House Extension Architects in Edinburgh & Across the UK

At Matson Mourier, we design house extensions that feel effortless, well-considered and naturally integrated with your home. As experienced house extension architects based near Edinburgh and working across the UK, we help homeowners unlock the potential of their properties, whether that means creating more family space, adding bedrooms or improving the way rooms connect and flow.


Our approach combines thoughtful, design-led thinking with technical expertise, ensuring each extension complements your home’s architecture while supporting the way you live today. Discover how we can help you expand and enhance your home.

Types of Extensions We Design

  • Backyard patio with beige stone tiles, black wicker chairs, and a small building with a large open glass door leading into a living room with a gray sofa and windows overlooking a garden.

    Rear Extensions

    Ideal for creating larger kitchen-dining spaces, improving ground-floor layouts or enhancing the connection to the garden.

  • Backyard patio with potted plants, a tree, and a stone house with sliding glass doors and a window.

    Side Return Extensions

    Particularly suited to traditional homes with a narrow side area, allowing additional width and improved internal flow.

  • Modern house with large glass doors, dark gray steps, and a green lawn in the foreground.

    Two-Storey Extensions

    Add bedrooms, studies or family rooms over two levels, providing significant extra space with a cohesive external design.

  • Modern hotel room with a bed, grey armchair, and stone accent wall, visible through open sliding glass doors, with outdoor dining table on a patio, and a grassy lawn.

    Contemporary Glazed Extensions

    Thoughtfully designed glazed elements can boost light levels and improve garden connections. While full glass extensions can be more challenging due to current energy and heat-loss regulations, we can explore options that balance transparency, comfort and compliance.

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Modern kitchen and dining area with large glass sliding doors leading to a backyard with green lawn and trees

Why Invest in a House Extension?

A well-designed extension can transform the way you live without the upheaval of moving home. Many homeowners choose to extend to create more space for growing families, bring natural light into previously dark areas, or reconfigure layouts for modern open-plan living. Extensions also offer one of the most effective ways to add long-term value and flexibility to your property. We ensure every addition feels like a natural continuation of your existing home, blending architectural integrity with improved usability and flow.

Our Approach to House Extensions

We begin every project by understanding how you use your home and what you want to achieve. Our architects explore layout options, materials, natural light and overall flow to create designs that are both beautiful and practical.
With extensive experience across modern and period properties, as well as conservation areas and listed buildings, we ensure your extension is sensitive to context while meeting modern standards. We manage planning permissions, technical drawings and coordination from concept to completion, offering a clear, collaborative process throughout.

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Planning & Regulations

Navigating planning and building regulations can feel overwhelming, but we’re here to guide you through the process clearly and professionally. With extensive experience preparing applications across Edinburgh and the UK, we produce the drawings, statements and technical details needed for a robust submission.

For homes in conservation areas or listed buildings, we develop designs that respect the character of the property and align with local policy. While planning decisions always rest with the local authority, we help you put forward a well-considered, policy-aware proposal that stands the best chance of success.

Black and white photograph of a modern house exterior with trees and a sidewalk, alongside architectural blueprints of the house's floor plan, labeled with rooms and measurements.

View Our Residential Portfolio

Discover how our residential architects in Edinburgh and across Scotland bring ideas to life through luxury new builds, self build homes, refined refurbishments, and bespoke extensions.

View Our Portfolio

Start Your House Extension Project With Us.

If you’re considering extending your home, Matson Mourier can help you bring your ideas to life. Whether you’re looking for a contemporary addition or a carefully crafted heritage extension, we’ll guide you from initial concept through to completion with clarity and creativity.