How much is the average home extension in the UK?

For those who have minimal space in their homes, a home extension is incredibly appealing.

Adding extra space onto your home could open up smaller rooms or make popular spaces far more intuitive, such as installing Bi-Folding Doors or adding an ensuite to a bedroom or a dining room to a kitchen.

If you are looking to expand your home and boost its kerb appeal, then here is the price threshold you will be looking at. 


Single Storey Extension

This is the most appealing option for many, as not only is it cheaper, but you may not even require planning permission.

This year, the average estimate for a single-storey extension was set at £1,350-£1,950 per square metre. It’s important to note, however, that this is an average price.

As anyone who has moved around the country will know, house prices are considerably higher in the south of England, and in particular, around London.

This means that in London and the South East, you can add an extra £500 to the above costs.


If you’re worried about adding the cost of extra dimensions to your two-storey dimension, don’t panic.

Luckily, there is a form that avoids the use of advanced mathematics to work out the estimated price.

Generally-speaking, you will need to add 50% of the total cost of your single-storey extension to work out the estimated price. 


The best way to figure out how much your extension is going to cost is to use the above guides to estimate the final cost.

As a rough guide, a small-sized extension is around 3 x 5 metres. This will see you spending over £16-17,000. Larger extensions, however, can reach the size of 8 x 8 metres, which will see you paying just shy of £50,000.

Just a few extra square-metres can add a considerable cost difference. 

Extra costs

Home Extension

The ball-park figure of the extension is not the end of the story. There are some other costs to factor in if you are looking to save up for a particular budget.

You may, for example, decide that you want an architect to create the plans for you. This can cost anything up to £1,000. This truly depends on the size and scale of your designs, however.

You may also have to factor in the cost of planning permission. This isn’t always necessary, particularly if it’s single-storey.

This cost is usually around the £200 mark, but that will depend on where you live. On top of this, you will also need to factor in the final cost of VAT. This will be added to the final cost of your project. 

The best way to understand how much your extension will cost is to get in contact with a contractor for a quote.

They will be able to factor in extra costs and estimate the total price for the work that will need to be carried out in accordance with the size of the extension you want.

This will take the stress away of trying to figure out what is the best option for you.