House extensions are a perfect way to add living space without the hassle of moving. Our extensions are designed to complement your home’s character while providing that much-needed extra space. Whether it’s a sunroom, a larger kitchen, or a new living area, we ensure high-quality materials and craftsmanship. Enjoy an enhanced quality of living with our professionally designed house extensions.
Our house extensions are as flexible as our roofing options and can be tailored to meet your specific needs. Opt for a solid roof, a tiled roof, or a glass roof to brighten your home with natural light. You can also pick from a range of colours, such as Slate Grey or Chartwell Green.
Extensions don’t just expand your living space—they also boost your property’s market value, making them a smart investment if you plan to sell. Potential buyers are drawn to the sense of spaciousness and the freedom to use the area however they wish. Whether you’re creating a guest bedroom with an en suite or adding a new living room, our extensions offer limitless possibilities.
Why Choose Us for Your House Extensions?
Built to Last
Durability is key in any building project, and our house extensions are no exception. At Britannia Windows, we use only the highest quality materials that are proven to withstand the test of time. Whether it’s the robust framing, premium-grade glazing, or weather-resistant external finishes, each component is selected for its longevity and durability. This ensures that your house extension will remain safe, secure, and beautiful for many years, giving you peace of mind and a great return on investment.
Stylish Options Available
No matter your aesthetic preference, Britannia Windows offers a variety of styles to choose from for your house extension in Bristol. From modern minimalist designs that feature large glass panels and sleek lines to more traditional extensions that complement the historical aspects of your property, our bespoke designs are tailored to meet your specific tastes and requirements. This flexibility allows you to enhance your home’s character while adding valuable living space that feels both functional and stylish.
Thermal Efficiency
At Britannia Windows, our house extensions in Bristol are designed with superior thermal efficiency in mind. Each extension is constructed using advanced materials and techniques that ensure optimal insulation. This not only keeps your home warm during the colder months but also helps to reduce your energy consumption, leading to lower utility bills. Our commitment to sustainable building practices means that you can enjoy a comfortable living space that’s both energy-efficient and environmentally friendly.
Peace of Mind with Our Guarantee
Enjoy the added comfort of a 10-year guarantee on all our house extension projects. This guarantee reflects our confidence in our workmanship and the quality of the materials we use. Invest in your home with Britannia Windows, knowing that your new house extension is built to last and covered for years to come.
House Extension Prices, Bristol
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
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
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
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
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
Home Inspiration
Get 3 FREE designs in 2 simple steps.
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.

Online
Request a quote, use our digital designer or schedule a free one-to-one session with a design expert
Get a free online quote
In Store
Email us to learn more or to book an appointment to visit the showroom.
Get in Touch
At Home
Have our friendly design expert over to discuss your project, advise and take measurements for an on-the-spot quote.
Book a home visitGrow Your Home and Save Money With A House Extension
Building your house extension will save you plenty of money on energy bills. Our extensions are some of the strongest and warmest builds on the market, giving you low U Values. They come with large glazing patterns that let unnatural light. With energy prices rising significantly, these orangeries will make your home warmer without using central heating.
One of the main reasons why extensions are installed is because they add an extra living space to your home. The versatile options include building an extra kitchen or even an office space if you work from home.
The Perfect Temperature All Year Round
House extensions offer the perfect temperature all year round. They can support both double and triple glazing, saving you money on your energy bills. This keeps you warmer in winter and cooler in summer. And, what’s more, you can choose from solid, tiled, or glass roofs too, giving you a wealth of options.
If you are ready to design your house extension, why not get a free quote? It is free and easy to use, and we will get back to you straight away.
Frequently Asked Questions
How much is a house extension
Your house extension price will vary depending on what you use it for.
For a more exact answer, check out our online quoting engine. Enter your bespoke details and we will generate a bespoke price.
How popular are house extensions?
House extensions are very popular in the UK due to their versatility and space. They can be used for a variety of rooms, such as an office space if you want to work form home, or an extra kitchen to connect your house to your garden.
The extensions add more light to your home, saving plenty of money on energy bills. The glazing deals with robust knocks, which are useful to keep intruders out.
What doors can I use in my house extension?
The choice is entirely yours! House extensions support a vast range of doors such as French Doors and bifold doors. Both these doors create the illusion of a bigger space, and come in a selection of bespoke colours.
What’s more, enhance your security features with our multi point locking systems and advanced shootbolt techniques. These designs ward off intruders, keeping you and your family safe.
Why choose a house extension?
A house extension can be used in a variety of spaces in your home. For example use it for a office space, living room or kitchen.
If you want to spend more time with your family, the extension will help create a versatile area. Use it for a guest room wth en suite. The possibilities are infinite!
Happy Customers
Meg Welch
Great job of our new front door. They couldn’t have been more helpful and even fitted earlier than originally planned. Also gave great aftercare advice and at a very reasonable price! Would 100% recommend.
Annette Clemons
Cannot recommend Britannia Windows enough! Joe & Keith, the installers were great – explained what was to be done, showed me everything I needed to know upon completion, very considerate & tidied up really nicely. Very friendly guys who are an asset to the team!!
I LOVE my new windows & door. Such an improvement.
Rachel Godfrey
We have been extremely pleased with Britannia’s service. From the initial quote through to installation they were great and really easy to communicate with. We had our conservatory roof replaced and they were by far the least pushy and most competitive in terms of pricing.
We can definitely recommend their services and will likely be returning again soon for a new front door!
Peter Burgess
Fantastic job from initial phone call through to final tidy-up.
Britannia provided great advice before purchasing my new windows and fitted them to a high standard being punctual and polite throughout.
No request was a problem and I will definitely be using them again and would recommend to friends and family.
Jerry G
Wow a fantastic job by both sales team and fitting team.
Sam provided excellent service and answered any questions that we had. Luke, Dave, Keith and Joe did a fab job at fitting the windows and doors. Never having had anything like this done before I was a little nervous but the guys were clean and tidy and the outcome is amazing.
Would highly recommend.
