Extending your home is a fantastic way to add value to your property as well as create some additional space for your growing family or changes in your lifestyle. A question we, as architectural designers and engineers, get asked quite often is how much the extension of an existing property will cost.
The answer is, unfortunately, not straightforward. There are several variables that come into play when it comes to home extensions. Size, location, specifications and build route will all affect how much your extension will cost you.
Although we cannot give you an exact price in this blog post, we can provide you with some estimates so that you can plan accordingly.
Ground floor rear extensions
A ground floor rear extension of 30 square meters will cost around £45,000 to £98,000 if you are inside London and around £37,000 to £80,000 outside of London.
Rear extensions are quite popular as they build onto the back of your property into your garden space.
Ground floor side return extensions
A ground floor side return extension of 30 square meters will cost around £52,000 to £98,000 inside London and around £43,000 to £80,000 outside of London.
A ground floor side return extension essentially fills in dead alleyway space at the side of your property. This is a great alternative to a rear extension as it does not use any of your garden space.
Ground floor wrapround extensions
A ground floor wraparound extension of 45 square meters will cost around £78,000 to £146,000 inside London and around £65,000 to £120,000 outside of London.
This is a great option if you need a significantly larger space added onto your home. A wraparound extension combines a side return and a rear extension in an L-shape.
Two-storey extension
A two-story extension of 45 square meters will cost £78,000 to £146,000 inside London and around £65,000 to £120,000 outside of London.
An extension of this nature is an alternative way to introduce a large new space to your home. The bigger size of this project affects the cost, but the value that is added to your property makes it worthwhile.
Hidden costs
Firstly, the above estimates do not account for VAT and they also do not include kitchen finishes, glazing, landscaping and bathrooms. These finishes will depend on the quality of products you choose and the look you want to achieve. You can dedicate around 5% of your budget to finishes.
You may also encounter issues with your existing property that can cause the price of your extension to increase. The estimates above assume that the existing property, its soil, drainage, and foundations are in good condition. If they are not, this would cost you more.
If you would like expert advice as to how much an extension would cost you in the UK, contact us.