Local zoning · Santa Rosa

Santa Rosa — Development Standards

Q: What can I build on an R-1 lot in Santa Rosa?

The Zoning Map assigns parcels to districts like R-1 (Single-Family Residential). A use must be listed as allowable for that district and obtain any required permit before construction; detailed use tables and permit levels are provided in Chapters 20-22 to 20-24 referenced by § 20-21.030 . Dimensional standards (setbacks/height/FAR) for R-1 are not in the source materials. Verify with the jurisdiction.

Development Standards under the Santa Rosa local zoning and planning code, with the controlling citations.

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Quick answer

In Santa Rosa, all projects must meet objective development standards for their mapped zoning district and the Zoning Code’s Division 3 before permits issue (§ 20-21.010). Structures for human occupancy must also stay at least 50 ft from an active or potentially active fault unless proven inactive (§ 17-08.070), and parcels follow the official Zoning Map with boundaries interpreted per Director rules (§ 20-20.010–§ 20-20.020).

Last reviewed: July 25, 2026 · AI-generated analysis · General information, not legal advice · details

Compiled from Santa Rosa's adopted code with AI research tools and grounded in the sources cited below. Verify with Santa Rosa planning staff before relying on it.

Overview

Santa Rosa’s Title 20 Zoning sets objective, parcel-level rules that control how property may be developed: setbacks, height, lot coverage, FAR, density, and where uses are allowed. Projects must be consistent with the adopted Zoning Map districts and with objective standards in the Zoning Code and related titles before permits can issue. Key cross-references include the City’s Santa Rosa Zoning districts, allowable uses tables, Santa Rosa Design Review, and subdivision/design provisions in Title 19.

Every land use and structure in Santa Rosa must be established and operated in compliance with objective development standards in the Zoning Code (including Division 3) and any permit conditions; permits issue only after those standards are met (§ 20-21.010, § 20-21.010.B–C).

How Santa Rosa organizes “Development Standards”

The Zoning Map and districts control the base standards that apply to each parcel; district boundaries and any uncertainties are resolved by the Director using specific map rules (§ 20-20.010–§ 20-20.020).
A project must be an allowable use in its district and obtain any required land use approvals listed in the allowable uses tables referenced in § 20-21.030; then it must meet all applicable development standards (§ 20-21.010.A–C).
The site must be a legal parcel created consistent with Title 19 (Subdivisions) before permits are issued (§ 20-21.010.D).
Projects must be consistent with the City’s Design Guidelines as applied through design review (§ 20-21.010.E).
A building setback line is the minimum distance structures must be kept from property lines, rights of access, sidewalks, or adopted street plan lines, whichever is greater (§ 19-08.050).
For seismic safety, no structure for human occupancy may be placed across an active fault trace or within 50 ft of an active or potentially active fault unless a geologic report proves the fault is inactive (§ 17-08.070).
Subdivision and improvement standards (grading, erosion control, public improvements, special design areas) carry development obligations that can affect site planning even outside of map actions (§ 19-04.030; § 19-04.040; § 19-04.050; § 19-56.010; § 19-56.100; § 19-64.010; § 19-20.010; § 19-08.400).
For qualifying housing projects, no rezoning is required if the proposal is consistent with objective General Plan standards; the project must still comply with the objective standards of the implementing zoning district in Table 2-1 (§ 20-20.C).

Quick table — citywide rules that commonly control projects

Decision point	What it means in Santa Rosa	Code Reference
Zoning districts and map	Zoning districts in Table 2-1 are adopted and shown on the official Zoning Map; these implement the General Plan.	§ 20-20.010–§ 20-20.020
Boundary interpretation	Lot, alley, or street centerlines usually control; split parcels use map scale or adopting ordinance; vacated streets follow centerline rules.	§ 20-20.010–§ 20-20.020 (B)(1)–(3)
Allowable uses gate	A use must be listed as allowable and obtain the permit level the tables require before any construction permits; exemptions are limited.	§ 20-21.010.A–B; § 20-21.030
Development standards gate	All uses/structures must meet development standards in the Zoning Code (incl. Division 3) and any permit conditions.	§ 20-21.010.C
Legal parcel	The site must be a parcel created per Title 19 before permits issue.	§ 20-21.010.D
Design consistency	Projects must be consistent with City Design Guidelines via design review.	§ 20-21.010.E
Building setback line	Setbacks are measured from property lines/ROW/sidewalk/plan line — the greatest of these governs.	§ 19-08.050
Seismic fault setback	No human-occupancy structure within 50 ft of an active/potentially active fault unless proven inactive.	§ 17-08.070
Subdivision/GP alignment	Development must conform to the General Plan and zoning; subdivisions must meet Title 19 standards.	§ 19-04.040; § 19-04.050
Improvements and grading	Required public improvements follow City standards; special design areas may add requirements; erosion control is mandatory.	§ 19-56.010; § 19-56.100; § 19-64.010; § 19-08.400; § 19-20.010
Housing consistency	No rezoning required if a housing project is consistent with objective GP standards; must meet implementing district’s objective rules.	§ 20-20.C

Zoning districts — what they are and where they apply

Santa Rosa’s districts are adopted by ordinance and shown on the official Zoning Map; they implement the General Plan classifications in Table 2-1 (§ 20-20.010–§ 20-20.020). Boundary uncertainties are resolved per the map rules cited above.

