Thurston County, WA Home Business: Signage Rules (2026)
Key Facts
- Size cap
- 2 square feet
- Mounting
- Must be flush-mounted to building
- Illumination
- No internal or nighttime lighting
- Off-premises
- Prohibited outright
- Penalty
- Misdemeanor, each day a separate offense
Summary
A home occupation sign in unincorporated Thurston County is capped at two square feet under Code Section 21.75.180(B)(2), must be flush-mounted against the building rather than freestanding, and cannot be illuminated internally or at night. Off-premises advertising for a home business is banned outright, and any sign that does not meet these limits can be cited as a misdemeanor under Section 21.75.250.
B.Size and Type. ... 2.Home Occupations. Home occupation signs relate to home occupation as defined in the Zoning Ordinance. The sign shall be flush-mounted and shall not exceed two square feet in area, and cannot be internally illuminated, nor illuminated at night. Off-premises signs are prohibited. ... 21.75.190 - Variances. Variances from provisions of this chapter may be granted by the hearing examiner in accordance with Chapter 2.06 of the Thurston County Code. ... 21.75.250 - Violation—Penalty. A.Violation of the provisions of this code or failure to comply with any of its requirements shall constitute a misdemeanor and such violation shall be punished as provided by the statutes of the state of Washington for the commission of a misdemeanor. Each day such violation continues shall be considered a separate offense.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 77).
Full Breakdown
180(B), and home occupations get the tightest allowance of any use in that table: two square feet, versus twelve square feet for a nonresidential use in a residential district or up to several hundred square feet for commercial and industrial monument and wall signs elsewhere in the same subsection. 180(F), which otherwise just requires white or yellow, non-blinking light. Off-premises signs, meaning advertising for the home business displayed somewhere other than the home itself, are prohibited outright. 180. 06. 200 unless it is structurally altered, meaning any change to its height, size, shape, base, or supports, at which point it must be brought into full compliance with the two-square-foot cap.
Violations & Fines
Exceeding the two-square-foot home occupation sign limit, illuminating the sign internally or at night, or advertising the business off-premises violates Section 21.75.180(B)(2) and is a misdemeanor under Section 21.75.250, punishable under Washington's misdemeanor statutes, with each day the violation continues counted as a separate offense. An unlawful sign that isn't removed within thirty days of a conviction can be taken down by the county under Section 21.75.260, with removal costs charged to the sign's owner.
Frequently Asked Questions
How big can a home business sign be in Thurston County?
Can I put up a sign advertising my home business somewhere other than my house?
What happens if my home business sign is too big or lit up at night?
Sources & Official References
Other rules in Thurston County
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