1. Istana Nurul Iman Palace – Brunei – 2.15 million square feet
Could the biggest house of the world not to be a huge huge palace? At the first place of our top 10, we find Istana Nurul Iman Palace. Based in Brunei, it was nicknamed the Palace of Fight Light and it was constructed by the Filipino firm. With a value of $1.4 billion, it boasts 1,788 rooms and 257 bathrooms, horse stables, swimming pools and even a mosque that can host 1,500 people. So, a very incredible place!