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Mechanical / HVAC Permit in St. George, Utah

Required for heating, ventilation, and air conditioning installations, replacements, and ductwork modifications in St. George. Governed by the 2024 International Mechanical Code (IMC) as adopted by Utah Code § 15A-2-103(1)(e), current as of 7/1/2026 (the 2021 IMC governed through 6/30/2026).

Verified 2026-07-23 · Source

When you need this permit

  • Furnace or boiler installation or replacement
  • Air conditioning system installation or replacement
  • Ductwork installation or major modification
  • Evaporative cooler installation
  • Fireplace or gas appliance installation (may also require a gas line permit)

Required documents

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Fee schedule

Mechanical PermitAssessed on project valuation per St. George's published 1997 UBC building permit fee schedule (sgcityutah.gov Building Fee Sheet PDF, re-fetched and confirmed live 2026-07-01) — no separate per-appliance flat-fee schedule is published by the city; the valuation table itself is the grounded fee. Minimum permit $60.60; plan check 65%; D.O.C. surcharge 1%.
Valuation-based per the 1997 Uniform Building Code fee scale (same tiers as residential building permit above)
Minimum PermitSt. George Building Fee Sheet
$60.60
Reinspection FeeSt. George City Impact Fees document (effective 4/21/21)
$47.00 per hour (minimum one-half hour)

Review timeline

Plan reviewTypical estimate — confirm current times with the St. George building department
~3–7 business days

How long did your Mechanical / HVAC Permit permit actually take in St. George?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Rough-In

    Ductwork and gas piping installed, before walls closed — verify clearances and support; IRC Equipment and Duct Plan must be on-site

  2. 2

    Final

    Equipment operational, Manual J/S/D verified, gas pressure tested, thermostat functional, combustion air supply verified; carbon monoxide detector required on every habitable level per St. George's inspection requirements

See the full St. George inspection guide — scheduling & re-inspection fees →

Tips

  • Like-for-like furnace and AC replacements in St. George still require a mechanical permit at a minimum fee of $60.60.
  • Manual J (loads), Manual S (equipment sizing), and Manual D (duct sizing) calculations are required per IRC § M1401.3 and M1601.1 as enforced in St. George — the city provides an IRC Equipment and Duct Plan form.
  • Carbon monoxide detection — one detector per habitable level — is required per the St. George Residential Final Inspection Checklist.
  • St. George follows the 2024 IMC, current as of July 1, 2026 (the 2021 IMC governed through June 30, 2026).

Frequently asked questions

Yes. St. George enforces IRC § M1401.3, requiring ACCA Manual J load calculations for all new heating and cooling equipment. The city provides an IRC Equipment and Duct Plan form that must be completed and signed by the installer.

In St. George, the published Mechanical Permit is: Valuation-based per the 1997 Uniform Building Code fee scale (same tiers as residential building permit above). Additional published fees: Minimum Permit — $60.60; Reinspection Fee — $47.00 per hour (minimum one-half hour). These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a mechanical / hvac permit in St. George typically runs 3–7 business days. This is an estimate, not a published figure — confirm current review times with St. George Building Department at (435) 627-4100.

You'll need: Permit Application (CityInspect); IRC Equipment and Duct Plan. Depending on your project, St. George may also ask for: Equipment Specifications; Contractor License. See the required-documents checklist on this page for details on each.

St. George requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough-In, Final. Schedule each through St. George Building Department ((435) 627-4100).

Apply through St. George Building Department at 61 S Main St, St. George, UT 84770. Phone: (435) 627-4100, email: building@sgcity.org. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://sgcityutah.gov/departments/community_development/building_department.php.

St. George, Utah has adopted: 2024 International Building Code (IBC), including Appendices C and J — Utah Code § 15A-2-103(1)(a); CURRENT as of 7/1/2026 (statute version headed 'Effective 7/1/2026 (Superseded 1/1/2027)', confirmed by direct fetch 2026-07-16). Supersedes the 2021 IBC, which governed through 6/30/2026.; 2021 International Residential Code (IRC) — Utah Code § 15A-2-103(1)(b); UNCHANGED by the 7/1/2026 code cycle — remains 2021 and continues in force (confirmed by direct statute fetch 2026-07-16).; Appendix AQ of the 2021 International Residential Code — Utah Code § 15A-2-103(1)(c) (confirmed by direct statute fetch 2026-07-16).; 2024 International Plumbing Code (IPC) — Utah Code § 15A-2-103(1)(d); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). Supersedes the 2021 IPC, which governed through 6/30/2026.; 2024 International Mechanical Code (IMC) — Utah Code § 15A-2-103(1)(e); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). Supersedes the 2021 IMC, which governed through 6/30/2026.; 2024 International Fuel Gas Code (IFGC) — Utah Code § 15A-2-103(1)(f); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). Supersedes the 2021 IFGC, which governed through 6/30/2026.; 2023 National Electrical Code (NEC) — Utah Code § 15A-2-103(1)(g); UNCHANGED by the 7/1/2026 code cycle — remains 2023 (confirmed by direct statute fetch 2026-07-16).; 2024 International Energy Conservation Code (IECC) — Utah Code § 15A-2-103(1)(h); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). ONE statewide edition — the statute does not split residential vs. commercial IECC editions. Supersedes the 2021 IECC, which governed through 6/30/2026.; 2024 International Existing Building Code (IEBC) — Utah Code § 15A-2-103(1)(i); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). Supersedes the 2021 IEBC, which governed through 6/30/2026.; Residential provisions of the 2024 International Swimming Pool and Spa Code (ISPSC) — Utah Code § 15A-2-103(1)(n); CURRENT as of 7/1/2026 (confirmed by direct statute fetch 2026-07-16). Supersedes the 2021 ISPSC, which governed through 6/30/2026.; NOTE (2026-07-16 corpus-staleness fix): This file previously stated the 2021 editions as current and only forecasted the 7/1/2026 flip; the effective date has now passed and the entries above have been corrected to state the 2024 editions (per §15A-2-103(1)(a)/(d)/(e)/(f)/(h)/(i)/(n)) as current, with the superseded 2021 editions preserved as historical context. IRC (2021) and NEC (2023) were NOT changed — verified unchanged directly against the live statute. The International Fire Code (IFC) is NOT adopted anywhere in Utah Code § 15A-2-103 — the statute has no IFC subsection; St. George's own building department page does not independently cite an IFC edition, so no IFC entry appears in this list.. Local amendments apply — see the St. George overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-23.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the St. George building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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Mechanical / HVAC Permit in other cities

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