Local zoning · Patterson

Patterson — Design Review

Q: Do major projects have extra design obligations?

Major development projects (Chapter 18.98 ) must apply for planned development approval; review explicitly includes architecture and site plan consistency with the general plan and design guidelines, and projects are subject to community design guidelines and the downtown physical design plan where applicable § 18.42.050 .

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

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Last reviewed: July 2, 2026

Overview

Patterson uses a two-tiered design review system: a formal architectural and site plan review for projects requiring public hearing review, and an administrative minor design review for modest, "aesthetically insignificant" changes. The code ties approval to findings about architectural unity, consistency with adopted design guidelines, and conformity with development standards (setbacks, parking, landscaping). See Patterson's main design review rules and how they interact with parking, development standards, and overlay rules such as the historic preservation overlay. Key controlling text is in § 18.18.040 (architectural and site plan review) and § 18.16.120 (minor design review) .

How Patterson organizes review (short)

Major/quasi-judicial projects → Architectural and Site Plan Review (Planning Commission hearing) § 18.18.040 .
Small/minor aesthetic changes → Minor Design Review (Planning Director) § 18.16.120 .
Approving authority table identifies which entitlements go to Director, Commission, or Council (see § 18.14.060). The table lists Architectural and Site Plan Review as Planning Commission (recommendation) and final authority as Planning Commission/City Council where appeals apply .

District-by-district breakdown

Below are the Patterson zoning districts where design review most commonly applies. Each subsection summarizes the district purpose, typical uses, development standards that most affect design review (setbacks, height, lot coverage), and where the review trigger is stated in the code.

Note: verify parcel-specific application and any overlay zoning with the city; some rules (e.g., design guidelines) are adopted separately and are applied during review. Verify with the jurisdiction.

ER (Estate Residential)

Purpose: Very low-density single-family residential, preserving low-intensity character § 18.38.010–.020 .
Typical permitted uses: Detached single-family homes and accessory structures (subject to accessory rules). See residential use table and Division V.
Key dimensional standards (development table): Front yard 20 ft, side yard 5 ft (interior), rear yard 20 ft, max height 2 stories / 32 ft, lot area min 12,000 sf, maximum impervious surface 40% (§ 18.38.040 tables) .
Design review: small single-family work may be processed as Minor Design Review; larger residential developments or master plans trigger Architectural & Site Plan Review § 18.16.120, § 18.18.040 .

LR-n / LR-w (Low Density Residential – north/west variants)

Purpose: Low-density single-family neighborhoods; uses and standards similar to ER but smaller lot sizes and higher permitted coverage § 18.38.020–.040 .
Key standards: Front yard 20 ft, typical lot area 6,000 sf, max footprint percentages in table, accessory structure limits and ingress/egress requirements § 18.62 (accessory) .
Design review: accessory structures and small remodels can be Minor Design Review; larger multi-lot developments or master home plans go to Architectural & Site Plan Review § 18.16.120, § 18.18.040 .

DR (Downtown Residential)

Purpose: Supports higher density housing in downtown core contexts § 18.38.020 .
Key standards: Density up to 10 units/acre, front yard 20 ft (generally), lot coverage up to 80% (impervious), primary structure up to 3 stories / 45 ft for DR in the residential table § 18.38.040 . Some minor adjustments (e.g., projections into setbacks) are explicitly permitted in DR via Minor Adjustment rules (see Table 18.16.110-1) .
Design review: downtown small-lot single-family exceptions and minor adjustments are noted; many downtown changes still require Architectural & Site Plan Review to ensure conformity with the downtown physical design plan § 18.18.040; § 18.42.050 .

MR / HR (Medium / High Density Residential)

Purpose: Medium to high-density multi-family housing; standards intended to support higher intensities § 18.38.020–.040 .
Key standards: MR: up to 12 units/acre; HR: up to 20 units/acre; setbacks and heights differ (see table—HR has larger side/corner setbacks and taller allowable heights in some cases) § 18.38.040 .
Design review: multi-family projects frequently trigger Architectural & Site Plan Review; major development projects must follow planned development approval process § 18.42.050 .

Commercial districts (NC, HSC, DC, GC, MPO)

Purpose & uses: Neighborhood commercial, highway service, downtown core, general commercial, and medical/professional office—each with different intensity and frontage requirements § 18.42.020–.040 .
Key standards (representative from Table 18.42.040-2): DC (downtown core) may allow up to 3 stories / 45 ft, NC lot area min 2,000 sf, maximum impervious surface up to 100% in DC, front yard/minimums vary by district § 18.42.040-2 .
Design review: commercial projects are explicitly subject to Architectural & Site Plan Review; the planning commission may condition approvals to meet adopted community design guidelines and site layout standards § 18.18.040 .

