Owner Michael Brennan said he was blown away with the award.

"We were pleased to be named a state finalist, but to win has been amazing," Mr Brennan said.

Although this is not the first time the Dubbo store has walked away the winner, making this their third win in the past 15 years.

Mr Brennan said he and his staff were not shaken when the unprompted judges arrived at their store to observe how they operated with each other and customers.

During the next 12 months, Mr Brennan said he and the Mitre 10 staff would be focusing on maintaining the high standards of store management and customer service.

"That's something my father always aimed to do," Mr Brennan said.

"It's very important for us to do the best that we can."

2015 is shaping up to be a big year for the Brennans Mitre 10 team, with not only an award under their belts, but also a total store revamp on the cards.

"The revamp will take off in the next 12 months," Mr Brennan said.

"We're very excited with the plans and can't wait to get started."