Plain English:
Project Basis Gate
This article explains the 2024 IMC model-code path. Before project use, confirm the adopted code edition, local amendments, controlling administrative provisions, permit-application date, and current AHJ procedures. The locally adopted requirements control.
Permit and duration (110.1): Confirm whether the temporary use, equipment, or system requires a permit and the locally adopted duration and extension process. Model-code provisions may use 180 days, but the jurisdiction can change or replace it.
Conformance (110.2): "Temporary" != "anything goes." Installations must meet the IMC to the extent needed for health, safety, and welfare.
Temporary utilities (110.3): AHJ may authorize temporary service utilities (see Section 109).
Termination (110.4): AHJ can terminate and order discontinuance if unsafe, noncompliant, or beyond scope/time.
On Plans: Why It Matters in Design & Construction
Temp heat/cool, negative air, construction dehumidification, temp boilers/chillers, or generators are often critical to schedule-but the AHJ can pull the plug if they're not permitted, safe, or properly vented. Plan the temporary system like you would a permanent one: combustion air and venting/clearances, electrical capacity and OCPD, fuel storage and CO/NOx control, make-up air for negative pressure, and removal/restore at the end.
Code Path: What to Show
Submit a 1-page temporary permit package: purpose, duration, equipment listing, life safety measures, power source, and decommissioning plan.
M-001 or submittal cover: Include permit duration, extension trigger criteria, and restoration notes.
Note fuel-fired temporary equipment venting path and CO monitoring on the submittal.
Check: Before You Mobilize
Confirm the permit type before installing any temporary system - 'temporary' does not mean no permit.
Verify that temporary installations meet IMC health, safety, and structural requirements.
Coordinate temporary utility authorization with the AHJ before energizing.
Review Risk:
Do not assume temporary systems are permit-exempt or subject to a universal 180-day limit. Verify the locally adopted permit and duration rules.
Don't place temporary fuel-fired equipment without confirming venting, clearances, and CO detection.
Don't skip the decommissioning plan - restoration, firestop patching, and cleaning are required.
Field Tip:
Submit a 1-page temporary plan with your permit request:
1. Purpose & duration (start/end, requested extension trigger).
2. Equipment & fuel (models, input, listing, MI pages).
3. Life safety (venting path, clearances, CO monitors, make-up air, spill/containment).
4. Power (source, feeder/OCPD, GFCI where required).
5. Controls & supervision (lockout/tagout, daily check log, shutdown criteria).
6. Decommissioning (removal, patching, firestop restoration, cleaning).
Coordinate temporary utility authorization with the AHJ before energizing.
Masterbuild QA Lens
Temporary systems are often installed without a verified permit path. Before installation, confirm authorization, document the locally controlling duration and extension trigger, verify CO monitoring and venting, and confirm combustion clearances at the actual installed location.
Drawing / Submittal Check
For temp system submittals, M-001 should include: permit duration and the extension-request trigger, equipment listing confirmation, venting path diagram, CO and NOx monitoring locations and alarm setpoints, and the decommissioning scope with responsibility assigned.
Common Review Risk
Most temp system violations come from four patterns: (1) no permit - team assumes 'temporary' is exempt; (2) duration exceeded without a filed extension; (3) CO monitoring absent or inadequate for the ventilation condition; (4) venting clearances met in the spec but not in the actual installed location. All four are avoidable in pre-installation review.
When To Escalate
Escalate when an AHJ determines that a temporary system requires full permanent permit treatment, or when life-safety conditions - CO monitoring, combustion venting, electrical capacity - cannot be met within the project's current temporary equipment spec.
Temporary Utilities Coordination
For temp systems with fuel-fired equipment, coordinate with the utility provider on gas pressure available at the temporary connection point. Confirm the meter set and OCPD ratings support the temp load before scheduling start-up. Temporary connections that require utility modifications need their own release authorization from the utility, separate from the AHJ permit.