
Design & Build
Design & Build Services | Berkshire, Surrey & South of England
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At Katherine Jane Design Studio, our design-and-build service seamlessly integrates architectural design with interior expertise. We manage the entire process from initial concepts and planning permission through to construction and interior finishing delivering cohesive, beautifully executed projects under one roof.
Our Design & Build Process
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Feasibility & Site Analysis — We assess your property's potential, exploring architectural possibilities and spatial opportunities to maximise your home's footprint and functionality.
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Architectural Design — Our team develops detailed architectural drawings, structural plans, and elevations that respond to your site, your brief, and your vision for the space.
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Planning Permission & Building Regulations — We prepare and submit all planning applications, manage communications with local authorities, and ensure full compliance with building regulations throughout.
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Interior Design Integration — While developing the architecture, we design the interiors in parallel, ensuring every architectural decision enhances the interior spaces and vice versa.
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Transparent Costing & Programming — You receive detailed budget breakdowns and realistic timelines before work begins, with clear milestones throughout the build.
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Construction Management — We oversee the entire build, coordinating architects, structural engineers, contractors, and tradespeople to deliver exceptional quality on schedule.
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Final Finishes & Styling — From fixtures and fittings to furniture and styling, we complete every detail to create a fully realised, move-in-ready home.

Why Choose Our Design & Build Service?
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✓ Architectural Expertise — Structurally sound, beautifully proportioned spaces
✓ Seamless Integration — Architecture and interiors designed in harmony
✓ Single Point of Contact — One team managing everything from planning to handover
✓ Planning Confidence — Expert navigation of permissions and regulations
✓ Award-Finalist Quality — Recognised excellence in residential design
✓ Stress-Free Delivery — We handle complexity so you can focus on the excitement
Design & Build Projects: Home Extensions | New Build Homes | Loft Conversions | Basement Conversions | Side Returns | Rear Extensions | Wraparound Extensions | Garage Conversions | Structural Remodelling | Period Property Extensions
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Our integrated approach means your home's architecture and interiors are designed as one cohesive vision. The result is a thoughtfully crafted space where structure, light, flow, and aesthetics work in perfect harmony.
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Serving: Berkshire | Surrey | Hampshire | Oxfordshire | Buckinghamshire | South of England
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Ready to explore what's possible? Contact us to discuss your design & build project.
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