Most homeowners meet the permit process only when a furnace or air conditioner needs replacing, so the rules often come as a surprise. The short answer for California: installing, replacing or adding heating and cooling equipment, and building new ductwork, usually needs a building permit and an inspection. Maintenance and most repairs do not. In Hayward, that permit goes through the City of Hayward’s building permit process.
Jobs that typically need a permit
- Replacing a furnace. A furnace connects to gas, venting and electrical power, and the code covers all three. Putting the new unit in the same closet as the old one is still a replacement.
- Replacing a central air conditioner or heat pump. The outdoor unit, the indoor coil or air handler, the refrigerant lines and the electrical supply are all part of the installation.
- Replacing a major component. Swapping the outdoor condensing unit, the indoor coil or the air handler usually counts as replacing equipment, even when the rest of the system stays.
- Changing the type of system, such as moving from a gas furnace to a heat pump, or adding air conditioning to a home that only had heat.
- New or replacement ductwork. A new duct system, replacing most of an old one, or extending ducts into an addition or a converted garage.
- Adding a ductless mini-split. Even a single-zone system usually needs its own electrical circuit, refrigerant piping through an outside wall and a condensate drain.
- Moving equipment, for example from a hall closet to the attic or the garage.
Work that usually does not
- Routine maintenance and seasonal tune-ups
- Filter changes
- Most repairs: a capacitor, contactor, blower motor, igniter or thermostat
- Clearing a clogged condensate drain
Rules differ between building departments, and a repair that changes gas piping, venting or wiring can cross into permitted work. If you are not sure, ask before the work starts. Permitting a job after it is finished is always harder than doing it first.
Who pulls the permit
For professional work, the licensed contractor doing the installation normally applies for the permit, schedules the inspection and makes sure the permit is closed out at the end. The application describes the equipment and the scope of the job. On a replacement it also ties into the energy-code paperwork explained in our Title 24 guide.
Two offers deserve a second look:
- “We can skip the permit and save you money.” The saving is small next to the trouble unpermitted work causes later, and a contractor who avoids inspections is telling you something about the installation.
- “You should pull the permit yourself.” Homeowners can take out a permit for work on their own home, but the person who holds the permit is the one responsible for the work. When a contractor is doing the job, a permit in your name is unusual and worth questioning.
Before you sign, you can look up any contractor’s license with California’s Contractors State License Board.
What the inspector checks
The inspection is a visual check of the finished work against the code and the manufacturer’s installation instructions. Depending on the job, the inspector typically looks at:
- Gas: the shut-off valve and the connection to the furnace.
- Venting: the flue or vent pipe, its slope and support, its clearance from anything that can burn, and where it ends outside. High-efficiency furnaces usually vent through plastic pipe and need a working condensate drain.
- Combustion air: a furnace in a closet or small room must get enough air to burn safely.
- Electrical: the circuit and breaker match the equipment’s nameplate, and the outdoor unit has a disconnect nearby.
- Access: the equipment can be reached and serviced, including a clear path to a unit in the attic.
- Drainage: condensate drains to a proper place, and equipment above a finished ceiling has a backup pan or secondary drain.
- Ducts: connections are sealed and supported, and ducts in the attic or crawlspace are insulated.
- Alarms: many inspectors also check that the home has working smoke and carbon monoxide alarms.
Where the energy code calls for duct testing or third-party verification, those results must be complete before the final sign-off. Larger jobs, such as a new duct system, can need more than one inspection visit. If something does not pass, the installer corrects it and the inspector returns. Once the job passes, the permit is “finaled”, and that record stays with the property.
Why it matters
Safety. A gas leak, a furnace that spills exhaust into the house and wiring that is too small for the load are exactly what an inspection is meant to catch. They are also problems a homeowner cannot easily see.
Warranty claims. Manufacturer warranties generally require installation according to the manufacturer’s instructions and can exclude failures caused by improper installation. A finaled permit is independent proof that the installation met code, which helps if a claim is ever questioned.
Selling the home. California’s seller disclosure forms ask whether work was done without the necessary permits. A buyer’s home inspector or agent can compare the equipment in the house with its permit history. Missing permits can lead to repair requests, a renegotiated price or a request to permit the work before closing.
Older work without a permit
If you learn that an earlier replacement was never permitted, it can often be permitted after the fact. The work is inspected like a new job, and anything that does not meet code has to be corrected. The inspector may need to see parts that are now hidden, so expect some access work. If you are buying a home and are unsure about its equipment, an HVAC inspection tells you what condition the system is in. That is a service check, not the city’s permit inspection, and it does not replace one.
A Hayward note: older homes, new ducts
Many Hayward ranch homes from the 1950s through the 1970s still have their original ducts, and in some slab-foundation homes those ducts run in or under the slab. When failing slab ducts are abandoned and new ones are run through the attic, that is new ductwork, and it goes through the permit and inspection process like any new system. The same is true when an original furnace is finally replaced: the new installation has to meet today’s code, so the vent and gas connection are often updated along with it.
Before the work starts
- Ask whether the quote includes the permit and the inspection.
- Confirm the permit is issued before the work begins.
- Plan for the inspector to need access to the equipment, sometimes inside the house.
- File the finaled permit with your other important house papers.
Whether the job is a furnace installation, an AC installation, a switch to a heat pump or ductwork repair, settle who handles the permit before you agree to the work, and get the answer in writing.