The boost is a 15% interest-free equity loan from Gen H, supported by the house builder you’re buying from.

With New Build Boost, the 15% boost closes the gap between your 5% deposit and your standard 80% Gen H mortgage.

For the first 5 years, the boost is frozen, which means if you pay it back within those first 5 years, you’ll only repay the original amount you borrowed. So if you borrow £15,000 and repay the boost in year 3 of your mortgage, you'd only have to pay back £15,000 to clear your boost.

After the 5-year mark, the value of your boost will step up or down with the value of your home – including any change to the value of the property in those 5 years.

So after 5 years, if the value of your home has gone up, you'll repay more than you originally borrowed. If the value of your home has gone down, you could repay less than you originally borrowed.

We cap the repayment value of the boost, which means you’ll only ever have to pay back a maximum of 2x the cash value of original boost loan.

So if you borrowed £15,000, and the value of your home tripled over the course of your ownership, you'd only pay back £30,000, not £45,000.

You'll still have to make all your regular mortgage payments regardless of when you pay back your boost.