Suisun City Zoning, Planning & Building Codes

Last reviewed: July 3, 2026

Overview

Suisun City’s zoning and land‑use regulations are codified in the municipal zoning title adopted as a city zoning plan; the ordinance is organized under Title 18 (zoning) and begins with the city’s purpose and authority at § 18.02.010 and § 18.02.020. The city’s map and district list (Table 18.06.01) establish the actual zoning districts and where each district’s text and standards are located in Title 18 (§ 18.06.010; § 18.06.020). Suisun City pairs that district framework with chapter‑level development standards (residential and civic tables), site plan / architectural review rules, and special‑plan chapters (notably the Waterfront District Specific Plan) that together control permitted uses, setbacks, height and parking.

How Suisun City's code is organized

• The zoning title is enacted as a city zoning plan and states purpose/authority in § 18.02.010 and § 18.02.020.
• Districts are established in the Districts chapter and adopted map at § 18.06.010 and § 18.06.020 (Table 18.06.01 is the master district list).
• Development standards (setbacks, lot coverage, maximum heights, minimum lot sizes) for residential districts live in the residential standards chapter and table at § 18.31.005 / Table 18.31.01.
• Civic/park/other district standards are in § 18.33.010 / Table 18.33.01.
• Use permissions and the tables showing by‑district permitted, conditional, or prohibited uses are located in each zone chapter (see each zone’s Allowable Uses tables; e.g., the residential and commercial use tables in Chapter 18.08 and Chapter 18.20).
• Project‑level procedures (site plan & architectural review, ARB, PUD, conditional use, appeals) are in Chapters 18.76, 18.78, 18.72 and related administrative chapters (e.g., appeals Chapter 18.84).

(If you want to jump to the city’s district definitions, see the Suisun City Zoning page.) [/us/california/suisun-city/zoning]

Zoning district families

Table 18.06.01 groups Suisun’s districts; list pulled directly from the code at § 18.06.010.

• Residential family: RL (Low‑Density Residential), RM (Medium‑Density Residential), RH1 (High‑Density Residential 1), RH2 (High‑Density Residential 2), RMU (Residential Mixed‑Use). § 18.06.010.
• Commercial / Retail / Office family: CR (Commercial Retail), CSF (Commercial Services & Fabricating), CMU (Commercial Mixed‑Use), O (Business & Professional Office). § 18.06.010.
• Parks / Public / Other: APS (Agricultural Production & Sales), OS (Open Space), P (Park), PQP (Public/Quasi‑Public), PUD (Planned Unit Development), and the Waterfront Specific Plan DWSP. § 18.06.010.

Each district chapter describes allowed uses, numeric density/FAR ranges (see the “Densities and Intensities” tables), and references the development standards table that applies to that family (§ 18.08.060 for residential densities; Table 18.28.01 for civic zones).

Citywide development standards (high‑level)

Suisun’s code centralizes numerical development limits in zone development tables and explanatory notes rather than scattering standards across many chapters.

• Lot size, coverage and setbacks. The residential standards table Table 18.31.01 specifies minimum lot area (e.g., RL: 3,600 sf, RM: 1,800 sf, RH1: 1,200 sf, RH2: 800 sf, RMU: 800 sf), maximum lot coverage (RL: 40%, others commonly 80%), and front/side/rear setback ranges (front: 10 ft min – 20 ft max in many residential zones; 0–15 ft ranges for higher‑intensity zones). These numeric standards are at § 18.31.005 / Table 18.31.01.
• Height. The same table sets maximum heights by zone (examples: RL and RM max 35 ft, RH1/RH2/RMU max up to 55 ft), with conditional procedures for exceeding heights (see Table notes and zone language). § 18.31.005 / Table 18.31.01.
• FAR / densities for mixed and civic zones. Civic and mixed zones list FAR ranges and du/acre ranges in Tables 18.28.01 and 18.08.01 (e.g., RMU: 10–45 du/ac and 0.3–1.0 FAR). § 18.28.060; § 18.08.060.
• Parking and loading are governed by a dedicated chapter (referenced as Chapter 18.42 in the development tables); the tables point project applicants to Chapter 18.42 for numerical parking requirements and loading rules. § 18.31.005 (table notes) / see Chapter 18.42. (See the Suisun City Parking page for a practical summary.) [/us/california/suisun-city/parking]
• Landscaping, fences, signs and stormwater are referenced to other chapters and city standards (examples: water‑efficient landscaping references Title 20; fences to Chapter 18.34; signs to Chapter 18.44). § 18.31.005 and accompanying table notes.

