Foster City Zoning, Planning & Building Codes

Last reviewed: July 3, 2026

Overview

Foster City’s land-use controls are codified in Title 17 (Zoning) of the Foster City Municipal Code. The Title organizes the city into a set of base zoning districts (residential, commercial, industrial, public/open space), several combining/overlay districts, and standalone chapters for cross-cutting rules: parking, design standards, accessory dwelling units (ADUs), two‑unit/urban lot split (SB 9) rules, and special-purpose chapters (e.g., emergency shelters). The code places most district-specific area/bulk/yard rules inside each district chapter (e.g., § 17.16.045, § 17.18.040) while citywide standards and procedures live in dedicated chapters such as Chapter 17.62 (parking) and Chapter 17.96 (design & objective standards).

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How Foster City's code is organized

• Title and chapters: the zoning rules appear in Title 17 and are broken into chapters for general rules, district chapters, and topical chapters (e.g., PD combining district, ADUs, parking, design review). See the directory language at § 17.10.030 and the district list at § 17.10.020.
• District chapters: each zoning district gets its own chapter (for example, townhouse R-T in Chapter 17.16, medium‑density R‑3 in Chapter 17.18, high‑density R‑4 in Chapter 17.20, and commercial chapters such as C‑2 in Chapter 17.26) where the code lists permitted/conditional uses and the area/bulk/yard tables (for example § 17.16.045, § 17.18.040, § 17.20.040, § 17.26. chapters).
• Combining/overlay and special districts: combining districts such as PD (Planned Development), X (Future Development), and W (Aquatic Development) are declared in § 17.10.020 and implemented in their own chapters (notably Chapter 17.36 PD). Special overlays such as the Senior Housing Overlay appear as distinct chapters (see Chapter 17.37).
• Cross-cutting topical chapters: look to the dedicated chapters for citywide rules—parking (referenced throughout; see cross‑references to Chapter 17.62 in district chapters), design & objective standards (Chapter 17.96), architectural/design review (Chapter 17.58), ADUs (Chapter 17.78), and the SB 9 / two‑unit & urban lot split rules (Chapter 17.79). These chapters collect the rules that apply across districts rather than repeating them in every zone.

(Navigation tip: district-specific area/bulk/yards and permitted uses are in the district chapter; if a chapter text says “parking shall be provided in accordance with Chapter 17.62,” follow that cross-reference for parking rules rather than the district table.)

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Zoning district families

Foster City uses the following primary district families (names and chapter anchors listed in the code):

• Residential family

  • R‑1 (single‑family) — see district chapters beginning at 17.12 (general district framework referenced in § 17.10.020).
  • R‑T (townhouse / townhouse PD) — area/bulk standards at § 17.16.045 (minimum front yard 5 ft, max stories 3, max height 38 ft, max coverage 50%, min open/green 30%).
  • R‑3 (medium‑density multi‑family) — permitted uses and area/bulk rules in Chapter 17.18 (see § 17.18.020 and § 17.18.040 for densities and setbacks).
  • R‑4 (high‑density multi‑family) — Chapter 17.20 (see § 17.20.040 for area/bulk and § 17.20.050 referencing parking rules).

• Commercial family

  • C‑O (commercial office), C‑2 (general commercial), C‑M (commercial mix), C‑A (automotive repair) — each has its own chapter with use lists and area/bulk limits (e.g., Chapter 17.22, Chapter 17.26, Chapter 17.28, Chapter 17.29). Where commercial abuts residential the code often mandates larger buffer setbacks (see § 17.26. and § 17.28. notes about 20–25 ft buffers).

• Industrial / other

  • M‑1 (light manufacturing), PF (public facilities), and OSC (open space‑conservation) are listed among the primary districts in § 17.10.020 and have chapters that set permitted uses and special standards (e.g., Chapter 17.32 PF permits public services, emergency shelters and housing consistent with state law at § 17.32.020).

• Combining / overlay districts

  • PD (Planned Development) — flexible development rules and process in Chapter 17.36; PDs permit the city to waive many numeric standards (for example, minimum lot dimension, yards, height) upon approval of a general development plan (§ 17.36.020) and require a graphic general development plan (§ 17.36.030).
  • Senior Housing Overlay — Chapter 17.37 creates incentives and rules for senior housing projects.
  • Other combining zones listed in § 17.10.020 include X (future development) and W (aquatic development).

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Citywide development standards (high‑level)

Foster City separates district numeric tables from citywide technical chapters. Key cross‑references and the usual locations for standards are:

• Setbacks, heights, FAR/coverage, densities: each district chapter contains the district’s area/bulk/yard table (for example § 17.16.045 for R‑T, § 17.18.040 for R‑3, § 17.20.040 for R‑4). Use those tables for the controlling numeric limits.

