If your property sits on a slope, you could build a semi-basement with a part of the area sitting below the ground. Bringing light and air into half basements is usually straightforward, as you will be able to add windows and in some cases even bi-fold or sliding glass doors.
If you are adding a side or rear house extension to your house, you might be able to incorporate a basement extension into the design, so that you will have a two-storey extension which will only expand one storey above the ground level.
This would be beneficial for properties where building a regular double-storey extension is not an option due to design limitations or planning restrictions.
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