For most first-time investors, the idea of building a sizable rental portfolio feels like a mountain too steep to climb. Real estate rookies often wonder how anyone moves from owning a single-family home to managing ten units without a massive bank account. The answer lies in a repeatable approach known as the stack method a blueprint that blends house hacking, low-down-payment financing, and strategic use of home-equity lines of credit (HELOCs).
In the 2026 episode of the Real Estate Rookie podcast, hosts Ashley Kehr and Tony J. Robinson break down the mechanics of this strategy, showing that a modest cash reserve and disciplined execution can generate a ten-unit portfolio in just a few years. Below we reorganize their conversation into a practical guide you can follow today.
Understanding the stack method at a glance
The stack method is a progressive acquisition model. You begin with a modest single-family house, live in it for a year, then move on to a duplex, a triplex, a four-plex, and so on—essentially doubling the number of units you own each step. The sequence might look like: 1 → 2 → 4 → 8 → 16 units, though most investors aim for a realistic target of ten units before the growth curve flattens. By keeping each new purchase slightly larger than the last, you preserve cash flow, build equity faster, and avoid the overwhelm of buying a large multifamily property right away.
Two key principles keep the stack method sustainable:
- House hacking you occupy a portion of the property and rent out the rest, reducing or eliminating your personal housing cost.
- Low-down-payment financing leveraging FHA or conventional primary-residence loans that require only 3-5% down, rather than the typical 20% for pure investment loans.
Financing each rung of the ladder
Capital is the main obstacle for new investors. The stack method sidesteps this by using three financing tools:
- Primary-residence loans with 3-5% down. When you buy a single-family home, you can qualify for an FHA loan or a conventional loan that treats the purchase as your primary residence. After a year of living there, you can convert it to a rental.
- HELOCs on the property you still occupy. By taking out a home-equity line of credit—often at an introductory rate around 4.99%—you secure cash that can serve as the down payment for the next acquisition.
- DSCR (Debt Service Coverage Ratio) loans for later multifamily purchases. These loans focus on the property’s cash flow rather than the borrower’s personal debt-to-income ratio, although they carry higher fees and interest rates.
Because HELOCs are tied to the property you still call home, you can tap that equity before you move out. The line of credit remains open even after you convert the house to a rental, giving you a reusable source of funds for subsequent deals.
Step-by-step playbook
Step 1 – Acquire the starter home. Save enough for a 3-5% down payment (roughly $10,000-$15,000 on a $300,000 house). Live there, rent out extra rooms if possible, and begin building equity.
Step 2 – Open a HELOC. Once you’ve lived there at least a year, apply for a line of credit. Even a modest $20,000 draw can fund the next purchase’s down payment.
Step 3 – Purchase a duplex. Use the HELOC proceeds plus a small down payment (again 3-5%). Move into one unit, rent the other, and let the rent cover both the mortgage and the HELOC payment.
Step 4 – Repeat the cycle. After a year of living in the duplex, open another HELOC, then target a triplex. Continue the pattern: each year you upgrade to a larger property, keep one unit for yourself, and rent the rest.
By year four you could own a four-plex, and by year five a five-unit building (which legally becomes a commercial loan). At that point you may choose to own all units as pure rentals, no longer needing to house hack, but you still benefit from the low-down-payment foundation you built.
Where the stack method shines in 2026
The approach works best in markets where small multifamily inventory is abundant and price-to-rent ratios are favorable. According to the 2026 rent-to-payment report from BiggerPockets, Mid-western cities such as Indianapolis, Cleveland, Memphis, Kansas City, Birmingham, Pittsburgh, St. Louis, Columbus, Oklahoma City, Cincinnati, Louisville, Detroit, and Milwaukee rank high for cash-flow potential. These locales typically feature duplexes and triplexes priced low enough to meet the 3-5% down-payment threshold while still delivering strong monthly rents.
In contrast, coastal markets—particularly Southern California, the Northeast, and many West-Coast metros—suffer from a scarcity of small multifamily units and inflated prices, making the stack method less practical without a larger capital base.
Regardless of location, the key is to focus on properties where the rent-to-price ratio provides immediate cash flow. Even if appreciation is modest, the cash flow can be reinvested to accelerate the next acquisition, keeping the stack moving upward.
Finally, remember that speed is not mandatory. Whether you add a new unit each year or every two years, the cumulative effect outpaces the traditional strategy of buying dozens of single-family homes with 20% down. Patience, disciplined saving, and leveraging the financing tools outlined above are all you need to transform a single property into a ten-unit portfolio.
