Regnier (pictured) held the post of deputy chair since May 2018 and succeeds Cambridge Building Society chief executive Stephen Mitcham.
Family Building Society chief executive Mark Bogard has been elected deputy chairman, filling the vacancy left by Regnier.
Regnier said he was very pleased to be taking on the role of BSA chairman during this exciting yet challenging time.
“As building societies do the vast majority of their business in the UK, they’re insulated from many of the consequences of Brexit, but not from economic uncertainty or adverse consumer confidence,” he said.
“Clarity and resolution are much needed for businesses and consumers alike.”
Regnier also highlighted that housing and helping people to fund their own home was a key challenge for the country and building societies at present.
“We know that 86 per cent of the general public want to own a home of their own but buying a home has become increasingly challenging for first-time buyers, those who need a larger home for a growing family and older people alike,” he continued.
“This is an active area of innovation among building societies already, with more to do.”