Basement Conversions
Thames Valley

Full basement excavation and conversion across Berkshire and the Thames Valley. Living space, gym, cinema room or home office below ground. Fixed price from £45,000.

Conversion Uses

What We Can Create

Living Space

Additional living room, playroom or open-plan family space. Full waterproofing, insulation, electrics and decoration.

From £45,000

Cinema or Gym

Dedicated cinema room or home gym. Acoustic insulation, specialist flooring, lighting design and full fit-out.

From £50,000

Home Office or Suite

A dedicated below-ground workspace or self-contained suite with bedroom, bathroom and living area.

From £55,000

What’s Included

Complete Package, Fixed Price

Free site visit and structural feasibility assessment
Structural engineer design and calculations
Building regulations application and sign-off
Excavation and underpinning works
Waterproofing system installation
Concrete floor and structural works
Insulation to walls, floor and ceiling
First and second fix electrics and plumbing
Plastering, flooring, joinery and decoration
Staircase design and installation
Natural light solutions — lightwells and glass floors
Weekly photo progress reports throughout

FAQs

Basement Conversion Questions

Do I need planning permission for a basement conversion?+

Most basement conversions of existing space fall under permitted development and do not require planning permission. New excavations may require planning in some areas. We advise at the free site visit.

How long does a basement conversion take?+

A basement conversion typically takes 16–24 weeks depending on the extent of excavation, waterproofing and fit-out required.

How much does a basement conversion add to property value?+

A well-executed basement conversion in Berkshire typically adds 15–25% to property value. In high-value areas such as Windsor and Maidenhead the return can be significantly higher.

Is my property suitable for a basement conversion?+

Suitability depends on ground conditions, existing foundations and proximity to neighbouring structures. We carry out a full structural feasibility assessment at the free site visit.

What waterproofing system do you use?+

We specify and install Type A, B and C waterproofing systems in accordance with BS 8102. The system is selected based on ground conditions and intended use of the space.

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