No. Help to Buy is designed to assist you to move on to or up the housing ladder. If you wish to sublet, you will first have to repay the Help to Buy: Equity Loan assistance. In exceptional circumstances sub-letting may be considered. For example, if you’re a serving member of the Armed Forces staff whose tour of duty requires you to serve away from the area in which you live for a fixed period. In these circumstances you would also require approval from your mortgage lender.