Is it permissible to take out a usurious loan from a bank to build a house when one is unable to save money?

What you have inquired about falls under the category of prohibited usury (riba al-qard), which is when one person lends money to another on condition that the borrower returns more than what was given. This is among the gravest of prohibitions, as Allah Almighty says: (O you who have believed, fear Allah and give up what remains [due to you] of riba, if you should be believers. And if you do not, then be informed of a war [against you] from Allah and His Messenger). We advise you to stay away from this transaction.