XL House XL House was completed at the end of 2001 and is still the biggest private project completed in Bermuda for over thirty years. It is the head office building for a major international company and is designed to international Class A standards. Entasis led a team of international consultants to deliver this US $115 million project on time and budget. As the prime consultant for this award winning head office complex we have demonstrated our ability to compete in the international realm.