Local zoning · Marin County

Marin County — Design Review

Design Review under the Marin County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

In unincorporated Marin County, “Design Review” is a discretionary planning entitlement governed by the Marin County Development Code (Title 22), specifically Chapter 22.42. In the Coastal Zone, the Marin County Local Coastal Program (Title 20) repeatedly emphasizes that Design Review is required under Chapter 22.42 and applies independent of, and in addition to, any Coastal Development Permit. See the County’s definitions and coastal tables that direct applicants to Design Review in Chapter 22.42 (Design Review) for design-related approvals.

Design Review sits alongside other planning topics you may also need to consider, including zoning, development standards, parking, overlay districts, historic preservation, and variances and exceptions. This page focuses narrowly on Marin County’s Design Review as implemented under the County’s zoning framework in unincorporated areas.

Plain-English core rule: Design Review is required under Chapter 22.42 of the Marin County Development Code, and in the Coastal Zone it is required independent of, and in addition to, any Coastal Development Permit.

What Design Review Is (and where it lives in the Code)

The Marin County Development Code is Title 22. Design Review is in § 22.42 (Design Review). Multiple Coastal provisions and tables reiterate this location and state that design-review requirements apply independent of Coastal permitting.
In the Coastal Zone, Title 20 (Local Coastal Program, “LCP”) governs CDPs. It also flags specific situations that trigger Design Review under § 22.42, e.g., certain heights, recreational courts, agricultural processing, and special housing.
If your site is in the Coastal Zone, you will almost always need a Coastal Development Permit per § 20.62.040.B, and you may also need Design Review under § 22.42.

When Design Review is Required in the Coastal Zone (selected triggers explicitly identified in the LCP)

Single-family dwellings that exceed 25 ft in height require Design Review and a Variance under § 20.70.150, in addition to any Coastal Development Permit. This trigger is called out in coastal development standards tables and notes.
Tennis and other private, non-commercial outdoor courts accessory to a residence require Design Review; lighting may be prohibited or restricted as a Design Review condition. See § 20.32.130.D.
Agricultural processing facilities require Design Review unless entirely within an existing structure without significant exterior alteration; see § 20.32.028.C.
In the C-VCR and C-H1 districts, the maximum floor area for certain projects may be determined through the Design Review process per notes to coastal standards tables (citing Chapter § 22.42).
Employee housing in designated zones is permitted but flagged for Design Review requirements independent of any CDP (see coastal allowed-use tables and notes referencing § 22.42).

Relationship to the Coastal Development Permit

In the Coastal Zone, Design Review is not a substitute for a Coastal Development Permit. The LCP repeatedly states that Design Review per § 22.42 is “independent of, and in addition to,” CDP requirements. Use tables and notes in Title 20 point you back to Chapter § 22.42 whenever design discretion is required.

District-by-District Design Review touchpoints (Coastal Zoning)

Below are the coastal zoning districts applied in unincorporated Marin County, with Design Review-relevant highlights explicitly identified in the LCP. Where a district has no Design Review-specific trigger in the retrieved materials, we note “Not found in retrieved materials,” but Design Review under § 22.42 may still apply. Verify with the jurisdiction.

C-APZ (Coastal, Agricultural Production Zone)

Purpose: Preserve productive agricultural lands; ensure development is accessory/incidental to agriculture. Key standard: development must support agricultural production.
Typical uses: Agriculture and related uses (see Title 20 use tables; CDP often required). Design Review may be triggered by specific proposals (e.g., agricultural processing).
Dimensional standards: Not comprehensively listed here; see coastal standards chapters/tables. Not found in retrieved materials (DR-specific).
Where it applies: Coastal agricultural areas per the County’s zoning map and LCP.

C-ARP (Coastal, Agricultural, Residential Planned)

Purpose/uses: Agricultural-residential planned district within the Coastal Zone. Not found in retrieved materials (DR-specific).
Dimensional standards: Not found in retrieved materials (DR-specific).
Design Review: Refer to § 22.42 for DR; CDP likely also required. Not found in retrieved materials (additional triggers).

C-OA (Coastal, Open Area)

Purpose/uses: Open area conservation; see LCP for siting and resource protection standards. Not found in retrieved materials (DR-specific).
Design Review: Refer to § 22.42; no specific DR triggers found beyond general LCP direction. Not found in retrieved materials.

