Single-Family vs Multi-Family Rentals: Which Is Better for Investors?

In national survey data, small multi-family properties with 2 to 4 units bring in more rent per dollar of value, while single-family homes have one tenant to manage and a smaller minimum down payment for investors: 15% versus 25% under Fannie Mae's rules. Which is better for you depends mostly on whether you will live in one of the units and how much management you want. A buyer who lives in a 2- to 4-unit property can put down as little as 3.5% with FHA or 5% with a conventional loan. At five units, a building moves to commercial financing based mainly on its rental income.

How the loan rules change at five units

The conforming loan limit is the largest loan Fannie Mae and Freddie Mac can buy in most of the country. A conventional loan with less than 20% down, including a 15%-down rental loan, requires mortgage insurance. Fannie Mae's 3% option on a house requires at least one first-time homebuyer on the loan unless it is a HomeReady mortgage, a program for borrowers earning no more than 80% of the area median income, and its 5% option on 2 to 4 units applies only to loans approved through its automated underwriting system.

Cash left after closing matters too. Fannie Mae requires reserves of six months of the new payment (principal, interest, taxes, insurance, and any HOA dues) for a 2- to 4-unit home you live in and for any investment property, and sets no minimum for a one-unit home you live in. An investment purchase adds reserves of 2% to 6% of the balances on your other mortgaged properties besides your home, depending on how many you have.

FHA's 3.5% down option requires a credit score of 580 or higher and at least one borrower who moves in within 60 days of closing and plans to stay at least a year. FHA charges an upfront mortgage insurance premium of 1.75% of the loan, which can be added to the balance, plus an annual premium that lasts the life of a loan made with 3.5% down. On three or four units, FHA also requires three months of payments in reserve and a rent test: the appraiser's estimate of market rent for all units, including yours, minus 25% (or the appraiser's vacancy and maintenance estimate, if higher), must cover the full monthly payment with taxes and insurance.

At five units or more, the lender looks first at net operating income (NOI), the rent left after operating expenses, and at the debt service coverage ratio (DSCR), NOI divided by the annual loan payments. A commercial loan's term can be shorter than the payoff schedule used to set its payment, such as a 5-year loan with payments figured over 25 years, which leaves a large balance to repay or refinance when the term ends. Commercial real estate loans covers lender types and terms, and rental property financing options compares the residential choices.

Rent, expenses, and debt coverage by property size

From the 2024 Rental Housing Finance Survey by the Census Bureau and HUD:

The 2- to 4-unit value is the survey's average of $576,000 per property divided by its average of 2.8 units, and the rent range is the average lowest and highest rent per unit in those buildings. These are national averages across very different markets, so they show the direction of the difference rather than the numbers for a particular deal; screen each candidate with the 1% rule and 50% rule and then a full cash flow estimate.

The down payment narrows the gap. On the averages above, an investor's 15% down on the house is about $62,000 for $1,651 of monthly rent, plus mortgage insurance on the loan, while 25% down on one unit's share of a small multifamily building is about $51,700 for $1,326 to $1,668.

The survey also compared NOI with mortgage payments on properties that have a mortgage; a ratio under 100% means rent after expenses did not cover the payment. The median was 74% for 2- to 4-unit properties and 80% for single-unit rentals, the latter with a wide margin of error. For buildings with 5 to 24 units, whose loans are sized mainly on the building's income, the median was 125%.

Vacancy risk

Each vacancy costs a house more. A house that sits empty for two months loses 17% of its rent for the year while the mortgage, taxes, and insurance are still due. One unit of a fourplex empty for the same two months costs about 4% of the building's rent for the year, and the other three units keep paying. Run that case in your cash flow estimate and hold cash reserves for the shortfall, whichever type you buy.

Management load

Each unit adds a tenant, a lease, move-outs, and repair calls, and multi-unit buildings add shared systems and common areas. The Office of the Comptroller of the Currency (OCC), which supervises national banks, lists separate utility meters among the property features to check on apartment loans, and it puts buildings where the landlord supplies heat, water, or electricity, usually because the units lack separate meters, at the high end of the 35% to 45% of revenue that apartment operating expenses usually take. Before buying a duplex or fourplex, confirm which utilities have separate meters and who pays each bill.

For apartment buildings, the OCC calls management ability critical and names inept or inexperienced management as a major cause of trouble on these loans. Lenders typically underwrite them with a management fee of 5% of revenue, so count that cost even if you plan to manage the building yourself.

Valuation and resale

Appraisals of 1- to 4-unit properties rest mainly on recent sales of similar properties; FHA, for example, requires the sales comparison approach on every appraisal. Buildings with five or more units are valued mainly on income: NOI divided by a capitalization rate (cap rate), explained in cap rate explained. The OCC notes that rising interest rates can push cap rates up and values down with no change at the property, while raising NOI through higher rents or lower expenses raises value directly.

The loan rules also decide who can buy from you. A house or a 2- to 4-unit property can be sold to someone who will live in it and finance it with an FHA or conventional loan at 3.5% to 5% down, as well as to investors. A building with five or more units sells to buyers who pay cash or qualify for a commercial loan based on its income.

Which fits your plan

• You will live in one unit: a duplex, triplex, or fourplex lets you use owner-occupant financing while the other units' rent offsets your payment, the approach described in what is house hacking. Count the required reserves in your cash budget, and on three or four units with FHA, run the rent test before you make an offer.
• Investor with limited cash or time: a house needs 15% down (with mortgage insurance) instead of 25% and has one tenant to manage.
• Investor comparing two candidates: run both through the same cash flow estimate with your lender's rate quote, counting the down payment, any owner-paid utilities, and a vacancy allowance for each from local data.
• Moving to five or more units: the loan amount, the appraised value, and the pool of buyers you can later sell to all depend on the building's NOI, so get a commercial lender's terms before you make an offer.

For the steps from preapproval to closing on either type, see how to buy your first rental property.