Cost of Building an Extension

What is the Cost of Building an Extension?

The cost of building an extension for your home is going to cost anywhere between £14,535 and £72,000. However, keep in mind this is simply a guide price that is going to be dependent on a few different factors. This can include the installer you choose, as well as where in the country your property is. We know this can be surprising to hear!

Other factors that are going to alter the cost of building an extension include the size of the extension, the roof option you go for, how long the extension will take to install, and any accessories that you may opt for. Keep all of these elements in mind when it comes to determining the final cost of building an extension.

Knowing this, what can you do to ensure you keep the cost of your building extension down?

A fantastic place to start is to compare the cost of building an extension across a range of installers. We know it’s easy for you to get carried away at the prospect of investing in a new addition to your home, especially when they offer you all the benefits of a modern home extension. However, simply taking your time and having a look around can help to save you money in the long run.


Cost of Building an Extension

What is the Cost of Building an Extension if it’s Small?

The cost of building an extension is going to be dependent on size, as we previously mentioned. However, as a frame of reference A typical small extension costs around £14,535: with dimensions of 3000mm wide and 3000mm projection. However, this is still dependent on a range of factors that will alter the final price.

What’s more:

Any design or styling changes, like the colour, size, or accessories, will add to the end extension cost. Which is something you’ll need to keep in mind.

Do you want a tiled, glass, or lantern orangery design?

Do you want additional thermal efficiency features?

What glass would you be looking to go for?

Be prepared to pay extra for those!

Just like other home improvements, the size of the orangery also plays a huge role in determining orangery prices.


house extensions prices

Cost of Building an Extension: Guide Prices

What is the Average Cost of Building an Extension?

As mentioned earlier in this article, there isn’t a clear-cut answer when it comes to average cost of building an extension. Simply put, there are just too many contributing factors that are going to change the final price that you get.

However, with this in mind you can view our price tables below. Here, you’ll be able to gain a good gauge on how much you will need to be paying for your extension. Have a browse and see what you think when it comes to the cost of building an extension.

Instant Cost of Building an Extension

At Conservatory Online Prices, we offer you the opportunity to get your extension price online. You can use our extension cost calculator to get an instant extension quote. You can also use the extension price tables used throughout this article for reference.

Extension Width (mm) Extension Projection (mm) Guide Price
5000 3000 £24225 – £26775
5100 3000 £24709 – £27310
5200 3000 £25194 – £27846
5300 3000 £25678 – £28381
5400 3000 £26163 – £28917
5500 3000 £26647 – £29452
5600 3000 £27132 – £29988
5700 3000 £27616 – £30523
5800 3000 £28101 – £31059
5900 3000 £28585 – £31594
6000 3000 £29070 – £32130
6100 3000 £29554 – £32665
6200 3000 £30039 – £33201
6300 3000 £30523 – £33736
6400 3000 £31008 – £34272
6500 3000 £31492 – £34807
6600 3000 £31977 – £35343
6700 3000 £32461 – £35878
6800 3000 £32946 – £36414
6900 3000 £33430 – £36949
7000 3000 £33915 – £37485

The Cost of Building an Extension: Comparing Local Installers and National Installers

When it comes to the cost of building an extension, comparing local installers and national installers will aid in you getting a better price overall. Not only this, but it also means that you’ll be able to enjoy the priceless peace of mind that comes with knowing you have made a decision that has been based on research.


House Extension Cost


The Cost of Building and Extension and Energy Ratings

The cost of building an extension can also be determined by energy rating of the building too, this is because the components needed to create a building with a higher thermal efficiency is going to cost you more in the long run. This includes everything from the windows and doors, through to thermally efficient glazing and extra insulation.

The thermal efficiency performance of your extension is going to be measured on an easy to understand WER (Windows Energy Rating) scale. This spectrum works on a colour coded system that spans from ‘A rated’ through to ‘G Rated’. If your extension sits on the ‘A’ part of the scale, then you can rest assured that you’ll be keeping those winter winds at bay with ease.

The Cost of Building and Extension: Glass and Colours

How well it retains the heat isn’t the only thing that is going to have an effect on the cost of building an extension. The aesthetic features that you opt for are also going to determine the final price too. For example, the glazing and colour choice that you opt for will play in a role in how much you are looking to pay as well!

This is because there is a wide range of glazing and colour options available for you to choose from. You’ll be able to choose such options as toughened safety glass, thermal efficiency glass, self-cleaning glass, or a tinted option that is going to have an aesthetic look. The fantastic thing about an extension is how much versatility you’ll be able enjoy. However, all at a cost!

The cost of building an extension can also be changed by the colour you opt for. Whether you’re looking for something that stands out or you’re looking for something that is going to have a more understated look, you’ll be able to find it. However, keep in mind that your choice of colour could change your cost as some colours have special requirements.

You can see an example cost of building an extension by using our house extension cost calculator or by viewing the price tables on this page. Use our house extensions cost calculator to compare prices. If you are interested in colours other than white you can select these when creating your quote.

Alongside this, the windows and doors that you choose are also going to have an effect on the final cost of building a house extension. This is because a lot of windows and doors can be fitted with a range of hardware options. The higher specification locks and profiles you opt for, the higher cost of building an extension you should come to expect.

Cost of Building an Extension: What’s the Best Option?

