During development of the HB 2001 and its rules, state legislators talked about the typical pace of neighborhood change. The state expects increases in middle housing to be gradual. HB 2001 does not force property owners to make changes. Some property owners may choose to remodel or redevelop to add more living units, but big changes like that are more common when property is sold.
A fraction of Beaverton property sells in any given year. And of that property, only some will be cost effective to develop as middle housing. Even then, only some buyers will have the ability, means or desire to provide middle housing. In other words, the middle housing supply is likely to increase slowly.
We are researching the economic feasibility of middle housing development in different parts of the county. This will help us understand where middle housing might develop and how our potential policy and code changes could affect feasibility.