Local zoning · San Anselmo

San Anselmo — Design Review

Q: Are ADUs subject to design review in San Anselmo?

ADUs must meet objective ADU standards in § 10-6.302 ; if an ADU does not meet those objective standards, it may be processed through the discretionary design review procedures set out in Article 15. Garage conversions and parking consequences for ADUs can also trigger design review. See § 10-6.302 and § 10-3.504 .

Q: If my lot includes any area above 150 ft MSL, what changes?

Any lot with area at/above 150 ft Mean Sea Level is treated with stricter design review — hillside findings apply (screening, colors, low visual profile) and Table 4E maximum dwelling size rules interact with the design review findings. See § 10-3.1505(c) and § 10-3.1506(c–d) . Verify parcel elevation.

Design Review under the San Anselmo local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

San Anselmo’s local zoning ordinance places design review in Article 15 of Title 10, Chapter 3 (the zoning code). The design review program exists to review and shape exterior improvements so projects fit neighborhood character, protect public safety, and minimize off‑site visual impacts. Key rules cover what projects are subject to review, who reviews them, the application contents, and the findings required for approval (§ 10-3.1501 through § 10-3.1506).

Note: this page stays strictly within the Town zoning ordinance; building-code matters (e.g., [California Building Standards Code])(/us/california/building-codes) are outside this summary.

What the ordinance requires (quick map)

Purpose / scope: § 10-3.1501 — design review purpose and applicability.
Initiation: § 10-3.1502 — owner or Town Council can initiate.
Application contents: § 10-3.1503 — minimum submittal items (site plan, elevations, colors/materials, environmental worksheet, fees, story poles if required).
Review authority & thresholds: § 10-3.1504 — Planning Director (administrative) vs Planning Commission (public review); lists minor items the Director may approve and items the Commission must review.
Projects subject to review: § 10-3.1505 — enumerates triggers by district and project type.
Required findings: § 10-3.1506 — district‑specific findings (Commercial/Professional/R-3; R-1/R-2/R-3 flatland; R-1‑H/R-1‑C/hillside).
Notice/public hearing rules: § 10-3.1601 — when public hearings are required.

This page synthesizes those provisions for common San Anselmo districts; verify parcel‑specific triggers with the Planning Department.

District-by-district (design-review focus)

The Town’s zoning districts and their design‑review posture are described in § 10-3.201. The ordinance differentiates flatland vs hillside (above 150 ft Mean Sea Level) and applies tiered review accordingly.

R-1-H (Very Low Density Residential)

Purpose: preserve primary ridges and ridge zones and limit visible impacts from hillside development; design review is mandatory and tiered (Preliminary/Precise Development Plan options exist for undeveloped hillside parcels). § 10-3.201, § 10-3.1001–1003.
Typical permitted uses: single‑family residential (density limited to 1 unit/acre; ADUs allowed as accessory). § 10-3.201.
Design-review triggers & standards: all exterior modifications and new buildings on hillside lots; findings in § 10-3.1506(c) focus on low visual profile, screening, and blending with environment. See Table 4E for maximum dwelling sizes and note that the maximum size is further constrained by meeting design‑review findings.

R-1-C (Single‑Family Residential‑Conservation)

Purpose: conserve secondary ridgelines/hillsides and require design review for most exterior improvements. Density commonly 1 unit/acre for constrained lands. § 10-3.201.
Typical uses: single‑family dwellings, accessory structures, ADUs (subject to ADU rules and sometimes design review). § 10-3.201, § 10-6.302.
Design-review triggers: exterior changes on lots with any area at/above 150 ft MSL; required findings per § 10-3.1506(c).

R-1 (Single‑Family Residential)

Purpose: conventional single‑family neighborhoods; lots above 150 ft MSL trigger stricter design-review scrutiny to protect hillside character. § 10-3.201.
Typical uses: single‑family, ADUs permitted (objective ADU standards exist; if an ADU does not meet those objective standards it may be subject to standard design review). § 10-6.302.
Design-review triggers: additions and most exterior improvements above 150 ft MSL; smaller additions in side‑yard narrow cases may also require design review per § 10-3.1505(e) and findings in § 10-3.1506(b).

R-2 (Two‑Family) and R-3 (Multi‑Family / Institutional)

Purpose & uses: R-2 allows two‑unit developments; R-3 covers multi‑family, churches, convalescent homes, etc. § 10-3.201 and related tables.
Design-review triggers: R-3 and larger commercial/professional projects (and R-2 additions under some conditions) are subject to design review; for multi‑family/commercial, findings in § 10-3.1506(a) emphasize compatibility, safety, and traffic/parking considerations.

Commercial / Professional (non‑residential)

Trigger & scope: all new commercial/professional buildings and exterior modifications are subject to design review; projects ≥ 1,200 sq ft for commercial are specifically noted in the code for review standards and compatibility with historic facades. § 10-3.1505, § 10-3.1506(f).

