Development Type
Building Regulations
Roof extension/ loft conversion
Roof terrace/ balcony
Conversion into flats
Borough
Westminster
4 Mill Street, London, W1S 2AX
Before
After
Roof extension, conversion into four flats
Erection of a rear roof extension at third floor level with a sedum roof to the rear; replacement of windows at second floor level with double glazing timber windows; replacement of door and window to the existing rear first floor extension with double glazing timber windows including replacement of roofing; and associated works all in connection with the use of the first to third floor as four flats (Class C3).
4D Planning were instructed to undertake a feasibility assessment to establish the full potential of the property. We concluded that there is scope to convert the upper floors into residential and to extend at the rear. We were then asked to prepare a design for the conversion of the upper floors into four flats with a range of sizes, accommodate planning considerations in terms of minimum size standards, refuse, cycle parking and other relevant planning policies. As the property was in a Conservation Area, we incorporated careful design measures into the scheme, such as a green sedum roof, replacement of materials like for like or making good where possible. We upgraded the windows and rear first floor door to double glazing. We prepared the planning application and negotiated the scheme and its many details with Westminster Council planning officers. The application was granted planning permission. We were then commissioned to prepare the Building Regulations drawings and to coordinate with the Structural Engineer and Building Control to achieve a pass.
Westminster's planning policies, especially for properties within conservation areas, are strict to maintain the architectural and historical character of the district. This makes it crucial to get professional advice to assess the feasibility of your project at the outset.
At 4D Planning, we have a deep understanding of Westminster's local planning guidelines, including planning policies on roof extensions and conversions. We guide you from initial feasibility studies through to the preparation of architectural drawings and the submission of your planning application. We assess potential challenges such as parking, light, minimum size standards, and conservation rules, and ensure that all elements comply with Westminster Council’s regulations.
Our expertise allows us to confidently handle complex cases, even when planning permission seems difficult. For instance, conservation areas often have more restrictions on structural changes like roof extensions, replacement of windows or alterations to a building’s façade. We help anticipate these hurdles, making sure the proposal meets all necessary criteria without harming the area's character. We liaise with Westminster Council planning officers and negotiate where required to ensure that all issues are addressed satisfactorily.
Planning permission in Westminster is more than just submitting an application; it requires deep knowledge of local regulations and the right approach to highlight the benefits of your project. At 4D Planning, we make sure your application for the conversion into flats is as strong as possible, increasing your chance of success.
Contact us today for expert guidance and support throughout the planning process.
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