Single Storey Rear Extension, Loft Conversion and Flat Conversion Approved in Brent, HA0

Detailed Planning secured planning approval for a residential redevelopment project on Sudbury Avenue in Brent, HA0. The approved proposal included a single storey 6m rear extension, a loft conversion, and the conversion of the existing house into two self-contained flats. This project was carefully developed to increase internal floor area, improve the relationship with the rear garden, and create practical new homes with good levels of natural light and amenity.

As experienced architects in Brent, we provided a full planning-led architectural service, from design development through to the planning submission. Our team prepared the drawings, coordinated the supporting information, and managed the application process to help achieve a positive outcome.

If you are planning a house extension in London, a loft conversion, or the conversion of a property into flats, our architectural design services can help you assess feasibility, develop the scheme, and navigate the planning process with confidence.

Project Overview

This Brent project involved the transformation of an existing house to create two self-contained residential flats, while also extending and improving the building. The brief included:

• A single storey 6 metre rear extension to increase ground floor accommodation
• A loft conversion to create additional habitable space at roof level
• The conversion of the property into two flats with practical internal layouts
• Improved access to natural daylight and a better connection to the rear garden
• A planning strategy designed to respond to Brent Council policy and local context

The aim was not only to add space, but to create a well-considered design that worked both functionally and in planning terms. Our design process helped guide the client through each stage, from the early concept design to the final planning submission.

Design and Planning Strategy

The design was prepared with careful attention to scale, proportion, roof form and the relationship with neighbouring properties. The 6m rear extension was designed to provide valuable additional internal space while maintaining an appropriate relationship with the existing house and surrounding properties. The extension also helped improve the flow of the home and strengthen the connection with the garden.

The loft conversion was designed to sit comfortably within the roofscape and form part of a coherent overall scheme. Consideration was given to roof design, outlook, daylight and the impact on the appearance of the building, helping to ensure the proposal remained balanced and supportable.

A major part of the brief was the conversion of the house into two flats. This required thoughtful internal planning to create practical layouts, suitable accommodation, and good quality living environments for future occupants. The scheme was developed to make efficient use of the available volume while supporting residential amenity.

From a planning perspective, we assessed the key issues that often influence this type of development, including:

• Visual impact and design quality
• Neighbouring amenity, including privacy and outlook
• Daylight and natural ventilation
• The relationship between the extension, loft conversion and existing building
• The suitability of the proposed residential layouts

As experienced planning consultants and residential architectural designers, we prepared a planning-led scheme that balanced the client’s objectives with the relevant local planning considerations in Brent.

Architectural Services Provided

For this project, our team provided a comprehensive service including:

• Measured survey information review and design development
• Preparation of proposed architectural drawings
• Planning strategy and design advice
• Preparation of the planning application package
• Coordination of supporting documents
• Liaison during the planning application process

Our role was to create a clear, policy-aware proposal and assemble the information needed to support the application. This helped give the client a structured route from concept to approval.

Project Highlights

• Planning approval for a single storey 6m rear extension in Brent
• Approved loft conversion to create additional habitable accommodation
• Successful conversion of the house into two self-contained flats
• Planning-led design approach tailored to the site and local authority context
• Improved internal space, natural light and overall functionality
• Comprehensive architectural drawings and planning documents prepared for submission

Planning Outcome

Planning approval was secured in September 2025, allowing the client to move forward with confidence. The approved design unlocked the potential of the property by extending the building, creating additional accommodation in the roof, and enabling the conversion into two flats.

The result is a more efficient and valuable residential property that makes better use of the site while providing improved living accommodation and a stronger relationship to the rear garden.

Need Help with a Rear Extension, Loft Conversion or Flat Conversion?

If you are considering a rear extension in Brent, a loft conversion, or a house to flats conversion, Detailed Planning can help. We provide planning-led architectural support for homeowners, landlords and developers looking to improve, extend or reconfigure residential property.

Learn more about our services for home owners, or explore how we can help with planning permission in London.

Project reference: 2477SD_FUL

Next steps: If you would like to discuss your own extension, loft conversion or flat conversion project, schedule a call with our team.

Explore more examples in our Approved Projects gallery.