Basement conversion architects in Hampshire and Dorset.

We’re basement conversion architects based in Southampton, Portsmouth and Bournemouth. Delve into the transformative world of home renovation with GRK Architecture’s basement conversions, where underutilised space blossoms into realms of luxury, leisure, and creativity.

Elevating your home with our basement conversions.

Embarking on a basement conversion with GRK Architecture is an invitation to unlock hidden potential beneath your home’s surface, transforming underutilised space.

Picture a luxurious entertainment hub, complete with a state-of-the-art home theater and stylish bar, where memorable gatherings unfold in an atmosphere of sophistication and comfort. Perhaps you envision a tranquil spa retreat, where cascading water features and serene lighting create a sanctuary for relaxation and rejuvenation. Or, dare to dream of a versatile home office or creative studio, where innovation flourishes amidst sleek, modern design.

With GRK Architecture’s expertise, your basement becomes a canvas for inspired living, offering not just additional square footage, but a haven tailored to your unique desires and aspirations.

Unlock the full potential of your basement.

A basement conversion is one of the most powerful ways to expand your living space without altering the shape of your home. What may currently feel dark, cold or forgotten can be transformed into a warm, inviting and beautifully finished room that adds comfort, flexibility and long-term value.

For many homeowners, a basement opens up possibilities they never thought possible — a dedicated entertainment room, a peaceful home office, a playroom, a private gym, a guest suite or even a self-contained living space. Whatever you’re imagining, we help you explore how the basement can become a natural extension of your home, tailored to the way you live.

With thoughtful design, smart engineering and careful planning, we make the entire process feel clear and well-supported. From managing light and ventilation to navigating structural work and building regulations, every stage is handled with care so the end result feels effortless.

Book your free consultation.

Let’s explore the possibilities of your space and start the exciting journey of bringing your lifestyle aspirations to life.

Book your free consultation at your home or at one of our offices in Southampton, Bournemouth, Farnham, or Portsmouth.

We handle every aspect of your basement conversion with meticulous attention to detail.

Beyond aesthetics, we navigate complex planning regulations, ensuring your project meets all legal requirements while managing every detail of the process with precision and finesse.

Our goal is to provide a hassle-free experience, turning the complexity of building into a seamless journey. We treat every client like they are our only client, and we thrive on seeing our clients realising their dream home.

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Planning Permissions

Our team are here to help and advise you with all the planning regulations.

So, if you need a permitted development certificate or full planning permission, we can manage this whole process for you.

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Architectural Designs

Your vision and requirements lead the way and everything we design is bespoke for you.

We'll create a full suite of plan and 3D renders so that you can fully visualise and experience your dream home. 

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Technical Documentation

We meticulously create intricate architectural plans and specifications for the construction phase.

This ensures that every part of your vision is bought to life with precision and excellence.

Why homeowners choose GRK for basement conversions.

We go beyond designing your dream space, we offer comprehensive project management services. 

From liaising with local planning authorities and dealing with complex planning applications, all the way through to overseeing construction.

Our goal is to provide a hassle-free experience, turning the complexity of building into a seamless journey.

We treat every client like they are our only client, and we strive to improve the quality of your daily life with spaces that truly mean something to you.

Architectural design & inspiration

Costs & project planning

Planning permissions & building regulations