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House Extensions in Exeter & Devon

house extensions costs

House Extensions in Exeter & Devon

Are you looking for solutions that improve your property value & kerb appeal? Then, consider our house extensions available for those in Exeter, Devon, or the surrounding area. With an increased amount of space and light, they are more than just a long term investment! 

House Extension Designs

View Your Dream House Extension

Featuring orangeries and conservatories, house extensions are a popular choice in and across Exeter, Devon. You can expand your house’s existing scale to create a cosy and ambient space, whether you are planning to use it for parties, dining or relaxing. With a wide range of house extension roof options, you can also design your new space to your specific needs such as to soak it in with natural light. 

Customisation Options




Chartwell Green




Golden Oak


Irish Oak






Slate Grey




Anthracite Grey

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.

Energy Efficient

With super-insulated columns, our house extensions achieve an impressive levels of energy efficiency consisting of A+ rating and U-values of 0.15 W/m²K. Featuring an additional steelwork for structural integrity of your house extensions, they give you excellent insulation and strength.

Approved Ultra Installer

AGS Windows is your trusted and local installer approved by Ultraframe. We regularly go through assessments and tests, to ensure a high standard of installation service as your Ultra installer. So you have rest assured in the industry above standards we provide.

Insulated Pelmet

Filled with mineral wool for extra insulation, our house extensions feature insulated pelmet to blend in with the rest of your home. Consider central lighting panels, speakers or different types of lighting to make them feel like the other rooms in your home.

Finance Options

We understand it is a big decision to choose a new house extension. But we want to make things easier for you. That's why, at AGS Windows, you have a wide range of finance options to help you spread the cost over a time that is convenient to you.

Valuable Investment

Though there are various factors that are taken into account when calculating the cost of house extensions, such as size, style, glazing, or the type of roof, they offer a very valuable and cost-effective solution.

Not only they are highly energy efficient that makes an immediate difference by lowering the cost of your energy bills, they also increase your property value by adding extra space. What’s more, they feature super-insulated columns that are full-height and attached to the foundations of your house extension. So they are not only energy efficient, cost effective but also, completely robust for excellent durability & security. 

orangeries interior

Customisable Units

We offer numerous customisation options for your house extension. As an Ultra installer, we can provide a range of roof systems, spacious upgrades, spotlights, pelmets, speakers and many more, you can design a truly bespoke house extension for extra warmth, cosy ambience and natural light. There’s really something for everyone and every porperty here at AGS Windows. 

Despite being highly thermally efficient as a standard, there are also various glazing options. You can also increase the performance of your house extension, and create a space you can enjoy 24/7.

orangeries exterior

Frequently Asked Questions

What is a house extension?

House extension are the perfect building solution for those who does not want to move or add another floor to increase space in their homes. It simply means to extend the property by increasing its overall floor size while remaining at the ground level which then helps to design a bespoke room that fits your unique needs. 

Do I need a planning permission to install house extensions?

In most cases, you will not need planning permission to install house extensions as long as they are aligned with the standards of a permitted development. But it is dependent on the location and the size of the house extension you need. For example, if you live in a conservation area, you will need to apply to local building authorities regardless of the size or the placement of your house extension.

Get in touch with us to find out more about permitted development rules. Our expert team will need to assist you further on this after learning the details about the size or the placement of your house extension.

How much are house extensions?

It is difficult to provide a price for your house extension as there are various customisation options.  It really depends on the dimensions to shape or even your location in Exeter or Devon. The best way to find out the cost of house extensions is to dial us at 01392 547272, a member of our team will be more than happy to guide you through it all. 

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Network Britannia Windows Limited t/a AGS 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 AGS 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.