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Revolutionary Extensions in Littlehampton & West Sussex

The better way to build

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Ultimate Design Flexibility

Being compatible with five different roofing options, including any door, window and wall designs, hup! extensions gives you total control over your extension from start to finish..

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Five Times Faster Turnaround

We can complete extensions in significantly less time than conventional building methods. Allow your new home improvement project to benefit from hup!’s rapid connection technology.

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Five Times More Energy Efficient

Benefit from lower energy bills and carbon footprints with the help of hup!’s innovative design. The material’s excellent levels of thermal retention will keep your Littlehampton or West Sussex home warmer and greener for years to come.

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Simply Better Quality

Representing the highest level of engineering technology, hup! uses advanced design and manufacturing software and made-to-measure components for a perfect fit every time.

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One Supplier, One Project

Gone are the days of stressful and messy installations. With hup!, your extension will be constructed in full by one dedicated team, so you won’t have to worry about multiple strangers or untidy use of your Littlehampton or West Sussex home.

60% More Carbon Efficient

hup! is 60% more carbon efficient than a brick wall with zero waste in production and no site waste to dispose of. Ongoing fuel consumption and carbon emissions are also lower than a brick wall, thanks to its superior thermal performance.

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Energy Efficient hup! Extensions

Get Your Designs

Enjoy the benefits of the incredible thermal efficiency that hup! has to offer. Not only will you be able to enjoy a living space that is warm during the colder months, but you may also be able to enjoy lowered utility bills from not having to rely on your central heating as much. Make your home more comfortable with hup! today.

Get 3 FREE designs in 2 simple steps.

Find the perfect living space for your home with our user-friendly conservatory contact form. No matter what design you’re looking for, you can find the ideal designs for your home with our services.
Step 1

Select Your Favourite Designs

Select your favourite designs, send us a photo of the back of your home, and we’ll send you three personalised living spaces superimposed onto the pictures you send us.
Step 2

Choose Contact Method

We offer a variety of ways to get in touch with us for our living space designing services. Whether you prefer to message, email or call, you can choose the right method for you below.
Chat On WhatsApp
Request Callback
Submit Enquiry
Step 3

Enter Your Details

As you’ve selected to request a call or email, we’ll need some additional information from you to start the design process.
Final Step

Thank You! We’ll Be In Touch Shortly

Thank you for submitting your request. We look forward to working on your dream living space project with you.

What Happens Next?

Picking your favourite designs is just the start of your dream living space. Now that we’ve received your contact request and favourite designs, we’ll be in touch to assist you with our superimposed images. We look forward to hearing from you!

Why Choose Us?

Since 1982, we’ve developed a knack for high-quality work, with even higher quality customer service, so you’ll never need to worry when you’re with Britannia.

See Our Before & After

Want to see how we can transform your old conservatory? View our before and after photos here!
ISO 9001
Made in Britain
National Warranties
Sabik Marine

Available Online, In-Store or At Home

Experience the freedom of obtaining the products you desire, tailored to your preferences. Our dedicated team is always available to assist you whenever you require assistance. Your satisfaction is our priority.

Explore hup! in more detail

hup! technology explained

Featuring the latest technology in the Littlehampton and West Sussex home extension industry, hup! extensions are one of the most revolutionary systems on the market. Choose from our range of durable models and enjoy five times the energy efficiency and installation times than traditional extensions. Get in touch, and we can kickstart your hup! extension today.

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hup! Conservatory Transformations

Transform and upgrade your old conservatory into a brand new stunning hup! extension for your home.

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hup! Extensions

Boost the value and open up the space of your home with the help of our simple and fast hup! extension projects.

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hup! Conservatories

Flood your home with stunning lighting and thermal insulation with a bespoke hup! conservatory.

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hup! Garden Homes

Create a space where you can enjoy the exterior of your home with guests or alone with our stunning hup! garden homes.

Ultimate design flexibility

Interactive hup! Brochure

Happy Customers

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© 2024 Kayvex Windows. All rights reserved

Network Britannia Windows Limited t/a Kayvex Windows is registered in England and Wales (Register no. 07750446). Credit is subject to status and affordability. Terms and conditions apply. Authorised and regulated by the Financial Conduct Authority. Network Britannia Windows Limited FCA Register no. 738269 trading as Kayvex Windows is an appointed representative of Ffenestri Limited FCA Register no. 716352 Kimberley Road, Clevedon, Somerset, BS21 6QJ is a credit broker, not the lender. Credit is provided by Novuna Personal Finance, a trading style of Mitsubishi HC Capital UK PLC. Authorised and Regulated by the Financial Conduct Authority.