Do I need a permit for HVAC work in
Canton, Georgia?

You have a 3-ton Lennox air conditioner unit that's 18 years old, failing to cool efficiently. The HVAC contractor quotes a 3-ton replacement (same capacity, higher SEER rating) and says 'it's a straight swap — one day, no ductwork changes.' You call the Canton Building Department to ask if a permit is needed. The answer: yes, because the replacement unit has a different efficiency rating and requires a new nameplate, electrical re-certification, and system commissioning test. Even though the old ductwork is reused, a mechanical permit ($150) and electrical permit ($100) are both required. The contractor must pull both permits (or you pull them yourself through the online portal if you're the owner-builder). The rough-in inspection happens after the unit is installed and the outdoor pad is set on compacted stone (the inspector checks frost-heave risk given your Piedmont red clay soil type and the 12-inch frost depth — your contractor confirms the pad is level and has 1/8-inch slope away from the house). The condensate drain, which runs 40 feet to daylight on the east side of your lot, is inspected for proper trapping and slope. The electrical disconnect at the breaker panel is verified for proper wire gauge (240V, 40-amp circuit for a 3-ton unit). Final inspection passes without correction requests. Total project cost: $5,500 (equipment + labor) + $250 (permits and inspections). Timeline: permit issued Monday, rough-in Wednesday, final Friday — six business days start to finish. If you skipped the permit, and a neighbor reported the unpermitted work or an insurance claim was filed post-system-failure, Canton would issue a stop-work order (no additional work on the unit allowed), fine you $750, and require a re-pull permit at double fee ($300 total) before the system could be legally operated. Your homeowner's insurance could deny a future claim tied to that unit, and you'd face disclosure liability if you sold the house.

You're replacing a 1970s gravity furnace (no AC) with a new high-efficiency gas furnace + central AC system. The existing basement ductwork is mostly deteriorated and asbestos-wrapped; the HVAC contractor proposes running all new ductwork through your attic (adding 400 square feet of sheet-metal ductwork, sealing existing leaks with mastic, and adding rigid insulation). This is a substantial alteration and absolutely requires a mechanical permit, because the ductwork design changes the entire heating/cooling distribution. You also need a gas-piping inspection if the furnace is being moved or a new gas line is being run. The contractor submits a permit application with ductwork plans (showing duct sizing, location, R-value insulation, air sealing details) to the Canton Building Department. The city's 2015 IECC adoption means the ductwork must meet Section 403.2 (Duct Sealing), which specifies ductwork tested at 300 Pa to confirm leakage is below 15% of the system's total supply airflow. The contractor's crew pulls permits for the mechanical work ($180), gas piping ($75), and electrical (if the furnace blower wiring is new, $100). During rough-in inspection, the inspector verifies: duct sizing is correct for the furnace BTU output (your 80,000-BTU furnace serves a 2,000-square-foot home, so 5-ton cooling capacity is reasonable); all ductwork joints are sealed with mastic and fiberglass-reinforced tape; supply ducts have a minimum R-5 insulation in the attic (critical in Canton's 3A climate zone to prevent condensation on Piedmont clay-area roofs); return ductwork is properly sized and routed back to the furnace plenum; and the condensate drain for the AC coil is trapped and exits to daylight or a drain pan. The inspector also checks the furnace's gas inlet connection, the electrical breaker for the AC compressor and blower motor, and the thermostat wiring. Common failure points: ductwork insulation thickness (too thin, causing condensation in summer humidity), return-duct undersizing (limiting airflow), and condensate drain trapping (a straight-run drain pipe will freeze in winter and back up). After corrections (if any), final inspection passes once the system has been run and balanced (airflow confirmed at each supply register). Total cost: $12,000 equipment + labor, plus $355 in permits and inspections. Timeline: 10–14 business days. If you skipped permits, you'd face even heftier consequences here: the unpermitted ductwork in the attic is a major alteration, and insurance would almost certainly deny any claim related to the HVAC or attic moisture. Sale disclosure becomes a nightmare (previous unpermitted ductwork must be disclosed), and a refinance appraisal will catch this instantly.

You're installing a ductless mini-split heat pump system in a 1,200-square-foot home to replace a window AC unit and provide heating. The outdoor condenser will be mounted on a pad 6 feet from the property line (your Canton neighborhood lot is narrow, 60 feet wide). The indoor head unit is mounted on a first-floor wall, and the refrigerant lineset and condensate drain run through a small 3-inch wall cavity to the outdoor compressor. A new 240V, 30-amp dedicated circuit is needed for the compressor; the electrician runs a new conduit from the breaker panel across the garage to the exterior wall. This is definitely a permit-required project: mechanical permit (for the mini-split installation, refrigerant handling, and condensate disposal), electrical permit (for the new 30-amp circuit and breaker), and potentially a zoning/setback variance if the condenser pad is closer than your local setback requires (though 6 feet from the property line is usually OK). You hire a licensed HVAC contractor who holds a Georgia Class A mechanical license and a licensed electrician (licensed by the Georgia Secretary of State, construction industry division). Both pull their respective permits through the Canton online portal. The mechanical permit application includes a cut sheet for the mini-split unit (showing refrigerant type, charge weight, electrical specs), the location of the outdoor condenser relative to property lines and structures, and the condensate drain routing. The electrical permit includes the new circuit diagram and wire gauge (likely 10-gauge copper for a 30-amp, 240V circuit). Rough-in inspection: the inspector verifies the outdoor condenser is on a level pad (concrete or compacted stone), set back 6 feet from the property line, and at least 10 feet from any AC window opening on the neighboring property (per EPA Section 608 refrigerant-handling rules and common nuisance law). The condensate drain is checked for proper slope and termination (should exit to daylight or a sump pump, never onto the neighbor's yard). The indoor head-unit wall mounting is inspected for structural integrity. The refrigerant lineset diameter, insulation, and routing through the wall cavity are confirmed to meet the manufacturer's specs and local code. Electrical rough-in checks the new breaker, wire gauge, bonding, and GFCI protection (if applicable). Final inspection occurs after the system is charged and a nitrogen-pressure test has verified no refrigerant leaks. Many contractors charge a 'nitrogen test' fee ($200–$500) as part of their service; this is standard in the industry. Total project cost: $5,000–$7,000 (mini-split unit, installation, electrical) plus $300 in permits and inspections. Timeline: 8–12 business days. If you'd hired an unlicensed HVAC person to 'just install' the unit without permits, you'd face: (1) immediate stop-work order and $1,000+ fine; (2) insurance denial on any refrigerant-leak or electrical-fire claim; (3) heavy resale disclosure burden (unpermitted mechanical work and potentially unlicensed work); (4) refinance block — appraisers flag unlicensed installations automatically. Canton is stricter on this because mini-splits are relatively new to the area, and code enforcement wants to ensure they're done right.