House hacking is the strategy of purchasing a residential property as your primary residence and renting out a portion of it — extra bedrooms, a basement unit, an accessory dwelling unit (ADU), or additional units in a small multi-family property — to generate income that offsets or eliminates your housing costs. At its best, house hacking turns your largest monthly expense into a wealth-building asset and serves as a low-barrier entry point into real estate investing.

House Hacking Strategies

The most common approaches include:

  • Small multi-family (duplex, triplex, fourplex): Live in one unit, rent the others. This is the most powerful approach — rental income from 2–3 units can fully cover your mortgage, and you qualify for owner-occupant financing rates and down payments.
  • Room rental in a single-family home: Rent out spare bedrooms to roommates. Lower returns but simpler entry with no zoning restrictions.
  • Accessory Dwelling Unit (ADU): Rent a garage conversion, basement apartment, or backyard cottage while living in the main house. ADUs have become increasingly popular as zoning reform has expanded their permissibility.

Use the House Hacking Calculator to determine your effective net housing cost after rental income.

FHA Loans as the House Hacking Entry Point

FHA loans allow owner-occupants to purchase 1–4 unit properties with as little as 3.5% down. This means you can acquire a fourplex with a small down payment, live in one unit, and rent the other three. The rental income from those units is often enough to fully service the mortgage — or even generate positive cash flow. No other investment vehicle allows you to acquire a four-unit income property with 3.5% down using residential financing terms.

Tax Benefits of Living in Your Investment

House hacking creates a unique tax situation. The portion of the property you personally occupy is treated as a primary residence — giving you access to the capital gains exclusion ($250,000 single / $500,000 married) when you sell. The rented portion is an investment property, giving you proportional depreciation deductions, expense deductions, and the ability to deduct shared expenses (mortgage interest, property taxes, insurance, utilities) based on the rental percentage of the space. Consult a tax professional to structure these deductions correctly.

Risks and Considerations

House hacking means living in close proximity to your tenants, which removes the professional distance that makes landlording easier. Tenant selection, lease agreements, and clear house rules matter more when you share a roof. Additionally, once you move out, the owner-occupant financing terms no longer apply, and a future refinance or purchase will use investment property underwriting (higher rates, larger down payment). Analyze the rental cash flow of the property as a pure investment from day one to ensure it works even after you vacate.