Why it matters to you
Unpermitted HVAC work tends to surface at the worst moments — a home inspection during a sale, an insurance claim after a storm, or a warranty dispute. In the Charleston area, the permit and its final inspection are your third-party proof that the installation was done to code.
Practical guidance
Ask every bidder who pulls the permit and in which jurisdiction; the answer should be the licensed contractor, under their own license. Be wary of anyone who suggests you pull an owner permit for their work or skip permitting to save money.
Does replacing my AC with the same size unit need a permit?
In most Charleston-area jurisdictions, a full equipment replacement requires a mechanical permit even when the new unit matches the old one's size. Routine repairs such as a capacitor, a motor, or a maintenance visit typically do not. Each jurisdiction draws the line for itself, so the building department is the final word.
Who is supposed to pull the permit — me or the contractor?
The licensed mechanical contractor performing the work should pull the permit under their license; that is part of what the license is for. A bidder who asks you to pull an owner permit for their work is telling you something important about the bid. You can verify any contractor's license on South Carolina LLR's public lookup.
What does the inspector check after an HVAC installation?
Broadly: equipment installation and clearances, the electrical connection and disconnect, condensate handling, gas connections and venting where applicable, and that the work matches what was permitted. Every item exists to prevent a fire, water damage, or a carbon monoxide problem.
Why does the permit cost differ from one quote to the next?
Each building department sets its own fee schedule, so identical projects on either side of a jurisdiction line can carry slightly different permit line items. A quote with no permit line at all deserves a direct question. Ask the contractor which jurisdiction covers your address and confirm the permit appears in the paperwork.
What happens if past HVAC work in my house was never permitted?
It most often surfaces at sale time, when a buyer's inspector or the jurisdiction's records flag it. Jurisdictions have processes for permitting work after the fact, but that route is generally slower and costlier than permitting it up front. A licensed contractor can assess what exists and what correcting it involves.
