hup! Building System
Experience a Home Transformation with the hup! Building System
Say goodbye to messy, drawn-out building projects. At Window-Mart, we’re proud to offer the hup! building system, a revolutionary way to extend or upgrade your home with less hassle and more benefits.
Faster to build, warmer to live in, and better for the planet, hup! is the future of home extensions.
🟢 Built in weeks, not months
🟢 Five times more energy efficient
🟢 Designed and manufactured in the UK
Why Choose the hup! System?
Use hup! to create extensions, garden rooms, or transform an old conservatory.
Each hup! project is precision-engineered for a high-quality finish, and fits your lifestyle, and your home.
🟢 Fast – Built in weeks, not months
🟢 Energy Efficient – Five times more thermally efficient than the average UK home
🟢 Eco-Friendly – 60% less carbon than traditional brick builds
🟢 Flexible Design – Works with any wall finishes, windows, and doors
🟢 Hassle-Free – One team, one project, no architects needed
🟢 Trusted Technology – Manufactured by Ultraframe, BBA approved
Contact us Today for your free quotation!
What Is the hup! Building System?
The hup! system uses pre-fabricated insulated panels that slot together to create walls, roofs, and even full extensions, all with minimal disruption to your home.
Whether you’re upgrading a conservatory or building a brand-new space, hup! is fast, strong, and future-proof.
Key Features:
Works with flat, glass, hybrid, or tiled roofs
Compatible with any finish – brick, render, cladding
Solid walls with U-values as low as 0.17 W/m²K
Ready to Build the Better Way?
Get in touch to explore your hup! project with the Window-Mart team.
We’ll guide you through design ideas, pricing, and timelines, with no obligation.
Get a Quote
or
Download the Brochure
“hup! is an absolute game changer” – Laura Jane Clark, Leading Architect & Star of BBC’s Your Home Made Perfect
Frequently Asked Questions
Yes! hup! is lightweight enough to be built on most existing bases, saving you time and money.
Most hup! projects are built in weeks rather than months, watertight in just days.
Absolutely. hup! walls are five times more thermally efficient than the average UK home and outperform brickwork.
Yes, all hup! components are Building Regulation compliant and backed by Ultraframe’s certification.
Home offices, family rooms, kitchen extensions, hobby spaces, hup! adapts to your needs.
Would you like to see our range of brochures?
Gallery
Why Choose Us?
Price Match Guarantee
Our Price Match Guarantee means we will match any like for like quotation with the same features, specifications and warranties.
All Seasons Living
Combine the light and airy feel of a conservatory, yet with the solid, tiled roof, and energy efficiency of an extension.
Over 50 Front Doors
We have a wide range of over 50 white, coloured & woodgrained Front PVCu and Composite Doors to choose from. Starting from just £645.
FREE Quotation
Whatever your requirements, please contact us now for a comprehensive FREE no obligation quotation, or just for some friendly advice.
Best Price Promise GUARANTEE*
*Provide us with a Like for Like quotation with the same features, specifications and warranties from a comparable company,and we will match the PRICE.
Call us on Now 01403 711 936
Email: info@window-mart.co.uk
Do you need a quote?
About
Established in 1998, Window Mart have gone from strength to strength culminating in the opening of our new show complex at Old Barn Garden Centre near Horsham. All Window Mart staff are employed by the company and drive fully equipped company vehicles. We have our own building team for groundwork and brickwork. In our showroom an extensive range of conservatories, doors and windows can be viewed. Excellence is our commitment and we are here to make sure you get the very best in service and quality.
hup! is a registered trademark of Ultraframe (UK) Ltd.
Contact Us
01403 711 936
info@window-mart.co.uk
Show Complex
Old Barn Garden Centre,
Worthing Road, Dial Post,
Horsham, West Sussex,
RH13 8NR
Opening times:
Mon -Sat: 10am – 4pm
Sunday: 11.30am – 3.30pm