You can build it, but they won’t park there.

Over the decade since I moved to Portland, I have lived in seven different places. Three of those homes had off-street garages, but I always parked my car on the curb.

Why? One house used the garage as an extra living room. Another driveway had a sharp turn into the garage, making it a hassle to back out of. The last garage had a steep incline to get to it, so bikes and other bulky items were stored in it instead.

This isn’t uncommon. A survey of detached homeowners in Sacramento, California, published in February, showed that when there isn’t space enough for both storing a car and household items, the cars are the items that end up moving elsewhere. The survey found that 37 percent of homeowners didn’t store a single car in their garage.

And why would they? The government constructs, maintains and distributes free car storage space along the curb in front of almost every house.

Yet our governments continue to mandate off-street parking with every new home, thinking that somehow the presence of a garage is enough to make someone park in it.

The Sacramento finding adds to a growing body of work documenting how infrequently people use garages for cars:

Field observations of 97 garages in the Mission District of San Fransisco, California, found that 49 percent of them were not used for car parking.

A New York Metropolitain Transportation Council survey found only 13 percent of households with a garage parked there.

A survey of homeowners with a one-car garage in a suburb near Redding, England, found 38 percent of garages were not used for vehicles.

In Melbourne, Australia, a survey found that 18 percent of residents in single-family detached homes used garages for non-car purposes.

One of the most thorough studies was performed by a team of researchers from UCLA’s Center on Everyday Lives of Families, who photographed the homes of three dozen families over nine years. They found that 3 of 4 households had too much stuff in their garage to park a car.

It’s not surprising that when push comes to shove, cars are the items that end up outside. Unlike an old sofa, cars are weatherproof. Curbside spots are also legal to store automobiles, while putting an extra fridge or storage shed in the same spot can get you fined. There is also likely an ample number of spaces available. Surveys of on-street parking spaces in the residential neighborhoods of Davis, California; Eugene, Oregon; and Bellevue, Washington, found that even at peak hours the curb spaces were mostly vacant, with 71 to 89 percent of parking spaces going unused.

Almost everywhere in the Pacific Northwest, as in the rest of the United States and Canada, it’s illegal to build a home without also building one or more parking spaces to go with it. A common defense of these costly parking mandates is that if there is an off-street space to tuck in every car for the night, curbside parking will never get too full. But this idealized image ignores reality. When storing a car on the curb is free, a garage isn’t necessarily a garage: it’s a great big walk-in closet.

TO CLEAR UP A CROWDED CURB, YOU HAVE TO PRICE IT

Even when curbside parking is a hassle, it can still be difficult to coax a car owner into a garage, no matter how mandatory the garage is. Perhaps no example illustrates this better than the West End neighborhood of Vancouver, British Columbia.

A study in 2017 found that 15 out of 16 car owners who live in the West End have access to an off-street parking space. But even at the busiest times of day, those garages and driveways were half empty, just 47 percent utilized. Meanwhile, 88 percent of on-street spots were full.

Why wouldn’t residents want to use their private garages instead of circling for five minutes for a street spot? Because parking garages that needed to recoup their construction cost were being undercut by the city. At the time, residential parking permits from the city were $6 a month, while most buildings ...