The city can make three critical fixes to its 20-year growth plan: Let middle housing be bigger, allow apartment buildings in more places, and legalize car-free homes everywhere.

Seattle is in the process of updating its Comprehensive Plan, its 20-year roadmap for growth. Chief among the policies it charts is, of course, housing. Seattle's chronic shortage of homes and the harm that has done to lower-income residents and communities is no secret to anyone.

Unfortunately, the draft plan falls far short of what's necessary to create a Seattle that welcomes households of all incomes. In short, it doesn't make enough room for more homes.

If adopted as proposed, more and more people will continue to be priced out of the city for decades to come. And the city will also fall further behind on goals to reduce climate pollution and sprawl.

The critical fix is straightforward: loosen zoning rules to allow more homes of all shapes and sizes. And Seattle can improve its draft Comprehensive Plan to make that happen in three key ways. (I cover them briefly in the numbered sections below, then expand on each in the rest of the article.)

1. LET MIDDLE HOUSING WITH MORE HOMES BE BIGGER

Allowing middle housing - small-scale homes like fourplexes - in places once reserved for detached houses is an imperative for creating more homes that more people can afford in lower-density neighborhoods.

The good news is that the 2023's Washington state bill HB 1110 requires Seattle to legalize middle housing in areas currently reserved for single-detached houses. Three-quarters of Seattle's residential land will be opened up to more housing, creating the potential for tens of thousands of new homes.

The bad news is that just allowing more homes per lot doesn't by itself guarantee anything will get built. That's because middle housing construction is usually not financially feasible unless zoning rules allow the buildings to add indoor space as their unit count goes up. Seattle's proposed Comprehensive Plan (Comp Plan, for short) doesn't do that, and instead would impose the same cap on buildable capacity as what currently applies to single-detached houses with accessory dwellings. This limitation would not only suppress the construction of middle housing but would also prevent any feasible projects from having family-sized homes.

The solution is to emulate Spokane's best-in-the-US middle housing zoning, which grants generous development capacity and flexibility. Or, at minimum, implement the middle housing capacity recommendations of Washington's Department of Commerce, which stipulate workable increases in capacity.

2. ALLOW LARGER APARTMENT BUILDINGS IN MORE OF THE CITY

Apartment buildings five stories and up, near job centers, transit hubs, mixed-used nodes, schools, and parks, are essential for providing the level of density that both reduces cost and adds homes at the scale needed to address Seattle's shortage. Large multifamily buildings in compact, walkable, low-carbon neighborhoods also yield the biggest dividends on reducing climate pollution and sprawl.

Seattle's draft Comp Plan proposes only a modest amount of upzoning for apartment buildings. It recommends four- to six-story buildings in 24 newly designated "neighborhood centers" confined to just an 800-foot radius, and eight stories in a new urban center at the 130th Street light rail station. Otherwise, it proposes no apartment upzones anywhere else, excepting some slivers of land currently zoned for low density in designated centers, and possibly some 1/2-block strips along arterials.

Seattle's plan could rise to the moment by allowing highrise towers in all regional centers and near all light rail stations, eight-story buildings in all urban centers, and six-story buildings near frequent transit stops and other community amenities like parks. It could also designate more and larger neighborhood centers with apartment zoning.

That may sound like a lot of change, but it's still not European-...