Services
Basement Conversions
Unlock the hidden potential beneath your London home, from excavation and structure to bespoke fit-out.
London’s most sought-after homes go deeper.
In Knightsbridge, Chelsea, Belgravia and Kensington, basement conversions have become the defining way to add significant living space to a prime property. Where ground-floor extensions are limited by planning, and loft conversions constrained by roof geometry, a basement offers almost unlimited design freedom: below ground, hidden from neighbours, free from many permitted development restrictions.
Nomos Group manages the entire programme: structural survey and engineering, excavation and underpinning, tanking and waterproofing, then full M&E and interior fit-out. One team, one contract, one finished space.
Discuss Your Project →What We Deliver
- Full basement excavation and underpinning
- Structural engineering and waterproofing
- Natural light wells and lightwell glazing
- Home cinema and media rooms
- Private gym and wellness spaces
- Wine rooms and cellar design
- Guest suites and additional bedrooms
- M&E, underfloor heating and ventilation
- Smart home and AV integration
- Planning and party wall management
Basement works demand experience and precision.
01
Maximise your footprint
In prime London where lateral space is finite, a basement conversion can add 20–40% additional floor area without touching your garden or roofline.
02
Complex works, expertly managed
Basement excavation in London requires careful underpinning, waterproofing, structural engineering and party wall management. We handle all of it under one contract.
03
Bespoke to the last detail
From the structural shell to the cinema screen, every element is designed and delivered by our team, not subcontracted to a separate fit-out company.
What lies beneath is only limited by your brief.
Our clients have used basement conversions for home cinemas with Dolby Atmos sound, private gyms with sauna and steam rooms, wine cellars with tasting rooms, dedicated children’s play spaces, and self-contained guest suites.
Because the space is entirely new, there are no period features to work around and no constraints on ceiling heights, giving our design team a blank canvas to create something truly exceptional.
Thinking about a basement conversion?
Every site is different. Tell us about your property and we’ll arrange a feasibility discussion with our team.
Make an Enquiry