The Complete Guide to Single Storey Extensions

Feeling cramped in your current living space? Need more room for your growing family? A single storey house extension might be the perfect solution.

Of course, there are plenty of things to think about before you make the leap. You might be wondering what type of extension would work best with your home’s style, whether you can match it to your existing property, and (most importantly!) how big a dent it’ll make in your bank account.

Not to worry. You can find out all you need to know about single storey extensions, from available styles to expected costs, by reading through our full guide below!

The benefits of a single storey extension

Adding a single storey extension to your home isn’t just a great way to expand your living space. It lets you improve your home’s functionality and aesthetics, all while adding thousands to its final sale price.

More living space

A single storey extension can add extra space to your home, making it more comfortable and functional without the cost and hassle of moving into a new house. You could turn your new room into a:

  • Bedroom to accommodate a growing family or guests
  • Relaxing space for entertainment or socialising
  • Fully equipped home gym
  • Private office, ideal for working from home
  • Larger kitchen or dining area, so you have more room to cook, eat, and entertain guests
  • Playroom or nursery

The possibilities are endless, and the only limit is your imagination!

Increased property value

Thanks to the extra living space and functionality it provides, a single storey extension is a big draw for potential buyers. This drives up the overall value of your property, letting you recoup most of the cost of the extension when you choose to sell.

A single storey extension can also make your home stand out from other properties on the market, particularly if it has been designed to complement the existing architecture of the house. This can make your property more attractive to potential buyers and may even result in a faster sale.

Enhanced natural light

A single storey extension can be designed to let more natural light spill into your home, creating a bright and airy space that’s more pleasant to live in. Natural light has numerous benefits, such as boosting mood, improving sleep quality, and promoting productivity, making it an essential element of a healthy home environment.

Fully customisable

One of the greatest benefits of a single storey extension is the flexibility it provides in terms of design and customisation. It can be tailored to meet your specific needs and preferences, allowing you to create a unique living space that reflects your personal style.

For example, if you need more space for a home office, a single storey extension can be designed as a dedicated workspace with ample natural light and space for storage. Alternatively, if you love to cook and entertain, a single storey extension can be designed to include a spacious, modern kitchen with all the latest appliances and features.

You can also use different materials and finishes to create a specific aesthetic, including countless tile, fascia, soffit, and brick options.

Types of single storey extensions

There’s no shortage of design options available for single storey extensions, making them a highly versatile choice for homeowners looking to expand their living space. Whether you have a specific vision in mind or are open to exploring different design options, there are enough possibilities to suit all budgets and property types.

Rear extension

A rear extension is what most people think of when they imagine a house extension. Fitting neatly onto the back of your property, it lets you expand your current ground-level rooms or create a whole new one with ease.

Even better? According to permitted development rights, you can add twice as much space with a rear extension as you can with other single-storey extensions. It can reach up to 8 metres, providing you with plenty of additional space for your home.

Side extension

As the name suggests, a single storey side extension is built onto the side of your existing property. Usually smaller than other extension types, it’s ideal if you have limited space in your back garden but room on the left or right of your property.

Wrap-around extension

A wraparound extension is a great choice if you want to maximise your living space without sacrificing your outdoor area. By utilising both the rear and side of your property, you can create an uninterrupted living space that doesn’t encroach into your garden too much.


A conservatory is a timeless way to let more natural light into your home. Often used as a sunroom or a garden room, it can be built onto the side or rear of your property.

While a conservatory may not add the same value as an extension, it can be a more cost-effective way of adding extra space to your home.

Roof styles for single storey extensions

There are two main roof types for single storey extensions: flat and pitched. Flat is exactly what it says on the tin, while pitched comes in a variety of shapes:



A simple but effective shape made up of three sides sloping towards the ridge.

Double Edwardian Gutter Roof Icon

Double Edwardian with box gutter

Double-sided Edwardian with aluminium box gutter.

Lean-to Roof Icon


A simple, mono-pitched roof that offers clean lines. Perfect for adding large opening vents.

Hipped Lean-to Roof Icon

Hipped lean-to

Same shape as a lean-to, with the addition of two hips creating two extra sloping sides.

Gable Roof Icon


A contemporary look with the option of a glass gable frame to front to maximise natural light.

How much does a single storey extension cost?

The cost of a single storey extension can vary greatly depending on the size of the extension, the materials used, the location, and the complexity of the design. On average, you can expect to pay between £1,200 and £2,000 per square metre for a basic single storey extension, with more complex designs and higher-end finishes costing considerably more.

As a rough guide, a simple single storey rear extension of around 15 square metres might cost between £18,000 and £30,000, while a more complex wraparound extension of around 40 square metres could cost upwards of £60,000.

While the costs of traditional construction methods for single storey extensions can be high, there’s a more cost-effective alternative you can choose: a DIY extension kit.

A DIY kit provides all the necessary materials and instructions for building your own single storey extension, without the need for hiring professional builders. These kits typically include prefabricated components that can be easily assembled on-site, such as wall panels, roof trusses, and windows.

A DIY extension kit will save you thousands on labour costs, as you’ll be doing the construction work yourself. You’ll also have more control over the project, as you’ll be able to work at your own pace and make any necessary adjustments as you go.

Save time and money with a DIY extension from Trade Price

With over 20 years of experience in the industry, Trade Price are one of the UK’s leading suppliers of custom DIY extension kits. We pride ourselves on tailoring every detail of your kit to meet your exact requirements, offering a warm, personal service all the way through.

We believe in putting you in the driver’s seat of your design. We offer a range of customisation options, including doors, tiles, fascias, soffits, and brick base borders, allowing you to match the colours of your house and garden. Our cladding options also complement the colours in your garden, giving you complete control over the look and feel of your extension.

As the manufacturer of all our products, we’re able to offer you the very best price on the market. You’ll be dealing directly with us, cutting out any middleman fees and keeping costs down. We can even deliver your kit to your door within just three weeks of ordering!

Each kit comes with a comprehensive step-by-step installation guide, giving you all the information you need to install your extension yourself. With our easy-to-follow instructions, you can be confident that you’ll be able to complete your project to a professional standard, without the need to hire expensive contractors.

Whether you’re a seasoned DIY enthusiast or a first-time builder, our kits are the perfect low-cost way to add an extension to your house. With Trade Price, you can be confident that you’re getting the best possible value for your money, without compromising on quality.

  • Finance options available
  • 3-week turnaround
  • 10-year guarantee
  • Building reg approved

Ready to get started? Get a quote online or call us on 01202 399999!


Our DIY tiled roof conservatories and extensions kits will be delivered to your door in as little as 3 weeks, along with a step-by-step installation guide to make building them quick and easy.

Secure your DIY tiled roof conservatory with just a £50 deposit.


We are proud to be authorised by the FCA so can offer our customers advice on their finance options including buy now, pay later. Give us a call to find out more!


Your Warmer Roof has been independently tested and certified by Stroma, an accredited national building control approvals agency.