For a Help to Buy mortgage in Nottingham, you will need to have a minimum of a 5% deposit. This 5% is taken from the sale price of your new build property. The government will top up your deposit through an equity loan to make up a total of a 25% deposit. For example, if you put down a 5% deposit, the equity loan will be 20%; if you had a 10% deposit, the equity loan will be 15%.