C-RA (Coastal, Residential, Agricultural)

Typical permitted uses: Single-family dwellings are generally principal permitted uses per coastal tables; ADUs permitted ministerially where applicable.
Height and courts: If a dwelling exceeds 25 ft, DR + Variance + CDP needed. Tennis courts require DR per § 20.32.130.D.
DR-specific standards: Not found in retrieved materials.

C-R1 (Coastal, Residential, Single-Family)

Permitted uses: Single-family dwellings; ADUs ministerially per LCP ADU provisions where applicable.
Height: In the Stinson Beach Highlands portion of C-R1, the primary height limit is 17 ft; dwellings over 25 ft trigger DR + Variance + CDP.
DR-specific standards: Not found in retrieved materials (beyond triggers above).

C-R2 (Coastal, Residential, Two-Family)

Uses: Two-family dwellings allowed in C-R2 per coastal tables.
DR-specific triggers: Not found in retrieved materials. Courts require DR (see § 20.32.130.D).

C-RSP (Coastal, Residential, Single-Family Planned)

Uses/standards: Planned single-family; see coastal standards. Not found in retrieved materials (DR-specific).
DR: Refer to § 22.42; courts require DR (see § 20.32.130.D). Not found otherwise.

C-RSPS (Coastal, Residential, Single-Family Planned, Seadrift Subdivision)

Special standards: Seadrift has its own height and ocean setback standards, including NAVD-based height caps.
DR: No Seadrift-specific DR trigger retrieved; Design Review may still apply under § 22.42; verify case-by-case. Not found in retrieved materials.

C-RMP (Coastal, Residential, Multiple Planned)

Uses: Multiple residential planned; see use tables.
DR triggers: Not found in retrieved materials (beyond general DR and court trigger at § 20.32.130.D).

C-VCR (Coastal, Village Commercial/Residential)

Purpose: Maintain historic village character; balance village-serving and visitor-serving uses.
Typical standards: Examples include front/side/rear setbacks and a 25 ft height limit per coastal commercial/mixed-use standards table.
DR linkage: Maximum floor area may be established through the Design Review process under § 22.42.

C-H1 (Coastal, Limited Roadside Business)

Purpose: Roadside commercial; see coastal use tables. Not found in retrieved materials (purpose narrative).
DR linkage: As with C-VCR, maximum floor area may be established through Design Review under § 22.42.

C-CP (Coastal, Planned Commercial)

Uses/standards: Planned commercial with table-based development standards. Not found in retrieved materials (DR-specific).
DR: Refer to § 22.42 for DR; no explicit trigger retrieved beyond general LCP statements. Not found in retrieved materials.

C-RMPC (Coastal, Residential/Commercial Multiple Planned)

Uses: Mixed planned; see use tables. Not found in retrieved materials (DR-specific).
DR: Refer to § 22.42. Not found in retrieved materials (additional triggers).

C-RCR (Coastal, Resort and Commercial Recreation)

Uses: Resort/commercial recreation; per coastal use tables. Not found in retrieved materials (DR-specific).
DR: Refer to § 22.42. Not found in retrieved materials (additional triggers).

C-PF (Coastal, Public Facilities)

Purpose: Public/institutional facilities; can be a primary or combining district on public sites.
DR: Refer to § 22.42 based on project type; no explicit DR triggers retrieved. Not found in retrieved materials.

-B (Coastal Minimum Lot Size) Combining District

Purpose: Establishes different lot sizes and setbacks than the primary district. Table 5-5 provides standards.
DR: Notes reiterate that Design Review requirements are in § 22.42 and apply in addition to CDP.

Design Review triggers you can actually use

The following items are expressly tied to Design Review in the LCP and direct you to Chapter § 22.42.

Situation	Where it applies	What it means	Code Reference
Single-family over 25 ft in height	Coastal residential districts (e.g., C-R1, C-RA)	Requires Design Review, a Variance, and a Coastal Development Permit	§ 20.70.150; coastal table notes referencing § 22.42 and 25 ft trigger; Table 5-4-b notes
Private outdoor tennis/other courts (accessory)	All coastal residential districts	Requires Design Review; lighting may be conditioned/limited	§ 20.32.130.D (courts and fencing/lighting standards)
Agricultural processing facilities	Coastal agricultural districts	DR required unless fully inside existing structure with no significant exterior change	§ 20.32.028.C
Maximum floor area determination	C-VCR, C-H1	Floor area may be set through Design Review	Table 5-4-b note referencing § 22.42
Employee housing	Where allowed per tables	Allowed with Design Review requirements independent of CDP	Coastal table notes referencing § 22.42
General rule in Coastal Zone	All coastal districts	DR is in § 22.42 and applies independent of any CDP	Definitions/table notes referencing § 22.42

Note: If your parcel is in the Coastal Zone, a CDP is separately required unless exempt; see § 20.62.040.B.

