Do I need a permit for HVAC work in
Conway, South Carolina?

Conway HVAC permits—the key details

South Carolina Building Code Section 603.1 requires a mechanical permit for any HVAC installation, replacement, or modification that affects the building's envelope, ductwork, or refrigerant lines. In Conway, this means a permit is needed for: new air-conditioning systems, heat pumps, furnaces, mini-split ductless units, any ductwork relocation or addition, condensate-line routing, and refrigerant-line penetrations through walls, attics, or crawlspaces. The one genuine exception is a service-only repair—a technician replacing a compressor or valve on existing equipment in an existing location without touching ducts, penetrations, or the conditioned space. Even that gray area is tightening: Conway's Building Department now requires technicians to pull a permit if the repair involves evacuation and recharge of more than 2 pounds of refrigerant or any change to the charge level that affects efficiency. The city's interpretation is stricter than some inland South Carolina municipalities, partly because coastal humidity makes refrigerant-line sealing and condensate management critical to prevent mold growth in tight-envelope homes.

Load calculations and pre-submission documentation are non-negotiable in Conway for any unit exceeding 25,000 BTU. The city adopted ASHRAE 62.2 ventilation and cooling-load guidelines early, and staff will reject a permit application if the contractor or homeowner hasn't submitted a Manual J (cooling load) or Manual S (equipment selection) report. This is unusual in South Carolina—many smaller inland cities accept verbal loads or rule-of-thumb sizing. In Conway, you must hire a licensed HVAC contractor to perform the load calculation or pay an engineer $300–$500 to do it independently. The contractor's load-calc report (typically 5–10 pages, generated by software like Wrightsoft or Manual-J Pro) must be attached to the permit application. Online submission is available through the city's permitting portal, but many applicants still print and hand-carry documents to City Hall (2 Academy Street, Conway, SC) during business hours (Monday–Friday, 8 AM–5 PM, though hours should be confirmed with the department at the phone number listed on the city website) to speed turnaround. Expect the application to include the contractor's license number, a one-line diagram of the system, location of outdoor and indoor units, refrigerant type, and seasonal energy-efficiency ratio (SEER) rating.

Inspection is a two-phase process in Conway, with a rough-in and final inspection mandatory. Rough-in (conducted before ductwork is sealed, walls are closed, and conduit is buried) verifies refrigerant-line sizing, condensate-drain slope (minimum 1/8-inch drop per 12 feet per IRC M1411.2), support-strap spacing (every 3 feet, per IBC), and that all penetrations are sealed with caulk or foam suitable for salt-spray environments. Many coastal inspectors in South Carolina now require UV-resistant, marine-grade sealants for exterior penetrations—standard latex caulk fails within 2–3 years in salt air. Final inspection checks that all work matches the approved permit, the ductwork is accessible and labeled, electrical connections are correct, and the system operates without leaks. Scheduling an inspection is done online through the portal or by calling the Building Department; inspections are typically scheduled 1–2 business days after a request and are conducted during morning hours (7 AM–12 PM). If the rough-in fails (common issues: inadequate strap spacing, improper condensate routing, missing fire-dampers in ductwork penetrating fire-rated walls), the contractor must remediate and request a re-inspection, which adds 3–7 days and incurs no additional fee—the first two re-inspections are usually free, but a third triggers a $50–$100 charge.

Permit costs in Conway range from $150 to $600, depending on project valuation and complexity. A simple like-for-like replacement of a 3-ton air-conditioner (equipment cost ~$4,000–$6,000 installed) carries a permit fee of roughly $150–$200 (base fee ~$75 plus 1.5–2% of valuation). A new installation (say, converting from electric resistance heat to a 4-ton heat pump, ~$8,000–$12,000 installed) runs $250–$400 in permits alone. A whole-house ductwork redesign or addition (common in older Conway homes with outdated or leaking ducts) can push the permit valuation to $15,000–$25,000, triggering a $300–$600 permit fee. The city's fee schedule is posted on the Building Department webpage; always confirm current rates before bidding a project, as they are updated annually and differ from Horry County unincorporated-area rates (which are often lower, creating an incentive to apply outside city limits—a common workaround that violates subdivision deed restrictions). Contractors are allowed to pass permit costs to the homeowner, and most include it in the final invoice. Owner-builders (defined in SC Code § 40-11-360 as individuals doing work on owner-occupied residential property) are permitted to pull the permit themselves and hire a contractor to perform the work, which can save a few hours of contractor overhead but does not reduce the permit fee itself.