  • Example district numbers: R‑T tables show a 5 ft front setback, side setbacks 0/10 ft depending on abutting zone, max 3 stories/38 ft, and 50% maximum coverage (§ 17.16.045).
  • Where a commercial zone abuts residential the code routinely requires larger separation (e.g., 20–25 ft minimum building distance to residential in commercial chapters — see the notes in § 17.26 and § 17.28).

• Parking: district chapters defer to Chapter 17.62 for quantitative parking and loading standards; many district sections explicitly say “Parking shall be provided in accordance with Chapter 17.62” (see § 17.16.050, § 17.18.050, § 17.20.050, § 17.26.050). For accessory dwelling units, ADU parking rules are special and appear in § 17.78.080 (ADU parking caps and exceptions). If you’re checking required stall counts, follow Chapter 17.62 first, then ADU exceptions in Chapter 17.78.

  • Quick internal link: see the city’s parking guidance in the Foster City Parking page. (/us/california/foster-city/parking)

• Design, objective standards and architectural review: citywide objective design standards for multi‑family/mixed‑use projects are codified in Chapter 17.96, which is applied to most new/altered multifamily development and allows written exceptions in lieu of variances (see § 17.96.020 – 17.96.030). Architectural and design review procedures and what improvements require review are in Chapter 17.58 (see § 17.58.020 for items subject to architectural review). For project applicants this is where façade, materials, and public‑facing design requirements live.

  • Quick internal link: read more about Foster City’s design review process on the Foster City Design Review page. (/us/california/foster-city/design-review)

• Landscaping, screening, signage, nonconforming rules, and variance procedures: the code contains separate chapters addressing these cross‑cutting topics (e.g., landscaping and screening references appear across district chapters and combining chapters; variance and other exception procedures are cross‑referenced in PD and design‑standards chapters). Where PDs are used, the PD chapter explains what standards can be waived (§ 17.36.020) and references the standard permit processes.

  • Quick internal links: Foster City Development Standards, Landscaping and Screening, Signage, Nonconforming Uses, and Variances and Exceptions pages are the natural next stops for these topics. (/us/california/foster-city/development-standards) (/us/california/foster-city/landscaping-and-screening) (/us/california/foster-city/signage) (/us/california/foster-city/nonconforming-uses) (/us/california/foster-city/variances-and-exceptions)

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Specific plans & overlays

• Planned Development (PD): Chapter 17.36 sets the PD combining district process and explains that a graphic general development plan is required and becomes part of the zoning record (see § 17.36.030, and the list of waivable numeric standards in § 17.36.020). PD approvals may include specific development plans and off‑street parking rules are handled via PD rules or Chapter 17.62.
• Senior Housing Overlay: Foster City has a Senior Housing Overlay (Chapter 17.37) with its own purposes, goals and incentives; developers should consult that chapter for bonus/incentive language and procedural requirements.
• Other overlays / combining: PD, W (aquatic), and X (future development) are noted in § 17.10.020; other overlay language is embedded throughout Title 17 where district‑specific combining rules apply.

(Quick internal link: the Foster City Overlay Districts page maps how overlays modify base zones.) (/us/california/foster-city/overlay-districts)

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Building permits & review — practical path

• Which approvals are ministerial vs discretionary:

  • ADUs/JADUs are processed ministerially if they meet the stated objective standards: Chapter 17.78 sets ADU standards and requires ministerial approval timelines (applicant receives approval within 60 days if application is complete) (§ 17.78.020, § 17.78.090).
    • Quick internal link: see Foster City ADUs for procedure and checklist. (/us/california/foster-city/adu)
  • Supportive housing and low‑barrier navigation centers are addressed in Chapter 17.82 and the code directs ministerial or streamlined treatment consistent with state law, with timing rules for completeness and action (e.g., 60 or 120 day timeframes depending on project size) (§ 17.82.020 – 17.82.030).
  • SB 9 (two‑unit/urban lot split) projects under Chapter 17.79 are governed by objective standards and an objective approval process; the chapter explicitly implements Government Code Sections 65852.21 and 66411.7 and is applicable in single‑family zones (R‑1 and R‑1/PD) with detailed numeric and procedural limits. See § 17.79.010 – 17.79.060.

• Typical permit sequence for a discretionary project:

  1. Pre‑application / intake with Community Development. 2. Application package including site plans, elevations, and (for PDs) a graphic general development plan per § 17.36.030. 3. Staff review against district standards, Chapter 17.96 design standards (if applicable), and Chapter 17.62 parking rules. 4. Discretionary hearing(s) (planning commission/city council) if a use permit, PD or rezoning is required; PD amendment and extension rules are in § 17.36.100 – 17.36.110. 5. Building permit review against the California Building Code (Title 24) and the city’s building official after planning approvals. The PD chapter describes procedural relationships with other chapters when approvals are combined.

