Customers with a Help to Buy Shared Equity mortgage with another lender will be able to remortgage to NatWest on a like-for-like basis, keeping the same balance and term.
The lender said the move may allow customers with another lender to save money by remortgaging to NatWest.
To switch, customers need to notify the Home and Communities Agency (HCA) and, if applicable, the developer lender for consent to change mortgage lender.
NatWest is also overhauling its residential mortgage range by cutting fixed-rate deals by up to 43 basis points, withdrawing and introducing products.
NatWest head of sales Mark Bullard (pictured) said: “Today’s launch demonstrates our commitment to continuous improvement.
“At the same time we’ve taken the opportunity to make some significant rate reduction across our core and semi exclusive range”
The Help to Buy shared ownership remortgage range has two-year and five-year fixed options available at up to 75% loan to value, with either no fee or a £995 fee.