The permit, the circuit, and the one cost we refuse to guess at

Permit fees are set locally, published in different formats, revised on their own schedules, and structured differently from place to place. We know of no national dataset. Rather than print a made-up national average, this site reads real fee schedules one at a time and publishes only what it has actually read. Today that is one city.

That first row is worth dwelling on because of how specific it is. The schedule does not merely have a generic mechanical line; it has a row that literally reads “Air Handler, Mini-Split, Humidifier” with a First Unit fee and a lower Each Add’l Unit fee, and marks the item as qualifying for the city’s Simple Permit path for single-family homes, which the bulletin says needs no plan review. That structure tells you something the dollar figure alone does not: in that city a multi-zone job is charged per indoor unit, so a five-head system costs materially more to permit than a single-zone one. Your city may charge a flat fee, or by job value, and the shape of the fee matters as much as its size.

For orientation only, a national cost guide puts a mini-split permit somewhere between $250 and $400^[3] (Forbes Home; historical cost estimate, archived source dated August 8, 2025). That range sits above San Diego’s single-unit fee ($176.57) and around its three-zone total ($281.35), so treat it as a rough allowance only; this site never adds it silently to a total.

HomeGuide’s circuit guide lists HVAC systems among the appliances that need a dedicated 20- or 30-amp circuit; confirm with the installer and the unit’s installation manual. If your panel has open slots and the run is short, this is usually a smaller electrical job; if it does not, an electrician may need to join the job. HomeGuide’s range (historical cost estimate, archived source dated November 24, 2025): $250 to $900, with a stated national average of $650^[7]. That midpoint is the source’s own average rather than our arithmetic, which is why it carries a sourced label instead of a derived one.

Two things can push it toward the top of that range, and both are visible before anyone quotes. The first is distance: the further the outdoor unit sits from the panel, the more cable and the more fishing through finished walls. The second is what the walls are made of — running new cable through a finished, insulated, plaster-over-lath wall is a different job from running it through an open basement ceiling, and that difference is mostly labour.

If the panel is full, someone has to make room, and that is where our two sources fall apart. HomeGuide (archived source dated November 24, 2025) puts a 200-amp main panel upgrade at $1,300 to $2,500 ^[8]. Forbes Home (archived source dated August 8, 2025), in a guide specifically about mini-split installation, puts replacing an electrical panel at $400 to $800^[10]. Those bands do not overlap at all: the top of one ($800) sits $500 below the bottom of the other ($1,300).

We do not know which is right and we are not going to pretend the average of them is a number. It is entirely possible the two are describing different jobs — swapping a panel in place against a full service upgrade with a new meter base and a utility disconnect are wildly different pieces of work that get called the same thing in casual writing. That ambiguity is itself the finding, and the honest output is both figures, the disagreement stated, and no entry in any total on this site.

There is a cheaper middle path worth asking your electrician about: a subpanel, published at $500 to $1,700^[12], which HomeGuide says may be needed if the main panel is full. If the service has capacity and the main panel has simply run out of slots, ask whether a subpanel would do before accepting a service-upgrade quote.

Unresolved source conflict. This site does not pick a winner and does not put a panel upgrade in any total. The installed-cost worksheet lists a panel upgrade as an explicit exclusion for exactly this reason: a total that silently absorbs a number this uncertain is worse than a total that tells you what it left out.