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Specialist in Basements, Extensions, and Loft Conversions

Town Houses
Town Houses

Our Services

    Undercroft Construction is a specialist in basement, extension, and loft conversions. Our services include comprehensive basement construction, high-quality extension projects, and bespoke loft conversions that maximize space and functionality.

Expertise in bespoke construction

Professional and highly experienced Team

Exceptional Quality

Sustainability & Accountability

About Us

Undercroft Construction

Undercroft Construction is a specialist basement, extension, and loft conversion company operating in the South East of England predominately between London and Cambridge. We are dedicated to delivering high-quality construction solutions that exceed expectations. Our team is committed to excellence, sustainability, and customer satisfaction.

Our Projects

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Testimonials

Customer Testimonials

Mr & Mrs W

Absolutly fantastic from the first meet to final handover. The finished space was exactly what we are looking for. 

Mr G - N16

Very professional team, had to overcome some very challenging logistical issues and delivered on time and budget.
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