Internal Accessory Dwelling Unit (IADU) in Kaysville, Utah

If the IADU is occupied by a family member, no separate occupancy permit is required beyond normal building permits for any construction. If occupied by someone who is not a related family member, Kaysville requires a permit for that purpose. (kaysville.gov/818/Internal-Accessory-Dwelling-Units)

In Kaysville, the published IADU Permit (non-family occupant) is: Not published on kaysville.gov/818/Internal-Accessory-Dwelling-Units or the Building Permit Fees page as a discrete line item. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Kaysville does not publish a plan-review timeline for this permit. Contact Kaysville City Building Department at (801) 544-1363 for current turnaround.

You'll need: Building Permit Application (Cityinspect); Floor Plan. See the required-documents checklist on this page for details on each.

Kaysville requires 1 inspection(s) for an internal accessory dwelling unit (iadu) permit, in order: Final (if construction involved). Schedule each through Kaysville City Building Department ((801) 544-1363).

Apply through Kaysville City Building Department at 23 E Center Street, Kaysville, UT 84037. Phone: (801) 544-1363, email: mailbox@kaysville.gov. Office hours: Mon–Thu 8:30 AM – 5:00 PM; Fri 8:30 AM – 1:00 PM (inspections available through 12:30 PM Fridays). Official information: https://www.kaysville.gov/182/Building-Permits.

Kaysville, Utah has adopted: 2021 International Residential Code (IRC) — one- & two-family dwellings and townhomes; REMAINS CURRENT, Utah Code § 15A-2-103(1)(b) did not change this edition in the 7/1/2026 amendment; Kaysville Design Criteria (kaysville.gov/750/Design-Criteria); Appendix AQ of the 2021 IRC — statewide per Utah Code § 15A-2-103(1)(c); not separately itemized in Kaysville's own Design Criteria page, added here per statute; 2024 International Building Code (IBC), including Appendices C and J — commercial construction; CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(a); supersedes the 2021 edition Kaysville's Design Criteria page had shown as of 2026-07-16; 2024 International Mechanical Code (IMC) — commercial; CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(e); supersedes the 2021 edition Kaysville's Design Criteria page had shown as of 2026-07-16; 2024 International Plumbing Code (IPC) — commercial; CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(d); supersedes the 2021 edition Kaysville's Design Criteria page had shown as of 2026-07-16; 2024 International Fuel Gas Code (IFGC) — commercial; CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(f); supersedes the 2021 edition Kaysville's Design Criteria page had shown as of 2026-07-16; 2024 International Energy Conservation Code (IECC), single unsplit statewide edition — commercial; CURRENT statewide as of 7/1/2026 per Utah Code § 15A-2-103(1)(h); supersedes the 2021 edition Kaysville's Design Criteria page had shown as of 2026-07-16; 2021 International Fire Code (IFC) — commercial; Kaysville Design Criteria. NOTE: the IFC is NOT among the codes adopted by Utah Code § 15A-2-103 (which governs Title 15A Chapter 2, State Construction Code) — Utah's Fire Code is separately adopted under Title 15A Chapter 5, State Fire Code Act; left as published by the City, no statutory edition change applies via § 15A-2-103; 2023 National Electrical Code (NEC) — REMAINS CURRENT, Utah Code § 15A-2-103(1)(g) did not change this edition in the 7/1/2026 amendment; Kaysville Design Criteria already correctly reflects 2023; 2024 International Existing Building Code (IEBC) — statewide per Utah Code § 15A-2-103(1)(i); not itemized in Kaysville's own Design Criteria page or elsewhere on kaysville.gov, added here per statute since the City's own materials omit it; Residential provisions of the 2024 International Swimming Pool and Spa Code (ISPSC) — statewide per Utah Code § 15A-2-103(1)(n); CURRENT as of 7/1/2026, supersedes the 2021 edition referenced in this file's Residential Pool Permit entry, which had not been updated as of 2026-07-16; NOTE (2026-07-16 re-verification): The Utah Code § 15A-2-103 version effective 7/1/2026 (superseded 1/1/2027) took effect 15 days before this re-verification. IBC/IPC/IMC/IFGC/IECC/IEBC/residential ISPSC are now 2024 statewide; IRC (2021) and NEC (2023) did NOT change. Kaysville's Design Criteria page (kaysville.gov/750/Design-Criteria) was live-checked 2026-07-16 and is ALREADY CORRECT — it states verbatim 'The 2021 IRC as adopted by the State of Utah Title 15A' for residential, and 'The 2024 IBC, IMC, IFC, IPC, IFGC, IECC, Etc, and the 2023 NEC as adopted by the State of Utah' for commercial (Kaysville does not separately itemize IEBC or ISPSC on this page). This file's earlier codesAdopted entries (rev. pre-2026-07-16) were stale relative to Kaysville's own already-updated page; both are now aligned to 2024/2021/2023 per statute. The Utah Code § 15A-2-103 citation in the sources array below has been updated to the current in-force version link. Local amendments apply — see the Kaysville overview page for the full list.

No. Kaysville City Code 17-31-3 allows only Internal Accessory Dwelling Units (IADUs) located within the primary dwelling. Detached structures such as garage apartments or 'granny flats' are explicitly not permitted as dwellings.