Lehi, UT Accessory Structures: ADU Impact Fees (2026)
Key Facts
- Fees due
- Before construction begins, not at completion
- Fee type
- Building permit fees plus impact fees
- Approvals needed
- Planning Division and Building Division separately
- Applies to
- Internal and detached ADUs alike
Summary
Before a Lehi accessory dwelling unit can be built, the owner must clear a separate Building Division review beyond Planning Division approval, and Section 26.030(G) requires paying every applicable fee, including impact fees, before construction of the ADU begins.
G. Building Division Approval. In addition to the approval required from the Planning Division, all ADUs shall be required to obtain a building permit from the Building Division and shall conform to all applicable standards in the City's adopted building codes. The applicant shall obtain all necessary building permits and pay all applicable fees, including impact fees, prior to constructing the ADU.
Full Breakdown
030(G), Building Division Approval, requires that in addition to the approval from the Planning Division, all ADUs obtain a building permit from the Building Division and conform to all applicable standards in the City's adopted building codes, and that the applicant obtain all necessary building permits and pay all applicable fees, including impact fees, prior to constructing the ADU. The provision layers two separate city reviews onto an ADU: a Planning Division approval that checks zoning items such as owner occupancy, lot size, and the ADU Restricted Area Map, and a Building Division permit that checks the unit against the adopted building codes for life-safety and construction standards.
Impact fees are charged on top of the ordinary building permit fee because an ADU adds a dwelling unit to the lot, and the ordinance is explicit that those fees, along with every other applicable fee, must be paid before construction starts rather than at final inspection or occupancy. 030 requirements, including the Building Division approval and impact fee obligation in subsection (G).
Violations & Fines
Starting construction on an ADU before obtaining a Building Division permit and paying applicable impact fees violates Section 26.030(G). The City can issue a stop-work order, require payment of the unpaid fees before work resumes, and withhold final approval, which also blocks the ADU license needed to legally rent the unit.
Frequently Asked Questions
When are impact fees due for a Lehi ADU?
Is Planning Division approval enough to start building a Lehi ADU?
Do detached ADUs pay the same impact fees as internal ones?
Sources & Official References
Other rules in Lehi
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