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Does this job need a permit, and what comes with it?
Pick the work. You get what is typically required in California, what testing usually goes with it, and the questions worth putting to your own building department — because they are the ones who decide.
The work
What this usually involves
A full changeout is an alteration to the building, and in California jurisdictions it is normally permitted. Under the state energy standards, alterations of this kind commonly trigger independent verification by a certified HERS rater — most often duct leakage, and frequently refrigerant charge or airflow as well.
- The contractor usually pulls the permit. Ask who is doing it before work starts, and ask to see it.
- A HERS rater is independent of the contractor by design. That is the point of the system, not an inconvenience.
- Expect a final inspection. Until it is signed off, the job is not finished however good the equipment is.
- You should end up holding the permit final and the HERS certificate. Both matter when you sell.
Ask your building department: is a permit required for a like-for-like changeout, which HERS measures apply to this job under the current standards, and who schedules the rater?
Changing only the outdoor unit feels like a smaller job, and to the building department it is generally still an alteration. Where the refrigerant circuit is opened, charge verification commonly applies, and some jurisdictions treat it much the same as a full changeout.
- Matching matters. An outdoor unit paired with an indoor coil it was not designed for performs worse than either figure on the label.
- Ask whether the existing coil and metering device are being changed. That changes both the outcome and the paperwork.
- Get it in writing that a permit is or is not being pulled, and why.
Ask your building department: does a condenser-only replacement need a permit here, and does it trigger refrigerant charge verification?
Replacing or substantially altering duct work is the alteration most closely tied to the state energy standards, and duct leakage testing by a HERS rater is commonly required. It is also, by a wide margin, the work that most improves how a house actually feels.
- Ask for the before and after leakage figures. On duct work that number is the whole story.
- Sealing existing ducts and replacing them are different scopes with different requirements. Be clear which you are buying.
- If somebody offers duct work with no testing and no permit, that is a decision you should make knowingly rather than by default.
Ask your building department: what counts as a substantial alteration to duct work here, and what leakage target applies?
Adding a ductless head means new refrigerant lines, a condensate route and almost always a new electrical circuit. The electrical side frequently needs its own permit or its own line on the same one.
- Ask how the condensate leaves. A pump on a wall is a maintenance item somebody will have to reach.
- Ask where the line set runs and how it is finished outside. This is the part people regret.
- If the property is a condo or has an HOA, exterior equipment usually needs their approval as well as the city's.
Ask your building department: does this need a mechanical permit, an electrical permit, or both — and is there anything specific about exterior equipment placement?
Replacing a capacitor, a contactor, a motor or a control board is a repair rather than an alteration, and repairs are not normally permitted work. The line gets blurry when a repair becomes a replacement — a new coil or a new heat exchanger is a different conversation.
- If a quote for a “repair” is approaching the cost of replacement, ask directly whether it is actually a replacement.
- Opening the refrigerant circuit is where a repair starts to look like an alteration to a building department.
- You should still get a written description of what was replaced and why, permit or no permit.
Ask your building department: at what point does a repair become an alteration requiring a permit here?
Commercial rooftop replacements and tenant improvements are normally permitted, and they often bring in structural review for the curb and the roof, electrical, and sometimes fire or mechanical plan check depending on the scope.
- Landlord consent usually has to come before the permit, not after. Establish who signs first.
- Crane time, roof access and out-of-hours working are scheduling questions that decide the real cost.
- A tenant improvement that moves partitions changes the air distribution even when it does not touch the unit. Get that looked at before the walls go up.
Ask your building department: what plan check applies to this scope, and does a rooftop change-out need structural review here?
What you should be holding when the job is finished
- The permit, finalledNot just issued — signed off. An open permit on a property is a problem that surfaces at sale, and it is far easier to close at the time.
- Any HERS certificate that appliedRegistered by the rater. It is the independent evidence that the work was tested rather than simply declared.
- A written scope and equipment listModel and serial numbers of what was fitted, so warranty claims and future service start from a fact.
- The measurementsAirflow, static pressure and, where the circuit was opened, charge. If nobody measured, nobody knows.
What this page is not
- Not legal or code adviceWe are a heating and cooling contractor, not a code consultant. What applies to your property is determined by your building department and by the version of the standards in force when you apply.
- Not current foreverCalifornia's energy standards are revised on a cycle. If this page has been sitting here a while, the department's answer is the one that counts.
- Not a judgement on past workA great deal of equipment in this county was changed out without a permit. Knowing that is useful before you sell; being alarmed about it is not.