Sure, we will do exactly that. However, we have (like probably most builders) an overall budget that should ideally not be exceeded. Ours is 900,000. And when it comes to construction prices... It makes a big difference whether around 40k or 80k will be spent on a basement. Since the costs for many other expensive things are also hard to estimate in advance, it's really difficult to figure out roughly what the total sum will be in the end. That's why I'm so interested in the experiences of other basement builders.