The Rainbow Club Centre for Autism currently supports more than 625 families in the Cork area but has more than 230 on waiting lists for its services.
It is seeking to buy a two-storey complex in Little Island in the hope of being able to cater for the thousands more seeking support.
The new 3.2 acre site in Little Island could see the service expand to cater for 1,000 families in the first year, and 2,000 within 18 months.
“The building will cost €2 million and we’re appealing for government departments to help us buy it,” said Karen O’Mahony, who founded the Rainbow Club with her husband John in 2015.
“Around 625 families can access us, but only once a week, due to a lack of space and we want to expand that to ensure everyone is supported.
“We can help but we need the facilities to be able to,” she added.
The Rainbow Club began with 22 children and a budget of around €600 in 2015.
“Since 2015, we’ve supported hundreds of families with ASD programmes,” said Ms O’Mahony.