Local zoning · Foster City

Foster City — Zoning

Zoning 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 how Foster City regulates land use and zoning under Title 17 of the Foster City Municipal Code. It explains the zoning map, the primary districts and combining/overlay districts, and the most decision-relevant standards (setbacks, density, height, permitted uses) with pointers to where the ordinance sets them out. Confirm parcel-specific rules with the City; this summary synthesizes the ordinance text but does not replace a formal code reading or staff check.

Key local framework (how to read the ordinance)

  • The official city Zoning Map is incorporated by reference and on file with the City Clerk; use it to determine the applicable district for a parcel (§ 17.08.010) .
  • The ordinance lists primary districts (residential, commercial, industrial, public, open space) and also allows combining districts such as PD (Planned Development) and combining overlays (§ 17.10.020) .
  • Many district chapters repeat a consistent structure: Permitted uses, Conditional uses, and Area/bulk/yard/height rules — consult the chapter for the district that applies to your site (examples below).

First occurrences of several procedural or technical topics are linked for quick reference: the citywide Foster City zoning & planning overview, Development Standards, parking, design review, Overlay Districts, ADUs, and the California Building Standards Code.

District-by-district breakdown

Note: each district subsection below states the chapter/section where the ordinance defines permitted and conditional uses and the key dimensional standards. Always verify your parcel’s zoning on the official zoning map and with staff.

R-T (Townhouse Residence) — R-T

  • Purpose & where it applies: Allows townhouse/attached one-family residential development under the R-T standards (Chapter 17.16) — see § 17.16.010 and related sections .
  • Typical permitted uses: One-family attached residential / townhouses, accessory uses, and related home occupations; other uses may require conditional permits (§ 17.16.020) .
  • Key dimensional standards (as applied in the ordinance): minimum building site width 20 ft, maximum permitted density 15 units/acre, minimum front yard 5 ft, side/rear setbacks vary with adjacency (see notes), maximum height 38 ft / 3 stories, maximum coverage 50%, minimum open green 30% — table labeled 17.16.045 provides these numeric standards (§ 17.16.045) .
  • Parking & design: Parking per Chapter 17.62; design review standards in Chapter 17.96 apply (§ 17.16.050, § 17.16.060) .

R-2 (Low-Medium Density Multiple-Family) — R-2

  • Where defined: Chapter 17.14 (see district table and limits) — consult the chapter for full use lists and standards (§ 17.14.*) .
  • Typical permitted uses: multiple dwelling types allowed subject to the permitted-use list in the chapter; accessory uses; home occupations (see chapter).
  • Key dimensional standards (area/bulk summary from the ordinance table): minimum width 40 ft, minimum lot area 5,000 sq ft, density ~13 units/acre, front setback 20 ft, side 5 ft, rear 20 ft, max stories 2, max height 25 ft, max coverage 50% (see Chapter 17.14 tables) — consult § 17.14.040 for the area/bulk table (refer to the ordinance) .
  • Parking & design: Parking provided per Chapter 17.62; design review standards apply (§ 17.14.050, § 17.14.060) .

R-3 (Medium-Density Multiple-Family) — R-3

  • Where defined: Chapter 17.18 — “specific regulations set forth in this chapter shall apply in all R-3 districts” (§ 17.18.010) .
  • Uses: Multiple-family dwellings, accessory uses related to multi-family, home occupations, community care facilities, and Accessory Dwelling Units (ADUs) in compliance with Chapter 17.78 (§ 17.18.020) .
  • Area/bulk: The ordinance supplies a tabulated set of area/bulk/height rules for R-3 in § 17.18.040 (see chapter for numeric limits) .
  • Parking & design: Parking per Chapter 17.62; design standards per Chapter 17.96 (§ 17.18.050, § 17.18.060) .

R-4 (High-Density Multiple-Family) — R-4

  • Where defined: Chapter 17.20 sets R-4 rules and tables; density ranges and setbacks are set out in the chapter (§ 17.20.010 et seq.) .
  • Uses: High-density residential uses; see chapter for permitted vs. conditional lists.
  • Area/bulk: Chapter includes a numeric table (front/side/rear setbacks, heights up to 8 stories / 90 ft in the table heading examples for some commercial/residential mixes) — consult § 17.20.040 (table) for exact parcel-specific numbers .
  • Parking & design: Parking per Chapter 17.62; residential design standards in Chapter 17.96 apply (§ 17.20.050, § 17.20.060) .

