It is the highest recorded annual figure since the Government's Affordable Housing Investment Programme (AHIP) began a decade ago.
In addition, 411 new council houses were completed across the country in 2009, compared to 195 in 2008.
39 per cent fewer private sector new homes were built in the year to September 2009 than in the same period in 2008.
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Housing and Communities Minister Alex Neil said: "These new figures vindicate the Scottish Government's decision to accelerate our investment in affordable housing.
"It has clearly speeded up the supply of affordable housing for families throughout Scotland whilst supporting jobs, the construction industry and the country's' economy."
He continued: "It is, however, disappointing that the level of private new build starts has continued to fall sharply in comparison with previous years.
"Ensuring an adequate supply of affordable housing presents a major challenge requiring innovative approaches, driven by reform, new thinking and a fresh approach to how housing is funded.
"We will continue working constructively with stakeholders and others to accelerate recovery and meet the challenges of the future."
(GK/BMcC)
