A duplex’s real monthly cost is defined as everything you pay to own it, the loan payment, property taxes, insurance, and mortgage insurance, minus the rent from the unit you don’t live in after a maintenance and vacancy allowance. In the 2026 data run, that number came to $639 a month for the example deal in Rochester, $584 in Syracuse and $1,416 in Grand Rapids, whose entry prices are $160,000, $198,000 and $279,000.
Rates in this post are a snapshot. The payment figures below are calculated at a 30-year fixed rate of 6.66%, the Freddie Mac Primary Mortgage Market Survey average for the week ending July 30, 2026. Rates have moved since; the figures here have not been recalculated.
Here is the part that surprises people: the most expensive building in this comparison produces the worst monthly result, and the cheapest one doesn’t produce the best. I pulled these three price tiers from my own 2026 data run, where every listing in each metro went through the same seven screening checks. The prices are each metro’s entry price, where a quarter of the surviving listings sit below. The monthly figures are for each metro’s example deal, not for a building at that price.
Three real price tiers, side by side
| Rochester, $160,000 | Syracuse, $198,000 | Grand Rapids, $279,000 | |
|---|---|---|---|
| Cash at 3.5% down | $5,600 | $6,930 | $9,765 |
| Renting comparable space | $1,202/mo | $1,300/mo | $1,312/mo |
| Owning, after tenant rent | $639/mo | $584/mo | $1,416/mo |
| Kept (or lost) vs renting | +$563/mo | +$716/mo | −$104/mo |
| State down payment assistance up to | $15,000 ($30,000 under DPAL Plus) | $15,000 ($30,000 under DPAL Plus) | $10,000 |
Where these numbers come from
What each column is, and what FHA means here
Each column pairs the metro’s entry price with the monthly figures of the example deal that survived my screen: checks on price, the FHA loan limit for that metro and unit count, price per square foot, rental yield, neighborhood violent crime, abandoned property, and housing quality.
FHA is the Federal Housing Administration, the loan program that lets you buy a two-to-four-unit building with 3.5% down as long as you live in one unit. The monthly figures are financed at the data run’s 6.66% 30-year fixed rate and include mortgage insurance (MIP), the monthly fee FHA charges on low-down-payment loans. Rates move weekly, so treat the monthly numbers as a snapshot of the 2026 run, not today’s quote.
“Owning, after tenant rent” is the number I care most about. It is your full payment, principal, interest, taxes, insurance and mortgage insurance, minus what the other unit brings in after a maintenance and vacancy allowance. I call it effective housing cost, and it is the answer to “what will this actually cost me every month.”
The $160,000 tier: Rochester
Five and a half thousand dollars down buys an entry-priced building in Rochester, and the example deal there, a $148,000 two-unit, costs about $639 a month to own after the other unit’s rent, against $1,202 to rent comparable space. That is $563 a month kept while building equity.
New York’s SONYMA program can add up to $15,000 toward the down payment, or up to $30,000 under DPAL Plus if your household is under its income limit, $67,140 for one or two people in Monroe County outside target areas. The $30,000 is more than five times the required down payment, so check that limit first.[S1] You can run this tier through my calculator with your own rent and rate assumptions.
The $200,000 tier: Syracuse
Here is the first surprise: the Syracuse example deal is a $179,900 building, about $32,000 more than Rochester’s $148,000, yet it keeps you $716 a month against renting, the best result of the three. The building costs more, but the rent the other unit earns covers a bigger share of the payment. Cheapest is not automatically best. Try the $198,000 tier yourself.
The $280,000 tier: Grand Rapids
The second surprise: the example deal in Grand Rapids, a $464,900 three-unit, costs $1,416 a month to own after the rent from the other two units, $104 more than renting the same space. Prices there have climbed faster than rents. It can still make sense if you want durability and equity in a growing market, but it fails the “own for less than you rent” test the other two pass. Check the math on this tier.
The pattern: price does not decide the outcome
The priciest building here, Grand Rapids’ $464,900 example deal, bought the worst monthly result. What decides the outcome is the ratio between what buildings cost and what the second unit earns in that market. Rochester and Syracuse rents cover most of a small payment. Grand Rapids rents cover less of a much larger one. This is why I screen metro by metro instead of assuming a bigger budget means a better deal.
What you actually need at closing
The 3.5% figures above are the down payment only. Closing costs add roughly 2% to 5% of the price on top. Down payment assistance (DPA), state programs that grant or lend part of your closing cash, can cover a large share here: up to $15,000 in New York ($30,000 under DPAL Plus, which has an income limit) and up to $10,000 in Michigan for eligible owner-occupant buyers of two-to-four-unit homes.
Frequently asked questions
How much does a duplex cost per month?
In the 2026 data run, the example deal on each metro’s page cost $639 a month to own after tenant rent in Rochester, $584 in Syracuse and $1,416 in Grand Rapids (entry prices $160,000, $198,000 and $279,000). The number depends far more on the local price-to-rent ratio than on the sticker price.
Is a more expensive duplex a better deal?
Not by default. In this comparison the $198,000 tier produced the best monthly result and the $279,000 tier produced the worst. What matters is how much of the payment the other unit’s rent covers, not the price of the building.
How much money do I need to buy a duplex with FHA?
3.5% of the purchase price as a down payment if you live in one unit, plus closing costs of roughly 2% to 5%. On the tiers above that is $5,600 to $9,765 down, and state down payment assistance can cover some or most of it for eligible buyers.
Worth knowing alongside these numbers: starting in January 2027, large investors are barred from buying two unit buildings. I covered the detail, including the exceptions that soften it, in the ROAD Act investor ban and why it covers duplexes.
The fastest way to know what a duplex would cost you is to run a real listing instead of a hypothetical. The free house hacking calculator takes a price, a rent, and your loan terms and returns your effective monthly cost in a few seconds, no account, no email required. When you are done, the “Copy link to these results” button gives you a link that reopens your exact numbers.
Keep going
The full metro breakdowns behind each tier: Rochester, Syracuse, and Grand Rapids. For the metric this post is built on, see effective housing cost: the one number house hackers should track. New to the idea entirely? Start with what is house hacking? A plain-English guide.
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Sources
- Listing screens, entry prices, rents, and monthly figures: my 2026 metro data run, methodology and per-metro details on the linked metro pages.
- Loan terms and mortgage insurance: FHA 3.5% minimum down payment and MIP schedule, HUD Handbook 4000.1.
- The 6.66% rate reflects the Freddie Mac 30-year fixed average at the time of the data run (Primary Mortgage Market Survey); rates move weekly.
- [S1] New York State Homes and Community Renewal (SONYMA), read 21 September 2026. hcr.ny.gov.
I’m not a CPA or a financial advisor, just someone who runs these numbers on my own property and shares what I find. Verify anything specific to your situation with your own lender or accountant.
Got a deal you’re trying to price? Send it my way, or subscribe for more of this as I publish it.
Frequently asked questions
What is PITI?
PITI is defined as the four components of a monthly mortgage payment, principal, interest, taxes and insurance, and it is the figure to compare against rent rather than principal and interest alone.