For a focused read on the code’s numeric controls, jump to the Suisun City Development Standards page. [/us/california/suisun-city/development-standards]

Design rules, discretionary review, and architectural control

• Site plan and architectural review: projects required to undergo site plan & architectural review must submit that application before applying for a building permit; the application contents and review criteria are spelled out in § 18.76.030 and § 18.76.040, and the director (or planning commission for major projects) has the review/approval authority per § 18.76.050. (See the Suisun City Design Review page for workflow details.) [/us/california/suisun-city/design-review]
• Waterfront District ARB: the Planning Commission serves as the Architectural Review Board for the Waterfront District Specific Plan and is charged with implementing the DWSP aesthetics and historic preservation goals; see § 18.78.010 and § 18.78.020. (There is a specific Design/ARB process for the DWSP area.) [/us/california/suisun-city/historic-preservation]
• PUD and discretionary entitlements: Planned Unit Development permits and their multi‑step review, hearing and appeal process are in Chapter 18.72 (application, preliminary and precise plans, hearings before the planning commission and city council, appeals). § 18.72.010 – § 18.72.090.

If you need the city’s site plan checklist or to confirm whether your project is “major” (and therefore requires planning‑commission review), see the Site Plan chapter and the “major site plan” thresholds at § 18.76.050.

Specific plans & overlays

• The municipal code lists a dedicated specific‑plan zoning area: DWSP (the Waterfront District Specific Plan) in Table 18.06.01 and implements design/historic review and goals for that area in Chapter 18.78. § 18.06.010; § 18.78.010. (For quick reference, see Suisun City Overlay Districts.) [/us/california/suisun-city/overlay-districts]
• PUDs function like floating, plan‑level overlays: PUD permits can be applied in any zone (subject to the PUD chapter process) and provide a flexible approach to site and design standards when a unified plan is adopted for a site. § 18.72.020 – § 18.72.080.

The code also contains local historic preservation and ARB duties tied to the DWSP area (Chapter 18.78), which functions as the principal area‑specific overlay for waterfront historic and design controls. § 18.78.010 – § 18.78.020.

Building permits & the approval path (practical orientation)

• Pre‑application: large or discretionary projects are expected to use the city’s preapplication process; requirements and the deposit rule are summarized in § 18.65.030 – § 18.65.040.
• Site plan & architectural review is explicitly required before submitting for a building permit where the code states the site plan & architectural review application must be filed “prior to the submittal of an application for issuance of a building permit” (see § 18.76.030).
• Administrative timelines and review authorities: the development services director reviews ministerial and many administrative matters and must act within timelines (30 days for certain determinations per § 18.76.050), while major projects go to the planning commission and can be appealed to the city council per the appeals chapter. § 18.76.050; Chapter 18.84.
• PUD / legislative entitlements: PUD applications require preliminary and precise plans, environmental documentation, hearings before the planning commission and possibly the city council, and are governed by the procedural rules in Chapter 18.72 (e.g., completeness, public hearing and timing rules at § 18.72.050 – § 18.72.080).

Note: the municipal code cross‑references other city standards (engineering, landscaping, water‑efficient landscaping in Title 20, etc.) so expect parallel plan submissions (public works, utilities, landscape). § 18.31.005 table notes; see Title 20. (For building‑code compliance, follow the California Building Standards Code / Title 24.) [/us/california/building-codes]

State housing law in Suisun City

Suisun’s zoning title incorporates and implements state housing laws in targeted ways; below are the city code sections that explicitly address SB 9, accessory dwellings, density/streamlining, and the city’s procedures that interact with state law.

