Any problem to build a house that covers a same-sized hole in the ground?
Look at it as a start on a foundation hole - but don't get hung up on &quot;making the house the same size/shape as the existing hole&quot; because you can alter the size/shape of the hole when building the foundation, on which you will put your house, of whatever size &amp; shape matches your ideas and budget.
You might feel more of an advantage to sticking with the hole size/shape if it was, say, quarried in solid rock and digging would be difficult/expensive, but since you mention the hole being dug, I assume lacking further info that it's in something approximating normal dirt, and normal dirt can be moved by the appropriate machines to build an appropriate foundation to set your house on.