Practical coordination with other rules

Development standards like setbacks, heights, and projections still apply and are reviewed for consistency as part of a discretionary review; see coastal standards such as projections into setbacks (Table 3-1) and -B Combining District standards (Table 5-5).
Where your project needs relief from a standard, Design Review may be paired with a variance. For example, houses over 25 ft in height in the Coastal Zone require both Design Review and a Variance.
If your project includes signs or landscaping, expect parallel compliance with signage and landscaping and screening standards through Design Review.
Historic properties may trigger review for compatibility in addition to Design Review; see historic preservation. For ADUs, state law makes most approvals ministerial, but objective design standards can still apply; see California ADU law.

Checklist

Confirm your site’s location and base district(s) using Marin County Zoning and whether it lies in the Coastal Zone (if so, a CDP is typically required per § 20.62.040.B).
Identify whether your proposal clearly triggers Design Review in the LCP (examples above) and, regardless, whether Design Review is required under § 22.42 for your project type or site. Not found in retrieved materials (text of § 22.42).
For single-family projects that may exceed 25 ft in height, plan for Design Review + Variance + CDP; note special 17 ft primary height in the C‑R1 Stinson Beach Highlands area.
If proposing a tennis/sport court, include fencing/lighting details for Design Review under § 20.32.130.D.
If proposing agricultural processing, determine whether the work is fully within an existing structure without exterior change; otherwise, Design Review applies under § 20.32.028.C.
In C‑VCR or C‑H1, coordinate early on whether floor area will be set through Design Review under § 22.42 (per Table 5‑4‑b notes).
Cross-check any overlays (e.g., “-B” Combining District) and related standards that will be evaluated during Design Review.
Align your submittal package with Design Review requirements in § 22.42. Not found in retrieved materials (application contents, findings, or procedures).
Keep nonconforming situations in mind; if existing conditions are nonconforming, see nonconforming uses.

Risks & Ambiguities

Issue	Why it matters	What to verify
Missing text of § 22.42	The exact Design Review thresholds, findings, and submittals are housed there	Obtain the current text of § 22.42 from Marin County CDA; confirm whether your project is ministerial or discretionary
Coastal vs. inland DR	Coastal projects need CDP plus Design Review when triggered	Confirm if your parcel is in the Coastal Zone and whether any categorical exclusions apply per § 20.62.040.B and Chapter 20.68
Height > 25 ft	Triggers DR + Variance + CDP; highly visible projects are scrutinized	Confirm measured height methodology and whether the Stinson Beach Highlands 17 ft limit applies
Courts and lighting	Accessory courts need DR; lighting may be prohibited/limited	Provide photometrics and shielding details under § 20.32.130.D
Ag processing	Nearly always DR unless entirely internal/no exterior change	Scope the work carefully against § 20.32.028.C
FAR via DR (C‑VCR/C‑H1)	Floor area can be set in Design Review	Discuss intended massing early; rely on Table 5‑4‑b note to § 22.42

Information Gaps

The actual language of Marin County Development Code § 22.42 (Design Review)—including application contents, approval criteria, exemptions, and review authority—was not present in the retrieved materials. Not found in retrieved materials.
Inland (non-Coastal) base-district Design Review thresholds and any “objective” vs. “discretionary” DR criteria. Not found in retrieved materials.
Detailed Design Review procedures (public notice, hearing requirements, appeal) specific to § 22.42. Not found in retrieved materials.

Plain-English Summary

In unincorporated Marin County, Design Review is a discretionary check on architecture, site planning, and fit with community standards. If you’re in the Coastal Zone you’ll likely need a Coastal Development Permit, and on top of that, certain projects—like homes taller than 25 ft, residential tennis courts, agricultural processing, or projects in C‑VCR/C‑H1 where floor area is set through Design Review—will also need Design Review under § 22.42. Plan early around height, setbacks, and neighborhood context, and confirm the precise Design Review steps directly with Marin County.

