A planned 216-apartment complex at Gilberton in Adelaide's inner north-east will be scaled back.

The Opposition has been swift to blame the South Australian Government, citing high taxes and charges and red tape.

Opposition Leader Steven Marshall said the construction industry was suffering and the Government was doing little to help.

"The Government has got mixed messages to the construction sector, on the one hand they say 'We want to get people living in the city, we're going to offer a stamp duty concession' but on the other hand they're massively hiking the costs for the sector, increasing the red tape and, as I said, the work health and safety bill is an absolute disaster for the construction sector in South Australia," he said.

The director of the Gilberton project, Mick O'Connor, said the SA Government's extension of a stamp duty concession had been less effective than hoped in attracting buyers.

But he said the Government was not to blame for the housing project being downsized.

"I think the State Government's been very proactive actually in the sense of trying to get developments going around Adelaide," he said.

"Look, I've been in the building industry for 25 years, sat on the national board of the Master Builders and it's been a very difficult time (recently)."

The developer said an updated plan for its 45 Park project would be released within a few months.

Mr O'Connor took Mr Marshall to task when he found his development had suddenly become the subject of political attention.

"I think it would have been really good politically and from a business point of view to ring me and get my view on it, don't you think?" he asked Mr Marshall.

The Opposition did make a phone call, but failed to mention it was planning a news conference at the site.

Premier Jay Weatherill was critical of Mr Marshall's efforts.

"In his rush to score a political point, he has jeopardised this project," the Premier said.

Mr Marshall countered: "It's not a matter of talking the project down. It's a simple statement of the current economic situation that we're in."

Earlier in the week, the SA Government announced it was fast-tracking a range of construction projects to help the building sector.