Mechanical / HVAC Permit in Post Falls, Idaho

Post Falls requires a mechanical / hvac permit for: Mechanical permit required for installation or relocation of furnaces, heat pumps, air handlers, ventilation systems, gas piping, and appliance vents; Governed by the 2018 IMC and 2018 IFGC as adopted by the City of Post Falls; Processing fee of $18.00 on all permits (plus a stated $45.00 mechanical permit base fee heading) plus per-unit fees based on appliance type and capacity; Residential ducted systems require heat load calculations (ACCA Manuals J & D or approved software) submitted with the Mechanical Permit Application; Apply through the Community Development Portal. If your project isn't listed, confirm with City of Post Falls Community Development Department, Building Division at (208) 773-8708 before starting work.

The mechanical permit processing fee is $18.00, plus $22.00 for a furnace under 100 KBTU (or $15.00 if over 100 KBTU), per the City of Post Falls Fee Schedule, rev 10-1-2025.

Post Falls does not publish a plan-review timeline for this permit. Contact City of Post Falls Community Development Department, Building Division at (208) 773-8708 for current turnaround.

You'll need: Mechanical Permit Application; Residential HVAC Review Form. Depending on your project, Post Falls may also ask for: Residential HVAC Air-Balancing Form. See the required-documents checklist on this page for details on each.

Post Falls requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough-In, Final. Schedule each through City of Post Falls Community Development Department, Building Division ((208) 773-8708).

Apply through City of Post Falls Community Development Department, Building Division at 1st Floor of City Hall, 408 N Spokane St, Post Falls, ID 83854. Phone: (208) 773-8708, email: permits@postfalls.gov. Office hours: 8:00 a.m. to 5:00 p.m., Monday through Friday. Dedicated Building Inspections line: (208) 457-3334 — leave permit number, job address, inspection type, and desired inspection date; requests left after midnight the night before cannot be scheduled for the following day.. Official information: https://www.postfalls.gov/175/Building.

Post Falls, Idaho has adopted: Idaho has a mandatory statewide building code administered by the Idaho Division of Building Safety (DBS, now organizationally under the Division of Occupational and Professional Licenses / DOPL) under the Idaho Building Code Act, Idaho Code Title 39, Chapter 41, negotiated and adopted through the Idaho Building Code Board. Local jurisdictions that adopt and locally administer the code must enforce it at least as strictly as the state minimum; Post Falls administers its own Building Division for building, electrical, plumbing, and mechanical permitting within city limits. Source: City of Post Falls Current Adopted Codes and Design Criteria (Community Development Department, rev 02/16/25), https://www.postfalls.gov/DocumentCenter/View/750/Current-Codes-and-Design-Criteria-PDF; 2018 IBC (International Building Code), as adopted by the State of Idaho Building Code Board and locally administered by the City of Post Falls. Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2018 IRC (International Residential Code), as adopted by the State of Idaho Building Code Board and locally administered by the City of Post Falls. Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2018 IEBC (International Existing Building Code). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2018 IECC with 2012 Amendments for Residential (International Energy Conservation Code). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2018 IMC (International Mechanical Code). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2017 ISPC (Idaho State Plumbing Code) — Idaho's own state-amended plumbing code, not the Uniform or International Plumbing Code. Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2018 IFGC (International Fuel Gas Code). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2023 NEC (National Electrical Code). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); ICC A117.1-2009 (Accessibility). Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); 2009 IPMC (International Property Maintenance Code), with amendments. Source: City of Post Falls Current Adopted Codes and Design Criteria (rev 02/16/25); The City of Post Falls Building Division directly issues and inspects electrical and plumbing permits within city limits (the Division's own permit-fee schedule lists dedicated Electrical Permits and Plumbing Permits fee tables administered by the City); this reflects local administration rather than direct-state DOPL/Division of Building Safety issuance for in-city work. Source: City of Post Falls Fee Schedule (Community Development Department, rev 10-1-2025), https://www.postfalls.gov/DocumentCenter/View/815/Fee-Schedule-PDF. Local amendments apply — see the Post Falls overview page for the full list.