Seattle Multifamily Loan Guide: Duplex to Fourplex

A Seattle multifamily loan on a two, three, or four unit building is still a residential mortgage. Conventional, FHA, and VA programs all reach four units, which means a duplex in Wallingford or a fourplex near the U District can be bought with the same categories of financing people use for a single-family house. What changes is the arithmetic inside them, and it changes at every unit count.

This is the more common transaction, and the more misunderstood one. I wrote separately about apartment buildings of five units and up, where the property leaves residential lending entirely and becomes commercial. Everything below the fifth unit stays on this side of the line, and that is a genuinely different world: published guidelines, agency terms, thirty-year fixed structures, and down payments that can be far smaller than investors expect.

Three things decide what your loan looks like: how many units the building has, whether you will live in one of them, and how large the loan is. That third one is where Seattle buyers get surprised, and it is the part almost no national article covers.

One framing note. Every figure on this page is current as of September 2026 and subject to change. Agency and FHA guidelines are revised periodically, individual lenders apply their own overlays, and all financing is subject to qualification, credit approval, and underwriting.

What a Seattle Multifamily Loan Covers: Two, Three, and Four Units

The residential and commercial boundary sits between four units and five. A Seattle multifamily loan on a duplex, triplex, or fourplex is underwritten as residential real estate, which means the lender is primarily measuring you: your income, your obligations, your assets, and your credit profile as one factor among several. The building's income supports that picture rather than replacing it.

That has practical consequences worth stating plainly. Long fixed-rate terms are available. There is no balloon payment sitting at the end of the loan the way there commonly is on commercial multifamily debt. Prepayment on agency loans is generally open. Disclosures are standardized, so you get a Loan Estimate you can compare against another lender's. And the down payment can be dramatically smaller than the commercial world requires, provided you meet the conditions described below.

Seattle has a real supply of this stock. The University District carries older houses long ago converted into legal multi-unit rentals along with purpose-built small buildings near campus. The eastern edge of Capitol Hill, toward 23rd Avenue and the Central District, holds duplex and triplex inventory mixed into the single-family blocks. Wallingford has scattered two and three unit conversions of its Craftsman stock. These are ordinary listings that ordinary buyers can finance.

Seattle Multifamily Loan Limits by Unit Count in King County

Loan limits rise with unit count, and in King County they rise a long way. This is the single most useful table for anyone shopping a Seattle multifamily loan, because it defines both the ceiling on agency financing and, just as importantly, the point at which your loan becomes a high-balance loan with different rules.

King County is a high-cost area. The Federal Housing Finance Agency sets a county conforming limit above the national baseline, and the Federal Housing Administration sets a county limit that, in King County, lands on exactly the same numbers. Both are 2026 figures.

Figures are 2026 limits published by the Federal Housing Finance Agency and by HUD through the FHA mortgage limits lookup. Limits are reset annually and are subject to change. Confirm the current figure for your unit count before you write an offer.

Notice how much room those numbers give you. A fourplex in Seattle can carry agency financing above two million dollars. For most triplex and fourplex buyers in this market, the loan limit is not the binding constraint at all. Something else is, and the next two sections are about what.

Occupancy Changes a Seattle Multifamily Loan More Than Anything Else

An owner-occupied triplex and an investment triplex are materially different loans on the same building. The property has not changed. Your relationship to it has, and every guideline in the file keys off that.

If you will live in one of the units as your principal residence, the property is a principal residence for underwriting purposes even though the other units are rented. That unlocks the smallest down payments, the most favorable pricing, and access to FHA and VA. If you will not live there, it is an investment property, which commonly requires a materially larger down payment, carries meaningful loan-level price adjustments, and generally requires reserves. FHA and VA are not available on a purchase you will not occupy.

The occupancy requirement is not a formality. On an FHA loan, HUD's rule is explicit: at least one borrower must occupy the property within sixty days of signing the security instrument and intend to continue occupancy for at least one year. Conventional owner-occupied financing carries a comparable occupancy certification. Buying a fourplex on owner-occupied terms with no intention of moving in is occupancy fraud, and I mention it only because the internet is careless about the distinction.

This is the reason house hacking is such a durable strategy in Seattle. Living in one unit while the others carry a share of the payment is the only way most people ever access small multifamily on a small down payment. I wrote about that path in detail in my guide to house hacking in the U District. If the plan is a pure rental from day one, my guide to investment property loans in Seattle is the better starting point.

Down Payment on an Owner-Occupied Seattle Multifamily Loan

This is where the guidelines moved, and where a lot of published advice is simply out of date.

