Seattle has a higher percentage of new-construction apartments in its housing stock than any other big U.S. city. That can make it pricey for newcomers to move here.

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Just how big is Seattle’s apartment boom? Maybe even bigger than you thought.

As of 2016, there were nearly 21,000 occupied rental units in the city built since the start of the decade, according to new census data. That means recently constructed apartments make up 12 percent of the total rental stock, or one out of eight units. Among the 50 largest U.S. cities, that ranks Seattle as having the highest concentration of newer apartments.

Only Austin, Texas — the nation’s other fastest-growing city — is comparable to Seattle, and the two stand apart from the rest of the pack. In no other big city does newer construction make up even 10 percent of the total rental stock. In Long Beach, California, a mere 1 percent of units have been built since 2010.

Who lives in all these new Seattle apartments? Predominantly, millennials — many of the young people pouring into town wind up renting out these units. The census data show that 65 percent of apartment units constructed this decade have a resident under the age of 35.

In comparison, 52 percent of Portland’s newer units have a millennial resident. In San Francisco, it’s just 39 percent.

Joe Groom is one of those recent transplants to Seattle. Even though he never thought of himself as a granite-countertop and stainless-steel-appliance type of guy, that’s exactly what he got in his Capitol Hill studio. It’s in a brand-new complex of 57 micro-units, which replaced the two four-unit midcentury apartment buildings previously on the site

The 27-year-old relocated here this summer from Athens, Georgia, to do postdoctoral research at the University of Washington. He expected to find the type of apartment he’s lived in before: older, cheaper and a bit funky.

“I’ve lived in four different apartments before moving here,” Groom said. “They were all built in the ’60s or earlier.”

He tried to find the something older with a more budget-friendly per-square-foot price, but it proved difficult for someone moving here from across the country, and apartment hunting online.

“The older buildings, they’d require you to move in seven to 10 days,” he said. “You couldn’t get something a few months in advance.”

Also, there was more competition for the older, more affordable units. At a couple of apartments Groom had scheduled to see, his appointment was canceled because someone else had just signed the lease. And many of the older properties weren’t pet-friendly, and Groom was moving here with his dog, Dizzy. His phone calls about other older properties were never returned.

In the end, leasing in a new property was easier for Groom, and probably for many other young people who are facing the complicated logistics of a cross-country move.

The convenience comes at a cost, though. Groom is paying a budget-stretching $1,425 per month — and the only reason the unit is that “affordable” is because it’s so tiny, at just 345 square feet. Groom says he’d never paid that much before, or lived in such tight quarters.

The high cost of housing hasn’t yet hindered growth in Seattle and some other job magnets, but that may start to change, says Jonathan Spader, a senior research associate at Harvard University’s Joint Center for Housing Studies.

“One of the questions right now is, if I’m 24, do I move to Seattle or do I move to somewhere with a lower cost of housing — somewhere I may not make quite as much income in total but I still may have more left over after paying for housing?” he said. “That’s an open question.”

Spader says that economists are increasingly paying attention to the tendency for jobs and talented labor to “co-locate.” In other words, companies take into consideration where workers want to live when making decisions about where to locate.

“Amazon right now being a case in point,” Spader said, “whether to keep those jobs in Seattle or take them somewhere else.”

Despite the high cost of housing in Seattle, Groom says he’s thrilled to be here. And his new apartment suits his needs. The Capitol Hill location is great, and light rail to the UW is within walking distance.

“I have new everything, and there’s some amenities, like a game room,” he said. “A lot of more expensive places will have a rooftop deck, and in-unit washer-dryers, but I don’t have that.”

According to new data from real-estate analytics firm Real Page, Inc., the Seattle metro area had a 4.3 percent rent growth for new residents in the third quarter of 2017. That ties as the seventh-highest in the nation.