Experian found more borrowers are looking to remortgage onto fixed rate deals.
MoneySuperMarket found people were unsure of what the term remortgaging means.
In addition to the Help to Buy reductions, the lender is offering reduced rates for house purchasing and remortgaging.
But while transaction levels hit their highest point since September 2009 on a 12-month rolling average, they remain some way off their pre-crash highs.
First-time buyer completions were up some 12.5% on Q2 2017 figures representing the highest quarterly level since 2005.
However the number of homemovers and first-time buyers was down during the period by 2.6% and 2.4% respectively.
The proportion of remortgages has risen by nearly 10% over the last 12 months, as home owners are increasingly switching mortgage companies to find more attractive rates.
Conveyancing panel management specialists LMS said the number of remortgages decreased in the last month, dropping by 12% from 34,900 in August to 30,766 in September.
Santander has introduced two exclusive products with the tool, a 60% loan-to-value 2-year fix at 1.23% and a 60% LTV 5-year fix at 1.99%, both with a £995 product fee.
The surge in remortgaging meant the total amount of housing equity withdrawn via this route in July rose by more than a quarter (27%) from £951.8m to £1.2bn.