Hawaii’s bed-and-breakfast accommodations and vacation rental homes saw double-digit growth in 2017.

While roughly 54 percent of visitors to the islands stayed in hotels, 531,880 tourists stayed entirely in rental properties, a 12.3 percent increase from 2016, according to the 2017 Annual Visitor Research Report released Wednesday by the Hawaii Tourism Authority. Their average stay was 10 days.

The number of visitors staying exclusively at B&Bs rose 11.1 percent to 36,198, with an average stay of nine days. Oahu had both the largest percentage of rental home-only visitors, 44.3 percent, and B&B-only visitors, 54 percent, compared with the other islands.

With affordable housing one of Hawaii’s biggest challenges, the growing vacation rental market has become a heated issue as it has spread from largely resort areas into residential neighborhoods, reducing the number of rentals available for local residents.

“More visitors are choosing to stay exclusively at rental homes. With the proliferation of technology it’s easier for people to rent in what had been exclusively residential neighborhoods and that changes the dynamic of that community,” said Jennifer Chun, HTA’s director of tourism research.

Last year 4.9 million visitors stayed exclusively in hotels, up 3.8 percent from 2016, with an average length of stay of seven days, according to the Visitor Research Report. Those choosing to stay only in timeshare properties rose 4.3 percent to 648,319, for an average stay of nine days.

In addition, 1.2 million tourists stayed only in condominiums, an increase of 2.6 percent, with an average stay of 10 days.

Hawaii tourists were mostly satisfied with their trips, the report said. The highest ratings came from U.S. East visitors, with 91.6 percent giving the destination an “excellent” rating. The lowest satisfaction rating was from Koreans, with 74.9 percent giving high marks, which generally means they would return and recommend a Hawaii vacation to others.

U.S. West residents had the greatest willingness to return to Hawaii within the next five years. About 74.2 percent said they’d likely visit again, down from 79.3 percent in 2016, the report said. Just 57.8 percent of visitors from the U.S. East and 56 percent from Japan indicated they were likely to visit again. That compares with 65.2 percent of Canadians and 56.9 percent from Oceania.

“It’s not because they didn’t like their vacation, but those kind of factors like time and distance make a difference,” Chun said. “For the majority of our visitors they do think their visit to Hawaii was excellent. But the farther away, the less likely to return in the next five years.”

Total visitor expenditures in 2017 rose 5.6 percent to $16.8 billion last year from $15.9 billion in 2016, while overall arrivals increased 5.3 percent to 9.4 million from 8.9 million.