Who can buy my house with an ADU or duplex: an investor or a live-in buyer?
The buyer who will live there, with far less cash, at 2026 interest rates. An investor's loan is sized by the rent, and whatever the rent cannot carry the investor pays in cash. A buyer who will live there borrows on their own income, with most of the other unit's rent counted on top.
WHAT MOST PEOPLE ARE NEVER TOLD
In Austin's Travis County in 2026, the median two-to-four unit property sold for about $450,000. By Series Homes' estimate, its rent after costs did not cover an investor's loan payments at that price, so an investor needed more cash to buy it.
An investor's loan is sized by the rent. The rent has to cover the loan payment, the taxes and the insurance. When borrowing costs more, the loan shrinks and the investor needs more cash to pay the same price.
A buyer who will live in one unit is limited by what a lender will lend against their income. On a Fannie Mae loan, the lender can count 75 percent of the other unit's rent on top of that income, with conditions. On a house with an ADU the live-in buyer's loan treats it as one house.
Both buyers are in the market. In Travis County's 2026 deed records, just over half the buyers were companies or investor trusts. A buyer who will live there needs far less cash to pay the same price, so many more people can bid. That is the buyer to market to.
GOOD TO KNOW
The cash an investor needs falls when rates fall, so run the numbers at today's rates. On a fourplex, expect more investors. In 2025 mortgage data they took out nearly three times as many fourplex purchase loans as buyers who would live there.
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WHERE THIS COMES FROM
- Series Homes analysis of Austin MLS listings and Travis County deed records, 2026
- Fannie Mae Selling Guide B3-3.8-02, Rental Income from the Subject Property (09/02/2026)
- Fannie Mae Selling Guide B3-3.8-01, General Rental Income Information (09/02/2026)
- Series Homes count of 2025 HMDA data: home purchase loans made on four-unit properties, to borrowers who will live there and to investors (FFIEC HMDA Data Browser)
- Fannie Mae Selling Guide B2-3-04, Special Property Eligibility Considerations: Accessory Dwelling Units (November 4, 2026)
Researched and written by Series Homes. Checked against its sources on . Lending rules change. This page is general information, not a loan offer or legal or tax advice.