04/20/2026
Fannie Mae quietly updated their guidelines on Accessory Dwelling Units this year, and most buyers have no idea.
If your property has an ADU (guest house, garage apartment, converted space, casita), Fannie Mae now allows the rental income from that ADU to count toward your qualifying income.
Before this change, if you bought a property with an ADU and planned to rent it out, most lenders would NOT count that projected rental income for your DTI calculation. You had to qualify based entirely on your primary income.
Now, if the ADU meets certain requirements, that rental income can help you qualify for a larger loan.
Example: Buy a property with an ADU and rent it for $1,200/month. That additional income could increase your buying power by $50K to $75K.
Requirements:
legal dwelling unit with separate entrance, kitchen, and bathroom.
Rental income documented via lease agreement or market rent analysis.
In DFW, I'm seeing more new construction in McKinney, Princeton, and Anna with ADU friendly lots.
Some builders are designing floor plans with detached casitas.
This is one of those changes that rewards buyers who are paying attention.
Comment "ADU" and I'll walk you through how this works for properties you're looking at. ποΈ