For each district below:

Purpose: Drawn from the General Plan land use the district implements (Table 2-1).
Typical permitted uses: Not found in source materials; allowable uses and permit levels are listed in Chapters 20-22 through 20-24 per § 20-21.030. Verify with the jurisdiction.
Key dimensional standards (setbacks/height/coverage/FAR/density): Not found in source materials. Verify with the jurisdiction.
Where it applies: As mapped on the official Zoning Map; boundary questions use § 20-20.020(B)(1)–(3).

Residential districts

RR — Rural Residential

Purpose: Implements General Plan “Residential—Very Low Density” (Table 2-1; § 20-20.010–§ 20-20.020).
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: On parcels mapped RR on the Zoning Map (§ 20-20.010–§ 20-20.020).

R-1 — Single-Family Residential

Purpose: Implements “Residential—Low Density/Open Space, Low Density, Medium Low Density.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped R-1.

R-2 — Medium Density Multi-Family Residential

Purpose: Implements “Residential—Medium Density.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped R-2.

R-3 — Multi-Family Residential

Purpose: Implements “Residential—Medium Density, Medium High Density.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped R-3.

TV-R — Transit Village-Residential

Purpose: Implements “Transit Village Medium.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped TV-R.

MH — Mobile Home Park

Purpose: Implements “Residential—Mobile Home Parks.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped MH.

Commercial and mixed-use districts

CO — Office Commercial

Purpose: Implements “Office.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CO.

CN — Neighborhood Commercial

Purpose: Implements “Mixed Use, Neighborhood Shopping Center.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CN.

CG — General Commercial

Purpose: Implements “Retail and Business Services.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CG.

CV — Motor Vehicle Sales

Purpose: Implements “Retail and Business Services.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CV.

CMU — Core Mixed Use

Purpose: Implements “Core Mixed Use.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CMU.

SMU — Station Mixed Use

Purpose: Implements “Station Mixed Use.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped SMU.

MMU — Maker Mixed Use

Purpose: Implements “Maker Mixed Use.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped MMU.

NMU — Neighborhood Mixed Use

Purpose: Implements “Neighborhood Mixed Use.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped NMU.

CSC — Community Shopping Center

Purpose: Implements “Retail and Business Services, Community Shopping Center.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped CSC.

TV-M — Transit Village–Mixed

Purpose: Implements “Transit Village Mixed Use.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped TV-M.

Industrial districts

BP — Business Park

Purpose: Implements “Business Park.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped BP.

IL — Light Industrial

Purpose: Implements “Light Industry.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped IL.

IG — General Industrial

Purpose: Implements “General Industry.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped IG.

Special purpose districts

OSC — Open Space—Conservation

Purpose: Implements “Open Space, Parks and Recreation.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped OSC.

OSR — Open Space—Recreation

Purpose: Implements “Open Space, Parks and Recreation.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped OSR.

PD — Planned Development

Purpose: Implements “All” (tailored zoning through a PD plan).
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials (PD plans typically set them). Verify with the jurisdiction.
Where: Parcels mapped PD.

PI — Public/Institutional

Purpose: Implements “Public/Institutional.”
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Where: Parcels mapped PI.

Combining/overlay districts

These apply in addition to a base district. See Santa Rosa Overlay Districts.

-G — Gateway (Combining)

Purpose/standards: Not found in source materials.
Where: Parcels mapped with “-G” in addition to a base zone (Table 2-1; § 20-20.010–§ 20-20.020).

-H — Historic (Combining)

Purpose/standards: Projects may also be subject to historic review requirements; see Santa Rosa Historic Preservation. Specific standards not included in source materials.
Where: Parcels mapped with “-H.”

-SR — Scenic Road (Combining)

Purpose/standards: Not found in source materials.
Where: Parcels mapped with “-SR.”

-DSA — Downtown Station Area (Combining)

Purpose/standards: Not found in source materials. Map area referenced in City materials defining “Downtown.”
Where: Parcels mapped with “-DSA.”

-SA — North Station Area (Combining)

Purpose/standards: Not found in source materials.
Where: Parcels mapped with “-SA.”

