The Research Library
Independent research & reference on Utah ADUs
This is the reference section of Utah ADU Builders — a deliberately plain, non-commercial home for our primary-sourced research on accessory dwelling units in Utah. Each asset cites its sources and shows when it was last verified, so writers, researchers, and public agencies can read, quote, and link to it with confidence.
No sales, no forms — just the underlying law, data, and methodology behind the topic. Everything here stays within the research section.
Browse the Utah ADU floor plans and pre-approved plans directory for the underlying plan-source review.
Research Assets
8 entries- Law · Tracker
Utah SB284 Detached ADU Tracker: 2026 Law & City Data
Utah SB284 detached-ADU law, the 11,000-sq-ft state floor, and a partial Provo, West Jordan and Lehi source snapshot with individual check dates.
Last updated
- Data · Law
Utah ADU Laws by City: 2026 Rules, Data & SB 284 Status
Utah ADU law by city: the specified-municipality test and source-dated local records; city adoption status is not continuously recertified.
Last updated
- Data · Valuation
ADU Property Value: A 65.4% National Gap in 2023, Plus Utah Data
65.4% national and 29.2% Utah median appraisal gaps in 2023—not value added by an ADU. FHFA tables, free CSV. Updated Sept 2026.
Last updated
- Data · Research
Egress Window Size Chart & Calculator
1 of 6 hung-window formulas met the 5.7 sq ft size checks at a 36×60-in unit size. Charts, primary specs and free CSVs. Updated Sep 2026.
Last updated
- Data · Research
Utah ADU floor plans and pre-approved plans directory
Salt Lake City's five named pre-approved ADU designs, a source review of 17 Utah cities, selected posted size tests, free CSV files, and a browser-only Plan Fit Check.
Last updated
- Data · Building
Utah Frost Depth by City
6–48 inches across 36 Utah city, county and district entries. Official sources, measurement notes and free CSV. Updated September 2026.
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- Data · Financing
Utah ADU Loans, Grants, and Programs: What Actually Exists
A verified tracker of every real Utah ADU funding source: SLC’s $200K Backyard Keys loan, the state pilot repealed July 1, 2026, and which loans let projected ADU rent help you qualify.
Last updated
- Data
Utah ADU Permit Data (2026): Official Source Map
Where official Utah ADU permit data lives, verified 2025 city counts from the state MIH reports, why the numbers aren’t comparable, and the complete statute crosswalk.
Last updated