Design Options for Your DIY Home Extension Kit

Say goodbye to ‘one-size-fits-all’ extensions. We give you full creative control over your extension’s design, and we’ll be right by your side with our expert advice and recommendations throughout the process.

Thanks to our huge range of customisation options, you can tailor your extension down to the smallest detail. From selecting the roof style to choosing the colours of your cladding, you have the freedom to personalise your extension as much or as little as you like.

Do you prefer a traditional pitched roof or a neat, minimalist flat roof? Bright or muted colours? Slate or shingle tiles? Whatever your vision, we’ll make it a reality.

Below, we’ve explored all the options you have when designing your extension. If you’d like to know more, feel free to get in touch with our team – we’ll be happy to answer your questions and arrange a visit to our showroom.

Roof Shapes

Thanks to our revolutionary pod system, our extensions can adapt to any pitched or flat roof style you can think of. Take a look our range of standard styles below:
A classic shape made up of three sides sloping towards the ridge.
Edwardian hipped
Similar to the Edwardian, but with four sides instead of two. Comes with an aluminium box gutter.
A simple, mono-pitched roof that offers clean lines. Perfect for adding large opening vents.
Lean-to side hipped
Same shape as a lean-to, with the addition of two hips creating two extra sloping sides.
A contemporary look with two sides sloping towards the ridge. You can choose to add a glass gable frame to the front to maximise natural light.
Flat roof
A flat, even roof with no slopes or pitch. Minimalist, modern, and timelessly stylish.
Vaulted Ceilings

Our structurally engineered steel corner braces are concealed within the framework, eliminating the need for structural trusses, tie bars, or tie wires on any pitched roof measuring up to 5 x 5 metres. Enjoy a clean, unobstructed ceiling and plenty of extra headroom!

Roof Colours and Materials


Slate Tiles

We use Britmet’s LiteSlate, a cutting-edge synthetic slate roofing tile made from 90% recycled polymers. This remarkable innovation embodies all the qualities you would expect from a traditional slate tile, without the cracking, breaking, or chipping that normal slate is prone to.

LiteSlate combines an authentic riven-edged finish with a range of classic colour options. Not only does it capture the timeless beauty of slate, but it’s also made from highly sustainable materials – the best of both worlds.

  • Lightweight at only 10 kg per sq metre
  • Fire rated to BS 476-3
  • 40-year warranty against weather penetration
  • Quick and easy installation

Shingle Tiles

We use Britmet’s Shingle tiles, which stand out with the widest standard colour range available in the UK. They’re almost indistinguishable from traditional American shingle, but with a unique twist: they feature a full dry-fix, interlocking hidden-fix design, allowing for a flush roof surface without visible fixings.
  • Lightweight at less than 7 kg per sq metre
  • Fire rated to AA classification
  • 40-year warranty against weather penetration
  • Interlocking hidden-fix design for quick and easy installation
Bramble Brown
Moss Green
Titanium Grey
Rustic Brown
Rustic Brown
Rustic Red
Rustic Red
Rustic Terracotta
Rustic Terracotta
Smoked Oak
Smoked Oak
Tartan Green
Tartan Green


Your double-ogee gutters can come in one of four colours: white, brown, grey, or black. Choose the one that matches your home’s existing gutters for a truly seamless look!
Anthracite Grey


Our fascias are available in two stunning finishes: plain white or woodgrain. Our woodgrain fascias come in a variety of colours and are designed to resemble real timber, offering an authentic look that’s almost indistinguishable from the real thing.
Woodgrain Black Ash
Woodgrain Light Oak
Woodgrain Irish Oak
Woodgrain Rosewood
Woodgrain Anthracite
Woodgrain Cream
Woodgrain Chartwell Green

Roof Customisation Options

Want to elevate your extension’s design? Upgrade it with our optional customisation options! Some of our many upgrades include:
  • External soffit
  • Internal pelmet
  • Roof windows
  • Gable overhangs
  • Built-in ceiling lights
  • Fixed full-height glass panels
  • Glass lanterns

External Cladding Options

Our choice for external cladding comes from Freefoam, known for their range of long-lasting and low-maintenance PVC-UE cladding solutions. All of their products are backed by a 10-year guarantee, giving you total peace of mind.