Timeline from permit application to system turn-on typically spans 10–20 business days in Conway. Submission and initial review take 5–10 days (longer if the application is incomplete). Rough-in inspection scheduling and execution add 2–3 days. Any rework due to inspection findings adds 3–7 days. Final inspection and sign-off take 1–2 days. Expedited review is not available for HVAC permits in Conway—unlike some larger South Carolina cities, there is no 'over-the-counter' same-day approval track. Plan accordingly if you have a closing date or seasonal demand (heat-pump installations surge in March–April and September–October, causing delays). Weather can impact outdoor-unit installation; winter work in Conway is unusual but possible (temperatures rarely drop below freezing). Contractor availability is often the limiting factor—pulling a permit early, even before signing a contract, demonstrates seriousness and sometimes moves you up the installer's queue.

Three Conway hvac scenarios

Coastal humidity and condensate management: why Conway is stricter than inland South Carolina

Load calculations (Manual J per ASHRAE 62.2 and Manual S) are mandatory in Conway for any unit over 25,000 BTU, a requirement that distinguishes the city from many neighboring jurisdictions in Horry County. The reason: oversized air-conditioners cool a home too quickly, cycling on and off without removing humidity—exactly the wrong behavior in a high-humidity coastal climate where the goal is steady-state cooling and dehumidification. An undersized unit runs continuously and fails to reach setpoint, also poor. Conway's adoption of ASHRAE 62.2 ventilation standards means the load calculation must account not just for sensible cooling (BTU/h to drop temperature) but also latent load (BTU/h to remove moisture). A contractor bidding a job in Conway must include the load-calc cost upfront (typically $200–$500 if done by the contractor, or $300–$600 if a third-party engineer is hired). The homeowner can sometimes push back on this cost, especially on replacements, but the city's permit staff will reject the application if the report is missing. Software like Wrightsoft Elite, LoadCalc, or Coolcalc is standard; older rule-of-thumb methods (e.g., '1 ton per 500 square feet') are no longer acceptable. The load-calc report becomes part of the permanent permit file and is useful for the homeowner: it documents equipment size, efficiency, and capacity for insurance and resale purposes.

South Carolina HVAC licensing, contractor qualification, and DIY limits in Conway

Conway's permit application process has been moving toward online submission through the city's permitting portal, but as of early 2024, many HVAC contractors and homeowners still submit paper copies in person at City Hall (2 Academy Street, Conway, SC, during business hours Monday–Friday, 8 AM–5 PM). The portal is user-friendly and includes document-upload capability for load calculations, one-line diagrams, and contractor certifications. Online submission typically results in faster initial review (5–7 business days) compared to walk-in submissions (7–10 days). Once submitted, the application enters a queue; the city's Building Department staff review for completeness (all required fields, all required attachments, all required contractor credentials) and then route to a plan reviewer if the project is complex (full ductwork redesign, structural penetrations, historic district) or approve it immediately if it's straightforward (replacement only). Applicants can check status online and receive email notifications when the permit is issued or when additional information is requested (RFI). Inspection scheduling is done online or by phone; most inspectors are available Monday–Friday, 7 AM–12 PM. The rough-in inspection is the gatekeeper; if it fails, all subsequent work stops until the contractor remediates and requests a re-inspection. Plan for at least one re-inspection if the project involves ductwork or penetrations; two or more are common in older homes or complex layouts. The final inspection is quick (15–30 minutes) if the rough-in was approved; the inspector confirms all work matches the permit, runs the system briefly to check operation, and issues a final sign-off. Once the final inspection is signed off, the homeowner can request the city to release the permit funds (in some cases, the city holds a portion of permit fees until final approval). This entire process—from application to final sign-off—typically spans 10–20 business days, assuming the contractor is responsive to any RFIs and schedules inspections promptly.

Common questions