Brentwood, CA Sign Regulations: Window Signs (2026)
Key Facts
- Coverage limit
- 25% of aggregate window area
- Display period
- 7 cumulative days per month
- Applies to
- Nonresidential establishments, per business
- Permit needed if compliant
- None
- Enforcement
- Nuisance per se, daily separate offense
Summary
Nonresidential temporary window signs in Brentwood cannot cover more than 25% of a store's aggregate window area and can be displayed only seven cumulative days per month per business, with no permit needed if the limits are met.
N. Temporary window signs, limited to a cumulative display period of seven days per month, per establishment. Maximum sign copy area shall not exceed more than twenty-five percent of the aggregate window area. Signs shall not be allowed within an area located between three feet and five feet above grade.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4604307; v5 updated 2025-12-09).
Full Breakdown
005 lists signs nonresidential properties may display without a sign permit, and subsection N governs temporary window signage directly: "Temporary window signs, limited to a cumulative display period of seven days per month, per establishment. " The seven-day allowance is cumulative across the month, so a business cannot post a sale banner for seven days, take it down, and post another unrelated temporary sign for seven more days in the same window within the same month; the total display time across all temporary window signs at that establishment is capped at seven days.
The 25% ceiling applies to the establishment's total window area, not each individual pane, so a shop with several storefront windows measures its combined glass area before sizing sale banners, holiday graphics or promotional posters. 835. 009 restrictions on illuminated, flashing or animated displays if the sign uses electronic elements.
Violations & Fines
A window sign that exceeds the 25% coverage cap or the seven-day cumulative monthly limit is no longer an exempt sign under Section 17.640.005 and is treated as an unpermitted sign in violation of Chapter 17.640. Section 17.640.010 makes any chapter violation a nuisance per se, with each day of non-compliance a separate offense subject to abatement by the city by any legal means.
Frequently Asked Questions
How much of my storefront window can a sale sign cover in Brentwood?
How long can a temporary window sign stay up?
Do I need a permit for a compliant window sign?
Sources & Official References
Other rules in Brentwood
California rules heatmap·Compare Brentwood to another location·View the California sign regulations overview
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Window Signs in Nearby Cities
How other cities in Contra Costa County handle window signs.