C-1 (Neighborhood Commercial) — C-1

  • Where defined: Chapter 17.24. Purpose is neighborhood-scale commercial uses with close residential interfaces (§ 17.24.010–.060) .
  • Permitted uses: Retail/shops oriented to neighborhood needs; see full list in § 17.24.020. Some restrictions apply where C-1 abuts residential (minimum distance limits).
  • Area/bulk example: The ordinance table shows zero front/side/rear yard minimums for typical C-1 development but requires separation where it abuts residential (e.g., no building closer than 28 ft to residential) — see § 17.24.040 and associated notes .
  • Parking & enclosure: Parking rules per Chapter 17.62; non-parking commercial uses are generally required to be enclosed (§ 17.24.050, § 17.24.060) .

C-2 (General Business) — C-2

  • Where defined: Chapter 17.26; supports larger commercial development and mixed uses (§ 17.26.010–.070) .
  • Uses: Broader retail and service uses; the chapter includes specific permitted and conditional uses.
  • Area/bulk: Table in Chapter 17.26 shows minimum building site sizes, allowed heights (example table shows up to 8 stories / 90 ft in the table template for mixed developments) and special adjacency rules where commercial abuts residential (§ 17.26.040 table) .
  • Parking & enclosure: Parking and loading per Chapter 17.62; many non-parking uses must be within enclosed buildings (§ 17.26.050, § 17.26.060) .

C-M (Commercial Mix) — C-M

  • Where defined: Chapter 17.28; intended for mixed commercial/residential where combined zone rules apply (§ 17.28.010–.060) .
  • Uses & density: Permitted uses include mix of commercial and residential; density ranges for condominium vs. apartment uses are specified in the chapter table (e.g., 15–35 units/acre for condominiums) (§ 17.28.030, table) .
  • Parking & design: Parking per Chapter 17.62; residential design standards per Chapter 17.96 (§ 17.28.050, § 17.28.060) .

C-A (Commercial Automobile Repair & Service) — C-A

  • Where defined: Chapter 17.29; intended for automotive repair/service uses, with specific controls for operations and enclosure requirements (§ 17.29.010–.070) .
  • Uses: Vehicle service, some accessory retail when regulated (see chapter). Area/bulk and parking rules in the chapter apply.

M-1 (Light Manufacturing) — M-1

  • Where defined: Listed in the general district list (§ 17.10.010) along with other districts; consult Chapter 17.30 for specifics (search the code for Chapter 17.30) .
  • Uses: Light manufacturing, industrial-compatible activities; conditional use controls commonly apply.

PF (Public Facilities) — PF

  • Where defined: Chapter 17.32. Permits public buildings and facilities, schools, utility uses and certain housing types per the chapter (§ 17.32.020–.050) .
  • Special rules: Minimum 15% landscape area per lot in PF and yard/setback rules default to the most restrictive abutting district (§ 17.32.050) .

OSC (Open Space – Conservation) — OSC

  • Where defined: Chapter 17.34. OSC prohibits creation of buildable fill in marsh/water areas and delegates area/bulk rules to the use permit for structures in OSC (§ 17.34.040–.060) .

PD (Planned Development) — PD (Combining District)

  • Purpose & flexibility: The PD combining district permits flexibility to accommodate single-family developments, multiple housing, shopping centers, professional areas, industrial parks and combinations; it allows planning commission to waive many standard numeric requirements (yards, heights, coverage) when a General Development Plan is approved (§ 17.36.010–.020) .
  • Process: Establishment/removal is by application or city action under Chapter 17.74; PD approvals include a graphic General Development Plan that becomes part of the zoning map if adopted (§ 17.36.020, § 17.36.030) .
  • Note: Off-street parking requirements are not waivable in a PD except as expressly provided (see § 17.36.020(B)(9) and § 17.36.060) .

Senior Housing Overlay — Senior Housing Overlay (SHO)

  • Where defined: Chapter 17.37 establishes the Senior Housing Overlay District, with purpose, housing goals and development incentives. See § 17.37.010 for purpose and implementation framework .

Quick standards table (decision-relevant snippet)

District Typical permitted use(s) Representative dimensional highlights Code Reference
R-T Townhouses / attached 1-family Min width 20 ft; density 15 u/ac; front 5 ft; max height 38 ft / 3 stories § 17.16.045
R-2 Multi-family (lower density) Min lot 5,000 sq ft; front 20 ft; side 5 ft; max height 25 ft § 17.14.040 (area/bulk table)
R-3 Medium-density multi-family Multiple-family dwellings; ADUs allowed per city ADU chapter § 17.18.020 (uses); § 17.18.040 (area/bulk)
C-1 Neighborhood retail/services Zero lot yards often allowed; must separate from residential (e.g., 28 ft rule in note) § 17.24.040
C-2 General business / mixed uses Larger sites; adjacency rule: commercial not closer than 20 ft to R-1 in some cases § 17.26.040 table notes
PD Mixed uses per approved plan Standards may be waived by PC; PD requires general/specific development plans § 17.36.020–.030

(These are representative slices — consult the full chapter tables for precise numeric rules for a specific parcel and note that Chapter 17.62 controls parking requirements across districts.)

