A Collaboration Between Design and Innovation
When architect and television presenter George Clarke needed a decking specialist for Channel 4’s Ugly House to Lovely House, there was only one choice — Karl Harrison, decking designer and consultant at Exterior Solutions Ltd.
The challenge? To transform a dated property with a state-of-the-art outdoor terrace that combined architectural precision, visual elegance, and long-term durability — all within a strict budget.
By pairing Accoya® decking with the innovative Exterpark Magnet system, Harrison created a seamless, screwless terrace solution that perfectly balanced aesthetics, performance, and practicality.
From Concept to Reality
The architect’s initial design called for a substantial glass and stainless-steel terrace with a cantilevered structure — an impressive vision, but one that exceeded the project’s overall budget.
“I think we need a decking expert,” said George Clarke.
That’s when Karl Harrison was brought in to reimagine the concept — without compromise. By replacing the heavy stainless-steel framework with a lightweight timber and aluminium substructure, Harrison managed to achieve the same “floating” visual effect while reducing the cost by approximately 80%.
The new design not only met budget requirements but also enhanced the outdoor space’s functionality, introducing multiple zones for dining, lounging, and entertaining.
The Design: Seamless Transitions and Zoned Living
The decking layout evolved to create a versatile, multi-level outdoor living space.
The upper terrace provides a relaxed lounge area, while the lower level was extended to include a formal dining area. Smart angular adjustments allowed for smooth transitions between each section, removing the need for steps and maintaining a sense of flow across the terrace.
“No compromise needed here,” explains Harrison, a phrase that has become synonymous with his approach to complex architectural decking projects.
To achieve the illusion of a floating platform, the structural supports were coated in a black solid colour stain by Owatrol, visually blending them with the shadows below the deck. This detailing allowed the light grey decking surface to appear weightless — a subtle yet striking design move that perfectly complemented the home’s contemporary aesthetic.
The Engineering: Lightweight, Durable and Sustainable
Beneath the surface, precision engineering played an equally important role. The design accounted for both dead load (including a 1,200kg balustrade system) and live load, calculated at 4kN/m² to meet structural standards.
The subframe, made from aluminium profiles supplied by Exterpark, ensured rigidity and long-term stability while keeping the structure lightweight.
The Exterpark Magnet decking system was selected not only for its performance but also for its refined finish — a completely screwless system that delivers a flawless surface without visible fixings.
Exterpark Magnet System: The Screwless Solution
The Exterpark Magnet system uses an ingenious aluminium track and clip mechanism to secure decking boards in place. The result is a clean, uninterrupted finish that can be installed and removed in a fraction of the time required for traditional systems.
Key Advantages of Exterpark Magnet Decking:
No visible screws or fixings – sleek, seamless appearance
Fast installation – tracks and clips secure easily in place
Easy maintenance – boards can be removed in seconds for access beneath the deck
Precision fit – engineered tolerances ensure consistent spacing and alignment
This system made it possible to complete the subframe installation in under a day — an impressive turnaround for a terrace of this size and complexity.
Accoya®: Beauty That Lasts a Lifetime
For the decking material itself, there was only one real choice — Accoya®.
Made using a patented acetylation process, Accoya® is a high-performance modified timber that offers exceptional durability, dimensional stability, and sustainability. It’s warranted for 50 years against rot above ground and 25 years below, making it one of the most reliable materials on the market for exterior applications.
Accoya® starts as a naturally pale blond timber, which can be left untreated to weather gracefully or finished in a wide range of colours. For this project, Karl Harrison selected a bespoke light grey finish, complementing the home’s modern architectural lines.
The decking was treated using Owatrol marine-grade products, known for their durability and UV resistance. The chosen Solid Colour Stain offers five years of protection against peeling and fading, ensuring minimal maintenance and long-lasting beauty.
The Result: From Ugly House to Exceptional Home
The finished terrace exceeded expectations. The combination of Accoya® decking and the Exterpark Magnet system achieved a stunning, contemporary aesthetic while maintaining the project’s structural and financial parameters.
“By simplifying the materials and focusing on design integrity, we created something both practical and beautiful,” says Harrison.
The terrace now serves as a multifunctional outdoor space, seamlessly connecting the home’s interior to the garden and providing the family with areas to relax, entertain, and dine al fresco.
This project demonstrates how intelligent design and innovative materials can turn even the most ambitious ideas into reality — sustainably, efficiently, and without compromise.
Credit: Amazing Productions and Channel 4 picture’s.
Why Choose Accoya® and Exterpark from Exterior Solutions Ltd?
At Exterior Solutions Ltd, we are proud to supply Accoya® decking, Exterpark systems, and other high-end exterior materials for architects, designers, and construction professionals.
We combine decades of experience with a commitment to sustainability, providing products that enhance both aesthetics and performance in every project.
If you’re looking to create a distinctive, durable, and maintenance-friendly decking design, our expert team can help you specify the right system for your project.
Get in touch today to learn more about our Accoya® and Exterpark decking systems, or visit our website to explore our latest case studies.
