Local zoning · Foster City

Foster City — Signage

Q: How does Foster City measure allowable wall sign area?

Use the definitions in § 17.59.030 : "affected wall surface area" and "business frontage" control the denominator for wall sign percentages; numeric limits for wall signs are in § 17.59.100 (for example, retail/office wall signs are calculated at 0.5 sq ft per linear ft or a baseline square footage) .

Q: If my sign projects over the sidewalk, what rules apply?

Projecting signs have a maximum face area (generally 5 sq ft for tenant identification), a maximum projection ( 4 ft ), and required clearances (e.g., 14 ft high with at least 8 ft pedestrian clearance); projections into public right-of-way also require an encroachment permit — see the projecting sign entries in § 17.59.100 .

Signage under the Foster City local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page summarizes Foster City’s sign control rules as adopted in Title 17, Chapter 17.59 (Sign Control). It explains who issues permits, which sign types are allowed or prohibited, the most-used numeric limits (area, height, number), and how the city reviews special programs or exceptions. The ordinance’s purpose and applicability are found at § 17.59.010 and § 17.59.020 .

Important internal resources you may need while applying: consult the Foster City Zoning map, be prepared for design review when required, and check parking or development standards that interact with signage.

How the code is organized (brief)

Chapter 17.59 sets purpose, definitions, permit rules, measurement, exemptions, prohibited signs, temporary sign rules, public-convenience signs, development standards (tables), signs for specific uses, master sign programs, and construction/maintenance (see table of contents at § 17.59.010–140) .
Definitions that control measurement and placement (for example affected wall surface area, aggregate total glass surface area, and business frontage) are in § 17.59.030 and are used throughout the numeric tables .

District / Use-category breakdown

The sign chapter organizes standards by use categories rather than listing a separate sign rule for each zoning label. The ordinance uses the following use-based tables; where the exact zoning label (e.g., R‑1, C‑1) is needed for a parcel, verify its zoning on the Foster City Zoning map and confirm which use-table applies. The tables and program rules are in § 17.59.100 and the master sign program rules are in § 17.59.120 .

Residential (applies to residential developments as described in the tables)

Purpose: permit identity signs for communities, address signs, and limited directional signs while protecting neighborhood character (see § 17.59.100 A). Source: § 17.59.100 .
Typical permitted sign types: community freestanding identification signs, single‑home address signs (exempt), directional signs (subject to § 17.59.090). See § 17.59.090 and § 17.59.100(A) .
Key numeric standards (selected): one freestanding community sign on primary frontage; max 20 sq ft area; max 4 ft height for community freestanding signs (Table 2‑A) § 17.59.100(A) .
Where it applies: subdivisions, townhouses, condominiums, apartment properties as described in Table 2‑A; townhome/condo developments of 50+ units require a master sign program per § 17.59.120(B)(1) .

Office (office campus / single office building standards)

Purpose: allow identification for office centers while limiting scale and illumination § 17.59.100(C) .
Typical permitted sign types: freestanding identification sign for office centers, wall signs for major tenants, directional signs (see Table 4‑A) § 17.59.100(C) .
Key numeric standards (selected): office center freestanding sign: 10 sq ft per acre (max); freestanding height 4 ft; wall/building sign allowed at 0.5 sq ft per linear foot of frontage or 25 sq ft, whichever is less, with max height noted in table § 17.59.100(C) .
Where it applies: office buildings and office centers (Table 4‑A); large office centers may be required to prepare a master sign program § 17.59.120(B)(3–4) .

Commercial (single businesses, retail centers)

Purpose: balance business visibility and pedestrian-friendly streetscapes § 17.59.010 .
Typical permitted sign types: wall signs, freestanding signs (in lieu of wall signs for single commercial businesses), projecting signs, awning/canopy signs, window signs, directional signs (Table entries in § 17.59.100). See specifics in § 17.59.100 .
Key numeric standards (selected): single commercial business freestanding sign (in lieu of wall sign) max 24 sq ft, max height 6 ft; wall sign calculation: 0.5 sq ft per linear foot of business frontage or 20 sq ft, whichever is greater; no wall sign may exceed 50 sq ft or 15% of building face, whichever is greater § 17.59.100 .
Where it applies: single businesses and commercial centers. Retail/shopping centers with 5+ tenants and commercial centers of 5+ acres must prepare a master sign program § 17.59.120(B)(2–3) .

Industrial (light industrial / industrial centers)

Purpose: identification of centers while minimizing sign massing and limiting content to identification (Table 5‑A) § 17.59.100(D) .
Typical permitted sign types: freestanding identification signs for industrial centers, wall signs for building or major tenant identification § 17.59.100(D) .
Key numeric standards (selected): industrial center freestanding identification sign: 10 sq ft per acre but no sign may exceed 50 sq ft (unless approved by a use permit); freestanding height 4 ft; wall sign formula: 0.25 sq ft per linear foot of business frontage or 25 sq ft, whichever is less § 17.59.100(D) .
Where it applies: industrial parcels and centers; industrial or commercial parcels 5+ acres require master sign program § 17.59.120(B)(4) .

