Sign Regulations in San Marcos, CA (2026)
5 verified sign regulations for San Marcos, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Political Signs
San Marcos lets political and other protected non-commercial signs go up in every zone without a permit under Municipal Code Section 20.320.060(C), capping display area at 16 square feet per parcel outside election season. During the 35-day run-up to any election and the 10 days after, the cap disappears and each sign can grow to 32 square feet.
San Marcos Political Sign Rules
Some RestrictionsSan Marcos Municipal Code § 20.320.060(C)(1)
v.The total display area of all such signs on a given parcel is limited to sixteen (16) square feet at all times, except as set forth in Section 20.320.060.C.1.d.vi (Temporary Signs in Commercial and Industrial Zones), below.vi.During the pre-election period, which begins thirty-five (35) calendar days before any primary, general, or special election, and ends ten (10) calendar days after such ...
Garage Sale Signs
San Marcos treats a garage sale sign as one of the message types allowed on a single-family or multi-family residence under Municipal Code Section 20.320.050(F)(1), but it must fit inside the property's four-square-foot total residential sign allowance. No permit is required, illumination is banned, and the sign's printed copy cannot cover more than 75 percent of its face.
San Marcos Garage Sale Sign Rules
Some RestrictionsSan Marcos Municipal Code § 20.320.050(F)(1)
1.Residences.a.Total display area allowed: four (4) square feet at all times.b.Number of signs: not limited.c.Coverage ratio: The maximum allowable copy area for sign copy shall be seventy-five percent (75%) of the total display area of the sign.d.Illumination: illumination is prohibited.e.Message types allowed: protected non-commercial, real estate, name plate (not exceeding two (2) square fee...
Digital Billboards
San Marcos bans construction of any new billboard outright and forbids converting an existing legal billboard to digital display, electronic changeable image display, or a Business and Professions Code 'message center' under Zoning Ordinance Section 20.320.030(H). The Director must deny any permit that violates the policy and take immediate action against a billboard built or maintained in violation.
San Marcos Digital Billboard Ban
Heavy RestrictionsSan Marcos Zoning Ordinance § 20.320.030(H)
H.Billboard Policy. New "billboards," as defined herein, are prohibited. The City completely prohibits the construction, erection, or use of any billboards, other than those that legally exist in the City. No existing, legal billboard may be converted to digital display, electronic changeable image display, or to function as a "message center" as that term is defined in Business and Professions...
Window Signs
San Marcos caps window signage at one-third of a storefront's window area under Municipal Code Section 20.320.050(A)(3), counting permanent and temporary signs together. The limit applies to all commercial and neighborhood commercial zones and to industrial parcels, and tobacco retailers face a stricter cross-referenced version of the same one-third rule.
San Marcos Window Sign Coverage Limit
Some RestrictionsSan Marcos Municipal Code § 20.320.050(A)(3)
3.Maximum window sign area - Window signs. All window signs combined, permanent and temporary, shall not exceed an area one-third (1/3) the area of frontage window area.
Freeway-Facing Signs
Along the State Route 78 view corridor, San Marcos bans the temporary window signs described in Municipal Code Section 20.320.060(B)(5)(c), the paper or cloth signs businesses tape up for sales, under Section 20.320.090(F). The only carve-out is signage tied to an authorized parking lot sale.
San Marcos SR-78 Corridor Sign Ban
Significant RestrictionsSan Marcos Municipal Code § 20.320.090(F)
F.State Route 78 View Corridor. Except as permitted for parking lot sales authorized under this Zoning Ordinance, temporary advertising signage as described in Section 20.320.060.B.5.c (Temporary Signs in Commercial and Industrial Zones), within the State Route 78 view corridor are prohibited.G.Pole Signs. As defined in Section 20.320.120 (Definitions).H.Mobile Messaging Signs. As defined in Se...
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