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Mansard roof extension, part two part one storey rear extensions, installation of dormer windows

Development Type

Roof extension/ loft conversion
Double storey extension

Borough

Tower Hamlets

233 - 235 Bethnal Green Road, E2 6AB

Development Type

Mansard roof extension, double storey rear extension

 

Proposed Development

Proposed mansard roof extension, part 1 part 2 storey rear extensions, installation of x4 dormer windows and alterations to fenestration within the rear elevation. 

 

4D Planning's role

4D Planning assessed the feasibility of the possibility to extend the three storey mid-terraced building. We researched the planning history, planning policies and planning precedent amongst other searches and analysis of planning considerations. We concluded that there was potential to extend the roof space to create a large mansard roof and to extend to the rear, part double story and part single storey. The extensions would reflect other extensions that were carried out along the terrace and would respect the immediate neighbours amenity and the wider character of the terrace.

4D Planning were instructed to prepare the application and to liaise with the council. 4D Planning also produced the floor plans, sections and elevations and the maps for the submission. We negotiated with Tower Hamlets Council on the design and impact on neighbours and we managed to persuade the case officer that our proposal was in fact well thought out and suitable for this property. We were granted permission twice. The first time was for No. 235 Bethnal Green Road, but then the owner of the neighbouring property at No. 233 contacted us asking if we can apply for them together with No. 235 for an even larger extension.  

 

 

Understanding Planning Permission for a Mansard Roof Extension and Rear Extensions

Adding a mansard roof extension and rear extensions in Tower Hamlets requires careful navigation of the borough’s strict planning policies. These types of extensions can significantly increase living space, but compliance with Tower Hamlets Council’s design and character guidelines is essential.

 

Design and Character Considerations for a Mansard Roof Extension and Rear Extensions

Tower Hamlets Council places great emphasis on maintaining the historic character of its streetscapes. According to the Mansard Roof Design Guidelines, mansard roof extensions should be designed in a traditional form, maintaining uniformity with neighboring properties. Key considerations include setting back the extension from the roof edge, ensuring an appropriate roof pitch, and using high-quality materials that complement the existing architecture.


For rear extensions, Tower Hamlets encourages designs that are subordinate to the original building. Large-scale, dominant extensions are often resisted and are considered overdevelopment, especially in conservation areas. The height, bulk, and external materials must be in harmony with the existing property and surrounding buildings.

 

Neighbour Considerations for a Mansard Roof Extension and Rear Extensions

One of the main challenges with obtaining planning permission for a mansard roof extension and rear extensions is addressing potential concerns from neighboring properties. The council carefully evaluates whether the proposal impacts privacy, natural light, and the overall amenity of nearby residents. Overshadowing, loss of daylight, and intrusive overlooking can lead to objections and planning refusals.


To improve the chances of approval, applicants should provide detailed design plans demonstrating how the extension will minimise adverse impacts on neighbours. A sunlight and daylight assessment may be beneficial to support the application.

 

Permitted Development vs. Full Planning Permission for a Mansard Roof Extension and Rear Extensions


While some minor rear extensions may fall under permitted development (PD) rights, mansard roof extensions typically require full planning permission. Tower Hamlets Council assesses applications based on their compliance with local planning policies and the impact on the streetscape and neighbouring properties. Homeowners should check whether their property is in a conservation area or has existing extensions, as these factors may affect PD rights.

 

Ensuring Approval for a Mansard Roof Extension and Rear Extensions in Tower Hamlets

Given the complexity of planning policies, a well-prepared application is crucial for securing approval. Working with an experienced planning consultant can help ensure the design meets Tower Hamlets’ requirements. By addressing design integrity, neighbour concerns, and conservation policies early in the process, applicants can improve their chances of a successful planning outcome while enhancing their home’s functionality and aesthetic appeal.

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