Featherston should experience "minimal" disruption in trading during the six months it will take to build the new Featherston supermarket and cafe, says Trust House chief executive Allan Pollard.
The $2.5 million project begins with breaking of the ground on Monday morning.
Mr Pollard said the bottle store, cafe and post shop will be the last things to go, to minimise disruption for their staff and customers.
He said a lot of work is able to be done off-site, and the new building can be built over existing buildings for a time.
"It's quite clever - the supermarket will still be there, and we can knock through one of the walls. We've tried as much as we can to limit any kind of close-down of the supermarket," said Mr Pollard. "We don't envisage staff losing any hours."