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What is an ADU?

Legally called an “accessory dwelling unit,” or ADU, the home is a third the size of a typical new home in the city. ADUs – often called “second suites” -- are generally a few hundred square feet and built as an addition to a home or a separate standalone structure. Homeowners can cordon off a section of their existing homes to create ADUs, too, with city approval.

adu exterior red siding
Photo Credit: Alyssa Lee Photography

Chris Iverson, the home’s owner, understood his role as a groundbreaker for ADUs in his neighborhood and went with a sleek design, so out-of-the-ordinary dog walkers, bikers, and drives often stop and have a look.

“The architecture gets a lot of interest from people,” said Iverson, who works out of his home in the information technology field. “I’ve had people stop by and take photos and say, ‘we love your house.’”

adu exterior night
Photo Credit: Alyssa Lee Photography

On a home tour earlier, this year the 650-square-foot ADU attracted more than 1,200 visitors who discovered what living small looks like in the Longfellow neighborhood of the city. Many expressed an interest in building one on their property and asked him plenty of questions, he said.

The idea of having a separate residence within a home or on city property is hardly new. They went by many other names in the “old” days, among them laneway houses, granny flats, in-law units, and secondary units. Today planners dub them ADUs, and they have become prevalent in Portland, Los Angeles, Seattle, Austin, and other growing cities.

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adu kitchen faucet sink
Photo Credit: Alyssa Lee Photography

St. Paul, on the other hand, first permitted ADUs in just one neighborhood and saw just one built. After a long debate among neighborhoods, the city council in October 2018 expanded ADUs to the entire city.

Iverson knows something about zoning problems. After the city rejected his initial plan, he spent more than $3,000 on paperwork to get the ADU approved. No neighbors have ever complained, he said, and now, any of them could build their own ADUs without the expensive paperwork.

Key to making the ADU a reality is the required ownership of the main property. Iverson owns and rents the 1922 duplex on the street in front of the ADU. Part of the issue with the city, he said, was zoning issues involving the duplex, the only one on his block.

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adu longfellow open living room kitchen
Photo Credit: Alyssa Lee Photography

The lifecycle of a home with a second suite is outlined in an intriguing way. An ADU begins as more space for a growing family. Years later it is rented or used by a son or daughter attending college, followed by a young adult needing a space to live.

Grandparents eventually move in and when the initial owner's age, they migrate to the second suite, and the main house becomes occupied by one or more of their family members.

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Article By

Frank Jossi

Based in St. Paul, Frank Jossi is a journalist, editor and content strategist. He covers clean energy in Minnesota for Midwest Energy News and writes frequently for Finance & Commerce. His work has appeared in more than 70 local, national and international publications.

Frank Jossi