Can I Buy a Duplex, Triplex, or Fourplex With FHA?

Yes — FHA explicitly allows 2-, 3-, and 4-unit primary residences at the standard 3.5% minimum down payment, as long as you actually live in one of the units. Two extra rules matter: for 3- and 4-unit properties, the deal has to pass FHA's self-sufficiency test (the property's net rental income must cover the full PITI on its own); and 75% of the fair-market rent on the units you don't occupy can be used as qualifying income to help you qualify. That last piece — the rental-income offset — is where most loan officers leave money on the table, because they either don't apply it or don't apply it correctly. Done right, 2–4 unit FHA is one of the most powerful house-hacking strategies still available with low money down.

The handbook view (what the rules actually say)

FHA's multi-unit rules live in one section of HUD Handbook 4000.1, and they're unusually clear:

• Owner-occupancy requirement: The borrower must occupy one of the units as their principal residence within 60 days of closing and continue to do so for at least one year. (Source: HUD Handbook 4000.1, II.A.1.b — Eligible Properties, and II.A.8.e — Two- to Four-Unit Properties.)
• Down payment / LTV: Same 3.5% minimum down (96.5% maximum LTV) as single-family FHA. Multi-unit doesn't carry a higher down payment requirement under FHA itself. (Source: HUD Handbook 4000.1, II.A.2 — Maximum Mortgage Amounts.)
• Self-sufficiency test (3–4 unit only): For triplex and fourplex properties, the property's net rental income must equal or exceed the proposed monthly mortgage payment (PITI). Net rental income is calculated as 75% of the appraiser's estimated fair-market rent for all units (including the unit the borrower will occupy), minus the principal residence's PITI. Duplexes are NOT subject to the self-sufficiency test. (Source: HUD Handbook 4000.1, II.A.8.e and II.A.5.a — Effective Income.)
• Rental-income offset for qualifying: For 2–4 unit properties, 75% of the appraiser's fair-market rent on the non-owner-occupied units can be added to qualifying income (or used to offset the subject-property PITI on the DTI calculation, depending on the AUS treatment). (Source: HUD Handbook 4000.1, II.A.5.a.iii — Calculation of Effective Income.)
• Loan limits: FHA county loan limits are higher for 2-, 3-, and 4-unit properties than for single-family — meaningfully so in many metros, which is part of why the strategy works at higher purchase prices. (Source: HUD county loan-limit tables at entp.hud.gov/idapp/html/hicostlook.cfm.)
• Reserves: 3- and 4-unit FHA files require three months of PITI in reserves after closing; duplexes do not have a specific FHA reserve requirement beyond standard AUS findings. (Source: HUD Handbook 4000.1, II.A.4.d — Reserves.)

The plain-English translation

What this actually means for a buyer thinking about house-hacking a 2–4 unit:

• You can buy a duplex with 3.5% down and rent the other side. Same down payment as a single-family FHA. You live in one unit, rent the other, and 75% of the fair-market rent on the rented unit helps you qualify.
• 3- and 4-unit is the same down payment, but the property has to pay for itself. The self-sufficiency test means in expensive metros where rents haven't kept up with prices, a triplex or fourplex might not qualify under FHA even if you personally would qualify. In rent-strong metros, the test is easy to pass.
• The appraiser's rent schedule is critical. FHA appraisals on 2–4 unit properties include a separate rental-income analysis. A weak or sloppy rent schedule from the appraiser can sink the self-sufficiency test, even when the actual market rents are higher. Choice of appraiser (and the comps the appraiser pulls) matters more here than on a single-family.
• You must actually live there. The occupancy requirement isn't cosmetic — it's a representation on the loan application. Buying a 4-plex on FHA, never moving in, and renting all four units is loan fraud. After the one-year occupancy period, you can move out and keep the loan.
• FHA MIP still applies. All FHA rules around upfront and annual mortgage insurance premiums apply on 2–4 unit FHA loans exactly as they do on single-family.

