Labor has targeted aspiring home owners and those who rely on public housing in a $150 million pledge ahead of Saturday's South Australian election.
Premier Jay Weatherill says the government will replace 600 old and outdated public housing properties, creating 500 jobs.
The promise comes on top of the 1000 homes already under construction as part of a previous budget commitment.
Mr Weatherill says the construction program will create work across the building trade.
"Electricians, bricklayers, plumbers, everybody that gets involved in a house, we want to make sure they have a continuous pipeline of work," he said.
"There are ups and downs in the private market, but the public investment can continue that pipeline of work."
By building two homes on many of the public housing blocks, the program will free up about 400 allotments that can be sold off to the private housing market.
The premier has also unveiled a shared equity scheme to make it easier for low and mid-income earners to enter the property market, providing up to 1000 would-be home buyers with a "massively important leg-up" to getting into the housing market.
The scheme will allow home buyers to access up to 25 per cent of the value of a property as an interest-free deposit.
Labor's commitments continued its big-spending approach to the 2018 election campaign with the full impact of its promises and how they will be funded to be revealed on Thursday.
As SA enjoyed the Adelaide Cup holiday on Monday, Liberal leader Steven Marshall focused on shop trading hours and said he would move quickly on deregulation if elected in a major boost for retailers, workers and consumers.
"We will bring South Australia's archaic shop trading hours into the 21st century," he said.
"South Australian businesses and consumers want choice, and deregulation of shop trading hours will create more jobs and opportunities for workers in the state's retail sector."
Under present arrangements, many suburban shops are not allowed to open on public holidays and have their hours limited on Saturdays and Sundays.
Both Mr Weatherill and SA-BEST leader Nick Xenophon criticised the Liberal plan, saying it would benefit big companies at the expense of small retailers and actually cost jobs.
Mr Xenophon turned his attention on Monday to Adelaide's disused Port Stanvac oil refinery, calling for the site to be properly remediated and redeveloped with housing, parks and commercial precincts.
He said the plan would create much-needed jobs in the south.
"The vast 230-hectare refinery site has been a virtual wasteland since being closed by Exxon Mobil 15 years ago," Mr Xenophon said.