It has also revised rates on its 85% LTV products and extended end dates on products within its Help to Buy range.
Notable new products include a 90% LTV 5-year fix at 3.64% and an 85% LTV 5-year fix at 2.79%.
Both products include £500 cashback, whilst the former is for house purchase only and the latter is for remortgages and includes a £999 fee.
An 85% LTV 5-year fix at 3.14% has also been added.
This product is for house purchase only and offers £1,000 cashback.
End dates for Help to Buy purchase and remortgage products have been extended until June 2023 and June 2026 respectively.
Richard Scott, head of intermediaries at The West Brom, said: “Like many lenders, we have been monitoring the market closely to ensure that we re-enter the 90% LTV market at the appropriate time, whilst maintaining our high service standards.
“The new range is our first step back into the fixed rate 90% LTV market and adds to the choice available to homebuyers whilst offering one of the lowest rates currently available in the market.”
