Microhousing Index: Micros by the Numbers

The Microhousing Index is an homage to Harper’s Index which for years has told an often satirical story using only data points. The story the numbers tell is clear: the proposed changes in Councilmember O’Brien’s legislation will mean fewer (if any) microhousing options that will be more expensive. Tell the City Council (e-mail Councilmember Mike Obrien here) to keep microhousing an option for those that want it.

HUD maximum housing price for person earning 60 Percent of Area median income renting a studio apartment: $927[1]
Typical monthly microhousing rent (including utilities): $850[2]
Typical micro vacancy rate: 0[3]
Councilmember Mike O’Brien’s proposed micro minimum: 220 net square feet (NSF)
Estimated price of microhousing with new minimum: $1,250[4]
Number of projects completed or in process: 68[5]
Total people housed when completed: 3,609[6]
Number of units had O’Brien’s minimum been in effect: 2,400[7]
Number of buildings in low-rise zones: 44[8]
Number of buildings in mid-rise zones: 10[9]
Number of buildings in NC, C, and DMC zones: 14[10]
Number of buildings in single-family zones: 0[11]
Percentage of residents that own cars: 25[12]
Estimated number of cars owned by microdwellers: 902[13]
New parking spots required in new proposal: 1,804[14]
Estimated cost to build underground parking spot: $40,000[15]
Additional revenue needed per month, per spot, to cover parking costs: $321[16]
Typical number of sinks in a microhousing unit: 1
Number of additional sinks if Councilmember Rasmussen’s sink requirement was in effect: 3,609[17]
Total estimated cost of one additional sink fixture for all microhousing: $644,892.21[18]

 


[1] Seattle Office of Housing, 2014 Affordable Housing Income Limits
[2] Taken from survey of developers on rents on area microhousing
[3] This varies month to month, but most buildings have waiting lists based on developer survey
[4] Rents will rise because larger units will mean fewer units, and that smaller number of units has to generate rent revenue to cover the same financing, construction, and land costs.  In addition, any level of Design Review adds cost, time, and risk.
[5] Based on the Department of Planning and Development’s Microhousing Tracker,
[6] Ibid.
[7] This is a conservative estimate based on a survey of several microhousing developers reviewing their own projects had the O’Brien minimum been in effect.
[8] Based on the Department of Planning and Development’s Microhousing Tracker
[9] Ibid.
[10] Ibid.
[11] Ibid.
[12] Based on a census of residents taken at lease signing.
[13] This figure is based on 25 percent of the total number of rooms on the DPD tracker.
[14] For example, Councilmember O’Brien would impose a .5 (one spot for each room) parking requirement outside transit areas. This example is based on the requirement being implemented for all microhousing projects, in or out of transit areas.
[15] Urban Land Institute (ULI)
[16] From the Victoria Transportation Policy Institute, cited by King County’s Right Size Parking Project
[17] Councilmember Tom Rasmussen has expressed worries that there aren’t enough sinks, authoring a memo a year ago asking why DPD didn’t require at least two.
[18] Estimate based on just the fixture purchased retail. Plumbing and other capital costs would increase this estimate.

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