Southern Gold Coast business owners say they have no information about how the project will affect their restaurants but the Queensland government says support is on offer.

They say it is unclear whether or not dust, jackhammers or large barriers will destroy trade during construction.

Restaurateurs Patrick Rabbath and Scott Imlach want to know how they will be affected by works set to begin on the long-awaited third stage of the light rail from Broadbeach to Burleigh Heads.

Dust, jackhammering or barricades?But a Transport and Main Roads spokeswoman said GoldlinQ's light rail contractor, John Holland, had "dedicated place managers" to provide on-ground support throughout the construction phases.

"The place managers have been engaging with businesses to gain a detailed understanding of how each operates," she said.

But Mr Rabbath, who owns Rabbath on the Gold Coast Highway, said he had not yet been contacted by anyone.

"I must be living in a different world … to be honest, because no place manager or a dedicated point of contact has contacted me to actually come and tell me exactly what's going on," he said.

"I have absolutely no idea."