Data

Zoning

Missing middle housing allowed in zoning (by-right, special exception, conditional use)

For residential land within Landscapes3 urban and suburban centers, not all county land.

Missing middle housing Type Total land permitted Percent of all residential land Total undeveloped land Percent of undeveloped land Total developed land Percent of developed land
Land (in acres) where missing middle housing type is permitted Percent of all residentially zoned land in suburban and urban growth areas allowing missing middle housing type Undeveloped land (in acres) where missing middle housing type is permitted Percent of undeveloped residentially zoned land in suburban and urban growth areas allowing missing middle housing type Developed land (in acres) where missing middle housing type is permitted Percent of developed residentially zoned land in suburban and urban growth areas allowing missing middle housing type
Rehab 8,224 42% 531 36% 7,693 42%
Accessory dwelling unit 6,503 33% 461 32% 6,043 33%
Twin 9,654 49% 540 37% 9,115 50%
Townhome 8,548 44% 483 33% 8,065 44%
Duplex 8,850 45% 460 32% 8,390 46%
Triplex 7,982 41% 437 30% 7,545 41%
Quadplex 7,855 40% 403 28% 7,452 41%
Multiplex 7,808 40% 430 30% 7,378 41%
Live-work 1,882 10% 50 3% 1,832 10%

Missing middle housing allowed by-right

For residential land within Landscapes3 urban and suburban centers, not all county land.

Missing middle housing Type Total land permitted Percent of all residential land Total undeveloped land Percent of undeveloped land Total developed land Percent of developed land
Land (in acres) where missing middle housing type is permitted Percent of all residentially zoned land in suburban and urban growth areas allowing missing middle housing type Undeveloped land (in acres) where missing middle housing type is permitted Percent of undeveloped residentially zoned land in suburban and urban growth areas allowing missing middle housing type Developed land (in acres) where missing middle housing type is permitted Percent of developed residentially zoned land in suburban and urban growth areas allowing missing middle housing type
Rehab 2,599 13% 142 10% 2,457 13%
Accessory dwelling unit 4,231 22% 218 15% 4,013 22%
Twin 8,691 44% 468 32% 8,224 45%
Townhome 4,952 25% 307 21% 4,646 26%
Duplex 7,414 38% 353 24% 7,061 39%
Triplex 4,373 22% 233 16% 4,139 23%
Quadplex 4,052 21% 215 15% 3,837 21%
Multiplex 4,105 21% 233 16% 3,872 21%
Live-work 819 4% 33 2% 786 4%

Land Capacity

Missing middle housing Type Missing middle housing type land unit capacity of undeveloped land (all residentially zoned) Single family detached land unit capacity of undeveloped land (all residentially zoned) Difference
Approximate missing middle housing units that could be accommodated by undeveloped area (not including ROW) in residentially zoned land in suburban and urban growth areas Approximate single-family detached units that could be accommodated by undeveloped area (not including ROW) in residentially zoned land in suburban and urban growth areas Approximate additional units resulting from missing middle housing development
Twin 15,770 2,210 13,560
Townhome 22,442 2,210 20,231
Duplex 14,961 2,210 12,751
Triplex 28,052 2,210 25,842
Quadplex 32,416 2,210 30,205
Multiplex 39,362 2,210 37,152
Live-Work 26,522 2,210 24,312
Missing middle housing Type Missing middle housing type land unit capacity of undeveloped land (all residentially zoned) Missing middle housing type land unit capacity of undeveloped land (by-right, special exception, conditional use) Missing middle housing type land unit capacity of undeveloped land (by-right)
Approximate missing middle housing units that could be accommodated by undeveloped area (not including ROW) in residentially zoned land in suburban and urban growth areas Approximate missing middle housing units that could be accommodated by undeveloped area (not including ROW) in residentially zoned land in suburban and urban growth areas allowing missing middle housing type Approximate missing middle housing units that could be accommodated by undeveloped area (not including ROW) in residentially zoned land in suburban and urban growth areas allowing missing middle housing type
Twin 15,770 5,834 5,056
Townhome 22,442 7,435 4,718
Duplex 14,961 4,721 3,622
Triplex 28,052 8,409 4,487
Quadplex 32,416 8,959 4,776
Multiplex 39,362 11,598 6,278
Live-Work 26,522 900 601

3 https://www.census.gov/data/tables/time-series/dec/coh-units.html