Basement Conversion
Through a unique combination of engineering, construction and design disciplines and expertise.
Welcome to Studio20 Architects London
A downward expansion offers the ultimate design freedom, allowing you to create an expansive, high-value space without sacrificing a single inch of your garden, which is a key advantage given the premium on space in London. While highly rewarding, executing a Basement Conversion Specialist project is extremely intricate, involving sensitive excavation, extensive underpinning of existing foundations, and navigating complex issues like wet soil or hidden streams.
These challenges demand expert management. We engage seasoned architects and structural engineers from day one, ensuring the layout is delicately planned, and critical challenges like strong waterproofing for a dry subterranean space are proactively addressed, alongside total adherence to stringent planning laws. We are the Basement Conversion Company, dedicated to transforming complex underground visions into structurally safe and stunning realities.
Types Of Basement Conversions
The scope of your underground project depends on your property and design ambitions. Our Basement Conversion services cover custom solutions to maximise your home’s potential:
- Complete Basement: This allows you to unlock significant living space beneath your entire home, which is perfect for dense urban areas where above-ground expansion is limited. The resulting space is ideal for a home cinema, gym, or guest suite, without altering your property’s exterior appearance.
- Garden Basement: By extending beneath your garden, this option provides privacy and utilises lightwells to create a bright, tranquil, and highly valuable space, elevating your home through sophisticated Basement Conversions London.
Our Basement Project Process
Expanding/converting your basement starts with checking your site, structure, and planning rules. As a top Basement Conversion Company, our architects design a bespoke layout that maximises space, daylight, and ventilation, ensuring compliance with local building and waterproofing regulations.
We handle all paperwork (drawings, applications, and structural calculations) for quick approval. We meticulously oversee excavation, underpinning, and installation, covering crucial insulation and the final fitting out of the space. Safety and quality are key to delivering a high-value basement conversion that transforms your home.
Planning Permissions For Basement Conversions
Securing council approval for your project can be complex, but as a Basement Conversion Specialist and RIBA chartered practice, we make it simple. Our experienced designers and planners create smart strategies to ensure your project complies with all statutory requirements and is approved with ease. We manage all architectural planning, guaranteeing a compliant layout that unlocks your space’s potential. We provide excellent service, guiding you through every step. Contact our Basement Conversion Company today for a consultation and a free quote.
Basement Conversion Services We Provide
If you’re considering basement services, get in touch to arrange a free consultation at our studio and discover how we can transform your underutilised space into a stylish, functional, and valuable extension of your home.
A basement conversion is, by far, the most creative method to extend the living area and raise the value of a property in London. With their know-how and knowledge of the city, our architects turn the dreary and dark lower-ground areas into unique spaces of all kinds, from fitness rooms to cozy guest rooms and swimming pools. We enhance your lifestyle while preserving your outdoor area. The best approach depends on your property.
Complete Home Conversion
This is the most extensive conversion project, which involves excavating beneath the entire footprint of the house (and any existing extensions). It is ideal for creating prominent features like swimming pools or adding a significant amount of new, high-value living space.
Cellar Conversion
Garden Conversion
This project involves constructing a new underground structure beneath the garden, separate from the main property. This basement conversion creates flexible space for a cinema or home office while causing less disruption to the main house during the build phase.
Get A Free Quote For Basement Conversions
If you’re thinking about transforming your basement, our trusted basement conversion company is here to guide you every step of the way. We’ll arrange an initial consultation at a time that’s convenient for you, whether you already have ideas or need professional guidance.
During the consultation, our experts will carefully listen to your requirements, provide tailored advice, and offer a detailed, no-obligation free quote for your project. Contact us today by phone or email to get started.
Frequently Asked Questions About Basement Conversion
Most basement conversions in London can be done under permitted development. Listed or conservation properties require full planning permission. Our specialists assess feasibility, prepare accurate plans, and manage the process to increase your project’s approval chances.
Our basement conversion specialists follow BS8102 waterproofing standards, integrating systems like Type C cavity drains. Combined with structural reinforcement, insulation, and ventilation, we ensure your basement is dry, safe, and compliant.
Typical basement conversions take 6–9 months from survey to completion. This includes site survey, planning, structural design, building regulations, and construction, managed efficiently by our experienced team.
Partial conversions may allow you to stay. Major excavations usually require temporary relocation. Our basement conversion specialists advise on safety, comfort, and practical timelines for your property.
Yes. A well-designed basement conversion can boost property value up to 20% while creating functional spaces like gyms, home offices, cinemas, or guest suites.
Our free £350 basement conversion company site survey includes property assessment, feasibility advice, and preliminary design options, giving you a clear understanding before committing.
Yes. Projects like Islington St Luke’s basement conversion show our ability to transform historic spaces while preserving character, integrating sustainable practices, and ensuring compliance with regulations.
We design multi-functional areas: home offices, gyms & wellness spaces, entertainment/cinema rooms, guest suites, wine cellars, and multi-generational living, tailored to lifestyle and property needs.