Source References

Marin County Coastal Zoning Code definitions noting that Design Review lives in Chapter 22.42 and applies independent of CDP: § 20.130 (definitions excerpt).
Coastal allowed-use tables and notes directing to § 22.42 (Design Review) and explaining independence from CDP: Tables 5‑2/5‑3 notes.
CDP requirement in the Coastal Zone: § 20.62.040.B.
Single-family height trigger (>25 ft) for DR + Variance + CDP, and the C‑R1 Stinson Beach Highlands 17 ft primary height: coastal standards notes/Table 5‑4‑b; Table 5‑5 notes. Also references § 20.70.150 (Coastal Zone Variances).
Tennis and other courts require Design Review (lighting may be conditioned): § 20.32.130.D.
Agricultural processing DR requirement (exceptions for fully internal/no exterior changes): § 20.32.028.C.
C‑VCR/C‑H1 floor area may be set through Design Review: Table 5‑4‑b notes to § 22.42.
Seadrift Subdivision standards (context for C‑RSPS): § 20.65.070.

Also see: Marin County zoning & planning overview, Marin County Development Standards, Marin County Overlay Districts, Marin County Variances and Exceptions, Marin County Landscaping and Screening, California Building Standards Code, California housing laws.

Sources

Retrieved passages

Marin County Zoning Code (Section 20.64.080) Medium relevance
Marin County Zoning Code (Chapter 22.42) Medium relevance
Marin County Zoning Code (Section 22.82.050) Medium relevance
Marin County Zoning Code (Section 22.82.050) Medium relevance
Marin County Zoning Code (Chapter 22.42) Medium relevance
Marin County Zoning Code (Section 20.32.028.A.1) Medium relevance
Marin County Zoning Code (§ III) Medium relevance
Marin County Zoning Code (Chapter 20.130) Medium relevance
Marin County Zoning Code (Chapter 20.130) High relevance
Marin County Zoning Code (Section 20.64.040) Medium relevance
Marin County Zoning Code (Section 20.70.070) Medium relevance
Marin County Zoning Code (§ III) Medium relevance
Marin County Zoning Code (Chapter 22.48) Medium relevance
Marin County Zoning Code (title to) Medium relevance

Cited sections

Official Marin County code library

Frequently asked questions

Do I need design review in the unincorporated Coastal Zone of Marin County?

Often yes. Most development in the Coastal Zone requires a Coastal Development Permit, and when your project hits design-related triggers (e.g., height over 25 ft, tennis courts, agricultural processing), you also need Design Review under § 22.42, independent of the CDP. See § 20.62.040.B and the coastal notes directing to § 22.42.

When does a single-family house trigger Design Review?

If the dwelling exceeds 25 ft in height, Design Review and a Variance are required in addition to any CDP. In the C‑R1 Stinson Beach Highlands subarea, the primary height limit is 17 ft. See coastal tables/notes referencing § 22.42 and § 20.70.150.

Are private tennis or sport courts subject to Design Review?

Yes. Private, non-commercial outdoor courts accessory to a residence require Design Review, and lighting may be prohibited or restricted as a condition of approval. See § 20.32.130.D.

Do agricultural processing facilities need Design Review?

Yes, unless the processing is wholly inside an existing permitted structure with no significant exterior change. Otherwise Design Review is required in addition to a CDP. See § 20.32.028.C.

In C‑VCR or C‑H1, can floor area be set through Design Review?

Yes. Notes to the coastal development standards indicate that maximum floor area in C‑VCR and C‑H1 may be determined through the Design Review process under § 22.42.

Is Design Review the same as building plan check under Title 24?

No. Design Review is a planning entitlement focused on site/architectural fit under § 22.42; building plan check is under the California Building Standards Code. The LCP clarifies that Design Review applies independent of the CDP.

Do ADUs require Design Review?

Most ADUs are processed ministerially under state law; see the County’s ADU provisions referenced in coastal tables. Some objective design standards may still apply. See the LCP ADU entries referencing § 20.32.140 and the state framework in California ADU law.

How do I know if my site is in the Coastal Zone?

Check the County’s maps and the LCP’s applicability provisions at § 20.62.020 and § 20.62.040.B. Projects in the Coastal Zone typically need a CDP and, as applicable, Design Review under § 22.42.

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