Lewis County, WA Home Business: Signage Rules (2026)

207, treats home-based businesses as a distinct, smaller category of commercial signage. Any sign has to be permitted unless it falls into one of the code's exemptions, and subsection (4)(n)(ii) puts home-based business signs in the exempt category at a specific size: one wall-mounted sign, not exceeding four square feet, and not illuminated. That's dramatically smaller than the two wall- or roof-mounted signs of up to 64 and 32 square feet that a typical commercial business is allowed under subsection (4)(n)(i). If the home business instead wants a freestanding sign, subsection (5)(d) applies the same four-square-foot ceiling: while other commercial uses can put up one freestanding sign as large as 64 square feet, a home-based business's freestanding sign is capped at four square feet.

Because the home-business sign qualifies as exempt under subsection (4), no separate sign permit is required for it, unlike most other commercial signage the code requires a permit for under subsection (2). The sign still has to comply with the code's general prohibitions, such as the ban on signs that create a traffic hazard or use flashing, revolving or wind-actuated elements. 120(4) cross-references this same four-square-foot standard when it lists what a home-based business is allowed to display.