Providing parking boosts sale value for Boston properties. In Boston, a single-car garage adds $420,000 to a home’s median sales price, according to a new study from Alan’s Factory Outlet that analyzed 42,000 single-family home sales using data from Redfin.

The median sales price for a Boston home jumped from $2,730,000 to $3,150,000 with a simple addition: a garage. Plus, median sales prices climbed when a second garage space was added. Homes with two-car garages fetched median sales prices of $6,750,000.

Notably, homes without garages sat on the market for 71 days compared to 62 days for those with garages. That means garage-less homes spend around 15% longer on the market.

Nationally, Boston ranked as the most expensive U.S. cities for homes with garages and was the only East Coast city in the top three. Irvine and San Jose, California took the No. 2 and No. 3 rankings.

“Properties with garages have sold for more money, attracted buyers faster and benefited from higher demand regardless of market location,” said study author Alan Bernau Jr. “Whether homeowners are considering building a new garage or renovating an existing one, the findings suggest that these upgrades may enhance the resale potential and overall property appeal.”