What Is Duplex?
A duplex is a two-unit property: two homes under one roof. It's the most common entry point for house hacking — you live in one unit, rent the other, and an FHA loan lets you put 3.5% down. In Cleveland, a $135,000 duplex might run $1,085/month PITI; rent one unit at $875 and you're out $297/month. Rent both and you're cash flow positive. Duplexes are exempt from FHA's self-sufficiency test (unlike triplexes and fourplexes), so the financing bar is lower.
A duplex is a building with two separate residential units — each with its own entrance, kitchen, and living space — often used for owner-occupancy or as a small rental investment.
At a Glance
- What it is: A single building with two separate residential units, each with its own entrance and living space
- Why it matters: The lowest-unit-count property that qualifies for FHA owner-occupied financing — 3.5% down vs 20%+ for investment
- How to use it: House hack (live in one, rent one) or hold as a small rental; one empty unit = 50% vacancy rate impact
- Common threshold: Budget 5–8% vacancy reserve; median duplex in strong markets (Cleveland, Indianapolis, Birmingham) runs $135K–$185K
How It Works
A duplex gives you two rentable units in one purchase. Side-by-side (two units sharing a wall) or stacked (one above the other) — both qualify for residential financing as long as you live in one.
Financing. An FHA loan lets you put 3.5% down on a duplex. Conventional owner-occupied runs 5%. Investment property loans demand 15–25% down and charge higher rates. That spread is why duplexes dominate the house hacking conversation. And unlike triplexes and fourplexes, duplexes skip FHA's self-sufficiency test — you don't have to prove 75% of gross rent covers PITI. The math is simpler.
Cash flow. Rent one unit, live in the other: your tenant offsets your mortgage. Move out after 12 months and rent both. Your cash flow = gross rent minus PITI, vacancy reserve (5–8%), and operating expenses. One empty unit hits you hard — 50% of your rent roll — so screen tenants well and budget for turnover.
Shared systems. Some duplexes share a water heater, HVAC, or electrical panel. Shared systems mean one failure affects both units. Separate systems give you more control and easier unit-by-unit management. Get a thorough inspection before you buy.
Real-World Example
Cleveland duplex, 2024.
You buy a $135,000 side-by-side duplex with an FHA loan at 6.75%, 3.5% down. PITI: $1,085/month. You live in unit A, rent unit B at $875 (market rate). After a 5% vacancy/maintenance reserve, you net $831 from that unit. Your out-of-pocket: $254/month to live there.
After 12 months you move out. Rent both units at $875 each. Gross rent $1,750, minus 5% reserve: $1,663. PITI $1,085. Cash flow: $578/month. You've turned a primary residence into a cash-flowing rental — and you can repeat with another FHA loan on your next house hack.
Pros & Cons
- Qualifies for FHA 3.5% down — lowest capital barrier for multi-unit
- No self-sufficiency test (unlike 3–4 unit) — simpler underwriting
- Two units = diversification vs single-family (one vacancy doesn't zero out income)
- Easier to manage than a fourplex — fewer tenants, less turnover
- Strong house hacking play in value markets (Cleveland, Indianapolis, Birmingham)
- One empty unit = 50% vacancy — twice the impact of a fourplex with one empty
- Shared walls mean noise; stacked units can have worse sound transfer
- Shared systems (if present) create single points of failure
- Smaller scale than triplex/fourplex — less total rent per property
Watch Out
- Financing risk: Don't assume you'll qualify — run the numbers with your lender before you offer. PITI at 7% is higher than it was at 4%.
- Vacancy risk: One empty unit wipes out half your rent. Budget 5–8% vacancy reserve and have 3–6 months of reserves for both units.
- Inspection risk: Shared plumbing, electrical splits, sound travel — duplexes hide surprises. Test everything. A $4,000 plumbing fix in a shared stack affects both units.
- Overpay risk: In hot markets, duplexes trade at a premium. If the cap rate is below 5% and you're counting on appreciation, you're speculating — not investing.
Ask an Investor
The Takeaway
A duplex is the sweet spot for house hacking: two units, FHA financing, no self-sufficiency test. Live in one, rent one, then move out and rent both. The tradeoff is vacancy — one empty unit hurts. Buy in strong rental markets, screen tenants well, and it's a proven path to your first cash flow-positive rental. From there, scale to BRRRR or more units.