Small multifamily is where many Puget Sound investors build durable wealth, and 2026 offers a specific opening: apartment values sit near $239,000 per unit, cap rates have widened to roughly 5.7 percent regionally, and new state laws have legalized more density than the region has allowed in decades. Getting in rewards understanding a few structural rules first. Here is how to approach small multifamily here.
Two Properties, Two Different Games
The most important distinction in multifamily is between two-to-four-unit properties and buildings of five units or more, and the two behave like different asset classes.
Two to Four Units
A duplex, triplex, or fourplex is financed and valued like a house. You can use residential financing, typically a 30-year mortgage with a smaller down payment than commercial loans require, and an owner-occupant reaches the most favorable terms available. Value comes from comparable sales: an appraiser looks at what similar plexes nearby sold for, not at the income the building produces. That keeps them within reach of first-time investors and ties their price to the demand that moves the wider housing market.
Five Units and Up
At five units the property crosses into commercial territory. Financing shifts to commercial loans, which usually mean larger down payments, shorter terms, and qualifying on the building's income, not your salary. Value comes from the capitalization rate, the net operating income divided by price. Raise income or cut expenses and you raise the value directly, which is why these buildings reward active management, unlike a single house.
What the Numbers Look Like Now
Apartment pricing in early 2026 gives you a clean benchmark. Across the Puget Sound, five-plus-unit buildings traded around $239,000 per unit at an average cap rate near 5.7 percent in Q1 2026. County by county, the yield gap is clear:
- Pierce County leads at roughly 6.5 percent, the strongest income return in the region.
- Snohomish County sits near 5.9 percent.
- The regional average runs about 5.7 percent.
- Seattle compresses to around 5.5 percent, where high prices trade current yield for appreciation.
Two-to-four-unit plexes are not tracked as their own category, because they price off residential comparable sales. Their yields tend to land at or a little below that 5.5 to 5.7 percent range, so a plex is rarely a high-cash-flow machine on day one. The return builds through rent growth, loan paydown, and the improvements you make over time.
The HB 1110 Upside
A 2023 state law, HB 1110, has quietly changed what you can build on an ordinary lot. Codified at RCW 36.70A.635, it requires larger cities to allow middle housing where zoning once permitted only single-family homes. Cities of 75,000 or more must allow at least four units per lot, and up to six near major transit or when some units are affordable. Cities between 25,000 and 75,000 must allow at least two, and four near transit. Most central Puget Sound cities brought their zoning into compliance around mid-2025.
For an investor, this is optionality that did not exist a few years ago: a single-family lot in Kent, Tacoma, or Everett may now legally support a duplex, triplex, or fourplex, which changes what a tired house on a large parcel is worth. Accessory dwelling units add another layer: Washington has pushed cities to permit them broadly, so a backyard cottage or a converted basement can add an income stream on property you already own.
House-Hacking a Plex
The most efficient entry into multifamily is to live in it. Buy a two-to-four-unit property, occupy one unit, and rent the others. Owner-occupants qualify for residential financing on far better terms than an investor putting 25 percent down, and the tenants help carry the mortgage while you build equity.
There is a second advantage specific to Washington. An owner-occupied duplex, triplex, or fourplex is exempt from the state rent-increase cap, so you keep pricing flexibility on the units you rent. That exemption does not extend to corporate, LLC, or REIT owners, so it rewards the owner who lives on site. House-hacking is how many Puget Sound investors turn a first purchase into the down payment for the next.
Where to Look: Yield or Appreciation
Your target submarket should follow your goal.
- For yield, look to the more affordable markets north and south of Seattle: Tacoma, Everett, and Lakewood. Lower purchase prices against rents near $1,668 in Tacoma, $1,871 in Everett, and $1,664 in Lakewood produce the region's stronger cash returns, consistent with Pierce County's 6.5 percent cap rates.
- For appreciation, look at the fast-growing South King County cities like Kent and Auburn. Prices there, roughly $590,000 in Kent and the mid-$500,000s in Auburn, sit below Seattle and the Eastside, and improving transit and job access position them for growth even when current yields are thinner.
A cash-flow buyer and an appreciation buyer can study the same fourplex and reach opposite, equally correct conclusions.
Underwriting Around the Rent Cap
Washington's rent stabilization law, HB 1217, has to sit inside your underwriting now. Since May 2025, annual increases on existing tenants are capped at the lesser of 7 percent plus inflation or 10 percent, which sets the 2026 maximum at 9.683 percent. You cannot raise rent at all in a tenancy's first 12 months, and any increase requires 90 days written notice, not the 60 days landlords once used.
Two effects follow. First, a value-add plan that leans on pushing rents to market quickly moves slower than the spreadsheet suggests, so model gradual increases inside the annual cap. Second, buildings under 12 years old are exempt, which makes newer product more flexible on rents but usually pricier to buy. Underwrite to the rents you can legally charge on the schedule the law allows, and the deal that still works is the one worth pursuing.
Small multifamily in the Puget Sound is a patient game in 2026. Cap rates have widened enough to make the numbers interesting, new zoning has opened options that were closed until recently, and owner-occupants hold a real edge through financing and the rent-cap exemption. The investors who do well match the property type to their financing, the submarket to their goal, and the underwriting to the law as it actually reads.
At Nations Realty, we help investors evaluate plexes and small apartment buildings across King, Pierce, and Snohomish counties, from running the cap-rate math to weighing an HB 1110 development play. If you are considering small multifamily, contact us to talk through which strategy and submarket fit your goals.