Checklist

  • Confirm the parcel zoning on the official Zoning Map (§ 17.08.010) and note any combining or overlay districts that apply .
  • Read the full district chapter for allowed uses and conditional uses (e.g., Chapter 17.16 for R-T, Chapter 17.18 for R-3) and identify whether your proposed use is permitted by right or needs a conditional use permit (§ 17.16.020, § 17.18.020) .
  • Check area/bulk/setback/height and coverage numbers in the district table (e.g., § 17.16.045, § 17.14.040, § 17.18.040) and confirm lot-specific applicability .
  • Determine parking requirements from Chapter 17.62 as required by your district chapters (many chapters specify “Parking shall be provided in accordance with Chapter 17.62”) and plan accordingly; consult the city parking guide parking and § references in district chapters .
  • Check whether your project requires design review or architectural review findings; see the findings required in § 17.58.050 .
  • If located in or near an overlay (for example the Senior Housing Overlay), review the special overlay chapter (e.g., Chapter 17.37) for incentives or additional requirements .
  • For ADUs, consult Chapter 17.78 and the cross-references in residential chapters (e.g., § 17.18.020 for R-3) and state ADU law links such as California ADU law .
  • For any requested deviations (setback reductions, encroachments, variances), consult the variance procedures and use-permit standards (e.g., Chapters 17.06, 17.72, 17.74) and consider obtaining pre-application advice from Community Development — Verify with the jurisdiction.

Risks & Ambiguities

Issue Why it matters What to verify
Zoning map boundary interpretation The map is incorporated by reference and small boundary differences control which chapter applies (§ 17.08.010) Confirm the parcel’s official map designation with the City Clerk/planning staff; request an official map determination (§ 17.08.010)
Combining districts / PD conditions PD can waive many numeric standards; whether your lot is in a PD changes the applicable rules (§ 17.36.020) If in a PD, obtain the approved General Development Plan and PD conditions; PD can supersede standard chapters — Verify with the jurisdiction (§ 17.36.030)
ADU technical applicability Residential chapters reference ADUs but City ADU chapter controls details (state law overlays city rules) — see § 17.18.020 and Chapter 17.78 Confirm ADU standards in Chapter 17.78 and whether state ADU law changes apply; verify permitted ADU count on institutional lots (PF special rules)
Parking calculation differences District chapters routinely defer to Chapter 17.62 for parking; parking demand can materially affect project feasibility Confirm parking ratios, compact/covered rules, and whether shared or off-site parking is allowed (Chapter 17.62) — Verify with planning staff
Design review triggers Many districts require design compliance and findings under Chapter 17.58; private architectural controls can add requirements (§ 17.58.050–.070) Verify whether your project requires architectural review, which body makes findings, and if private HOA/deed restrictions require parallel review

Plain-English Summary

Foster City’s Title 17 divides the city into named zoning districts (e.g., R-T, R-2, R-3, R-4, C-1, C-2, C-M, PD, PF, OSC) that specify what you can build and the numeric rules (setbacks, height, lot coverage, density). The official Zoning Map controls which chapter applies to a parcel (§ 17.08.010); most chapters then defer to citywide rules for parking (Chapter 17.62) and design review (Chapter 17.58) — verify parcel-specific details with City staff before designing a project .

Source References

  • Zoning Map and district boundaries: § 17.08.010
  • District listings, combining districts: § 17.10.020
  • R-T district: § 17.16.010, § 17.16.020, § 17.16.045, § 17.16.050, § 17.16.060
  • R-2 district (tables & parking): Chapter 17.14 (area/bulk table references) and § 17.14.050–.060 for parking/design
  • R-3 district: § 17.18.010–.060 (uses, area/bulk, parking, design)
  • R-4 district: § 17.20.010–.060 (tables and design references)
  • C-O district: § 17.22.010–.030 (permitted/conditional uses)
  • C-1 district area/bulk table: § 17.24.040–.060
  • C-2 district table & notes: § 17.26.040–.060
  • C-M district (mix) and density notes: § 17.28.010–.060
  • C-A (automotive): § 17.29.010–.070
  • PF (Public Facilities): § 17.32.020–.050 (uses and lot landscaping rules)
  • OSC (Open Space-Conservation): § 17.34.040–.060
  • PD (Planned Development combining district): § 17.36.010–.140 (purpose, establishment, plan, waivers)
  • Senior Housing Overlay: § 17.37.010 et seq.
  • Design/architectural review findings: § 17.58.050–.070
  • ADUs referenced in residential chapters and handled in Chapter 17.78 (see R-3 reference § 17.18.020)

