Amazing Living Spaces
Find Your Local Showroom
House Extensions
House Extensions
At Britannia Windows, we supply and install many house extensions for your property. House extensions are suitable for adding an extra living space or transforming an existing one. They offer luxury and warmth, so you can stay comfortable all year round. What sets us apart at Britannia is that we offer made to measure fits and outstanding customer care. Get in touch with us to see how an extension can help you!
Explore Our Range
Find inspiration in our extensive range of Architect Designed Living Spaces.
Pin Your Favourites
Use our gallery to select your favourite designs, then click the link to send them to us.
Get 3 Free designs
We’ll send you 3 Amazing Living Spaces superimposed onto the back of your home.
Luxury House Extensions
Get Your DesignsHouse extensions are luxurious additions to your property. It can be utilised as an office space or a laundry room, while the ridges give you plenty of natural light. This creates a room that is warm in the winter and cooler in the summer. An extension supports bifold doors and French doors, so you can get an equal blend of panoramic views and ventilation.
The house extensions are as versatile as the roofing and can be customised. Utilise a sold roof, tiled roof, or a glass roof, bringing more light into your property. And, you can choose form a range of colours, such as Slate Grey or Chartwell Green.
A house extension increases the market value as well, which is perfect if you want to sell it further. Potential buyers will be attracted to the illusion of a massive space, as they can use it however they please. Create a guest bedroom with an en suite, or use it as a living room. The possibilities are endless when you choose our extensions.
Customisation Options
Glass Roof
Frame Colour
White
Satin Black
Anthracite Grey
Golden Oak
Mahogany
Rosewood
Slate Grey
Agate Grey
Cream
Chartwell Green
Cornice Type
No Cornice
1 Tier
2 Tier
3 Tier
Curved
Ridge Type
Classic Ridge
Slimline Ridge
Glass Colour
Neutral
Aqua
Blue
Bronze
Orangery
Single pitch
Hip Lean to
Glass Roof
This stunning conservatory extension will fill your home with plenty of natural light.
Complete your conservatory design by choosing high performance glass. Our glazing will stop your room from overheating during summer; it will also prevent it from getting too cold when winter arrives.
We provide a range of choices so you can benefit from a fully configurable system that can cope with most building styles. Our roofs work with most conservatory shapes.
Tiled Roof
Your Tile Colour
Carbon Grey
Harvest Brown
Terra Brick
Cornice Type
No Cornice
Curved
CARBON GREY
TERRA BRICK
HARVEST BROWN
Tiled Roof
If you want to get the most out of your conservatory or orangery space, high-performance tiled conservatory roof replacements are an attractive prospect. By heightening the feeling of space, our sophisticated solid roofing systems can easily transform tired glazed extensions into a space that feels like a full house extension. They are the ideal finishing touch for both new & old glazed extensions, and you can look forward to improved thermal efficiency, better acoustic insulation & increased kerb appeal with a superb solid tiled roof.
Solid Roof
Cornice Type
No Cornice
1 Tier
2 Tier
3 Tier
Curved
Shaped Roof Lights
No Rooflighs
Solid Roof
Solid conservatory roofs are incredibly energy efficient allowing you to enjoy your living space all year round.
The Livinroof is designed to give you the flexibility to combine solid and glazed roofing seamlessly. It enhances thermal performance to deliver a room that you can use all year round. A stunning addition to any home, both new and old.
The internal features of the Livinroof design enables you to install a range of lighting and speaker options. This also helps to reduce heating costs and insulate your home.
Flat Roof
Skylight Type
Lantern
Skylight
None
Lantern Colour
White
Grey
Black
Fascia
Classic Fascia
Curved Cornice
Two Tier Flat Cornice
Four Tier Flat Cornice
Fascia Colour
White
Grey
Soffit Size
Standard
Extended
Large Lantern
Multiple Lanterns
Multiple Skylights
Flat Roof
If you like clean modern lines then a Flat Roof extension with skylights is the perfect choice for you. But if traditional grandeur is more your style, our beautiful pitched lanterns make a stunning alternative.
This high quality Flat Roof system is the most thermally efficient on the market with a U-Value of 0.12W/m2K and is available with either flat skylights, roof lanterns or no roof lights.
Black/Brown
Chartwell Green
Cream
Golden Oak
Irish Oak
Mahogany
Rosewood
Slate Grey
White
Anthracite Grey