Led by Design, Built with Care
HYBRID ANNEXE | ARCHITECTRUAL CLADDING | AVAILABLE NOW
●HYBRID ANNEXE DESIGNED FOR FLEXIBLE USE – IDEAL AS AN OFFICE, GYM, BEDROOM, WITH SECURE STORAGE, INTEGRATED SHOWER AND TOILET FACILITIES
A precision engineered steel frame and maintenance free aluminium cladding (available in a range of colours) form the core of this hybrid annexe.
Aluminium windows and doors specified to match the cladding RAL colour, galvanised gutters, and flush thresholds (including the patio) create a clean, durable, and accessible exterior with lasting performance and minimal upkeep.
‘It feels like was meant to be here’
A SMART HYBRID ANNEXE FOR A GROWING LONDON FAMILY
This hybrid garden annexe in London adds 430 square feet of practical, multi-functional space, an exceptional investment compared to local property prices. Designed for a young family, the annexe offers a private bedroom, home gym, secure storage, and integrated shower and toilet facilities.
Ideal for modern family life, this self-contained annexe serves as guest accommodation, a fitness space, and a flexible retreat for work or relaxation. With a design that maximises every inch, it adds both everyday utility and long-term value.
Whether you’re extending your home for lifestyle needs or planning ahead, a hybrid annexe is a smart way to expand in London without the cost of moving.
‘We found a good company who listened to what we wanted, ANX’
● PREFALZ® CLADDING
PREFALZ® by PREFA is a premium raised seam aluminium cladding system designed for roofs and façades. Lightweight (just 2.3 kg/m²) yet exceptionally durable, it’s ideal for complex shapes, curved structures, and uneven surfaces. More pliable than conventional metals, it offers creative freedom without compromising strength or coating quality.
With over 16 standard colours, smooth or stucco finishes, and full system accessories, it ensures seamless, weather resistant results. PREFALZ® is non-combustible (A1), corrosion resistant, and backed by a 40 year material and colour guarantee.
Made from recyclable aluminium—often up to 87% recycled it delivers long term sustainability and standout kerb appeal for annexes, extensions, and modern architecture.
● LIGHT GUAGE STEEL FRAME
Light Gauge Steel Frame (LGSF) systems offer a fast, sustainable, and durable solution for annexe, garden room, and modular home construction. Unlike traditional timber, LGSF enables precise, level installation—allowing for genuine step-free access that supports inclusive, future-proof design.
Manufactured offsite and assembled with speed and accuracy, LGSF structures reduce site disruption, cut construction times, and ensure consistent quality. Galvanised steel is non-combustible, pest-resistant, and won’t warp or rot, making it ideal for long-term performance in all UK conditions.
Lightweight yet strong, LGSF minimises foundation load while enabling flexible layouts and open-plan living. For high-spec, accessible annexes in the UK, LGSF delivers modern performance without compromise.
‘Everything is as it should be’
●DOORS & WINDOWS
To ensure visual coherence across the exterior, the aluminium windows and bifold doors were custom specified in the same RAL colour as the cladding. Each unit was fitted with integrated blinds, offering a discreet, low-maintenance alternative to traditional shading.
●SCREW PILES
This annexe was built on screw pile foundations, engineered for London clay and a nearby eucalyptus tree. Designed to avoid ground movement and root disruption, this low-impact solution is ideal for garden buildings on sensitive ground where traditional footings may fail.
●SERVICES
Fully compliant utility connections – waste, water, power, and data – were installed to UK Building Control standards. A soak away system ensures effective rainwater management. Professionally delivered and approved, these services provide long term comfort, safety, and performance.
●EXTERNAL PRECISION
Prefa raised seam aluminium cladding provides a sleek, modern exterior with lasting durability. A concealed AC condenser maintains clean lines, while a York stone path adds practical charm. The soft landscaping was completed with turf, topsoil, and planting, and eleven feature lights. Step-free access enhances usability, and a perimeter French drain ensures effective water management. Together, these details create a high-performance finish and long-term value.
●INTERNAL SIMPLICITY
The interior features a premium Bette, Duravit, and Crosswater bathroom suite with herringbone shower panels. Forbo Allura Wood flooring adds warmth, while Eternal Material in the store room offers durability. A 170L Megaflo pressurised water heater ensures performance. Hiatt Architectural fittings, bike storage, and dimmable LED strip lighting complete a refined, modern interior—designed for comfort, usability, and long-term value.
●BUILD
Light gauge steel frame was supplied by Steel Frame Buildings. ANX supplied all the trades required to complete every element of the build.
SERVICES ENGAGED
Building Control | Mobilisation | Ground | Joinery | Electrical | Decoration | Kitchen | Plumbing | Solar | Commissioning | Landscaping.
With planning and building control approvals secured, the final result is a standout example of thoughtful design and execution. The annexe sits sympathetically within the garden, meeting every aspect of the client’s brief while adding long-term value. It’s a timeless, multi-generational space, designed for daily living and future flexibility.
If you’re ready to design a building that truly reflects your needs, ambitions, and lifestyle, we’d love to help you bring it to life.