Want to use a real wood cladding or even a rendered finish? We can supply your extension without any cladding, so you can customise it as you wish.

Pale Gold
Misty Grey
Storm Grey
Colonial Blue
Argyle Brown
Slate Grey
Sage Green

Benefits of Freefoam Cladding

Easy to Install
All of Freefoam’s cladding products are easy to fit. Whether you opt for the standard PVC-U range or the aluminium range, their fitting trims are specifically designed for a hassle-free installation process.
Low Maintenance
PVC is well-known for its stability as a material. Cladding products made from PVC are exceptionally durable and long lasting, so there’s no need for frequent repainting or maintenance. Maintaining their appearance is as simple as giving them a quick wipe-down with a damp cloth.
Freefoam cladding is incredibly versatile, making it a perfect choice for all types of exteriors, including brick, masonry, and concrete. It effortlessly enhances the visual appeal of any project, whether the design is traditional or contemporary.
Energy Efficient
When paired with standard insulation materials, PVC cladding has received an impressive A+ rating from The Building Research Establishment’s (BRE) ‘Green Guide to Specification.’ This proves both its excellent thermal performance and its eco-friendliness.

Roof Window Options

Brighten up your space and let in more fresh air with roof windows!

We’ve partnered with Keylite to supply their award-winning roof windows as part of our kits. Their windows feature a variety of impressive features, including:

  • Integrated expanding thermal collar technology that keeps spaces cosy while preventing condensation and mould growth
  • Pre-fitted flick fit brackets for simple installation
  • Sash hinge finger springs that allow you to open and maintain the windows with ease

Keylite’s roof windows come with three modes of operation: manual, electric, and solar-powered. We’ve explored each type below!

Manual Operation

Manual windows can be easily opened and closed with the 2m pole included. Simply pull the top handle to let in fresh air, and push it to close the window! They also rotate a full 180°, making cleaning the glass from inside easy.

Electric Operation

Upgrading to electric operation lets you control your roof windows with just a touch of a button – perfect for roofs with higher pitches! The electric operation system also comes with a smart rain sensor that will automatically close the window if it starts raining, even when you’re not around.

Solar Powered Operation

Solar-powered windows are just like the electric ones, but they harness energy from the sun and store it in the roof window’s battery system instead of using mains electricity. This means you can enjoy your solar-powered window day and night, all while saving on your electric bills.


Enjoy a cooler, more private conservatory by upgrading to integrated blinds! These blinds are fully sealed within the glazing unit, so you won’t have to worry about cleaning them in a dusty environment. They also come with a slim aluminium side rail for smooth operation and a clean, classic look.

We have two fabric options for you to choose from: dim-out and blackout. Discover the difference between the two below!

Dim-Out Blinds

Dim-out blinds filter out around 75% of light, making them perfect if you’d prefer a cosy, intimate shaded room rather than total darkness.

Our dim-out blinds come with a variety of operation methods, including manual, electric, and solar options. Just keep in mind that if you’re interested in upgrading to electric operation, you’ll need an electrically operated roof window as well.

Blackout Blinds

Blackout blinds block out nearly 100% of light, allowing for an almost pitch-black room. They come with an enclosed cassette that not only protects the fabric, but also makes sure there’s no unwanted glow creeping in from the edges.

Our blackout blinds have been tested by BBA and are proven to reduce heat loss by at least 20%, making your room even more comfortable. Please note that they’re only available with manual operation.

Extension Base Options

When building your extension, you have two options: you can either retrofit it onto an existing base, or choose to build it on our innovative Durabase foundation.

Durabase combines a durable steel base with modular wall construction. This winning combination allows you to build it with ease, saving you both time and effort. We also have over 40 brick slip finishes for you to choose from, so you can easily find the perfect match to complement your home’s existing masonry.

Red Dragwire
Rustic Cream
Smooth Anthracite
Autumn Leaves

Talk to Our Extension Design Team

Don’t worry if you’re feeling overwhelmed by all the customisation options we have to offer. Our expert team are here to provide advice and recommendations throughout the process, so you’ll never be left wondering which option is the right one for you.

If you’re ready to kickstart the design of your dream extension, don’t hesitate to reach out to our friendly team. We’re here to support you every step of the way, so get a quote online or give us a call on 01202 399999 today!