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Basements.

Basement Construction & Conversion Services in Surrey & West Sussex

At 5m2 Construction, we deliver practical, high-quality basement construction and cellar conversion services for homeowners across Surrey and West Sussex. Whether you are creating a brand-new basement or transforming an existing cellar, we design and build spaces that add real value and useful living space to your home.

From family rooms and guest suites to home gyms, cinemas and utility spaces, we create basements that feel like a natural extension of the property above.

Basement Services

  • New basement construction
  • Cellar and basement conversions
  • Basement waterproofing coordination
  • Structural alterations and excavation support
  • Lighting, layout and interior fit-out planning

How we Work

Basement projects require careful planning, technical understanding and disciplined project management. We take a measured, practical approach to every stage, helping clients make the most of the space while keeping buildability, drainage, waterproofing and structural considerations firmly in view.

By combining hands-on construction experience with clear communication and strong site management, we deliver basement spaces that are functional, beautifully finished and built to last.

Start your Basement Project

If you are planning a basement conversion or new underground space in Surrey or West Sussex, get in touch to discuss your ideas and see how we can help bring them to life.

Get in Touch