Under the updated policy, applicants earning more than £40,000 and up to £60,000 could access borrowing of up to five times their income, subject to affordability and lending criteria.
Borrowers earning more than £60,000 may be able to borrow up to 5.75 times income.
The mutual said the changes are aimed at customers who can afford higher borrowing but may be constrained by current lending thresholds.
West Brom said the updated approach could increase borrowing potential by up to 15% for some customers, while maintaining responsible lending standards.
John Philips, product manager at West Brom Building Society, said: “Affordability remains one of the biggest challenges to buying a home. As a mutual, we’re focused on supporting homeownership by tackling real affordability challenges. By increasing borrowing potential by up to 15% for some customers, we hope to make a real difference.”