• Architectural/design review: many exterior changes and new buildings require architectural (design) review under Chapter 17.58; see § 17.58.020 for the list of improvements subject to review (new buildings, exterior modifications, decks above grade, etc.).

• Building code interface: once planning approvals are granted, projects must comply with the California Building Standards Code (Title 24) during building permit review and inspections. Quick internal link to the state code page: California Building Standards Code. (/us/california/building-codes)

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State housing law in Foster City

Foster City’s Title 17 implements (and in some places defers to) California housing laws. The city’s zoning contains discrete chapters and adjustments to reflect state mandates:

• Accessory Dwelling Units (ADUs/JADUs): Foster City’s Chapter 17.78 aligns local ADU rules with state law, makes ADUs ministerial where they meet objective standards, limits ADU size and height (e.g., detached ADU size caps, 25 ft height limit), and caps ADU parking to one space per unit/bedroom with multiple statutory exceptions listed in § 17.78.060 – 17.78.090. The chapter explicitly states that the ADU ordinance is intended to permit ADUs consistent with state law.

  • Quick internal link: read Foster City ADU guidance here. (/us/california/foster-city/adu)
  • Also reference California ADU law for state rules and preemption. (/us/california/california-adu-laws)

• SB 9 / Two‑Unit & Urban Lot Splits: Foster City added Chapter 17.79 to implement state SB 9 provisions (objective two‑unit development and urban lot splits) within the single‑family zones (R‑1 and R‑1/PD). That chapter sets parcel size minimums, setback/height rules (SB 9 units limited to 25 ft and 2 stories), parking minimums (one off‑street space per SB 9 unit except where state exceptions apply), and ministerial timing/processing language; it also directs fee and impact‑fee treatment per Government Code. See § 17.79.010 – 17.79.070 for the local SB 9 program.

• Supportive housing / emergency shelters: Chapter 17.82 implements state mandates allowing emergency shelters and low‑barrier navigation centers and sets processing timelines and standards in line with state planning law (including ministerial/streamlined review for supportive housing in some cases). See § 17.82.020 – 17.82.030.

• Density bonus, rent control, other statewide housing programs: the code contains discrete references to state law where applicable (for example, Chapters that explicitly reference Government Code sections). For density bonus specifics and local implementation, consult the specific code chapter that governs a project’s type or the city’s housing element implementation programs — I did not find a single “density bonus” chapter in the excerpts retrieved; verify in the full Title 17 or city housing element for the local density bonus implementation. Not found in retrieved materials — verify with the jurisdiction.

  • Quick internal link for California housing law background: California housing laws page. (/us/california/housing-laws)

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Practical takeaways for applicants

• Start at the district chapter: find the project parcel’s zoning and read that district chapter’s permitted uses and the area/bulk table (e.g., § 17.16.045, § 17.18.040, § 17.20.040).
• Check Chapter 17.62 for parking ratios and Chapter 17.96 and Chapter 17.58 for design/architectural requirements; many district chapters cross‑reference these chapters directly (so you’ll need to comply with both the district table and these citywide chapters). (/us/california/foster-city/development-standards)
• ADUs and SB 9 projects have their own ministerial/ objective chapters (17.78 and 17.79) with timelines and explicit objective standards—use those chapters for fast‑track opportunities.
• If you want to change numeric standards across a larger site, consider a PD application (Chapter 17.36) which allows tailored general development plans and can waive certain numeric standards if approved.

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Information gaps / verification items

• The excerpts provided include the major chapters (Title 17) but do not show every procedural chapter in full (for example, the full text of Chapter 17.62 (parking), Chapter 17.72 (conditional uses), Chapter 17.06 (variances/permits) or a dedicated density‑bonus chapter were not present in the retrieved snippets). Where the overview above points to a chapter without a full excerpt, consult the full Foster City Municipal Code online or contact Community Development for the definitive text. Not found in retrieved materials — verify with the jurisdiction.

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Source References

• Foster City Municipal Code, Title 17 (Zoning) — district chapters and topical chapters cited throughout (examples: § 17.10.020, § 17.16.045, § 17.18.020/040, § 17.20.040, § 17.22, § 17.26, Chapter 17.36 PD, Chapter 17.37 (Senior Housing Overlay), Chapter 17.58 (architectural review), Chapter 17.78 (ADUs), Chapter 17.79 (two‑unit/SB 9), Chapter 17.96 (design standards), § 17.82.020–030)