The best house extension is going to be dependent on a wide range of factors. There are three distinct types of extension that you can opt for. These are tiled, solid, and glass. Each on of these options is going to have its own benefits and charm, including differing prices at the end of the specification process.

A tiled extension, for example, is a great option for homeowners looking to bring a traditional feel to their home without missing out on modern innovations. Alongside this, a solid roof is the ultimate modern choice. A glass house extension enables you to bring a bright and spacious feel to your home without letting the elements in, ensuring the best of both worlds.

Does Size Change the Cost of Building an Extension?

In short, size is going to have an effect on the cost of building an extension. The bigger the extension the more you should be expecting to pay. This is because it will require materials and a longer installation time. Using our guide prices or visiting our cost calculator is a great way to see how the size is going to change the final cost of building an extension.

Cost of Building an Extension Calculator

Our cost of building an extension calculator enables you get a free, instant, and competitive guide price from the comfort of your home. All you have to do is use this free tool and follow the simple step by step process to get a quote.

Further to this, you’ll also be emailed a link to your quote so you can refer to it at a later date. Don’t worry, the quote isn’t set in stone. If you need to amend or add to your needs, you can do so. Feel free to take your time to get the best price for you.

Please keep in mind that the prices you receive from our house extension cost calculator are accurate to a high degree. However, this doesn’t mean that they are not subject to change. Always be prepared for the cost of building an extension to change!


Cost of Building an Extension


What Is Included in Your Cost of Building an Extension?

Hidden costs are something that you’ll have to consider when you’re looking for the cost of building an extension. This is because sometimes installers aren’t always completely transparent with their prices, which means that you could find yourself stung by something unexpected!

However, you can rest assured that our cost of building an extension calculator has been designed to be as honest and as transparent as possible! You won’t have to worry about any hidden costs through this method and you can use this guide price as the foundation for approaching your installer of choice.

The online quote you generate using our cost of building an extension calculator will include:

A full technical survey

The style, size and colour of the product

Energy efficiency rating (whether A, B or C WER.)

Security features

Glass (a choice of standard, toughened or obscured.)

Handles

The full installation which includes all colour matched trims, fixings, silicones and sealants.

Registration with an industry body such as FENSA or Certass and relevant certification.

Cost of Building an Extension: What are The Benefits?

Getting a house extension installed into your home will bring an array of benefits for you to enjoy. Further to this, determining the cost of building an extension will enable to see what sort of quality you should be expecting.

Alongside this, the cos of building an extension is an investment at the end of the day. The more you pay, the more value and lasting quality you can come to expect. You may even be surprised to hear that a high-quality house extension could save you money in the long run! This is because a thermally efficient extension could help cut down your annual heating costs.

The cost of building an extension is also going to be an indication of how secure your extension is. We know that a part of feeling at home is the safety and security that you feel. With this in mind, you won’t want to cut down on how much you’re paying on security features. To help you with this, many modern extensions comprise windows and doors that have high-security locking systems.

How Do You Keep the Cost of Building an Extension Down?

Looking for the right cost of building an extension can be a daunting process, especially when there are so many options for you to choose from. A great place to start when it comes to keeping your cost of building an extension on the lower end is to compare prices from three different installers. To help, we’ll put in touch with your best three once you’ve got a guide price!

Another way for you to keep the cost of building an extension down, as we’ve mentioned, is to get in touch with your installer of choice to see if they can offer you a deal or discount based on your house extension specification! Keep in mind the time of the year too, as you could find that a seasonal offer will play in your favour.

When it comes to the cost of building an extension, don’t simply accept the first price that you’re given. This is important to keep in mind as some sales team will be looking to get you on your first cost. Don’t be afraid to haggle or negotiate when it comes to getting a price that suits both your specification and your budget.


Cost of Building an Extension


Who is the Cheapest Extension Installer?

The cheapest installer, much like the cost of building an extension, is going to be reliant on a few different factors. This includes how big they are how much of a range they have. Alongside this, the deals and discounts they can offer you are going to be dependent on a few factors too!

However, don’t settle for the cheapest if they are the worst! When it comes to the cost of building an extension, you should always be considering quality. To help you make your decision, you can check the reviews of the installer in question to see the sort of experiences other homeowners have had with their home improvements.

You can also discuss a best price with your installer, as they may be willing to be flexible when it comes to your final cost of building an extension. You never know what they are going to say! The market may be quiet, or they may be testing a new deal that isn’t publicly displayed! The only way to know for sure is to ask.

Frequently Asked Questions

What is the cost of building an extension?

Generally speaking, the cost of building an extension lies between £14,535 and £72,000. This, however, is heavily dependent on size, installer, additional features, and if any discounts are applied! The best thing to do is head to our online house extensions cost calculator to get a guide price to approach your chosen installer with.

What’s the difference between a conservatory and an extension?

An extension is generally viewed as a more substantial structure, with a higher degree of thermal efficiency and the possibility of removing the internal doors. A conservatory and an extension will also require differing building regulation standards too!

How many types of house extensions are there?

At a glance, there are a wide variety of house extensions to choose from. This includes everything from single storey through to larger designs. You can also opt for a different roof, including tiled, solid, and glass. Visit our extensions cost calculator for more information.

Instant Online House Extensions Costs

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