-SH — Senior Housing (Combining)

Purpose/standards: Not found in source materials.
Where: Parcels mapped with “-SH.”

Other citywide standards that interact with development standards

Santa Rosa Parking: Parking ratios and design are separate standards that typically apply alongside zoning dimensional rules. Not found in source materials.
Santa Rosa Landscaping and Screening: Site planting and screening standards apply citywide. Not found in source materials.
Santa Rosa Signage: Sign controls for commercial/industrial/mixed-use sites. Not found in source materials.
Santa Rosa Nonconforming Uses: Existing uses/structures must comply with Chapter 20-61 where applicable; Title 20 confirms nonconforming rules govern continuing uses (§ 20-10; Chapter 20-61 referenced).
Santa Rosa Variances and Exceptions: Pathways where strict application of objective standards may be adjusted. Not found in source materials.
Santa Rosa ADUs: ADUs are defined in Chapter 20-70. State ADU law requires local objective standards and guarantees at least one 800 sq ft detached ADU with 4 ft side/rear setbacks, subject to State height caps; see Gov. Code §§ 66321(b)(3)–(4), 66323(a)(2) (2025 HCD ADU Handbook).

Checklist

Confirm the base zoning district and any combining/overlay on the official Zoning Map; resolve boundary questions per map rules (§ 20-20.010–§ 20-20.020).
Verify the use is allowable in the district and identify the required land use permit, if any (Chs. 20-22 to 20-24; § 20-21.030).
Demonstrate compliance with all objective development standards applicable to the district and Division 3; include any prior permit conditions (§ 20-21.010.C).
Verify the site is a legal parcel created under Title 19 (Subdivisions) (§ 20-21.010.D).
Prepare materials showing Design Guidelines consistency if your project requires design review (§ 20-21.010.E).
Lay out buildings from the building setback line and check any fault setback constraints (50 ft from active/potential faults unless proven inactive) (§ 19-08.050; § 17-08.070).
Address grading, erosion control, and public improvements consistent with City standards (Public Works manuals; § 19-56.010; § 19-64.010; § 19-08.400; § 19-20.010).
If the project is housing, assess General Plan consistency; if objective GP standards are met, rezoning may not be required (§ 20-20.C).
Cross-check related standards (e.g., parking, landscaping, signage).
If strict standards create hardship, consider a variance; if existing improvements are nonconforming, review nonconforming rules (§ 20-10; Chapter 20-61 referenced).

Risks & Ambiguities

Issue	Why it matters	What to verify
Missing numeric district standards (setbacks/height/FAR/density)	Drives site planning, massing, and yield; not in source materials	Obtain the applicable district standards from Title 20 Division 2/3. Not found in source materials.
Overlay/combining district triggers	Overlays can add design or setback rules	Confirm any “-H, -G, -SR, -DSA, -SA, -SH” overlays on the parcel and their standards (Table 2-1; § 20-20.010–§ 20-20.020).
Zoning boundary uncertainty	Dictates which standards apply	Apply Director’s boundary rules (centerlines, scale, adopting ordinance) (§ 20-20.010–§ 20-20.020 (B)).
Fault proximity	Can prohibit siting within 50 ft	Commission a geologic study if near a mapped fault; 50-ft rule applies unless fault is proven inactive (§ 17-08.070).
Subdivision-related improvements	Off-site and frontage obligations can add cost	Coordinate early with Public Works standards and design guide (§ 19-56.010; § 19-08.400; § 19-20.010).
Housing consistency pathway	May save time by avoiding rezoning	Document objective GP consistency to rely on § 20-20.C; still meet zoning district objective standards.
Design Review scope	Can alter materials and site layout	Determine if DRPB review applies and prepare objective consistency showing (§ 20-21.010.E; § 20-10).
ADU constraints	State law preempts conflicting local standards	Apply state objective allowances (e.g., 800 sf/4-ft setbacks) per Gov. Code §§ 66321–66323 (2025 HCD Handbook).

Plain-English Summary

Santa Rosa assigns every parcel to a zoning district on the official Zoning Map; that district’s objective standards and allowed uses govern your project. You must show your plan meets those standards, sits behind the setback line, avoids fault setbacks of 50 feet, and satisfies public improvement and design-review requirements. Housing that meets objective General Plan criteria may not need rezoning, but it still must meet all objective zoning standards for the mapped district.

