When Building New, When Should Outside Electrical Boxes Be Installed?

Before drywall installation, it is essential to consider the following items: electrical, plumbing, and HVAC. Electrical installations include all wiring and boxes for wall outlets, switches, and light fixtures. Plumbing includes drain lines, hot and cold water lines, and a weatherproof in-use cover. Outdoor electrical boxes are crucial for power distribution, especially for holiday lights. They must be installed at least 6 1/2 inches above grade, and in garages, 18 inches or more above the floor.

Routing cable in new construction is easy, but it is important to sketch out your plan on paper. Different types of electrical installations include residential, commercial, and industrial. Exterior outlet boxes are typically installed after the wall is finished with waterproof conduit for wiring runs. They are completed after siding is completed.

There are advantages to having exterior electrical roughed in before siding starts. Surface mount boxes are installed after the siding, while some boxes can be installed before the siding and just the weather. A “loop” in the wall is left, and sheetrock is covered and finished. If needed, an electrician can cut a hole for future use.

Installing electrical boxes before the exterior finish is necessary for code compliance and safety. The first thought was to install a flush mount box next to the stud, with the front edge flush with the siding. Wire to the box inside and install a weatherproof receptacle with a GFCI protected NM cable. This option is only recommended for new construction or if open studs are behind the siding.