Housing charity Threshold claims there would be double the number of homeless people in Ireland but for its interventions.
This week, the Department of Housing revealed that 10,514 people are living in emergency accommodation, the highest figure ever recorded.
In publishing its annual report for 2018, Threshold revealed that a further 11,500 people were kept in their homes by the charity's interventions.
The charity has urged the government to provide more active interventions and prevention. Failing to do so will lead to "yet more human misery" as evicted families look to emergency services for shelter and support.
Threshold's annual report showed it answered an average of 321 calls per day from tenants needing support.
Aideen Hayden, Threshold chairperson, said that "proper planning for the future" can resolve the crisis.
"Prevention services really work; supports in the community can keep vulnerable people in their homes, and a long-term social housing building programme is required. Lack of long-term planning got us here," she said.
Writing in the report, Ms Hayden said that soaring rents have left many families trapped in the private rental sector.
"Many families excluded from home-ownership are paying more in rent than they would in mortgage repayments," she said.
"We are facing a housing system where Irish people will be renting indefinitely. Many people ask, what’s wrong with renting for the rest of your life. People in Germany and Austria do it all the time.
"The rental market in Ireland, though improving, is still insecure, unaffordable and of poor quality. Tenancies can still be ended for no reason. Moreover, rents grew 6.9% nationally in 2018."