Industrial districts (LI, HI, IBP)

Purpose: Light and Heavy Industrial and the West Patterson Industrial Business Park, with uses limited to reduce impacts on residential areas § 18.46.010–.020 .
Key standards: IBP emphasizes business-park style development with buffers, screening, and performance standards (air emissions, glare, vibration) § 18.46.050–.060 .
Design review: industrial projects—especially major development projects—require planned development approval and are reviewed for architecture, site plan, landscaping, and consistency with community design guidelines § 18.42.050; § 18.46.060 .

Overlay districts: PD (Planned Development) and HP (Historic Preservation)

PD overlay: allows integrated, creative design but requires submission of a PD entitlement and final development plan; PD can modify base zone standards and often triggers more rigorous review § 18.54.020 .
HP overlay: historic designation triggers mandatory alteration permits and review of exterior changes; no building permit for designated historic properties until alteration permit processes are complete § 18.54.030; § 18.18.050 .
Design review note: projects in overlays generally require Architectural & Site Plan Review or an Alteration Permit (for HP), and the planning commission has special powers and findings for designated resources § 18.54.030 .

Quick decision-relevant table

Topic / trigger	Key rule / threshold	Code reference
When is Architectural & Site Plan Review required	“Whenever a development project is proposed” unless director finds it ‘aesthetically insignificant’ — public hearing required; Planning Commission action	§ 18.18.040
Minor Design Review (administrative)	Single-family projects and small/insignificant aesthetic changes may be handled by Planning Director	§ 18.16.120
Approving authority (who decides)	Table lists Planning Director for minor items; Planning Commission for Architectural & Site Plan Review	§ 18.14.060 (Table 18.14.060-1)
Residential front setback (typical)	Front yard 20 ft in multiple residential districts (ER/LR/DR/MR) — see district table	§ 18.38.040 (Table)
Downtown Residential max lot coverage	Impervious surface up to 80% in DR	§ 18.38.040 (Table)
Minor adjustments allowed	Projections, small setback reductions, lot coverage/height increases for certain conditions — see Table 18.16.110-1	§ 18.16.110 (Table 18.16.110-1)
Historic properties (Alteration Permit)	Any exterior alteration/demolition of designated historic properties requires an alteration permit and public hearing	§ 18.18.050; § 18.54.030
Major developments / planned development requirement	Major projects per Chapter 18.98 must use Planned Development with architecture/site review	§ 18.42.050

Checklist

An applicant seeking design review in Patterson should prepare to satisfy the following (typical minimum items — see the specific entitlement for full list):

Completed application form and applicable fee. (submittal requirement referenced in § 18.18.040)
Site plan showing existing buildings, proposed work, setbacks, parking and loading, and landscaping (required by § 18.18.040).
Building elevations, material and color palettes, and architectural details to demonstrate architectural unity and neighborhood compatibility (§ 18.18.040 findings).
Landscape plan meeting single-family or commercial landscaping standards (see Chapter 18.78) and tree replacement schedule if landscaping removed .
Parking analysis (if proposing shared, modified, or reduced parking) or standard parking plan referencing Chapter 18.76 and the parking tables § 18.76 (referenced in development tables) .
Documentation showing consistency with adopted design guidelines, specific plan, or downtown physical design plan where applicable (§ 18.18.040; § 18.42.050).
For historic resources: statements of proposed treatments, photos, and justification; building official will refer to Planning Director/Commission (§ 18.18.050; § 18.54.030) .
If requesting minor adjustments (setback projection, small height/coverage changes), identify the exact adjustment and demonstrate how it meets the minor adjustment findings (§ 18.16.110; § 18.16.120) .

Risks & Ambiguities

Issue	Why it matters	What to verify
Minor design review vs full architectural/site plan review	The planning director can deem a project “aesthetically insignificant” and treat it administratively; misclassification delays projects or triggers public hearing	Confirm with Planning Director whether the project qualifies for § 18.16.120 minor design review or requires § 18.18.040 commission review; request a pre-application meeting
Historic overlay status of a property	If property is in an HP overlay, ordinary exterior work may require an alteration permit and public hearing, blocking building permits until approved	Check property for HP overlay on the zoning map and confirm whether the property is designated; see § 18.54.030 and § 18.18.050 and consult planning staff
Applicability of adopted design guidelines	Code requires consistency with adopted design guidelines and the downtown physical design plan; guidelines may impose additional design treatments not in base zone tables	Request and review the specific design guidelines referenced during pre-submittal; cite § 18.18.040 and § 18.42.050 and ask staff which guideline edition applies
Combined entitlements / concurrent processing	Multiple entitlements raise the highest-level approving authority and change hearing/appeal routes	Confirm approving authority per Table 18.14.060-1; ensure concurrent processing if project has combined permits § 18.14.060
Minor adjustment scope and limits	Minor adjustments are capped (e.g., projection, setback limited to 4 ft in some DR contexts) and are discretionary	Check Table 18.16.110-1 and district notes (e.g., DR-only allowances) to confirm limits and whether Planning Commission referral is likely § 18.16.110
Parking or service modifications impact design approval	Parking reductions or alternate configurations require justification; they affect circulation, loading, and triggers for added conditions	Provide a parking analysis; Chapter 18.76 and Table notes require parking review and justify reductions during design review § 18.76 referenced in development tables

Plain-English Summary

If you propose exterior work in Patterson, expect either an administrative check by the Planning Director for small, low-impact changes or a public hearing and Planning Commission review for larger projects — both reviews explicitly ask that your design fit the neighborhood, follow the city's development standards (setbacks, height, parking, landscaping), and conform to adopted design guidelines § 18.16.120; § 18.18.040 .

