"We have seen an increasing demand from our intermediaries for larger loan sizes. "
The new maximum loan size will be available for both residential purchase and remortgage applications, with no change to pricing.
The Society said the increase was due to increased demand from intermediaries.
Emma Graham, Principality’s key account manager, said: “We have seen an increasing demand from our intermediaries for larger loan sizes. Therefore, our response was to change and help to expand our customer base whilst addressing a rise in property prices and a need for higher loan amounts.”