Boston, MA Sign Regulations: Window Signs (2026)
Key Facts
- Permanent window sign cap
- 30% of glass area
- Temporary sale/event sign cap
- 30% of window area
- Permit needed for temporary sign
- None required
- Applies to
- Non-residential districts
- Ground-floor windows
- Counted toward sign total
Summary
Outside residential districts, Boston caps window signage under Zoning Code Article 11, Section 11-2(c) and (f). A permanent, non-illuminated sign on the inside of a window glass cannot exceed thirty percent of the total glass area, and a temporary sale or event sign lasting more than fifteen days follows the same thirty percent cap without needing a permit.
A permanent non-illuminated sign on the inside of the glass of a window, provided that the total area of the sign does not exceed thirty percent of the total glass area of windows appurtenant to the use to which the sign is accessory, and provided that signs on ground floor windows be included in calculating the total area of signs on a sign frontage. ... Temporary signs pertaining to special sales or events lasting more than fifteen days may be affixed to windows provided that their total area does not exceed thirty percent of the window. No permit is required for such temporary sign or signs.
Full Breakdown
Section 11-2, titled 'On-Premise Signs in all Other Districts,' governs commercial and other non-residential zoning districts (residential districts run under the separate, tighter Section 11-1 list). Paragraph (c) allows 'a permanent non-illuminated sign on the inside of the glass of a window, provided that the total area of the sign does not exceed thirty percent of the total glass area of windows appurtenant to the use to which the sign is accessory,' and requires that ground-floor window signs be included when a business calculates its total sign area on a sign frontage.
Paragraph (f) separately covers temporary signage: signs for 'special sales or events lasting more than fifteen days' may be affixed to windows up to the same thirty percent cap, and 'no permit is required' for them. Both limits are measured against the glass or window area they cover, not the whole storefront, and both feed into the building's broader sign-frontage total set later in Article 11 (a multiplier of 2 to 5 times sign frontage depending on distance from the street center line, with a 50-square-foot floor for narrow storefronts).
A business that wants signage beyond either cap can seek a 'comprehensive sign design' certification from the Urban Design Department of the Boston Redevelopment Authority, which lets total sign height and area exceed the normal limits if it is found to be a harmonious design.
Violations & Fines
The Building Commissioner enforces Article 11's sign limits under Section 5-1. A permanent or temporary window sign that exceeds thirty percent of the glass or window area is a code violation subject to a removal order; exceeding the limit without pursuing a BRA Urban Design Department comprehensive sign design certification or a Board of Appeal conditional permit under Section 11-9 leaves the sign nonconforming.
Frequently Asked Questions
How much of my storefront window can I cover with a permanent sign?
Do I need a permit for a temporary 'Sale' sign in my window?
Does this window sign rule apply to a home in a residential district?
Sources & Official References
Other rules in Boston
Compare Boston to another location·View the Massachusetts sign regulations overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Window Signs in Nearby Cities
How other cities in this county handle window signs.