable on all these grounds.
Town and Country Planning Act (1999)
the proposal complies with Section 18(4) of the Town and Country Act (1999)
Isle of Man Strategic Plan 2016
Environment Policy 35 of the Isle of Man Strategic Plan 2016
Environment Policy 35: Within Conservation Areas, the Department will permit only development which would preserve or enhance the character or appearance of the Area, and will ensure that the special features contributing to the character and quality are protected against inappropriate development. 7.30 Development adjacent to Conservation Areas 7.30.1 It is often the case that important views into and out of a Conservation Area can contribute significantly to its character. It is necessary to assess the impact any development adjacent to conservation areas may have on such views.
Isle of Man Strategic Plan 2016
General Policy 2 of the Isle of Man Strategic Plan 2016 which sets out "development control" considerations
General Policy 2: Development which is in accordance with the land-use zoning and proposals in the appropriate Area Plan and with other policies of this Strategic Plan will normally be permitted, provided that the development: (a) is in accordance with the design brief in the Area Plan where there is such a brief; (b) respects the site and surroundings in terms of the siting, layout, scale, form, design and landscaping of buildings and the spaces around them; (c) does not affect adversely the character of the surrounding landscape or townscape; (d) does not adversely affect the protected wildlife or locally important habitats on the site or adjacent land, including water courses; (e) does not affect adversely public views of the sea; (f) incorporates where possible existing topography and landscape features, particularly trees and sod banks; (g) does not affect adversely the amenity of local residents or the character of the locality; (h) provides satisfactory amenity standards in itself, including where appropriate safe and convenient access for all highway users, together with adequate parking, servicing and manoeuvring space; (i) does not have an unacceptable effect on road safety or traffic flows on the local highways; (j) can be provided with all necessary services; (k) does not prejudice the use or development of adjoining land in accordance with the appropriate Area Plan; (l) is not on contaminated land or subject to unreasonable risk of erosion or flooding; (m) takes account of community and personal safety and security in the design of buildings and the spaces around them; and (n) is designed having due regard to best practice in reducing energy consumption. 6.3 Development outside of areas zoned for development
Isle of Man Strategic Plan
Environment Policy 10, which sets out that applications in a Flood Risk Zone must be accompanied by a Flood Risk Assessment
irements of the relevant gas supply agency. Flood Risk 63 There was widespread concern about the adequacy of drainage and the risk of flooding, particularly in parts of Braddan, Onchan and Laxey. Environment Policy 10 of the Strategic Plan indicates that where development is proposed on any site where there is a potential risk of flooding, the prospective developer will be required to submit a flood risk assessment, together with details of proposed mitigation measures. This approach is reinforced in Utilities Proposal 6 of the draft Area Plan, which (among other things) requires the incorporation of Sustainable Drainage Systems (SuDS) into new developments, to attenuate the rate of surface water run-off. I consider these policies to be reasonable. Clearly, without adequate mitigation measures, new building should normally be resisted on land which is at serious risk of flooding, or where the proposed development would increase the flood risk elsewhere. 64 In my view, the format of Utilities Proposal 6 could be improved. First, as a Proposal of the Area Plan, I consider that it should be in a bold typeface, to differentiate it from the supporting text. (The same applies to a number of other policies e.g. Transport Policy 2, and Utilities Policies 2 and 5). Second, there appears to be an error of syntax at the start of the second sentence of Utilities Proposal 6, which should perhaps read 'Strategies to achieve this will include …'. Third, the third bullet point of this Proposal introduces SuDS. Subsequent bullet points describe features of SuDS, and are therefore subordinate to the third bullet point. For clarity, I consider that they should be indented. I recommend that the draft Area Plan be modified accordingly. Sewage Treatment 65 There was also some public concern about the adequacy of the sewerage system, both in terms of its capacity to accommodate the effluent from proposed residential development areas, and in terms of the current practice of discharging untreated sewage into the sea. Infrastructure Policy 1 of the Strategic Plan indicates that developments entailing the erection of multiple dwellings should take place only on sites that will ultimately be connected to the IRIS system, which takes sewage to a treatment works at Meary Veg. (IRIS is an acronym for Integration and Recycling of the Island's Sewage). However, as long ago as 2006/7, a review was undertaken to decide whether to continue with the IRIS strategy. This concluded that it would be beneficial to adopt a regional sewage treatment strategy (RSTS) for those settlements that were not already connected to the IRIS system, including Laxey, Baldrine and settlements in the Central Valley. To that extent, Infrastructure Policy 1 of the Strategic Plan is now out of date. 66 I understand that a planning application will soon be submitted for the development of a local sewage treatment facility for Laxey. Feasibility studies for the provision of a similar facility to serve Baldrine are ongoing. A replacement sewage works at Ballagarey, serving part of the Central Valley became operational in 2018. However, capacity limitations mean that planned development in Crosby is likely to have to rely on standalone sewage treatment for the time being, until the existing treatment works is replaced as anticipated in 2022. The Programme for Government (2016-2021) indicates an intention to complete the regional sewage treatment infrastructure within the lifetime of the present administration. 67 It seems to me that these considerations should be taken into account in the allocation and phasing of land for development. I will return to this matter when considering the draft Area Plan's proposals for housing. Electricity Renewable Energy 68 Peel Energy considered that the Area Plan should contain a detailed and specific chapter on renewable energy, providing measurable criteria against which applications for the development of renewable power generating facilities would be assessed. They cited the States of Jersey Island Plan 2011, which includes such material. And they pointed out that a Climate Change Emergency has recently been declared on the Isle of Man; that a Climate Change Bill is soon to be presented to Tynwald; and that there has been strong public support for the Government's Climate Change Mitigation Strategy. They argued that, in failing to provide detailed guidance on renewable power generation, the Area Plan was inconsistent with the Strategic Plan; and that since the Area Plan post-dated the Strategic Plan, its largely negative provisions would prevail. 69 Energy Policy 4 of the Strategic Plan applies to development proposals for renewable energy generated by wind, water, tidal or solar power. It indicates that any such proposals will be judged against that Plan's environmental objectives. Proposals for wind, water or tidal power would need to be supported by an Environmental Impact Assessment. The supporting text indicates that renewable energy schemes will be given similar scrutiny as is gi
Planning Circular 1/98
Planning Circular 1/98 states that there is no preference in the material used in windows within a Conservation Area
Condition 1
The development hereby approved shall be begun before the expiration of four years from the date of this decision notice.
