How to draw electrical plans for a house

A residential electrical plan is your floor plan with the electrical work drawn on top: the panel, receptacles, switches, lights, fans, appliance circuits and alarms, each shown with a symbol. It isn’t a wiring diagram. It shows what goes where and what controls what, not the path of every cable.

Not every job needs one. Many departments want an electrical plan for a new house, an addition, an accessory dwelling or a major remodel, and a simple permit form for smaller work. Some require a licensed electrician to pull the permit. Ask before you draw.

1. Start from a dimensioned floor plan. Show walls, doors, windows, room names, cabinets and major appliances. Use light line weights so the electrical symbols stand out.
2. Locate the panel. Mark the main panel, any subpanels and the meter, and note the service size, such as 200 amps. The code requires clear working space in front of a panel and keeps panels out of bathrooms and clothes closets.
3. Place receptacles. Put them along the walls of each room, over kitchen and bathroom counters, and in the garage, laundry and outdoors. The code limits how far apart receptacles can be along walls and counters, so a long wall usually needs more than one.
4. Add switches and switch legs. Put a switch at each room’s entrance, on the latch side of the door. Where a light is controlled from two places, like the ends of a hall, use three-way switches. Draw a dashed switch leg from each switch to everything it controls.
5. Add lighting. Show ceiling lights, recessed lights, fans and exterior lights. The code requires switched lighting in most rooms, hallways, stairways and outdoor entrances, and allows a switched receptacle instead in some rooms.
6. Mark dedicated appliance circuits. Large and fixed appliances usually get their own circuit: range, oven, dryer, water heater, furnace, heat pump or air conditioner, dishwasher, well pump and EV charger. Label each one with its use, voltage and amperage from the nameplate, such as “dryer, 240 V, 30 A.”
7. Show smoke and CO alarms. Under the International Residential Code, which most states base their rules on, smoke alarms go in each bedroom, outside each sleeping area and on every level, including basements. In new construction they’re hardwired with battery backup and interconnected. Carbon monoxide alarms go outside each sleeping area when the home has fuel-burning appliances or an attached garage.
8. Add the legend and notes. Define every symbol you used. See your legend and notes below.
9. Add a load calculation or panel schedule if asked. See when they’re required.

Here’s a small residential electrical plan example: one bedroom and a hall, drawn with the steps above.

These are common conventions for residential electrical plan symbols. Symbols vary between offices, designers and software, and your legend defines what yours mean.

Put the legend on the electrical sheet. Show each symbol exactly as drawn, name it in plain words, and leave out symbols you didn’t use.

General notes cover what the symbols can’t. Common ones:

• The code edition the work follows, as adopted by your jurisdiction
• GFCI and AFCI protection as required by the adopted code
• The wiring method, such as nonmetallic cable or conduit
• Smoke and CO alarms hardwired, with battery backup, and interconnected
• Mounting heights you want, if they differ from standard

Electrical rules in the United States come from the National Electrical Code (NFPA 70), which is used in every state. But each state or city adopts a particular edition, sometimes an older one, often with its own amendments.

In broad terms, the NEC calls for GFCI protection where water and electricity meet, such as bathrooms, kitchens, laundry areas, garages and outdoors, and AFCI protection for many circuits serving living areas. Exactly which locations and circuits depends on the edition your area adopted. Your building department can tell you, and many publish a residential electrical handout.

This guide is general. Confirm every requirement with your local building department before you draw or build.

A service load calculation adds up the home’s expected demand to show the service and panel are big enough, using methods from the NEC. Departments commonly ask for one with a new house, a service upgrade, or a big new load such as an EV charger, heat pump, electric range or hot tub.

A panel schedule lists every breaker: its number, size and what it feeds. Some departments want one for a new or replaced panel, and it becomes the directory on the panel door. If the calculation is new to you, it’s a good place to ask an electrician for help.

AI CAD PRO is free residential electrical plan software for Windows. Start from your floor plan and describe what goes where. Astra, the AI assistant, places receptacles, switches, lights and panels from the electrical symbol library, and you can move or edit each one by hand. Astra runs on your own ChatGPT subscription.

The electrical sheet sits in the same set as your floor plan, site plan and one-line diagram, and print preview matches the exported PDF. Adding solar? See the solar one-line diagram guide. Drafting checks flag missing connection or specification data, but they aren’t a code review, and the app doesn’t do the load calculation for you.