Source References

Santa Rosa Zoning Code, Title 20 — Chapters 20-10, 20-20, 20-21, 20-70 (Definitions); including § 20-20.010–§ 20-20.020 (Zoning Map, districts, boundary rules); § 20-21.010–§ 20-21.050 (Development and Land Use Approval Requirements); § 20-21.030 (Allowable Land Uses and Permit Requirements). https://ecode360.com/SA5009
Santa Rosa Planning Code, Title 19 (Subdivisions): § 19-04.030 (Conformance with standards and policies); § 19-04.040 (General plan); § 19-04.050 (Zoning code); § 19-08.050 (Building setback line); § 19-08.400 (Standard plans/specs); § 19-20.010 (Generally); § 19-56.010 (Installation of improvements); § 19-56.100 (Special design areas); § 19-64.010 (Grading and erosion). https://ecode360.com/SA5009
Santa Rosa Environmental Protection, § 17-08.070 (Setbacks—active fault). https://ecode360.com/SA5009
Santa Rosa Development Requirements, § 21-02.030 (Definitions—“development standard”). https://ecode360.com/SA5009
2025 California ADU Handbook (HCD), summaries of Gov. Code §§ 66321–66323 (state ADU objective standards). https://www.hcd.ca.gov

Sources

Source passages

Santa Rosa Zoning Code (§ 19-08.050) Medium relevance
Santa Rosa Zoning Code (§ 21-02.030) Medium relevance
Santa Rosa Zoning Code (§ 19-20.010) Medium relevance
Santa Rosa Zoning Code (§ 19-04.030) Medium relevance
Santa Rosa Zoning Code (§ 17-08.070) Medium relevance
Santa Rosa Zoning Code (§ 19-08.400) Medium relevance
CBC § 19 (§ 19-56.010) Medium relevance
Santa Rosa Zoning Code (§ 19-04.050) Medium relevance
CBC § 19 (§ 19-64.010) Medium relevance
CBC § 19 (§ 19-56.100) Medium relevance
Santa Rosa Zoning Code (§ 19-04.040) Medium relevance

Cited sections

Official Santa Rosa code library

Frequently asked questions

What can I build on an R-1 lot in Santa Rosa?

The Zoning Map assigns parcels to districts like R-1 (Single-Family Residential). A use must be listed as allowable for that district and obtain any required permit before construction; detailed use tables and permit levels are provided in Chapters 20-22 to 20-24 referenced by § 20-21.030. Dimensional standards (setbacks/height/FAR) for R-1 are not in the source materials. Verify with the jurisdiction.

What are Santa Rosa’s setback requirements?

Setbacks are measured from the “building setback line,” defined as the greatest of the distances from property line, right of access, sidewalk, or adopted street plan line (§ 19-08.050). Additionally, no human-occupancy structure may be sited across or within 50 ft of an active/potentially active fault unless a geologic report proves the fault inactive (§ 17-08.070). District-specific yard depths are not found in the source materials.

How tall can my building be in my zoning district?

Height limits are set by the district’s development standards, but those numeric caps are not included in the source materials provided. All projects must comply with the Zoning Code’s objective standards and any permit conditions (§ 20-21.010.C). Verify the applicable height standard with the jurisdiction.

Do I need design review for my project?

Projects must be consistent with the City’s Design Guidelines as applied through the design review process (§ 20-21.010.E). Whether your project triggers design review depends on the use and scope; the DRPB’s role is referenced in Title 20 administration (§ 20-10). Verify trigger thresholds with the City.

My parcel straddles a zoning line—who decides the boundary?

If a boundary uncertainty exists, the Director applies objective map rules: lot/street/alleys usually govern; split parcels rely on the zoning map scale or adopting ordinance; vacated streets use the former centerline (§ 20-20.010–§ 20-20.020 (B)(1)–(3)).

Do housing projects need rezoning to match the General Plan?

No, if a proposed housing project is consistent with objective General Plan standards and criteria, rezoning is not required; the project must still comply with the objective standards of the implementing zoning district shown in Table 2-1 (§ 20-20.C).

What if my building or use is “legal nonconforming”?

Title 20 confirms existing uses/structures must comply with Chapter 20-61 (Nonconforming Uses, Structures, and Parcels) where applicable (§ 20-10). Check Santa Rosa Nonconforming Uses and confirm the status with the City.

Where do I find parking and landscaping requirements?

Parking, landscaping, and signage standards apply in addition to zoning dimensional rules. They are separate citywide standards; see Santa Rosa Parking and Santa Rosa Landscaping and Screening. Specific numeric ratios/designs are not in the source materials.

Can I build an ADU, and what standards apply?

ADUs are defined in Chapter 20-70 (Definitions). State law guarantees certain objective allowances, including at least one 800 sq ft detached ADU with 4 ft side and rear setbacks and specific height caps (Gov. Code §§ 66321(b)(3)–(4), 66323(a)(2), 2025 HCD ADU Handbook). See Santa Rosa ADUs and verify any local objective standards that also apply.

How do “special design areas” affect my project?

City-designated special design areas (e.g., scenic hillsides, creeks, airport zones) may impose additional improvement standards to protect those resources (§ 19-56.100). Confirm if your site lies in a special design area and obtain the applicable objective requirements.

General information, not legal advice.

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