House-building can be the most profitable type of residential building project, based on the sums of money involved. Get it wrong and your hard-earned profits will get whittled away. Why does it happen? Admin. Success is made on your laptop – not on site. It’s all in the data – from the quote to the very final payment. By syncing HBXL’s software tools you have an accurate thread running all the way through it, and maximum profit at the end.