Permits & code compliance
Your HVAC replacementlegally needs a permit.
California requires a mechanical permit and independent field verification on nearly every system changeout. It is also the single biggest reason one quote comes in thousands cheaper than another — and the reason that cheaper quote is not the same job.
Last verified: August 1, 2026
Why quotes differ by thousands
A permitted install and an unpermitted one are not the same product
When two companies quote the same system and the numbers are far apart, the gap is rarely the equipment. It is usually the permit, the compliance documentation, the independent verification, and the duct work that verification tends to expose.
Skipping all of that is cheaper. It is also illegal, and the liability lands on you as the homeowner as much as on the contractor who did it. Unpermitted HVAC work is common in the Valley, and it stays invisible right up until you try to sell the house.
Nobody is going to volunteer that their quote excludes the legally required parts of the job. You have to ask.
When a permit is required
The California Mechanical Code requires a building permit for HVAC installations and modifications, including all of the following.
- Any new HVAC installation
- A changeout or replacement of the air handler, coil, furnace or condenser
- Relocating an existing HVAC unit
- Removing an HVAC unit or system
- Adding ductwork
- Most alterations to an existing system beyond simple part replacement
A routine repair — a capacitor, a motor, a control board — does not require a permit. Replacing equipment does. If a contractor tells you a full changeout does not need one, that is not a shortcut they are doing you a favour with.
What changed on January 1, 2026
If you had HVAC work done before this year you may remember a "HERS test." The requirement has not gone away — it moved, and it has a new name that most contractor websites have not caught up with.
HERS field verification became ECC verification
California's 2025 Energy Code took effect on January 1, 2026. The field verification and diagnostic testing that used to sit inside the HERS Program moved into the Energy Code Compliance (ECC) Program under Title 24. Same tests, same purpose, different program name.
Your HERS rater is now an ECC rater
All HERS Providers were recognised as ECC-Providers on January 1, 2026, and HERS raters as ECC-Raters. The independent third party who tests your installation is the same kind of professional doing the same job.
Older paperwork still says HERS
Documentation issued under previous Energy Code cycles continues to display "HERS." Documentation under the 2025 Energy Code displays "ECC." If your certificate says one and someone tells you it should say the other, that is usually just which code cycle your permit falls under.
"HERS" has not disappeared entirely
The whole-house rating and home energy audit side of the HERS Program still exists under that name. It is only the code-compliance testing that moved to ECC.
There is an allowance for urgent changeouts
Verification is part of the permit process, and a qualifying permit application should normally include a registered certificate of compliance. There is an exception for urgent alterations such as HVAC changeouts, which allows the certificates to be registered later — but before the permit is closed out. In practice that means a failed system in July does not have to sit waiting on paperwork before work can start.
Verified against the California Energy Commission's Energy Code Compliance Program on August 1, 2026.
What actually gets tested
An independent, state-certified rater — not us, and not the building inspector — measures the installation and files the results.
Duct leakage
The duct system is pressurised with a calibrated fan and the leakage measured against the allowable threshold. This is where a lot of Fresno homes fail first, because attic heat destroys flex duct. More on duct testing.
Airflow across the coil
Measured to confirm the system is actually moving the air it was designed to move. An install that passes on paper and fails on airflow will underperform for its entire life.
Refrigerant charge
Verified independently rather than taken on the installer's word. Incorrect charge is one of the most common causes of premature compressor failure in this climate.
Not every measure applies to every project. Which tests are triggered depends on the scope of work and your jurisdiction — ask us what yours will require before you commit to anything.
Fresno has two building departments
Which one handles your permit depends on whether your address sits inside city limits or in unincorporated Fresno County. They are separate processes with separate portals.
Inside city limits
City of Fresno
Building and Safety, within the Planning and Development Department. Permits are applied for, paid, tracked and inspected through the City's online portal.
- Same-day express permits are available for straightforward mechanical work
- Simple scopes can use a permit affidavit with itemised equipment rather than full plans
- Inspections are scheduled through the same portal
Unincorporated areas
County of Fresno
Building and Safety, within Public Works and Planning. Covers addresses outside city limits, including much of the rural area around Fresno and Clovis.