If you need parcel-specific checks (exact setbacks, driveway/garage location rules, or whether a PD/GDP modifies the standard limits), request the parcel's zoning map printout and applicable PD/general development plan from Foster City Community Development. Verify any state-law preemptions (e.g., ADU law) as they interact with local text; if you want, I can prepare a short checklist of city staff contacts and the exact documents to request.

Sources

Retrieved passages

  • Foster City Zoning Code (Chapter 17.36) High relevance
  • Foster City Zoning Code (Chapter 17.74) High relevance
  • Foster City Zoning Code (§ 1) High relevance
  • Foster City Zoning Code (§ 2) High relevance
  • Foster City Zoning Code (§ 1) High relevance
  • Foster City Zoning Code (§ 1) High relevance
  • Foster City Zoning Code (chapter is) High relevance
  • Foster City Zoning Code (§ 2) High relevance

Cited sections

Frequently asked questions

What can I build on an R-1 lot in Foster City?

The full R-1 rules were not surfaced in the returned excerpts; district regulations are found in Title 17 under the R-1 chapter. Confirm the R-1 chapter and its area/bulk table on the official zoning map and City code; if you want, I will pull the R-1 chapter text for you. Verify with the jurisdiction.

What are Foster City setback requirements for townhouses (R-T)?

Representative R-T setbacks in the ordinance’s area/bulk table are a 5 ft front yard and side/rear setbacks that depend on adjacency; the R-T table is at § 17.16.045 (minimum building width 20 ft, max height 38 ft / 3 stories) . Always confirm the exact numbers for your lot in Chapter 17.16 and with staff.

Do I need design review in Foster City?

Design/architectural review findings must be made for projects subject to architectural review under Chapter 17.58; Section § 17.58.050 lists required findings and that designs must conform to the General Plan and Title 17 standards . Check whether your district chapter or project type triggers architectural review.

Where is the official Foster City zoning map and how binding is it?

The Zoning Map is incorporated by reference and is on file in the City Clerk’s office; it controls district boundaries and is binding for determining applicable Title 17 chapters (§ 17.08.010) . For parcel disputes, obtain a formal map determination from the city.

Are ADUs allowed in multi-family zones in Foster City?

Yes — the R-3 chapter expressly includes Accessory Dwelling Units in compliance with the city ADU chapter (Chapter 17.78) as a permitted accessory use (§ 17.18.020) . Consult Chapter 17.78 for objective ADU standards and state ADU law for preemptive rules.

Can a PD district change standard setbacks or heights?

Yes. The PD combining district allows the Planning Commission to waive many standard numeric rules (minimum site, yards, heights, coverage, etc.) when approving a PD, but off-street parking requirements remain subject to special rules in the PD chapter (§ 17.36.020(B) and § 17.36.060) . Review the PD’s adopted General Development Plan to see which standards have been modified.

Where do I find Foster City parking requirements that apply to a proposal?

District chapters routinely defer to Chapter 17.62 for parking; check the applicable district chapter (e.g., § 17.16.050, § 17.18.050) which state “Parking shall be provided in accordance with Chapter 17.62” and then use Chapter 17.62 for the parking counts and standards .

Is commercial cannabis allowed anywhere in Foster City?

No. The code prohibits commercial cannabis activity in all zoning districts; limited exceptions are handled by specific chapters for testing laboratories if applicable (§ 17.11.010) .

If my lot abuts a residential zone, will commercial setbacks increase?

Yes — multiple district tables include adjacency rules that increase side or building setbacks where a commercial zone abuts R-1 or R-1/PD; for example, certain chapters require increased side setbacks of 10 ft or minimum distances such as 20–28 ft where commercial abuts residential (see C-1/C-2 notes in § 17.24.040, § 17.26.040) .

How do I start if I want to rezone or establish a PD on my property?

A PD is established or removed by application and processed under Chapter 17.74; a General Development Plan is required and the planning commission/city council approval steps and submittal requirements are in § 17.36.020–.040 and related procedural chapters (Chapter 17.74 / Chapter 17.06 references) .

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