So 75% LTV customers can take out loans up to £1m, while 80% LTV loan limits have been raised to £750,000.
The limits apply to 2-year mortgages currently with 5-year products bring included from next week.
There is no change to its 90% LTV loan sizes.
Richard Scott, national account manager for the West Brom for Intermediaries, said: “We regularly review our lending criteria as well as our mortgage rates and will always look for ways to make improvements, particularly if it’s something our customers and lending partners are calling for.
“Offering higher loan sizes will increase the opportunities for our intermediaries to access our products for new purchasers or to support existing borrowers who want to remortgage.”
The West Brom’s current mortgage range includes a 2-year fix at 1.99% to 65% LTV for new purchasers and homemovers with a £199 booking fee and £300 completion fee.