Living in Your Investment
House hacking is the practice of purchasing a residential property, occupying one unit or portion of it as your primary residence, and renting out the remaining space to offset or eliminate your housing costs. At its most effective, a house hacker's rental income covers the entire mortgage payment, property taxes, and insurance — meaning they live in their own home at little or no net cost while simultaneously building equity.
The term was popularised by Brandon Turner, co-author at BiggerPockets and author of The Book on Rental Property Investing (2015), though the underlying practice — renting rooms or units to help cover housing costs — has existed as long as home ownership.
Why House Hacking Is Uniquely Powerful
House hacking exploits a specific asymmetry in how governments and lenders treat primary residence purchasing compared to investment property purchasing.
Financing advantage: Owner-occupied property can be purchased with substantially less down payment than investment property. In the UK, Help to Buy schemes and standard residential mortgages with 5-10% deposits are available to owner-occupiers; investment property typically requires 20-25% deposits. In the US, FHA loans allow owner-occupants to purchase with as little as 3.5% down — something unavailable to pure investors.
Tax efficiency: In many jurisdictions, profit from renting a room in your own home benefits from special tax treatment. In the UK, the Rent a Room Scheme allows owner-occupants to earn up to £7,500 per year tax-free from letting a furnished room. In the US, there are specific home-office and partial-use provisions that reduce the complexity of part-rental from a primary residence.
The wealth acceleration effect: instead of spending a large sum monthly on housing that disappears entirely, a house hacker converts some or all of that cost into equity accumulation. The combination of leverage (a mortgage), rental income covering costs, and property appreciation can produce substantial wealth on a modest initial investment.
Common House Hacking Structures
The most common structures depend on property type and local regulations.
Multifamily property: a duplex, triplex, or quadplex where the investor lives in one unit and rents the others. This is the classic house hack — the units are legally separate, tenants are easier to manage, and the income/cost split is clean.
Room rental: in a single-family house, one or more rooms are rented to lodgers or short-term guests (Airbnb). This is more personal — tenants share common spaces with the owner — but can generate higher income per unit of space.
ADU (Accessory Dwelling Unit): some owner-occupants add a garden apartment, basement suite, or converted garage to rent separately while occupying the main house. ADUs require planning permission in most jurisdictions but can add significant long-term value.