GFCI (ground-fault circuit interrupter) protection shuts off power within milliseconds when current leaks to ground, preventing shocks near water. AFCI (arc-fault circuit interrupter) protection trips when it detects the erratic arcing that starts electrical fires. Both are required in modern San Diego homes, but most houses built before the 2000s lack them entirely.
What GFCI and AFCI protection actually do
These two devices solve completely different problems, which is why newer kitchens and bedrooms need both.
A GFCI watches the balance between the hot and neutral wires. In a healthy circuit, the current going out equals the current coming back. If even a small amount (around 5 milliamps) leaks somewhere else, say, through a person standing on a wet bathroom floor, the GFCI senses the imbalance and cuts power in a fraction of a second. That speed is the difference between a startling jolt and a fatal shock. GFCIs are about protecting people.
An AFCI listens for the signature of dangerous arcing. Electricity is supposed to flow smoothly through intact wire. When a wire is damaged, a connection works loose, or a cord gets pinched under furniture, electricity can jump the gap and create high-temperature arcs that ignite wood framing or insulation. An AFCI recognizes that abnormal pattern and trips before a fire starts. AFCIs are about protecting the structure.
You’ll find both as breakers in the panel or, in the case of GFCIs, as the familiar receptacles with TEST and RESET buttons. Some modern breakers are dual-function (DFCI), combining both protections on a single circuit.
Where these protections are required
California has adopted the National Electrical Code, and over the years the list of required locations has steadily expanded. The exact requirement depends on when the home (or the specific circuit) was built or permitted, but the general direction is clear: more rooms, more often.
GFCI protection is generally required at receptacles in wet or damp areas, including:
- Kitchens (counter-top receptacles)
- Bathrooms
- Garages and accessory buildings
- Outdoors, including patios and pool/spa equipment areas
- Laundry areas and near utility sinks
- Crawl spaces and unfinished basements
This matters in San Diego specifically because so many homes have pools, spas, and outdoor kitchens. Equipment near a pool pump, a spa heater, or a backyard bar circuit is exactly the kind of wet-location wiring GFCI rules target. If you’re buying a property with a pool, this is worth close attention, and it’s one of the things we look at during a pool and spa inspection.
AFCI protection requirements have grown to cover most living areas in newer construction: bedrooms, living rooms, hallways, closets, and similar spaces. The logic is that these are the rooms full of cords, lamps, and outlets buried behind furniture, the places where slow-developing arc faults tend to start.
One important point: older homes are not illegal. Code generally applies at the time of construction or when work is permitted. A 1965 Kensington bungalow with no AFCIs anywhere isn’t violating anything by simply existing. But that gap is a genuine safety consideration for a buyer, and it’s a frequent topic in our buyer’s inspections.
Why so many San Diego homes lack them
San Diego County has a deep stock of mid-century and older housing, think North Park, Normal Heights, La Mesa, Chula Vista’s older tracts, and the historic pockets of Coronado and Point Loma. The age of that housing is precisely why electrical protection is so often missing.
GFCI receptacles didn’t become widely required until the 1970s and expanded room by room for decades afterward. AFCI requirements are even newer, first appearing for bedrooms around 1999 and broadening through the 2000s and 2010s. So a home built before those dates almost never has them unless someone upgraded the wiring later.
On top of age, we regularly see two San Diego-specific complications:
- Older panels and wiring methods. Homes from the 1950s through 1970s may have outdated panels, two-prong (ungrounded) outlets, or even cloth-insulated wiring. Adding modern protection to those systems isn’t always a simple swap. We cover the broader panel picture in our guide to electrical panel problems in older San Diego homes.
- Unpermitted DIY work. In a hot market, a lot of garages get converted, ADUs get added, and outdoor circuits get run by handy owners. We frequently find newer-looking outlets with no actual GFCI/AFCI protection behind them, the cover plate is modern, but the safety device isn’t there.
What a home inspector tests, and what we don’t
A general home inspection is a visual, non-invasive assessment. Within those limits, here is what we actually do regarding GFCI and AFCI protection:
- Operate accessible GFCI devices. We press TEST and RESET on reachable GFCI receptacles and check that the device responds. We also use a plug-in tester at representative outlets to confirm protection is present where it should be.
- Identify missing protection. We note kitchens, baths, garages, and exterior outlets that lack GFCI protection given the home’s era and the apparent scope of any updates.
- Check the panel for AFCI/GFCI breakers. We document what’s installed and flag obvious gaps, miswiring, double-tapped breakers, and similar concerns visible at the panel.
- Test reverse-polarity and open grounds at representative receptacles, since those affect whether protection even works correctly.
What a general inspector does not do: we don’t dismantle walls, pull every outlet, or load-test the system, and we are not a substitute for a licensed electrician or, for capacity and design questions, an electrical engineer. If we find significant concerns, the right next step is evaluation by a licensed C-10 electrical contractor. This is part of the broader principle behind what a home inspection does and doesn’t cover.
Simple upgrades that close the gap
The good news is that adding protection is usually far cheaper than rewiring a house. Common, electrician-performed fixes include:
- GFCI receptacles installed at kitchen counters, baths, garages, and exteriors. A single GFCI can often protect downstream outlets on the same circuit.
- GFCI or AFCI breakers swapped in at the panel, when the panel is compatible.
- Dual-function (combination) devices that deliver both protections where current code calls for them.
Whether a given upgrade is straightforward depends on the panel, the wiring, and whether circuits are properly grounded, which is exactly why these recommendations should come from a licensed electrician after a hands-on look. Always pull permits for electrical work, and verify any contractor’s CSLB license before they touch your panel.
If you’re buying an older property, treat electrical protection as a standard checklist item rather than an afterthought. For a full walkthrough of what to watch for, see our San Diego home inspection checklist, and when you’re ready, contact The Real Estate Inspection Company at (619) 752-4399 to schedule an inspection with InterNACHI Certified Professional Inspector Joseph Romeo.