- HVAC applications require registered energy compliance documentation
- Furnace and water heater changeouts also require energy documentation
- Applications are handled through the County citizens portal
What skipping the permit actually costs
The saving is real. So is everything that comes with it, and most of it lands on the homeowner rather than the contractor.
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It surfaces when you sell
Unpermitted work is a disclosure issue in a California sale. Buyers' inspectors look for equipment that does not match permit history, and the fix at that point is retroactive permitting on someone else's timeline, often with a price reduction attached.
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Insurance can decline the claim
If unpermitted equipment contributes to a fire or water loss, an insurer has grounds to dispute coverage. It is not a certainty, but it is a risk you took on for a discount you probably did not know you were being given.
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The manufacturer warranty may not stand
Warranty terms typically require installation to code by a licensed contractor. A changeout that was never permitted or verified is difficult to defend when you need a compressor covered eight years later.
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The contractor is risking their license, not just a fine
Performing work that requires a permit without obtaining one is a violation the state licensing board disciplines, with civil penalties and potential suspension or revocation. A contractor willing to take that risk on your house is telling you something about how they work.
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Nobody ever verified the install
This is the part that costs you every month rather than once. No duct test, no airflow measurement, no independent charge verification — so an install that is quietly wrong stays quietly wrong, and you pay for it on every PG&E bill.
How we handle it
Permit and verification are in the quote, not added later
We pull the permit for your jurisdiction, coordinate the independent verification, and close the permit out. It is part of the price you approve rather than a line that appears afterwards.
It also means our replacement quotes will sometimes look higher than one that leaves all of it out. When you compare, the useful question is not which number is smaller — it is which quote is for the complete legal job.
Included on every replacement
- The mechanical permit pulled with the correct jurisdiction for your address
- Energy compliance documentation prepared and registered
- Independent ECC verification scheduled and coordinated, not left to you
- A load calculation rather than matching the tonnage that just failed — more on sizing
- The permit closed out, with the paperwork handed to you for your records
Comparing quotes
Ask whether the permit and verification are included
It is the fastest way to find out whether two replacement quotes are actually for the same job. If you already have one in hand and the answer is unclear, we will look at the scope alongside our own diagnostic and tell you what is missing. Free, no obligation.
Permit questions
Do I really need a permit to replace my air conditioner?
Yes. The California Mechanical Code requires a permit for HVAC changeouts, including replacing the condenser, coil, furnace or air handler. A routine repair does not require one, but replacing equipment does.
What is the difference between HERS and ECC?
They are the same testing under a different program. On January 1, 2026, with the 2025 Energy Code, California moved field verification and diagnostic testing out of the HERS Program and into the Energy Code Compliance (ECC) Program under Title 24. HERS raters became ECC raters. Older paperwork still says HERS; work permitted under the 2025 code says ECC.
Does the permit delay an emergency replacement?
Generally no. There is an allowance for urgent alterations such as HVAC changeouts that lets the compliance certificates be registered after the fact, provided it happens before the permit is closed out. The City of Fresno also offers same-day express permits for straightforward mechanical work.
Who pays for the permit and the verification?
It forms part of the total job cost. We include both in the quoted price rather than adding them afterwards, so what you approve is what you pay.
What if my last system was installed without a permit?
It is more common than most homeowners realise. Retroactive permitting is usually possible, and it is far easier to deal with now than during a sale when a buyer's inspector finds it. Tell us when we quote and we will explain the options for your jurisdiction.
Is my address City of Fresno or Fresno County?
It depends on whether you are inside city limits. They are separate building departments with separate processes. We confirm the correct jurisdiction as part of quoting your job, so you do not have to work it out.
Get a quote for the complete job
Permit, load calculation and independent verification included in the price, not discovered afterwards.
This page is general information about California code requirements, not legal advice. Requirements, program administration and local processes change, and enforcement is handled by your local building department. Verify current requirements with the City of Fresno or Fresno County Building & Safety and the California Energy Commission. Last verified August 1, 2026. California Heating & AC Repair is operated by Craftline Renovations, Inc. · CSLB License #999179.