Fannie Mae updated its policy for Desktop Underwriter casefiles submitted on or after the weekend of November 18, 2023. The maximum loan-to-value, combined loan-to-value, and home equity combined loan-to-value ratios for two to four unit principal residence purchase and limited cash-out refinance transactions were raised to 95 percent. In plain terms, an owner-occupied duplex, triplex, or fourplex can be purchased with as low as 5 percent down, subject to qualification and to the conditions below. The prior ceilings were substantially lower for three and four unit properties, which is why so much older commentary still says a fourplex requires twenty or twenty-five percent down for an owner-occupant.

Two conditions travel with that policy, and both matter in Seattle. Fannie Mae stated that the change does not apply to high-balance mortgage loans, and does not apply to loans that are manually underwritten. The second condition is easy to satisfy for most buyers. The first one is the trap, and it deserves its own section.

FHA takes a different route to a similar place. FHA's maximum loan-to-value on a purchase is 96.5 percent, so 3.5 percent down, and FHA reaches two to four units on the same terms it reaches a house, provided you occupy one unit. FHA also carries mortgage insurance with a structure that differs from conventional private mortgage insurance, and on most current FHA loans that insurance does not fall away with equity the way conventional coverage can. The comparison between the two programs is covered on my FHA loans in Seattle page, and it is worth running both before you choose.

The High-Balance Trap in a Seattle Multifamily Loan

A high-balance loan is an agency loan larger than the national baseline conforming limit for that unit count, up to the higher limit published for a high-cost county. King County is a high-cost county, so every one of those bands from the table above is live here. And the 95 percent option described above does not reach them.

Work through what that means on a duplex. The national baseline two-unit limit is $1,066,250. At 95 percent financing, staying at or under that baseline puts the ceiling on your purchase price at roughly $1,122,000, before accounting for any financed mortgage insurance premium. Above that price, the loan becomes high-balance, and the 5 percent down option is off the table even though the property is still comfortably under the $1,361,800 King County duplex limit. The same arithmetic puts the practical ceiling near $1,356,000 on a triplex and near $1,686,000 on a fourplex. These figures are illustrative, calculated from published 2026 limits as of September 2026, and subject to change.

So there is a band on every Seattle multifamily loan where the property is agency-eligible but the low down payment is not available. Seattle small multifamily prices land inside that band often enough that I check it on nearly every one of these files before I quote anything. The practical consequence is that two duplexes fifty thousand dollars apart in price can require very different amounts of cash, and the more expensive one is not always the one that needs more.

High-balance loans also have to be underwritten through Desktop Underwriter. Fannie Mae's guidance on high-balance mortgage loans states that all loans must be underwritten through DU, and that loans must meet the ratios published in the current Eligibility Matrix. Maximum ratios for high-balance two to four unit transactions are lower than the conforming 95 percent and are set in that matrix rather than by me, so I quote them from the current version at the time we run your file rather than from memory.

If the numbers push you past the county limit entirely, you are into jumbo territory, and the rules change again. My guide to high-balance versus jumbo in King County covers that boundary.

FHA on Two to Four Units, and the Self-Sufficiency Test

FHA has a rule on three and four unit properties that has no conventional equivalent, and it ends more Seattle deals than any loan limit does.

HUD's Handbook 4000.1 requires that on a three to four unit property, the PITI divided by the monthly net self-sufficiency rental income may not exceed 100 percent. Net self-sufficiency rental income is calculated using the appraiser's estimate of fair market rent from all units, including the unit the borrower chooses to occupy, minus the greater of the appraiser's estimate for vacancies and maintenance or 25 percent of the fair market rent. The lender must also obtain a completed form HUD-92561.

Read that carefully, because the shape of it matters. The building has to carry its own full payment out of 75 percent of the total market rent, counting the unit you are living in and paying nothing for. In a market where Seattle purchase prices have risen faster than rents for most of the past decade, a great many triplexes and fourplexes simply do not pass. I have seen well-priced U District triplexes fail this test by a wide margin.

Two points follow from it. First, the test does not apply to two unit properties, which is one reason duplexes are the most FHA-friendly small multifamily in Seattle. Second, it is worth pre-screening a three or four unit property against this test before you spend money on an appraisal, because the appraiser's rent estimate is what governs and you will not know the outcome until the report lands. Send me the address and the rent roll early and I will tell you how close it looks.

VA is the other owner-occupied path and reaches four units as well, with its own occupancy and entitlement rules. My VA loans in Seattle page covers that program.

How Rental Income Counts Toward a Seattle Multifamily Loan

Everyone asks whether the rent helps them qualify. On a conventional Seattle multifamily loan the answer is yes, with adjustments, and the adjustments are specific rather than a matter of judgment.

