The party's spokesperson on Housing Eoin Ó Broin TD published the plan.
He said: "We would spend €2.8bn on public housing in 2021 an increase of €1.5bn on 2020 levels.
"Of these 20,000 public homes, 12,000 would be real social homes - 2,000 more that proposed by government.
"8,000 would be genuinely affordable homes for working people, evenly split between affordable cost rental homes and affordable purchase homes.
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"Affordable homes for €230,000 or less will be available to purchase in Dublin, the commuter belt and other major urban areas.
"Across the rest of the state, affordable homes for €220,000 or less would be delivered.
"Households' eligibility for affordable housing would be set at a gross income of €55,000 for a single person and €85,000 for a couple.
"For those wishing to rent an affordable home in the long-term or while saving to try and purchase a home, affordable cost rental homes will be available for between €700 and €900 per month depending on household size and income.
"Our plan is ambitious, costed, and urgently needed to help an entire generation of first-time buyers to gain access to homeownership.
"Our plan would also be available to second-time buyers who lost their homes through repossession, relationship breakdown or those trapped in negative equity properties who need to trade up due to family size."