Key standards & common limits (decision table)

Issue / permitted use	Typical limit / rule (plain)	Code reference
Community freestanding sign (residential developments)	20 sq ft max area; 4 ft max height	§ 17.59.100(A)
Single commercial freestanding sign (in lieu of wall)	24 sq ft max area; 6 ft max height	§ 17.59.100
Wall sign — retail/office	0.5 sq ft per linear ft of frontage or 20 sq ft (greater); cannot exceed 50 sq ft or 15% of building face	§ 17.59.100
Projecting signs (tenant id)	5 sq ft max; clearance 14 ft with 8 ft minimum pedestrian clearance; max 4 ft projection	§ 17.59.100
Window signs	Aggregate window signage up to 40% of individual window area; illuminated window sign limited to 10% of total storefront glass or 3 sq ft, whichever less; only one illuminated window sign per store	§ 17.59.100
Industrial center freestanding sign	10 sq ft per acre up to 50 sq ft; height 4 ft (unless sign use permit)	§ 17.59.100(D)
Public convenience signs (parking, exit, address)	May be any size/number as reasonably necessary; ≤ 20 sq ft and non‑illuminated can be approved by Community Development Director; larger or illuminated need Planning Commission	§ 17.59.090
Master sign program required	Retail centers 5+ tenants; residential 50+ units; centers 5+ acres; religious/private schools/hospitals etc.	§ 17.59.120(B)
Prohibited sign types (select)	Roof signs, billboards, portable/mobile billboards for hire, animated/flashing signs, reflective/day‑glow materials, signs on trees or public utility poles	§ 17.59.070

Permit process highlights

A sign permit is required unless the sign is explicitly exempt; submit plans, site plan, elevations, dimensions, materials, methods of illumination and pay fees § 17.59.040 .
Approving authority varies: Community Development Director handles administrative sign permits; Planning Commission reviews sign use permits and master sign programs; the Director may administratively approve minor modifications § 17.59.040 and § 17.59.120 .
No building permit will be issued until required design review is granted if design review applies § 17.59.040(C)(2) and see Title 17 design review rules § 17.58.050 .
After approval, the applicant must obtain a building permit for the sign (see administrative steps in § 17.59.040(C)(6)) .

Checklist

Confirm zoning for the parcel on the Foster City Zoning map and determine which sign-table applies. Verify with the Community Development Director if uncertain (verify parcel specifics). § 17.59.020
Determine whether sign is exempt per § 17.59.060 (exempt signs are listed in that section). Not all temporary or event signage is exempt — check the code. § 17.59.060
Prepare sign permit packet: site plan, building/frontage dimensions, elevations, sign elevations (materials, illumination method), installation detail § 17.59.040
If the project triggers design requirements or is part of a larger development, prepare materials for design review and a master sign program if required § 17.59.120
Check if the sign projects into the public right-of-way (projecting signs require encroachment permit and minimum clearances) § 17.59.100 (projecting signs)
If contemplating illumination, confirm permitted illumination types (external spot/halo allowed; backlit/backlit box and neon tubes restrictions) and verify light trespass limits in the applicable development standards § 17.59.070 / related lighting rules
If requesting area/height beyond the table limits, prepare a sign use permit or variance application with findings per § 17.59.040(B)(2) and variance criteria § 17.59.040(B)(2)(c)

Risks & Ambiguities

Issue	Why it matters	What to verify
Which zone label applies to a parcel (R‑1, C‑2, etc.)	Chapter 17.59 applies by use-category; the numeric table you use depends on the parcel’s zoning/land use designation	Confirm parcel zoning on the Foster City Zoning map and ask the Community Development Director to confirm which table applies. § 17.59.020
Measurement method for wall/window area (affected wall / aggregate glass)	Sign area limits reference specific measurement definitions; mis-measuring can cause denial	Use the definitions in § 17.59.030 for "affected wall surface area" and "aggregate total glass surface area" to calculate permitted area
When design review is required	Permit won't be issued until design review is complete where applicable	Confirm with planning staff and review Title 17 design review rules § 17.58.050 and § 17.59.040(C)(2)
Illumination type allowed	Some illumination is expressly prohibited (e.g., exposed neon, backlit box signs) which affects artistic choices	Check § 17.59.070 prohibited list and the illuminated window sign limits in § 17.59.100
Encroachment into the public right-of-way (projecting signs)	Signs into the ROW need separate encroachment permission and clearance rules	Verify projecting sign limits, projection and clearances in § 17.59.100 (projecting signs) and contact the public works/engineering office.
Master sign program applicability / substitutions	Master sign programs can supersede standards; relying on table values may be incorrect for a program-approved site	If the site already has (or should have) a master sign program, permit and design rules may differ — see § 17.59.120(A–C)

Plain-English Summary

Foster City’s sign chapter (Title 17, Chapter 17.59) lets typical business and residential signs but tightly limits size, height, illumination, and placement to protect community character: small freestanding neighborhood signs, measured wall signs tied to frontage, strict rules for projecting and window signs, prohibited flashing/billboard-style signs, and a permit process that routes normal signs to the Community Development Director and larger or unusual programs through the Planning Commission — check the exact numeric tables and definitions in § 17.59.030 and § 17.59.100 before you build or replace a sign .

