House extension design
We design house extensions for residential properties in London and the home counties, considering layout, light, planning requirements, and buildability from the outset. Each project is approached holistically, from early design through to construction information.
Design​
The design stage focuses on how the extension will function as part of the existing home. We consider layout, circulation, daylight, and how new spaces connect to the original building, ensuring proposals feel coherent and well resolved.
Planning​
Where planning permission is required, proposals are developed with local policy, context, and common planning considerations in mind. This includes scale, appearance, impact on neighbours, and site-specific constraints.
Building regulations and technical designO
Once the design is established, detailed drawings are prepared to address building regulations requirements. These drawings coordinate structure, insulation, fire safety, and construction detail to support compliance and buildability on site.
Buildability and construction​
Design decisions are informed by how the extension will be built. Clear, coordinated information supports accurate pricing and reduces uncertainty during construction.
Costs & budgeting​
While we do not provide construction costs, we design with realistic budgets in mind. Early decisions around layout, structure, and materials can significantly influence overall build cost.
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Do all house extensions need planning permission?
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How long does a typical house extension design process take?
Who this service is suited to​
This service is typically suited to homeowners seeking a considered extension that integrates well with their existing property and is supported by a clear design and technical process.
Related services​
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planning applications
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building regulations drawings
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structural design
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party wall services
Start a project
If you’re considering an extension, conversion, or residential refurbishment, we’d be happy to discuss your project and outline. Next steps → Start a project