Lender overlays — where the rules get tighter

The handbook is permissive. Where files go sideways is usually lender-side, not program-side:

• Rental-income-offset misapplication: The single most common error on 2–4 unit FHA files is the loan officer either failing to apply the 75% rental offset at all, or applying it incorrectly. Borrowers who would qualify with the offset get told they don't qualify because the LO ran the file as if the borrower were taking on the full PITI alone.
• Landlord-experience overlays: Some lenders add an overlay requiring prior landlord experience before counting rental income toward qualification. FHA itself does not require this for the owner-occupied unit's rental offset on 2–4 units — it's a lender add-on.
• Self-sufficiency test on duplexes (overlay, not rule): A small number of retail lenders apply the self-sufficiency test to duplexes anyway, even though HUD only requires it on 3–4 unit. That blocks deals the program would have approved.
• Reserves overlays: Beyond the three-month requirement for 3–4 unit, some lenders want six months. Triplex/fourplex buyers should ask up front.
• FICO floor overlays: The same FICO-floor overlay that hits single-family FHA hits multi-unit FHA — HUD allows 580 with 3.5% down, but many retail lenders won't go under 620–640. As an independent broker we shop for the wholesale investor that will actually price the deal at your score.

Self-sufficiency at a glance (3–4 unit only)

A simplified illustration of how the test works. Numbers are illustrative; your actual file uses the appraiser's rent schedule and your actual proposed PITI.

The table is a guideline, not a quote. Real self-sufficiency math uses the appraiser's schedule, the proposed PITI including FHA MIP and escrows, and the underwriter's read of the file. The right move is to identify the property first, get a preliminary rent schedule, and run the math before going under contract.

Which lenders we actually use for this scenario

For a 2-4 unit FHA purchase that pencils out cleanly — meaning the borrower qualifies on income and credit, the property appraises, and the self-sufficiency math works on 3-4 units — I run these through standard FHA wholesale lenders. Same channel as a single-family FHA purchase. The down payment minimum is 3.5% (same 96.5% max LTV as single-family), the borrower has to occupy one of the units as their primary residence for at least a year, and FHA mortgage-insurance rules apply the same way they do on any FHA loan.

The wrinkle is the self-sufficiency test on 3-unit and 4-unit properties. FHA requires that the projected rental income from ALL units (including the one the borrower will occupy) cover the full PITI — principal, interest, taxes, insurance, and HOA if applicable — based on the appraiser's market-rent analysis using a 75% occupancy factor. If the property doesn't self-sustain on that math, FHA won't insure the loan, and you either pivot to conventional (where the test doesn't exist but the down payment is higher) or look at a different property. The self-sufficiency test does NOT apply to duplexes, which is part of why duplexes are the easiest of the four configurations to close on FHA.

For qualifying income on the borrower side, FHA lets you count 75% of the market rent from the non-occupied units toward the borrower's qualifying income, which often makes the deal pencil for a buyer who couldn't qualify for the same purchase price on a single-family basis. That rental-income offset is most of the strategic value of the program.

Real-world cases

I've seen this pattern repeatedly: younger buyer, first home purchase, finds a duplex in an up-and-coming Denver neighborhood — Cole, Globeville, Athmar Park, you name it — moves into one side, rents the other side at market. (Illustrative composite — the specific neighborhood and rent figures vary every time.) Their effective housing cost after collecting rent is meaningfully lower than what they'd pay for a comparable single-family in the same area, sometimes dramatically lower. Three to five years in, they move out, convert the unit they were living in to a rental, and now they own a fully-tenanted duplex with FHA financing at the rate they locked when they were owner-occupied. That's a hard combination to replicate any other way.

The 3-4 unit version is harder because of the self-sufficiency test, but when it works it's even better. I've walked buyers through fourplex purchases where the rents from three units carried the entire mortgage and the buyer essentially lived for free in the fourth unit. Those deals require the right property in the right neighborhood at the right price — they don't grow on trees — but they exist, and FHA is the highest-leverage tool for getting into one with the smallest down payment.

Two things that derail these deals: appraisals that come in low on the market-rent analysis (kills self-sufficiency on 3-4 units), and condition issues that trigger FHA repair conditions the seller won't address. A broker who's worked FHA multi knows which appraisers in each market handle the rent schedules competently and which inspections to push on before going under contract.

How the big retail lenders typically handle this

Most retail lenders will write FHA 2-4 unit loans — they're agency-eligible and the documentation is standard. Where the broker channel differentiates is on the edge cases: borderline self-sufficiency math where the appraiser's rent comparables matter, condition issues that need a creative repair-escrow structure, and borrowers who need the rental-income-offset calculation done right to qualify. Retail LOs who don't work multi-unit regularly often get the income calculation wrong in the borrower's favor — meaning they say you qualify when you don't, and the file blows up in underwriting two weeks before closing.

The product is the same across channels. The execution quality varies. For a 2-4 unit FHA purchase, find a loan officer who's closed at least a handful of them, and ask before you go under contract.