Source References

Foster City Municipal Code — Chapter 17.59 (Sign Control): table of contents and purpose, § 17.59.010–140
Sign permit procedures and application requirements, § 17.59.040
Definitions used for area/measurement (affected wall surface area, aggregate total glass surface area), § 17.59.030
Public convenience signs, and sign development standards tables (Residential, Commercial, Office, Industrial), § 17.59.090 and § 17.59.100
Prohibited signs and limitations (animated, billboard, roof signs, neon/backlit constraints), § 17.59.070
Master sign program rules and applicability, § 17.59.120
Construction, maintenance, enforcement and administrative review details, § 17.59.130–140 and related administration notes § 17.59.040

Sources

Retrieved passages

Foster City Zoning Code (Section 17.59.060.) High relevance
Foster City Zoning Code (§ 2) High relevance
Foster City Zoning Code High relevance
Foster City Zoning Code (chapter establishes) High relevance
Foster City Zoning Code High relevance
Foster City Zoning Code (section through) High relevance
Foster City Zoning Code (§ 2) High relevance
Foster City Zoning Code (Chapter 17.59) High relevance
Foster City Zoning Code High relevance

Cited sections

Official Foster City code library

Frequently asked questions

What kinds of signs are explicitly prohibited in Foster City?

Foster City’s sign chapter lists prohibited types including billboards, roof signs (with limited exceptions for tall office buildings), animated or flashing signs, reflective/day‑glow materials, signs affixed to trees/public utility poles, and mobile billboards for hire; see § 17.59.070 for the full prohibition list .

Do I need a sign permit to replace an existing tenant panel or change copy?

Yes — a sign permit is required for non‑exempt signs and for any construction or physical alteration; cleaning and normal maintenance are exceptions. Submit the permit application items listed in § 17.59.040 (site plan, elevations, dimensions, illumination method, fees) unless the sign is exempt per § 17.59.060 .

How does Foster City measure allowable wall sign area?

Use the definitions in § 17.59.030: "affected wall surface area" and "business frontage" control the denominator for wall sign percentages; numeric limits for wall signs are in § 17.59.100 (for example, retail/office wall signs are calculated at 0.5 sq ft per linear ft or a baseline square footage) .

Can a shopping center get larger or taller signs than the tables allow?

Yes — a master sign program or a sign use permit can allow extra area, number, or height, but it must be approved by the Planning Commission and meet findings in § 17.59.120 and § 17.59.040(B); the Commission may increase normally allowed sign area by up to 50% under a use permit in appropriate circumstances .

Are illuminated signs allowed?

Some illuminated signs are allowed but with limits: illuminated window signs are limited (see § 17.59.100 — 10% of the storefront glass or 3 sq ft max for illuminated window signage); neon with directly exposed tubing is generally restricted; external spotlight or halo illumination of dimensional letters is preferred and backlit boxes are prohibited in some design contexts § 17.59.070 and § 17.59.100 .

If my sign projects over the sidewalk, what rules apply?

Projecting signs have a maximum face area (generally 5 sq ft for tenant identification), a maximum projection (4 ft), and required clearances (e.g., 14 ft high with at least 8 ft pedestrian clearance); projections into public right-of-way also require an encroachment permit — see the projecting sign entries in § 17.59.100 .

Are temporary signs and banners allowed without a permit?

Some temporary signs are exempt, but not all. The code includes an exempt‑sign listing and separate temporary‑sign rules; small civic or public convenience signs may be administratively approved, but larger or illuminated temporary signs require Planning Commission approval — check § 17.59.060, § 17.59.080, and § 17.59.090 for the exact criteria .

Will sign approval trigger other reviews (design, building, encroachment)?

Yes. Design review is required where Title 17 design rules apply and the code states no building permit will issue until required design review is complete (§ 17.59.040(C)(2) and § 17.58.050). Building permits are required after sign permit issuance, and encroachment permits are needed for signs into the public right-of-way (projecting signs) .

Does the city allow off‑site advertising or billboards?

Off‑site signs that advertise activities or goods not available on the premises are prohibited except for limited off‑site real estate and construction signs described in the code. In short, general billboards and off‑premises advertising are not allowed § 17.59.070(P) .

My development has 60 residential units—do I need a master sign program?

Yes. Townhomes, condominiums, or mixed‑use residential developments of 50 or more units must submit a master sign program; see § 17.59.120(B)(1) for applicability and § 17.59.120(C) for review authority and findings .

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