Overlays, Ridge Zones, and Special Processes

Ridges and the “ridge zone” receive heightened scrutiny; construction in ridge zones must demonstrate no feasible alternative and be designed to a low visual profile; the design-review process determines acceptability § 10-3.1001 and other R-1‑H provisions.
See the Town’s Overlay Districts information for maps and overlay rules; verify parcel‑specific overlays with staff. (Not all overlay map specifics are reproduced here.)

Key decision-relevant table

Topic	What matters to a reviewer	Code reference
Projects that must get design review	New commercial/professional/ R‑3 buildings; exterior modifications in many districts; hillside projects above 150 ft MSL; ADU conversions may trigger review	§ 10-3.1505
Who decides	Planning Director (administrative) for minor mods; Planning Commission for most exterior improvements, public bodies, requests to exceed Table 4E, and when other applications require Commission review	§ 10-3.1504
Findings required	District‑specific findings for compatibility, privacy, light/air, safety, screening, low visual profile (hillside) and consistency with General Plan	§ 10-3.1506
Application minimums	Completed form, environmental worksheet, fees, site plan, exterior elevations, color/material samples, any other required info/story poles	§ 10-3.1503
Hillside/dwelling‑size limits	Table 4E sets maximum adjusted floor area for lots above 150 ft MSL; design review may further limit size	§ 10-3.412 / Table 4E § 10-3.1506(d)
ADUs and design review	Objective ADU standards are in Chapter 6; if an ADU fails to meet the objective standards it may go through the standard discretionary design review process; garage conversions/parking changes often require design review	§ 10-6.302, § 10-3.504

(For parking siting and dimensions, consult the Town’s Parking rules and Table 5A; the ordinance requires screening and setback compliance for on‑site parking—see § 10-3.507–10-3.511.)

Checklist (what an applicant must submit / satisfy)

Provide a completed application form and pay the Town’s fees (§ 10-3.1503).
Submit an environmental worksheet in the Planning Director’s form (§ 10-3.1503).
Provide a site plan and exterior elevations showing proposed materials and colors; include color/material samples (§ 10-3.1503).
For hillside projects, include photos, story poles (if required), screening/landscape plans, and any geology/soils reports requested under R-1‑H rules (§ 10-3.1002–1003, § 10-3.1503).
If the project affects parking or proposes replacing garage spaces (ADU conversion), show compliance with the Parking Standards Table and screening measures (§ 10-3.504, § 10-3.1505(g)).
Be prepared for either Planning Director administrative review or Planning Commission public meeting depending on the trigger (§ 10-3.1504).

Risks & Ambiguities

Issue	Why it matters	What to verify
Whether an ADU is exempt from local design review	State ADU law can limit local discretionary review; a project may be objectively ministerial or still be routed to design review if it fails objective ADU standards	Verify whether the ADU meets the objective standards in § 10-6.302; if not, expect discretionary design review. § 10-6.302
Hillside (≥ 150 ft MSL) vs flatland triggers	The 150‑ft MSL breakpoint increases scrutiny and stricter findings; incorrect elevation assumptions can trigger extra hearings	Confirm parcel elevation; if any part is at/above 150 ft MSL, design‑review triggers in § 10-3.1505(c) and findings in § 10-3.1506(c) apply.
Applicability of Planning Director vs Commission	Some “minor” items may still be sent to Commission if other concurrent permits require Commission review	If the project has multiple applications, all may be consolidated at the Commission level per § 10-3.1504; confirm with Planning Director.
Exact numeric setbacks, lot coverage, and FAR	Many development standards are in tables (Table 4A, Table 4E, Table 5A) that the ordinance references but numerical values are not reproduced in full here	See the Development Standards Table (Table 4A) and Table 4E for parcel‑specific numbers; not all numeric values are reproduced here—Verify with Table 4A/4E and Planning staff. Not found in retrieved materials for every numeric value.
Effect of historic facades	Commercial projects must not harm pre‑1960 facades; there may be discretionary interpretation	Confirm historic‑resource status with the Historic Preservation program and cite § 10-3.1506(f).

Plain‑English summary

If you want to change the outside of a building in San Anselmo, expect design review unless your change is very minor; submit a site plan, elevations, and color/material samples, and be ready to show how the project protects neighbors, public safety, and the town’s character — especially if your property sits in the hillside/R-1-H or R-1-C areas above 150 ft MSL. § 10-3.1501–1506 explain the tests and process.

Information Gaps (what the retrieved materials do not fully confirm)

The full numeric values in Table 4A (development standards) and Table 5A (parking standards) are referenced but their complete contents were not extracted in the retrieved snippets here; parcel‑specific setbacks/lot coverage numbers should be verified in those tables or with staff. Not found in retrieved materials (numeric tables partially not reproduced).
Exact map locations of overlay zones (ridge zone boundaries) and the Town’s official Table 4D (R-1‑H parcels list) are not reproduced here — check Town maps. Not found in retrieved materials.

