In London, where space is the ultimate commodity, the final frontier for expansion lies directly beneath your feet. A Basement Conversion London is more than an addition; it is an act of creation, transforming the very foundations of your home into a breathtaking new storey. This is the art of architectural innovation, creating vast, versatile, and light-filled spaces that were previously unimaginable. Our mission is to engineer and deliver Luxury Basement Conversions that seamlessly integrate with your home while offering a world of new possibilities – from state-of-the-art home cinemas and private wellness suites to expansive family rooms and bespoke wine cellars.
We are a team of dedicated specialists who understand the intricate science behind subterranean construction. A successful basement project hinges on meticulous structural engineering, flawless waterproofing, and intelligent design. Our integrated Design & Build process is engineered to de-risk this complex undertaking, providing absolute certainty on costs, timelines, and outcomes. We manage every detail, from the initial geological surveys and the complex process of Digging Out Basement UK soil, to the final, exquisite finishes. We believe a basement is a blank canvas for your most ambitious ideas, and we have the expertise to bring that vision to life with unparalleled precision and flair.
A Basement Extension London is a significant feat of engineering that requires a far more rigorous process than other types of home improvement. Our proven methodology is designed to manage the unique complexities of subterranean work, ensuring total safety for your property and complete peace of mind for you. We believe in absolute transparency, guiding you through each critical stage of the construction journey.
A basement isn’t just extra square footage; it’s a blank canvas for your most ambitious lifestyle goals. Our expert Basement Builders London specialise in creating dedicated spaces that enrich your life and transform how you enjoy your home.
From renovating an existing cellar to creating a multi-level subterranean extension, our expertise covers all forms of basement construction.
The most common project for properties with no existing cellar. It involves Digging Out Basement UK soil from beneath the entire footprint of your home, and often extending under the garden, to create a vast new level. This option offers a blank canvas on which our team can design any space you desire, from a family living area to a private swimming pool, home gym, or a truly bespoke cinema complex.
For properties with an existing cellar, a Basement Renovation London is the ideal solution. This project involves deepening the existing space to achieve great ceiling heights, undertaking full Waterproof Basement Construction, and professionally fitting out the area to transform it from a damp storage space into a warm, dry, and valuable part of your home.
Many London properties have a lower ground floor that is often dark and underutilised. A Lower Ground Floor Conversion focuses on reconfiguring and refurbishing this space. This involves significant structural changes to improve the layout, maximising the natural light with larger windows or light wells, and fully solving any damp issues using modern techniques to create a bright and premium living area.
For ultimate luxury and space creation, we offer multi-level basement construction. This ambitious project involves digging two or more floors beneath your property, creating a vast subterranean domain. It allows superb separation of functions, like entertainment on one level and a wellness suite on another. This is the pinnacle of Luxury Basement Conversions, requiring deep engineering expertise.
Before any design or construction work begins, we start with a detailed digital survey of your property. Using advanced scanning tools, we capture accurate measurements and convert them into a precise 3D model – known as Scan to BIM.
This process allows you to:
Our 3D scanning technology doesn’t just support design and construction – it also creates stunning virtual tours. Whether you’re planning, promoting or presenting a space, we deliver high-resolution digital walkthroughs straight from the same scan used for your BIM model.
Beyond the immediate lifestyle upgrade, a professionally executed basement conversion offers significant, long-term practical and financial advantages for your London property.
In the London property market, square footage is king. A Basement Conversion London adds a substantial amount of habitable floor space, directly translating to a significant increase in your property’s value. In many cases, the value added by a high-quality, well-designed basement will exceed the total cost of the project, making it one of the most financially sound investments you can make in your home. It’s not just an expense; it’s an asset that grows over time.
This is a critical advantage in a dense urban environment. Unlike a traditional extension, a Basement Extension London allows you to gain vast amounts of space without sacrificing any of your precious garden, patio, or outdoor living area. This new level is perfect for housing practical rooms like a large utility room, a plant room for the home’s services, secure storage, or even a subterranean garage with a car lift, thus freeing up your ground floor for more elegant, open-plan living.
A basement doesn’t exist in isolation; it can fundamentally improve the architecture of your entire home. By relocating functional or family spaces below ground, you can completely reconfigure the ground floor. Imagine removing a downstairs WC and utility room to create a magnificent, seamless kitchen and living area that flows directly into the garden. This is a common goal in a Lower Ground Floor Conversion, where improving the flow is paramount.
The challenges of modern life require modern solutions. Our Luxury Basement Conversions are a blank canvas to solve these problems. We can engineer secure, climate-controlled environments for storing fine art or valuable collections. We can construct sound-proofed music rooms or create dedicated server rooms for integrated smart-home technology. As expert Basement Builders London, we have the capability to deliver these highly technical, bespoke solutions with precision.
Find clear, expert answers to the most common questions about undertaking a Basement Conversion London.
Yes, almost certainly. Any project that involves major excavation, such as a new Basement Extension London, will require full planning permission. Local councils in London have very specific and often strict policies regarding basements, covering aspects like size, light wells, and construction impact. A simpler Basement Renovation London of an existing cellar may sometimes fall under Permitted Development, but we always advise assuming planning is needed. Our team manages this entire process for you.
Absolutely. Your property's safety is our highest priority. The entire process of Digging Out Basement UK soil and underpinning is meticulously planned and overseen by qualified structural engineers. We work in a sequenced, highly controlled manner, securing each section of the foundation before moving to the next. Your home is safely supported on the new, deeper foundations throughout the entire process.
This is a key part of our design process. We use a variety of techniques to ensure Luxury Basement Conversions are bright and welcoming. These include large, walk-on structural glass panels set into the garden or patio above, light wells (glazed courtyards), and beautifully designed staircases with glass balustrades that allow light to filter down from the floors above.
Our Waterproof Basement Construction comes with a 10-year guarantee, which can also be independently insured for added protection. The cavity drain membrane systems and pumps we install also come with their own long-term manufacturer warranties. We provide a full handover pack with all documentation and certification for your records.
A basement is a more complex project than other types of conversions. A straightforward Basement Renovation London might take 4-6 months. A full new Basement Extension London, including excavation, can take anywhere from 8 to 18 months, depending on the size, complexity, and ground conditions.
This is a common concern for London homeowners. We use a highly efficient logistics system. Typically, a small opening is created in the front of the property, and a system of conveyor belts is installed to carry the soil directly from the basement into a waiting lorry. This method is surprisingly clean, quiet, and minimises disruption to you and your neighbours.
This is the first step towards creating an extraordinary new space beneath your home. Please use the form below to tell us a little about your property and your vision.
Any details you can provide, such as the intended use (e.g., home gym, cinema, family room) or if you have an existing cellar, are very helpful. A member of our basement specialist team will be in touch within one working day to schedule your free, no-obligation site survey.
Reltic is a design and build studio creating smart, beautifully crafted homes.
020 3576 2851
office@reltic.co
4th Floor, Silverstream House, 45 Fitzroy St, London W1T 6EB
