Murdock Builders Merchants, which employs 200 people said its ninth branch would offer a free landscape design service in partnership with Acheson and Glover.
Ann Morgan, chief executive of Murdock, said the 30-year-old company had responded to the construction downturn by trying to appeal more to the general public.
"We have always prided ourselves on knowing our local customers and tailoring our service to meet their needs," she said.
Ciaran Sweeney, manager of the new Lisburn branch on Ballinderry Road, said the trend to 'improve' rather than 'move' had resulted in more people seeking advice on improving their homes.
"We have been able to respond positively to changes within the property market - and this has been an important factor in our continued growth," he said.