Residential vs. commercial

Real estate splits into two markets, each with its own buyers, prices, loans and rules. Once you know which one a property belongs to, you know how it’s valued and how you can pay for it.

What you’ll learn

Where the line between residential and commercial falls.
Why a house is priced by comparable sales and an income property by its income.
How loans and leases differ between the two.
Why some protections follow how a property is used, not what it is.

Where the line is

For home loans, a building with one to four homes in it is residential. That covers a house, a condo, a duplex, a triplex or a fourplex. Federal housing rules call all of these single-family housing, and Fannie Mae buys loans on them as residential property.

A building with five or more homes is multifamily. It’s bought, valued and financed like a business, with commercial-style loans. Offices, stores, warehouses, hotels and self-storage are commercial too.

At a glance

	Residential (1–4 homes)	Commercial (5+ homes, stores, offices, industrial)
Value set mainly by	Recent sales of similar homes nearby	The income it produces (net operating income and cap rate)
Loans	Home mortgages, including low-down-payment loans if you live there	Commercial loans, often shorter with a large final (balloon) payment
Leases	Usually a year or less, with strong tenant protections	Often years long. The tenant may pay taxes, insurance and upkeep
Main risk	Repairs, a bad tenant, a slow sale	Vacancies and leases that don’t renew

The table shows the usual starting point, not a fixed rule. A commercial appraisal can also weigh recent sales and the cost to rebuild, and a rented house or small multi-unit can be checked against its rent. This is a first screen. A professional appraisal provides an opinion of value, not a guaranteed sale price. The most you’ll pay is your own decision, set by your numbers, not by the appraisal.

How each is valued

Homes that people live in are usually valued by comparing recent sales of similar homes. That works because there are plenty of them to compare. Federal bank examiners call it the usual approach for owner-occupied homes.

Commercial property often doesn’t have enough similar sales to compare, so it’s valued by its income instead. Start with net operating income (NOI). That’s the rent it collects in a normal year, minus operating costs like taxes, insurance, repairs and management. NOI comes before any loan payment. Then divide by a capitalization (cap) rate, which is the return buyers in that market expect.

Example: a building earns $120,000 of NOI a year. If buyers expect a 6% cap rate, it’s worth about $120,000 ÷ 0.06 = $2,000,000.
Raise the NOI by $10,000 and, at the same cap rate, the value goes up about $167,000. That’s why commercial investors focus on raising rent and cutting costs.

How loans differ

Home loans on one to four units mostly follow Fannie Mae, Freddie Mac or FHA rules. If you’ll live there, FHA can lend about 96.5% of the price. Three- and four-unit homes have extra rent and savings tests (see the financing lesson).

Commercial loans are sized on the property’s income. Lenders check that the NOI covers the loan payments with room to spare (the debt service coverage ratio, or DSCR), and they also look at the loan-to-value ratio (LTV) and who guarantees the loan.

How leases differ

Residential tenants have strong protections, and each state sets its own landlord-tenant law. Read yours before you rent out a home.

In California, most rentals fall under the Tenant Protection Act. It says rent can’t go up more than 10%, or 5% plus inflation, whichever is lower, in 12 months. It also limits when a landlord can end a tenancy.

Commercial leases are worked out between businesses, and they often run much longer. In a triple-net (NNN) lease, the tenant pays rent plus the property’s taxes, insurance and maintenance. These leases commonly run 10 or 15 years.

Protections follow the use, not just the building

Federal truth-in-lending rules protect consumers, not businesses. A loan to buy a rental you won’t live in counts as a business loan, even if it’s a single house. So some consumer protections don’t apply. If you’ll live in the property, a loan to buy one or two units is usually a consumer loan; a loan to buy three or more units counts as business. Ask the lender which rules apply to your loan, and get every cost and term in writing either way.

Where the risk is

A rental home depends on one household at a time, on short leases, so problems show up fast. Many are small, but a long vacancy, a major repair (roof, foundation, plumbing), an eviction or an uninsured loss can be expensive, and with one property all of that risk sits in one building. A commercial building can depend on a few large tenants with long leases. Income is steady while they stay, but a single vacancy or a lease that doesn’t renew can cut income sharply. Bank examiners watch vacancy rates and lease renewals for that reason. Office buildings lost income when many businesses moved to hybrid work.

Put it into practice

Pick one house and one small commercial building listed near you. Write down how each would be valued: by comparable sales, or by its income and a cap rate.

Key terms

Net operating income (NOI): A year’s rent and other income, minus operating costs, before loan payments.
Cap rate: NOI divided by price. The return buyers expect from a property before financing.
Loan-to-value (LTV): The loan amount as a share of the property’s value.
Debt service coverage ratio (DSCR): NOI divided by the year’s loan payments. 1.30x means the income covers the payments 1.3 times.
Balloon payment: A large final payment of the loan’s remaining balance, due before it would otherwise be paid off.
Triple-net (NNN) lease: A commercial lease where the tenant also pays the property’s taxes, insurance and maintenance.

Sources

Last reviewed 2026-09-29.