The 6-12 rule is one of those electrical-code phrases tossed around at the hardware store with confidence by people who do not actually know what it means. The outlet spacing code in the National Electrical Code (NEC) is more nuanced than a single phrase, and it changes depending on whether you are wiring a bedroom, kitchen, hallway, or bathroom. The rules exist to ensure no one ever has to run an extension cord across a room because the nearest receptacle is too far away. Following them is also non-negotiable for permit inspections, and even if you skip the permit, the next homeowner’s inspector will catch it during a sale. Here is a clean breakdown of every spacing requirement that matters.
The 6-12 Rule (NEC 210.52)
In every habitable room of a dwelling, including living rooms, bedrooms, dens, family rooms, recreation rooms, and similar spaces, receptacles must be installed so that no point along any wall is more than 6 feet from a receptacle. In practice, this means:
- The first receptacle on any wall must be within 6 feet of any door, opening, or wall start
- Subsequent receptacles must be within 12 feet of each other
- Any wall section 24 inches or wider counts as a “wall” requiring its own receptacle if isolated by openings
The logic behind the spacing is that any standard 6-foot lamp cord should reach an outlet without extension. Walk through your living room with a 6-foot tape measure and check; any spot more than 6 feet from a receptacle is an open invitation for an extension cord and a code violation.
Kitchen Counter Receptacles
Kitchen counter spaces have their own stricter rule because of the high concentration of small appliances. NEC 210.52(C) requires:
- Any countertop section 12 inches or wider must have at least one receptacle
- No point along a countertop wall can be more than 24 inches from a receptacle
- Island and peninsula counters need at least one receptacle if the surface is 12 inches or more by 24 inches or more
- All kitchen counter receptacles must be on at least two 20-amp small-appliance branch circuits
The 24-inch maximum distance translates to receptacles roughly every 4 feet along a counter. For a 10-foot run of cabinets between a stove and a corner, you need a minimum of two outlets. Most builders install three or four because the cost difference is trivial and the convenience is significant.
GFCI and AFCI Requirements
Most rooms now require AFCI protection on the entire branch circuit, including bedrooms, living rooms, dens, family rooms, hallways, closets, and similar areas. GFCI protection is required at all kitchen counter receptacles, all bathroom receptacles, all garage receptacles, all outdoor receptacles, all unfinished basement receptacles, and any receptacle within 6 feet of a sink or wet bar.
The 2020 NEC and later require dual-function AFCI/GFCI protection in many shared zones, and most jurisdictions adopt the latest code within 2 to 4 years of publication. Before pulling a permit, ask your local building department which NEC edition they enforce; some areas are still on 2017, others on 2023.
Bathroom Receptacle Rules
Every bathroom requires at least one receptacle within 36 inches of the outside edge of each sink basin. The receptacle must be GFCI-protected and on a 20-amp dedicated bathroom circuit that supplies only bathroom receptacles. Lighting and the exhaust fan can be on a separate 15-amp or 20-amp circuit.
Bathroom outlets cannot be installed face-up in a countertop or in the floor within the bathroom area. They must be on a wall or in a vertical face of the cabinetry. A horizontal pop-up countertop outlet is not allowed in bathrooms even if it is GFCI-rated.
Hallway Outlet Spacing
Any hallway 10 feet or longer requires at least one receptacle. NEC does not specify a maximum distance, but most builders install one every 25 to 30 feet of hallway length. The receptacle is generally placed near a logical use point, like next to a console table or where a vacuum would be plugged in for cleaning.
Bedroom Specific Requirements
Bedrooms follow the standard 6-12 rule for habitable rooms but require AFCI protection on every receptacle since the 1999 NEC. The rationale is that bedroom fires from electrical issues happen most often when occupants are sleeping. AFCI breakers add about $35 to $50 each at the panel and are non-negotiable for new bedroom circuits.
Outdoor and Garage Outlets
Every dwelling must have at least one outdoor receptacle accessible at grade in the front and one in the back. They must be GFCI-protected and weather-resistant (WR-rated). The standard mounting height is 12 to 18 inches above grade.
Garages require at least one wall receptacle in each parking space, and the 2020 NEC added a requirement for at least one outlet on each long wall regardless of vehicle use. All garage receptacles need GFCI protection and most jurisdictions also require AFCI on garage receptacles in attached garages with living space above.
Laundry Room Receptacles
The laundry room must have at least one 20-amp dedicated laundry circuit. The washer outlet should be within 6 feet of the washer location. The dryer outlet, if electric, requires a 30-amp 240-volt outlet on a dedicated 10/3 circuit with a NEMA 14-30 receptacle. Gas dryers use a standard 120-volt outlet.
Receptacle Mounting Heights
NEC does not actually specify a standard mounting height for receptacles in most rooms; that is a building convention. Common heights:
- General rooms: 12-18 inches above the finished floor (center of box)
- Above kitchen counters: 4-6 inches above the countertop
- Backsplash receptacles: 44-46 inches off the finished floor (above standard 36-inch counter and 4-inch backsplash)
- Bathroom vanity: 40-44 inches off the finished floor
- Above mantels and built-ins: Match adjacent fixture heights
For accessibility-focused remodels, mount receptacles at 18 to 20 inches off the floor so they are easily reachable from a wheelchair or by someone using a walker.
Tamper-Resistant Receptacles
Since the 2008 NEC, all 15- and 20-amp receptacles in dwelling units must be tamper-resistant (TR-marked). The internal shutters prevent objects from being inserted into a single slot. Tamper-resistant receptacles cost roughly $1.50 each compared to $0.79 for non-TR. They are required in every receptacle replacement and new install.
When to Skip DIY
Spacing rules are easy to follow during planning. Pulling a permit, running new circuits, sizing breakers, and tying into a panel are not. If your project requires a new circuit or new panel space, hire a licensed electrician. Code compliance during inspection requires correct conductor sizing, AFCI/GFCI protection, proper torque on all terminations, and a balanced panel. A failed inspection costs more in time and rework than the original electrical bid would have.
