White basement kitchen with built-in ovens, stairs on the left and rear doors to a patio below garden level
Considerate Construction Scheme

Basement Conversions in Fulham

For an effortless basement conversion in Fulham, you need a team with impeccable standards and a proven track record of success.

Proficiency Design & Build unlocks the hidden potential beneath your South West London home.

Whether it's a cellar conversion or an elegant home office, we ensure your basement project blends seamlessly with your home's design.

Basement sitting area with wide timber front steps, straight rear-left stairs and a window into a lightwell on the right

In a city where space is limited, digging down is the new way up.

At Proficiency, our dedication to quality is backed by membership in some of the construction industry’s most reputable organisations.

Federation
of Master Builders

Our craftsmanship, track record, and financial stability have all been independently verified, providing clients with extra assurance of our professionalism.

Fully
Insured

Extensive public and employer’s liability insurance, giving you complete peace of mind from start to finish.

Considerate Constructors Scheme

Demonstrates our commitment to reducing environmental impact and minimising disruption to neighbours on every project.

Down Is The New Up: Use Basement Conversion Specialists

With over 8 million people living in London, space is a luxury. When moving isn't an option or upward expansion isn't viable, a basement conversion offers a smart, high-value solution for expanding your home.

With over 14 years of experience in The Big Smoke and surrounding areas, we strive to be a leading provider of sustainable and comprehensive basement conversion services.

Our team brings meticulous project management, detailed craftsmanship and collaborative structural engineering to your basement construction, delivering living spaces that align with your lifestyle.

Recognising that a basement conversion project is a significant investment, we prioritise clear communication and precision to achieve impressive results. Whether converting an existing basement or undertaking a new build, Proficiency Design & Build offers local expertise for your London basement conversion project.

Converted basement room with a beige corner sofa, fitted TV shelves, a kitchenette on the left and curved carpeted stairs on the right
Completed basement lounge with a rectangular hopper window, white structural posts and a TV between black speakers
Basement hallway with a sweeping staircase and access to two separate rooms and a timber-racked wine cellar

Design & Build
Basement PROCESS

Free On-Site Consultation

We start with a complimentary site visit at your property to assess feasibility, understand your requirements, and discuss potential layouts

Planning & Design

Our in-house architects create a custom design based on your vision. We handle planning permission applications and liaise with local authorities for smooth approvals.

Excavation & Structural Works

Our expert team excavates and reinforces your basement space, using underpinning or piling where necessary.

Waterproofing & Drainage Installation

Delta Membrane Systems provide long-term damp protection. We install drainage pumps and ventilation systems to maintain a dry, comfortable environment.

Fit-Out & Interior Completion

Bespoke finishes tailored to your style, from flooring to lighting. Full electrical, plumbing, and heating installations.

When you partner with Proficiency Design & Build, you're collaborating with experts in high-end basement construction.

LATEST PROJECTS

Light-filled kitchen extension at The Avenue with veined marble worktops and black-and-brass pendants
The Avenue, Queen's Park Rear and side extension View Project
Westbere Road kitchen interior with a pale island worktop and herringbone timber flooring
Wesbere Road, West Hampstead Kitchen Renovation See the Project
Cambridge Road kitchen lined with dark blue storage units with a white-topped island and timber breakfast bar
Cambridge Road, London Extension & Loft Conversion View Project
Conewood Street kitchen and adjoining dining nook with a pale pink island and brass-handled cabinetry
Conewood Street, Highbury Side Kitchen Extension View Project

Basement Conversion Fulham Costs

Typically, the average cost of London basement conversions ranges from £1,250 to £3,000 per square metre.

However, the final price tag can vary depending on the size and condition of your existing space, if basement excavation is needed, and the luxury finishes you choose to complete the look.

Basement conversion costs are inclusive of all architectural and structural work, such as construction, damp proofing, insulation, heating and electric.

With meticulous planning, our project managers and design teams transform your sub-level area into extraordinary living spaces.

Let Proficiency Design & Build deliver the top-quality service your home deserves!

WHY OUR BASEMENT COMPANY

  • Experienced Local Experts - Knowledge of Fulham’s Victorian and Edwardian properties ensures seamless approvals.
  • 20-Year Waterproofing Guarantee - Using Delta Membrane Systems for complete protection.
  • Planning Permission Experts - Proven success in securing approvals from Fulham’s local council.
  • Custom Design & Fit-Out - Tailor your basement for a gym, home cinema, wine cellar, extra bedroom, or office.

End-to-End project management from planning and excavation to waterproofing and interior finishing.

Building a room

Work With Industry Leaders Today

Undertaking a basement conversion in Fulhamis no easy feat. You require a specialised team that listens to your vision to ensure your dream home goals come to life. Transform your vision into reality with our high-quality construction services.

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