Source References

§ 10-3.1501 (Purpose and intent of Design Review).
§ 10-3.1502 (Initiation of Design Review).
§ 10-3.1503 (Application requirements for Design Review).
§ 10-3.1504 (Review authority — Planning Director vs Planning Commission).
§ 10-3.1505 (Projects subject to Design Review by district).
§ 10-3.1506 (Required findings for Design Review — district‑specific).
§ 10-3.1601 (Public hearings & noticing rules — when Design Review is considered at a noticed meeting).
§ 10-3.201 (Designation & establishment of Zoning Districts; R-1‑H / R-1‑C descriptions).
§ 10-3.412 and Table 4E (Maximum dwelling sizes and interplay with design review).
§ 10-3.504 (Garage/ADU conversion parking and design review triggers).
§ 10-6.302 (Objective ADU design standards; discretionary review if not met).

Internal links cited in the text above:

Sources

Retrieved passages

San Anselmo Zoning Code (Section 10-3.1506) High relevance
San Anselmo Zoning Code (§ 1) High relevance
San Anselmo Zoning Code (Section 10-3.1601) High relevance
San Anselmo Zoning Code (§ 2) High relevance
San Anselmo Zoning Code (Section 10-3.504) Medium relevance
San Anselmo Zoning Code (§ 1) Medium relevance
San Anselmo Zoning Code (Title 10) Medium relevance
San Anselmo Zoning Code (Article 15) Medium relevance
San Anselmo Zoning Code (section of) High relevance
San Anselmo Zoning Code (Section 10-3.1506) High relevance
San Anselmo Zoning Code (Section 10-3.1506) Medium relevance

Cited sections

Official San Anselmo code library

Frequently asked questions

Do I always need design review to paint the exterior of my house in San Anselmo?

Not always. The ordinance allows the Planning Director to approve minor exterior modifications such as paint color changes administratively, but certain exterior modifications are listed as projects subject to design review and the Director may refer a project to the Planning Commission if desirable. See § 10-3.1504 and § 10-3.1505.

What triggers Planning Commission (public) review versus administrative review?

The Planning Director handles minor modifications (awnings, canopies, doors, windows, color) administratively; the Planning Commission reviews all other exterior improvements and specific items (e.g., requests to exceed Table 4E maximums). If an application includes another item requiring Commission review, all associated applications go to the Commission. See § 10-3.1504.

Are ADUs subject to design review in San Anselmo?

ADUs must meet objective ADU standards in § 10-6.302; if an ADU does not meet those objective standards, it may be processed through the discretionary design review procedures set out in Article 15. Garage conversions and parking consequences for ADUs can also trigger design review. See § 10-6.302 and § 10-3.504.

What findings will the Planning Commission make to approve a design review?

Findings vary by district: for commercial/professional/R-3 projects the project must be compatible, protect from noise/odors, not reduce surrounding property values, avoid traffic hazards, protect health/safety, and be consistent with the General Plan (§ 10-3.1506(a)). For residential (R-1/R-2/R-3 flatland) and hillside (R-1-H/R-1-C) projects there are separate findings regarding light, privacy, bulk/massing, screening, and low visual profile (§ 10-3.1506(b)-(c)).

If my lot includes any area above 150 ft MSL, what changes?

Any lot with area at/above 150 ft Mean Sea Level is treated with stricter design review — hillside findings apply (screening, colors, low visual profile) and Table 4E maximum dwelling size rules interact with the design review findings. See § 10-3.1505(c) and § 10-3.1506(c–d). Verify parcel elevation.

What must I include in a design-review submittal?

At minimum: a completed application form, environmental worksheet, fees, site plan, exterior elevations, and color/material samples; the Planning Director can require additional information (story poles, photos, landscaping). § 10-3.1503 lists the minimum submittal requirements.

Can design review limit the size of my house?

Yes. Table 4E establishes maximum adjusted floor area for lots above 150 ft MSL and the ordinance explicitly states that house size is further limited by applicable design review findings; the Town may further limit size on visible hills/ridges to reduce visual impact. See § 10-3.412 and § 10-3.1506(d).

If my project is reviewed by the Planning Commission, can I appeal?

Yes: discretionary decisions by the Planning Commission (including Conditional Use Permits and certain plan approvals) are appealable under the Town’s appeal procedures; public hearing and noticing requirements are in § 10-3.1601. Verify appeal deadlines in the Municipal Code.

Are parking reductions or parking‑in‑setbacks requests decided through design review?

Conversions that remove parking (e.g., garage→ADU) or new parking within required setbacks can be allowed only with design review and must show mitigation via screening/landscaping; the code ties such parking changes to § 10-3.504 and design findings § 10-3.1506(a). Also consult the Town’s Parking standards.

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