How to Buy a Duplex, Live in One Side, and Rent the Other

The step-by-step version of the most reliable first move in real estate: buying a two-unit home, living in half, and letting a tenant cover most of your payment.

Buying a duplex and renting the other unit is the cleanest entry point into real estate I know of, and it’s the move that changed my own finances. You live in one side, a tenant lives in the other, and their rent covers a large share of your mortgage. You end up owning a real asset while paying far less than you would to rent, and you learn how being a landlord works on the easiest possible setting, with your tenant fifteen feet away.

I did exactly this. After about thirteen months living in a van, then a small starter home, eventually I bought a $470,000 duplex, lived on one side, and rented the other. This post is the practical how-to, start to finish.

If you want the concept first, read What Is House Hacking? Then come back here for the steps.

Why a duplex specifically

A duplex hits a sweet spot. It’s still bought with the same loans and low down payments available to regular homebuyers, because you’re going to live there, but it comes with a built-in rental unit. That combination is what makes the math work.

The key advantage is the loan. When you live in the property, you can use owner-occupied financing instead of the more expensive investor loans. An FHA loan lets you buy a one-to-four-unit home with as little as 3.5 percent down, according to the U.S. Department of Housing and Urban Development, as long as you live in one of the units. On a duplex, that’s a fraction of what an investor would need to put down on the same building. I’ve written a full breakdown of that loan here: FHA House Hacking With 3.5% Down.

One useful thing to know: for a duplex, the FHA has no special income hurdle beyond normal qualifying. It’s only on three- and four-unit properties that the FHA adds a “self-sufficiency test” requiring the rent to cover the whole payment. Duplexes skip that, which is one more reason they’re the friendliest starting point.

Step one: figure out what you can qualify for

Before you look at a single listing, find out where you stand with a lender. Three things decide it: your credit, your documented income, and your savings. Credit and income are usually the real gatekeepers, not the down payment, so get them in view early because they’re the slowest to fix.

Get pre-approved with a lender who has actually done FHA and first-time-buyer loans. That pre-approval tells you your real budget and makes your offers credible. If you’re not sure you’re ready, the readiness roadmap tool walks through your credit, income, and savings and tells you which lever to pull first.

Step two: line up your down payment help

Most people assume they have to save the entire down payment alone. Often they don’t. As of April 2026 there were 2,679 homebuyer assistance programs nationwide, according to Down Payment Resource, and 934 of them allowed the purchase of two-to-four-unit properties, exactly the kind of building you’re after. I used a county first-time-buyer program to get into my first home, an $185,000 starter I never could have bought otherwise.

These programs are poorly advertised, so search your state housing finance agency and your county along with “first-time homebuyer assistance,” and ask your lender which ones you might qualify for. It’s worth an afternoon.

Step three: analyze the deal before you fall in love

This is where people go wrong. They find a duplex they like and then talk themselves into the numbers. Do it the other way around.

For any duplex you’re considering, you want to know what your actual monthly cost will be after the other unit’s rent comes in. Your payment is usually called PITI: principal, interest, taxes, and insurance. On my duplex, PITI runs about $2,880 a month. The upstairs tenant pays around $1,200, and a basement short-term rental covers more on top of that, which dropped my own out-of-pocket cost to a few hundred dollars.

You don’t need the rent to cover 100 percent of the payment for a duplex to be a great deal. You just need your share to beat what you’d otherwise pay in rent. Run every candidate through the free house hacking calculator with the price, the realistic rent for the other unit, and your loan terms. To get realistic rent, look at what similar units nearby actually lease for rather than guessing. For a deeper walk through the math, I broke down a real example here: The Duplex Math Nobody Shows You.

Step four: make the offer and get through closing

Once the numbers work, make your offer at a price the analysis supports, not the one that makes the seller happiest. Get a real inspection, because in a duplex you’re buying two of many things: two kitchens, sometimes two furnaces, more plumbing and roof to fail. Budget for that reality.

Expect a few thousand dollars in closing costs, inspection fees, and an emergency buffer beyond the down payment. You want cash left over after you close, not a bank account scraped to zero.

Step five: be a decent landlord and hold on

After you close, your job is to keep a good tenant paying fair rent in a well-maintained unit. Screen tenants properly, respond to repairs, and follow your state’s rules on leases and notices. Living next door makes this easier in some ways and more personal in others; I wrote about that here: What It’s Like Living Next to Your Tenants.

Then you let time do the work. The tenant helps pay down your loan every month, the property tends to appreciate, and your own housing cost stays low. That combination is the quiet engine that builds equity.

A realistic word on today’s market

I locked a 4 percent rate when I bought. Rates are higher now, which makes the monthly numbers tighter, and in some areas the FHA self-sufficiency rules or high prices will make a given deal not work. That’s fine. The process above still holds; you just have to run real numbers at today’s rates and only move on a property where the math actually works. Some won’t. The right one will.

The point

A duplex is the most beginner-friendly real estate purchase because it uses cheap owner-occupied financing and comes with a tenant who pays down your loan. Qualify first, find your down payment help, analyze every deal before you get attached, close with cash to spare, and then be a steady landlord. Do that and you own an appreciating asset while paying a fraction of what renting would cost.

Sources

• FHA Loans — U.S. Department of Housing and Urban Development
• FHA Self-Sufficiency Test for 3- and 4-Unit Properties — Mortgage Research Center
• Down Payment Assistance Reaches 2,679 Programs Nationwide (Q1 2026) — Down Payment Resource

I’m not a guru and there’s nothing to buy here. The tools are free. If you want more posts like this as I write them, subscribe on the blog, or if you’ve found a place and want a second pair of eyes on the numbers, send me the deal.

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