Source References

Architectural and site plan review — § 18.18.040
Minor design review — § 18.16.120
Minor adjustment standards — Table 18.16.110-1 (Standards Subject to Minor Adjustment) § 18.16.110
Approving authority & Table 18.14.060-1 — § 18.14.060
Residential development standards (Table 18.38.040-1) — § 18.38.040
Commercial development standards (Table 18.42.040-2) — § 18.42.040-2
Industrial districts & major development projects — § 18.46.020; § 18.42.050
Planned Development (PD) overlay — § 18.54.020
Historic Preservation (HP) overlay; alteration permits — § 18.54.030; § 18.18.050
Patterson zoning & planning overview: Patterson zoning & planning overview
Patterson Zoning (design review page used as the code-anchor link): Patterson Zoning
Development standards and related chapters referenced above: Patterson Development Standards
Parking chapter referenced by development tables: Patterson Parking
Historic overlay guidance: Patterson Historic Preservation
Signage and landscaping chapters (commonly reviewed during design review): Patterson Signage and Patterson Landscaping and Screening
State building standards (for reference—Title 24 is handled separately): California Building Standards Code

Sources

Retrieved passages

Patterson Zoning Code (§ 1) High relevance
Patterson Zoning Code (§ 1) High relevance
CBC § 1 (§ 1) Medium relevance
Patterson Zoning Code (§ 1) Medium relevance
Patterson Zoning Code (title deprives) Medium relevance
Patterson Zoning Code (Chapter 18.50.) Medium relevance
Patterson Zoning Code (§ 18.42.050.) Medium relevance
Patterson Zoning Code (§ 1) Medium relevance
CBC § 110 Medium relevance
Patterson Zoning Code (§ 1) Medium relevance
Patterson Zoning Code (§ 1) Medium relevance
Patterson Zoning Code (§ 1) Medium relevance

Cited sections

Official Patterson code library

Frequently asked questions

Do I always need design review to change my house exterior in Patterson?

Not always. Small, “aesthetically insignificant” work on single-family homes can be processed as Minor Design Review by the Planning Director under § 18.16.120; larger projects or those part of a development plan generally require Architectural & Site Plan Review (public hearing) § 18.18.040 .

What findings does the Planning Commission make to approve an architectural and site plan review?

The commission must find that the architectural appearance provides unity and fits neighborhood character and that the site plan is consistent with the zoning title, specific plans, adopted development standards/design guidelines, and the general plan (see § 18.18.040 findings) .

Who decides whether a project is minor or requires a public hearing?

The Planning Director is the approving authority for minor design reviews and may refer any minor review to the Planning Commission if warranted § 18.16.120; Table 18.14.060-1 shows the approving authority for each permit type § 18.14.060 .

What documents do I need to submit for architectural and site plan review?

Applicants must submit the city’s required application form, fees, site plan showing existing and proposed conditions, building elevations, and any other materials reasonably necessary for evaluation — as required by § 18.18.040; additional checklists may be in department handouts .

If my property is in the Historic Preservation overlay, what extra steps apply?

Designated historic properties require an alteration permit for any exterior change, and the planning commission reviews these permits; no building permit for such work will be issued until the alteration permit is processed (§ 18.18.050; § 18.54.030) .

Can I ask for a minor adjustment (setback projection or small height change)?

Yes — the code lists specific standards eligible for minor adjustment (projections, small setback decreases, limited lot coverage/height increases) in Table 18.16.110-1; some allowances are limited to the DR district and/or capped (e.g., setbacks limited to 4 ft) § 18.16.110 .

Will parking modifications affect design review?

Yes — changes to required parking or loading can be part of minor adjustments (subject to limits) or require analysis and justification during design review. Development tables and chapter references require compliance with Chapter 18.76 (parking) during site plan review .

Do major projects have extra design obligations?

Major development projects (Chapter 18.98) must apply for planned development approval; review explicitly includes architecture and site plan consistency with the general plan and design guidelines, and projects are subject to community design guidelines and the downtown physical design plan where applicable § 18.42.050 .

Where are the district-specific dimensional standards I need to follow?

District development standards are in the tables under the district chapters — residential standards in § 18.38.040, commercial in § 18.42.040-2, industrial chapters § 18.46.020, etc.; design review enforces consistency with these tables during approval .

Can the Planning Director send my minor review to the Commission?

Yes. The Planning Director may refer a minor design review (or minor adjustment) to the Planning Commission at their discretion for policy, magnitude, or unique circumstances; such referral becomes a noticed public hearing § 18.14.060(C) .

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