For a purchase, Fannie Mae's method is to multiply monthly gross rent by 75 percent to reach net rental income, then subtract the property's full PITIA. The 25 percent haircut is the vacancy and maintenance allowance, and it is applied whether or not the units are currently occupied and whether or not you intend to self-manage. Market rent on a two to four unit property is documented on Form 1025, the Small Residential Income Property Appraisal Report, which is a different and more involved appraisal form than the one used on a house.

There is a second requirement that has caught several of my clients off guard. Fannie Mae permits positive rental income to be used as qualifying income only where the borrower has at least twelve months of property management experience. A borrower with no prior property management experience, or less than twelve months of it, may use the qualifying rental income only to offset the property's PITIA rather than to add to income. That distinction can be the difference between an approval and a decline for a first-time landlord, and it is a strong argument for talking to a lender before you fall in love with a fourplex.

If your personal tax returns make conventional qualifying difficult, the property-based route is worth a look. My guide to DSCR loans in Seattle covers qualifying on the property's cash flow instead of your income, which is a common answer for investors with heavy depreciation and business deductions. And if you already own several rentals, the reserve and slot rules that come with scale are covered in my guide to financing your fifth through tenth rental.

The Appraisal Problem: Thin Small-Multifamily Comps in Seattle

I want to be honest about the part of these transactions that goes wrong most often, and it is not the underwriting. It is the appraisal.

Two to four unit properties are appraised on Form 1025, and that report needs comparable sales of similar small multifamily properties along with a rent schedule for the units. Seattle does not produce many of those sales. In a given quarter a neighborhood may see dozens of house sales and two or three duplex sales, and a triplex comp may have to come from a mile away or from several months back. The pool of appraisers who regularly do 1025 work is also smaller than the pool who do standard residential reports.

Both facts push the same direction: these appraisals take longer to schedule and longer to complete, and they carry more valuation uncertainty than a single-family appraisal in the same neighborhood. Build that into the contract rather than discovering it at day eighteen of a thirty-day close. If the number comes in under contract price, the resolutions are the same four available on any purchase, and I walk through them in my guide to a low appraisal in Seattle.

One more practical note. Condition matters more on this stock than on newer housing. A meaningful share of Seattle's duplex and triplex inventory was built before 1940 or was converted from a single-family house decades ago, so underwriting attention lands on the roof, the electrical service, the heating system, and whether the conversion was permitted. An unpermitted third unit in a house sold as a triplex is a real and recurring problem, and it is better found during your inspection contingency than during underwriting.

Registering the Rental Side After You Close

Closing the loan is not the end of the obligations, and this one is local. Seattle's Rental Registration and Inspection Ordinance requires owners to register rental housing units with the city, with limited exemptions. Registered properties are selected for an inspection requirement, owners of multi-unit properties may have all units inspected or a sample of them, and the city gives notice ahead of a required inspection.

None of that affects your loan approval. It affects what you are signing up for as an owner, and buyers moving from a single-family house into their first duplex are frequently unaware of it. Current registration requirements, exemptions, fees, and inspection timing are set by the City of Seattle and administered by the Seattle Department of Construction and Inspections, so confirm the current rules for your property with SDCI rather than relying on this summary.

Washington's landlord-tenant statutes and Seattle's own tenant protections also apply to you the moment you own occupied units, including rules about existing tenancies you inherit at closing. Those are questions for an attorney, not for a loan officer, and I would rather point you to one early than guess.

Where a Seattle Multifamily Loan Stops and Commercial Begins

The fourth unit is a hard stop. A five unit building is commercial collateral, and no residential program reaches it, including FHA and VA, and including the case where you intend to live in one of the units.

That boundary is worth knowing before you shop, because it changes what a listing is worth to you. A fourplex and a five unit building on the same block are not competing on price. They are competing on down payment, on term structure, on whether you get a thirty-year fixed rate or a balloon, on how long the transaction takes, and on how much documentation the seller has to produce. I laid out the commercial side in my guide to Seattle apartment loans on five units and up.

There is also a path below two units that people overlook. A single-family house with a legal accessory dwelling unit can behave a great deal like a duplex from an income standpoint while staying a one-unit property for financing, which keeps the simplest programs and the lowest down payments available. Seattle has reformed its ADU rules substantially, and the inventory is growing. My guide to ADU financing in Seattle covers it.

Here is how I would use all of this. Before you tour anything, get the unit count, the asking price, and the current rent roll, and get a read on which financing band the deal falls into. A pre-approval written against the wrong occupancy or the wrong program is not much use in a competitive offer, and small multifamily sellers in Seattle read those letters closely. If the down payment is coming partly from family, the sourcing rules in my guide to gift funds apply here the same as on a house. And the county-level program landscape is collected on my King County home loan programs page.

Frequently Asked Questions About a Seattle Multifamily Loan