Fifty new jobs have been created with a £750,000 investment at the Sprucefield branch of McDonald's.
The outlet outside Lisburn will boast Northern Ireland's first dual 'drive thru' restaurant, with the expansion bringing employment levels to 140 full-time and part-time staff.
As well as refurbishing the restaurant inside and out, the new look 'drive thru' will enable two cars to order at the same time, improving efficiency and speed of service.
The new development will help serve 150 cars every hour.
There will be seating for 160 diners inside, an extended outside seating area and free WiFi for customers.
Franchisee John McCollum has held the lease on the branch for almost 19 years and has just signed a further 20-year contract.
"As a local franchisee I'm keen to ensure steady investment in the area and I am pleased to be able to provide 50 new full- and part-time positions," he said.
"Investing in the development of our staff is also important - it will help us to continue to deliver consistently high levels of customer service and we want to ensure our crew has a good learning ladder of opportunities ahead of them to benefit their career."
McDonald's operates 26 stores in Northern Ireland and currently employs over 1,975 staff.
By the end of 2012 95% of the company's restaurants will have a brand-new look with the rest of the estate completed in early 2013.
The firm is creating an extra 2,500 new jobs in 2012 across the UK, and plans to invest around £30m in the training of restaurant staff this year.