Updated May 22, 2016 5:42 p.m. ET

Student loans are often blamed for the record-low homeownership rate among young adults. But new research suggests that young people without a college diploma face especially big hurdles to owning a home.

College graduates ages 18 to 34 years old without student debt will need just over five years of additional savings to afford a 20% down payment for a starter home, defined as the median home at the bottom third of the market, according to research to be released Monday by Apartment List, a rental listing website. In comparison, it takes college grads with student loans about 10 years. For those who haven’t graduated from college, the wait to buy a home swells to nearly 15.5 years.

“It’s really everywhere that people without college degrees won’t be able to afford homes. They could be stuck renting for a long time,” said Andrew Woo, director of data science at Apartment List.

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