Accessory dwelling units (ADUs / JADUs)

• Local ADU numeric / setback rules are captured in the residential standards table where ADU minimum side and rear setbacks are set at 4 ft (see the ADU rows and notes in Table 18.31.01 / § 18.31.005).
• The code also incorporates specific ADU provisions and references state law updates in table notes and cross references (see notes referencing § 18.30.170 and ordinance updates adopting state ADU amendments). § 18.31.005 table notes; the code was amended to reflect state ADU reforms by ordinance updates (see notes summarizing Ord. Nos. 774 and 809). (For a plain‑English summary of the state ADU rules that affect Suisun’s local ADU process, see California ADU law.) [/us/california/california-adu-laws]
• Practically: Suisun’s table establishes that ADU setbacks of 4 ft and specific height limitations for detached/attached ADUs apply locally consistent with state standards; see § 18.31.005 and the table notes for conversion/replacement and internal ADU guidance.

SB 9 urban lot splits and ministerial two‑unit projects

• Suisun adopted a local SB 9 implementation in § 18.08.090. That section requires ministerial approval by the development services director within 60 days of a complete application if the project meets the local SB 9 criteria (for example, the parcel must be in RL or RM, new parcels must be at least 1,200 sf, side/rear setbacks no less than 4 ft, and one off‑street parking space unless a transit proximity exception applies). § 18.08.090.

Density bonus, streamlining and preapplication for housing

• The preapplication and streamlining chapter explicitly provides a preapplication path for projects that seek density bonus incentives or are subject to state streamlining (see § 18.65.040 – § 18.65.050). The city requires preapplication for projects requesting a density bonus except where specified otherwise. § 18.65.040 – § 18.65.050.

Rent control / eviction limits

• No provisions establishing local rent control or local tenant eviction limits were located in the retrieved zoning title excerpts; this topic is Not found in retrieved materials and should be verified with the City’s municipal code outside Title 18 or with the city attorney. Not found in retrieved materials.

(For a consolidated read on how California housing laws affect local rules in Suisun, see the California housing laws overview.) [/us/california/housing-laws]

Information gaps / verify with the city

• The excerpts provided are comprehensive for Title 18 but do not include the full text of some referenced chapters (for example, the full Chapter 18.42 parking schedules and Chapter 18.44 signage detail were referenced by the development tables but the numeric parking table itself was not included in the retrieved snippets). Verify numeric parking rates and loading rules by consulting Chapter 18.42 in the full code.
• The city’s building‑permit routing practices and any fee schedule or master checklist (fees and exact turnaround time expectations) are administered by Development Services and summarized in the preapplication and PUD chapters, but the operative fee amounts are in the master fee schedule (not in these Title 18 excerpts). See § 18.65.030 – § 18.65.040 for the preapplication deposit rule and § 18.76.050 for review timelines; check the city’s published fee schedule for exact fees.

Source References

• Suisun City Zoning Code (Title 18) — adoption, purpose, districts: § 18.02.010; § 18.02.020; § 18.06.010; § 18.06.020.
• Residential development standards / ADU notes: Table 18.31.01 / § 18.31.005.
• Civic / park standards and Table 18.33.01: § 18.33.010.
• Densities and intensities tables (civic / residential): § 18.28.060; § 18.08.060; Table 18.28.01.
• Site plan & architectural review procedures and criteria: § 18.76.030; § 18.76.040; § 18.76.050.
• Architectural Review Board / Waterfront District Specific Plan implementation: § 18.78.010; § 18.78.020.
• Planned Unit Development permit procedures: Chapter 18.72 (see § 18.72.010 – § 18.72.090).
• SB 9 (urban lot split) local rules: § 18.08.090.
• Code notes and ordinance update history (ord. nos. and amendment notes): Title 18 editorial/notes.

(Quick links on GoCodebook for practical pages mentioned above: Suisun City Zoning; Suisun City Land Use; Suisun City Development Standards; Suisun City Parking; Suisun City Design Review; Suisun City Overlay Districts; Suisun City ADUs; California Building Standards Code.)

• Suisun City Zoning: /us/california/suisun-city/zoning
• Suisun City Land Use: /us/california/suisun-city/land-use
• Suisun City Development Standards: /us/california/suisun-city/development-standards
• Suisun City Parking: /us/california/suisun-city/parking
• Suisun City Design Review: /us/california/suisun-city/design-review
• Suisun City Overlay Districts: /us/california/suisun-city/overlay-districts
• Suisun City ADUs: /us/california/suisun-city/adu
• California Building Standards Code: /us/california/building-codes