I'm after some advice from some experts out there.
We are looking to have a single storey rear extension completed on a semi-detached house - 5.8 metres across and 4 metres deep.
When choosing the floor construction, is there a simple way of working out the relative cost of concrete slab vs block & beam? Are there any websites that allow you to calculate a price per square metre for the two methods? Would there be any variance in the foundations used for each method?
Site access is via a path down the side of the house approx. 90 cms wide. Property is in South Central England.
As an aside, the soil is clay based and there is a large oak tree that will sit around 15 metres away from the extension.
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