What GFCI outlet means
A GFCI is a ground-fault circuit interrupter: a receptacle or breaker that shuts off power in a fraction of a second when current leaks to ground, such as through a person.
Also called GFI, ground-fault circuit interrupter.
Where it matters on a electrical job
Missing GFCI protection is one of the most common items on home inspection reports, which makes it steady small work. Know which locations need it under the code your area enforces, and test every one you touch before you leave.
The numbers, with sources
- Receptacles serving kitchen countertops need GFCI protection. (IRC 2021, Chapter 39)
- So do receptacles within 6 feet of the top inside edge of a sink bowl. (IRC 2021, Chapter 39)
- Outdoor receptacles need it too. (IRC 2021, Chapter 39)
- So do receptacles in garages and in grade-level storage or work areas of unfinished accessory buildings. (IRC 2021, Chapter 39)
- On construction sites, temporary 120-volt, 15 and 20 amp receptacles in use by workers need GFCI protection. (OSHA)
What it costs
Jobs that involve GFCI outlet are priced in the electrical outlet installation cost guide: about $190 typical, usually $130 to $260. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Electrical outlet installation cost
- Licensing: Electrical license rules by state
- Tools, templates and guides: Free electrical resources
Sources: 2021 International Residential Code, Chapter 39, Power and Lighting Distribution (ICC); OSHA, 29 CFR 1926.404, Wiring design and protection. Checked October 9, 2026.