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."

Mr Rabbath says his customers are worried about access to the restaurant. (ABC Gold Coast: Bern Young)Mr Imlach, who operates several southern Gold Coast restaurants, said he had received an email from a John Holland consultant, but the information provided about the time line of the construction work was vague.

"We need to know how it's actually going to work," he said.

The restaurateur said he was seeking clarification on the time frame for the construction work.

"If they're doing it in the middle of the day, is that dust going to come into our restaurants … is it going to be too noisy for us to operate? We don't know any of that information yet," Mr Imlach said.

Scott Imlach says he too is waiting to hear more detail about the construction work.(ABC Gold Coast: Dominic Cansdale)Need more information to planMr Rabbath said customers were wondering how they would get to his business once the work began.

He said they needed time to plan.

"We know that they're not going to close our business down -- that's not realistic. But we just want some information," he said.

He said the information could be the difference between surviving and thriving.

Place managers 'minimise impacts'The Transport and Main Roads spokeswoman said the place managers were assisting John Holland to "minimise impacts and help businesses prepare for major construction".

She said engagement with businesses was a priority during construction, which would be "ramping up at times of heightened activity".