Skip to main content
CityRuleLookup

Lehi, UT Accessory Structures: ADU Impact Fees (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 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?
Before construction starts. Section 26.030(G) requires the applicant to obtain all necessary building permits and pay all applicable fees, including impact fees, prior to constructing the ADU, not at final inspection or when the unit is rented.
Is Planning Division approval enough to start building a Lehi ADU?
No. Section 26.030(G) requires a separate Building Division permit in addition to Planning Division approval, and the accessory unit must conform to the City's adopted building codes before any impact fees are paid and construction begins.
Do detached ADUs pay the same impact fees as internal ones?
Yes. Section 26.040(1)(l) requires detached accessory dwelling units to meet all other requirements of Section 26.030, which carries the Building Division approval and impact-fee-before-construction rule in subsection (G) over to detached units as well.

Sources & Official References

Other rules in Lehi

All Lehi rules

Compare Lehi to another location·View the Utah accessory structures overview

Get notified when ADU Impact Fees in Lehi, UT changes

We'll email you the moment we detect a change in the code. No spam, unsubscribe anytime.

We'll never sell or share your email. One-click unsubscribe in every email.

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.