Whether it’s a single-storey or a double-storey house, your house extension cost may vary depending on different factors. In this blog post, we’ll discuss a house extension cost per m2in the UK. If you are planning to extend a house, it’s only feasible if you are aware of the cost of extension. Without an idea of the cost of house extension, it’s impossible to make any decisions in the context of how it looks or whether you can afford one at all. However, with house extensions an increasingly popular choice for those looking for home improvements, we’ll break down what you need to create a budget and how much you might need to pay for standard finishes. And, while each project will have different costs, being equipped with the right information about what it might cost to build an extension, you will find yourself in a much better position.
What is a home extension?
A home extension is where you add space to your existing property. During a house extension, homeowners can enlarge current rooms or create new rooms. Home extensions can be done using different ways. Some projects extend home upwards, add another storey, extend outward into the garden, or sideways, extending into unused side return space.
What is the house extension cost per m2?
It’s quite difficult to put an exact amount on the extension cost per m2 as there are various variables to consider: from your location to the size of the extension and the level of specification you are looking for. Your extension prices can also be affected by how your new space will be used. For instance, a kitchen extension could cost you far more than a playroom or an office extension.
The average cost of a house extension per m2 in the UK may range from £1700 per sqm to 4,000/m2, depending on the size and location of your extension. The average extension cost in the UK may depend on:
- The size of the extension
- Type of extension (e.g., kitchen extension or side-return extension)
- Quality of finish (e.g., low or high-quality materials)
As a general guide, a house extension price per m2 falls within the following ranges:
- Basic finish: Extension costs per m2 in the UK usually range between £1700 and £2,000 per m2.
- High-end finish: The better the finish, the higher the cost, with the average extension cost per square metre falling between £2,000 and £3,000 per m2.
Looking for a house extension builder?
You need to start your house extension plans in advance. Compare a home extension cost to get an idea of the overall cost of building an extension that you expect to budget for. You can get quotes from GTB Builders. By submitting a few basic details, you can receive a quote from us for house extensions in North London.
Builders that specialise in home extensions are in high demand and might be booked up several months in advance. However, by getting in touch with GTB Builders in advance, you can get in there early and be ready to start work on time. Starting 3 to 4 months in advance also gives you enough time to have a plan and designs ready for submitting to your local council for planning permission and building regulations approval.
Compare extension cost per m2
As each project can be different, using an overall average cost is a great starting point. By calculating the costs of house extensions based on per m2, you can create an estimate depending on the space in which you plan to build. It is also an easy way of being able to scale up or down depending on how much you are able to afford to spend on your project.
Additionally, calculations of the cost to extend house per m2 are useful to have a clear picture of the budget that you need to prepare. This can also help you know the cost of other areas of the build, which might include anything from upgrading flooring materials to establishing how much painting will be required.
Here’s the comparison table of cost per square metre extension for a single-storey extension and a double-storey extension. While a double-storey extension may appear less costly, the cost of the overall project could be higher due to increased scale and complexity of the extension.
| Type of extension | Cost per m2 |
| single story extension cost per m2 | £1,700 – £1,900 |
| Double-storey extension | £1,500 – £1,800 |
Compare the home extension cost by finish quality
The finish quality may have a big impact on the house extension cost per m2:
| Finish quality | Cost per m² for Single Storey | Cost per m² for Double Storey |
| Basic | £1,000 – £1,700 | £950 – £1,500 |
| Good | £1,700 – £1,900 | £1,500 – £1,850 |
| High | £1,900 – £2,200 | £1,850 – £2,200 |
Conclusion
The cost per square meter of a house extension may vary depending on various factors. Remember that this is just an estimated cost; for the exact figure, you can get in touch with GTB Builders.