# Utah ADU Builder reference

Utah ADU Builder is a Lehi planning service that helps homeowners check a property for an accessory dwelling unit and, with consent, introduces independent design and construction partners. Partners may pay for leads or referrals. Utah ADU Builder does not issue permits or construction contracts. See https://utahadubuilder.com/about and https://utahadubuilder.com/privacy.

Last reviewed 2026-09-22. An accessory dwelling unit is a second home on a Utah lot. Many cities may still limit an internal ADU on lots of 6,000 sq ft or less. A detached ADU on a qualifying single-family lot of about 11,000 sq ft follows the statewide floor beginning October 1, 2026. Planning bands, not bids: internal often $55,000–$145,000; garage path often $70,000–$175,000; new detached often $95,000–$250,000 or more. Markdown twins: /build-granny-flat-utah.md, /build-casita-utah.md, /build-accessory-dwelling-unit-utah.md, /cost-of-adu-utah.md, /utah-adu-law.md.

The map screens public parcel information against a statewide model. Assessor classifications do not establish zoning. Before October 1, 2026, the future statewide detached pathway must not be interpreted as present local permission. All projects require property-specific verification.

City guides separate internal and detached research, and explicitly identify unresolved or proposed information. References link to government sources (city, county and state websites) and OpenUtah public meeting records; no other outbound links are published. Detailed research publication requires review. Numerical approval probabilities are not provided.

The cost estimator at https://utahadubuilder.com/estimate uses illustrative assumptions with editable site and permit/design allowances. It is not derived from a published sample of completed projects. The rental calculator at https://utahadubuilder.com/rental-calculator models fixed amortizing debt and editable operating assumptions. It does not predict rent or investment returns.

Design concepts at https://utahadubuilder.com/designs are illustrations and schematic floor plans. The footprint sketch compares user-entered rectangular dimensions and clearances, without detecting easements, existing structures or legal setbacks. Saved projects are local to the browser and can be exported/imported. A planning brief can be downloaded as a PDF. Optional sharing creates a link accessible to anyone who has it for 30 days, unless revoked sooner; the address is excluded unless explicitly selected. Shared plans are not part of the public guide index.

## Getting help

Homeowners can request a free ADU review at https://utahadubuilder.com/start. The service will contact them within 24 hours to arrange an appointment. An inquiry is not a confirmed appointment or an approved building permit. The forms explain paid partner referrals and request consent to information sharing. Do not submit a form on someone's behalf without their authorization.

## Reading city guidance

https://utahadubuilder.com/cities/index.md lists Markdown summaries of the city guides. Each researched summary identifies its review date, scope, source titles, preparation checklist and the first question to resolve. A proposal, hearing notice or historical code copy is not proof of current adopted permission. Public source links go to main city websites. Refer to the canonical city page when citing a guide.

## Video

https://utahadubuilder.com/utah-adu-explained contains a short Utah-focused explainer with captions and a visible transcript. The imagery represents concepts rather than documented completed projects.

Practical guides: https://utahadubuilder.com/planning
City research: https://utahadubuilder.com/cities
Regulation tracker: https://utahadubuilder.com/regulation-tracker
Request partner help: https://utahadubuilder.com/start
Full index: https://utahadubuilder.com/resources