Basement Conversions
Unlock valuable living space below ground — gyms, offices, playrooms or media suites — delivered with expert waterproofing, structure and ventilation across London.
Dry, warm and beautifully finished
Basements demand the right system from day one. We integrate structural works, waterproofing (Type A/B/C), ventilation and electrics with premium finishes for a space that feels like the rest of your home.
Specialist Waterproofing
Tanked or cavity-drain (with sump/pumps) specified to site conditions.
Structural Expertise
Underpinning, light-wells, slab lowering and steelwork coordinated.
Healthy Air
Mechanical ventilation/heat recovery (MVHR) and humidity control.
Premium Fit-Out
Joinery, bathrooms, media wiring and acoustic treatments included.
What your basement can become
Family Room / Cinema
Acoustic treatment, media wiring and dimmable lighting.
Home Gym
Rubber floors, reinforced pads, ventilation and mirrors.
Office / Studio
Daylight via light-wells, task lighting and smart storage.
Guest Suite
Bedroom with ensuite, egress compliance and quiet comfort.
What’s included
- Surveys, temporary works, underpinning & slab lowering
- Light-wells, drainage runs, pumps & back-up alarms
- Waterproofing system (Type A/B/C) & cavity-drain membranes
- Thermal & acoustic insulation, studwork & plastering
- MEP: electrics, lighting, ventilation/MVHR, plumbing & heating
- Windows/egress, doors, bespoke joinery & storage
- Bathrooms/ensuites, tiling, flooring & decorations
- QA, warranties, manuals & Building Control sign-off
How a basement project runs
Feasibility & Quote
Review structure, water table and access; issue an itemised quote.
Design & Approvals
Structural calcs, waterproofing spec, light-wells and permissions.
Construction & Fit-Out
Underpinning, membranes, MEP, joinery and finishes to a high standard.
Sign-off & Aftercare
Testing, handover pack, warranties and optional maintenance.
Typical on-site build windows: 10–20+ weeks depending on scope and structural complexity.
Recent Basement Projects
A snapshot of our basement conversions across Greater London.
Basement – FAQs
Will my basement be dry?
Yes — we specify the correct waterproofing system for your site and provide maintenance guidance for pumps (if used).
Do I need planning permission?
Light-wells and external changes may require planning. We’ll advise, coordinate permissions and liaise with Building Control.
How do you ventilate basements?
Mechanical extract or MVHR keeps air fresh, controls humidity and improves comfort year-round.
Can you lower floors to increase head height?
Yes — subject to structure and drainage we can excavate, lower slabs and underpin to achieve comfortable heights.
Ready to convert your basement?
Share your plans and we’ll provide a clear, no-obligation proposal and timeline.