Construction industry leaders, relevant ACT ministers and government officials are set to meet on Tuesday to discuss how and when sites can reopen safely.

Thousands of workers have been stood down and it remains unclear when they will be free to start work again.

Mr Barr said the government would review public health directions before or by day 14 of the lockdown, which is Thursday.

Work was allowed to restart on the build of a new facility for the Therapeutic Goods Administration on Monday.

Construction on the Fairbairn site was deemed as essential works by the federal government as it will be used to support Australia's COVID-19 response.

As it was deemed essential by the federal government, it did not require an exemption from ACT Health.

Master Builders ACT chief executive Michael Hopkins questioned why some sites were allowed to open and others weren't.

"If some sites can open up safely, why can't all building sites open up safely," Mr Hopkins said.

"That's the question that our members have been asking us, and rightly so.

"We know our industry can operate safely. We've been working very productively with government on what those safety measures would be.

"We're calling on the government to work with us to reopen the industry as soon as possible, or as soon as it's safe to do so."

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Mr Hopkins said he understood a small number of projects had been deemed essential and these were mostly ACT and federal government projects.

Mr Barr said the government would look to sites that had been allowed to reopen as a guide for the broader resumption of construction.

But the Chief Minister expressed concerns about compliance, saying it was not always 100 per cent in the industry.

"Across the construction industry, like society more broadly, there are people who are excellent, who have absolute and utter commitment to workplace health and safety," Mr Barr said.

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