The mortgage industry is witnessing a fundamental change in how homeowners view their property. Whether it’s to accommodate multi-generational living or to create a reliable stream of rental income, Accessory Dwelling Units (ADUs) have moved from a niche feature to a mainstream demand.
In December 2025, Fannie Mae signaled its support for this evolution by announcing expanded eligibility allowances for properties with ADUs. Effective March 31, 2026, these updates represent a massive opportunity for lenders to grow volume in a tight market, but there is a technical catch.
To leverage these new allowances, lenders must move beyond legacy appraisal forms. The expanded benefits are available exclusively for loans with UAD 3.6 appraisals.
Key takeaways:
- Fannie Mae’s expanded eligibility transforms ADUs from a property feature into a powerful qualifying tool.
- The requirement for UAD 3.6 marks a line in the sand where technology readiness becomes a direct driver of loan volume and market share.
- Embracing the UAD 3.6 transition now ensures your operations are not just compliant, but optimized to handle the modern, data-driven era of residential valuation.
What are the new Fannie Mae ADU policies?
Fannie Mae has intentionally linked these new eligibility rules to the adoption of the redesigned Uniform Appraisal Dataset (UAD). By moving to the UAD 3.6 format ahead of the mandatory November 2, 2026 deadline, lenders can immediately access broader qualifying rules for ADUs.
An ADU is a secondary living space on the same lot as a primary residence, such as a backyard cottage, a basement apartment, or an over-garage suite. To qualify under these new rules, the unit must be a complete, independent living facility with its own private entrance, a bathroom, and a dedicated kitchen area. By using UAD 3.6, lenders can now tap into:
- Increased qualifying power: Use rental income from a qualifying ADU to help borrowers qualify (up to 30 percent of total qualifying income) on one-unit principal residences.
- Multi-ADU support: One-unit properties can now include up to three ADUs, a significant increase from previous limits.
- Multi-unit expansion: Two-unit and three-unit properties are now eligible to include ADUs, provided the total unit count does not exceed four.
- Manufactured housing gains: Standard single-unit manufactured homes can now include an ADU.
Why does ADU eligibility require UAD 3.6 appraisals?
Legacy UAD 2.6 forms are too rigid for the modern property landscape. They rely on static comment boxes that often lead to underwriting friction and manual revisions when dealing with complex ADU configurations. UAD 3.6 solves this through a data-first approach:
- Dynamic, repeatable sections: Instead of trying to fit multiple ADUs into a single note, UAD 3.6 uses repeatable data blocks. Each structure is detailed with its own characteristics, ensuring a granular and accurate valuation.
- Integrated market rent: The Single-Family Comparable Rent Schedule (Form 1007) is no longer used for UAD 3.6. Instead, market rent is developed and reported directly within the Rental Information section and Rental Comparison Grid of the report.
- Underwriting certainty: Structured data reduces subjectivity. When an appraiser delivers a 3.6 report, the data is instantly digestible for automated underwriting systems, leading to faster approvals and fewer investor kickbacks.
How does Clear Capital support UAD 3.6 appraisals and ADU volume?
With the March 31 effective date, there is a scramble in the market. Many lenders are discovering that their current AMCs are not yet equipped to support UAD 3.6, creating a significant competitive risk.
At Clear Capital, our systems are up-to-date to support the delivery and review of UAD 3.6 appraisals. We are already actively performing UAD 3.6 compliant appraisals, ensuring your orders meet the latest industry standards from the start. UAD 3.6 replaces free-form text with discrete data, allowing AURA®, our AI-driven collateral analyzer, to perform a more granular review. AURA automatically validates complex ADU characteristics against property imagery, flagging discrepancies in seconds so your team can focus on high-level decision-making.
While the move to UAD 3.6 is a significant shift, it is more than just a compliance requirement. This transition represents a powerful opportunity to modernize workflows and improve collateral risk management. Successfully navigating this change requires the right mix of technology and strategic partnership. We are here to support you every step of the way as the industry moves toward this new era of appraisal reporting.