Local zoning · Costa Mesa

Costa Mesa — Design Review

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

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Last reviewed: July 1, 2026

Overview

Design review in Costa Mesa is the discretionary planning review that evaluates a project's site planning, architecture, landscaping, massing and neighborhood compatibility before approval. The Zoning Code defines what types of projects require design review, minor design review, or development review, the findings the decision‑maker must make, and the standards that guide conditions of approval. See the city's zoning rules for development standards and parking, and the municipal design criteria summarized below. § 13‑28(d), § 13‑28(i), § 13‑29(g)(14)

Note: This page strictly covers Design Review under the Costa Mesa Zoning Code (Title 13 as provided in the retrieved materials) — not building code (Title 24) or other permitting topics. See the city's Development Standards and Parking pages linked in context below for related technical requirements.

First internal links in the text (each once): the words design review, development standards, parking, overlay, ADUs, Title 24/Building Code, historic preservation, and landscaping are linked to the relevant site menu pages:

What triggers Design Review in Costa Mesa

  • Design review (full review) is required for “any construction that results in three or more dwelling units on a development lot in any residential zone, except planned development.” § 13‑28(d)

  • Minor design review applies to limited scope residential projects, specifically:

    • Any two‑story construction or second‑floor addition in the R1 zone; and
    • In R2‑MD, R2‑HD, and R3, two‑story construction on a lot that results in two or fewer dwelling units, or any second‑story addition on a lot with more than two dwelling units. § 13‑28(i)

  • Development review (a separate planning review standard) covers certain two‑story construction in the R2‑MD, R2‑HD, and R3 zones and new or enlarged nonresidential buildings in commercial/industrial zones; consult the code for exact thresholds. § 13‑28(e)

  • The general review criteria applied to planning applications (including design review) emphasize compatibility, safety, site circulation, compliance with performance standards, and consistency with the General Plan and applicable design guidelines. § 13‑29(e)

See the decision findings for design review below. § 13‑29(g)(14)

Decision standards and findings (what the reviewer must evaluate)

  • Review criteria: compatible and harmonious relationship with surrounding buildings/uses, safety and compatibility of site features, compliance with performance standards, and consistency with the General Plan and applicable specific plan/design guidelines. § 13‑29(e)

  • Design review findings (sample highlights):

    • Project complies with the Zoning Code and the purpose/intent of residential design guidelines (site planning, open space, landscaping, appearance, mass and scale, window locations, varied roof forms). § 13‑29(g)(14)(a)
    • Two‑story massing in predominantly single‑story neighborhoods must be mitigated by transitions, offsets, and other measures to reduce visual prominence. § 13‑29(g)(14)(b)
    • For affordable multifamily developments, compliance with density standards and long‑term affordability covenants is required as applicable. § 13‑29(g)(14)(c)

  • Authority, notice and appeals: the code sets who the final review authority is (see the planning application tables), requires notice and posting rules for hearings, and provides appeal procedures. § 13‑29(h)–(j)

District‑by‑district breakdown (purpose, typical uses, key standards, where it applies)

Note: the Zoning Code uses the district labels shown below. Where applicable, the specific table references are cited.

R1 (Single‑Family Residential)

  • Purpose: preserve single‑family neighborhood scale and character, ensure light/air/privacy, and allow ministerial ADU processing consistent with lot density. § 13‑31(a),(e)
  • Typical permitted uses: single‑family dwellings (per Table 13‑30 Land Use Matrix). § 13‑30 (Table 13‑30)
  • Key dimensional standards: Minimum lot area 6,000 sq ft; maximum 2 stories / 27 ft; front setback 20 ft; side 5 ft (interior); specific rear and projection rules in Table 13‑32. § 13‑32 (Table 13‑32)
  • Where it applies: citywide single‑family neighborhoods mapped as R1 (see Land Use Matrix/Table 13‑30). § 13‑30

R2‑MD (Multiple‑Family Residential — Medium Density)

  • Purpose: allow medium‑density multi‑family while retaining residential character. § 13‑31(a)
  • Typical permitted uses: multi‑family dwellings and compatible residential uses (see Table 13‑30). § 13‑30
  • Key dimensional standards: Minimum lot area 12,000 sq ft; front setback 20 ft; rear setbacks vary by story (refer Table 13‑32); parking, landscaping and storage provisions apply. Table 13‑32 and related chapters (Parking, Landscaping). § 13‑32; see Chapter VI (parking) and Chapter VII (landscaping)
  • Where it applies: mapped medium‑density multi‑family areas; two‑story work in certain cases triggers development review or minor design review as specified. § 13‑28(e),(i)

R2‑HD (Multiple‑Family Residential — High Density)

  • Purpose and uses: similar to R2‑MD but intended for higher densities permitted by Table 13‑32 and policy. § 13‑31, Table 13‑32
  • Key standards: Minimum lot area 12,000 sq ft; rear yard coverage limits; building heights generally 2 stories/27 ft; design and rear‑yard coverage rules in Table 13‑32. § 13‑32 (Table 13‑32)
  • Where it applies: higher‑density multi‑family zones; review thresholds for two‑story work spelled out in § 13‑28. § 13‑28(e),(i)

R3 (Higher Density Residential)

  • Purpose: higher intensity residential development (multifamily). § 13‑31
  • Uses: multi‑family dwellings allowed per Table 13‑30. § 13‑30
  • Key standards: Minimum lot area 12,000 sq ft; rear setback for 2‑story generally 15 ft; maximum stories 2 / 27 ft; see Table 13‑32. § 13‑32 (Table 13‑32)
  • Where it applies: higher intensity residential areas; subject to design/development review rules in § 13‑28 and design findings in § 13‑29. § 13‑28; § 13‑29

Planned Development (PDR / PDC / PDI)

  • Purpose: master‑planned, flexible development with a required master plan prior to development. § 13‑56 and Table 13‑58 (Planned Development Standards)
  • Typical permitted uses: depend on the adopted master plan; planned development zones allow residential, commercial or industrial types per the plan and Table 13‑30. § 13‑30; § 13‑58
  • Key dimensional/density rules: maximum density by PDR subcategory (PDR‑LD/PDR‑MD/PDR‑HD) and special North Costa Mesa (PDR‑NCM) rules; density increments for design excellence are authorized (see § 13‑59). § 13‑58; § 13‑59
  • Where it applies: properties zoned Planned Development and subject to an approved master plan (master plan required before building). § 13‑56; § 13‑58

TC (Town Center) / C1‑S (Shopping Center)

  • Purpose: higher intensity mixed‑use and commercial nodes; many of these districts require a master plan and have unique sign and frontage rules. Table 13‑44; § 13‑44
  • Uses and standards: commercial uses per Table 13‑30; building height, setbacks and master plan rules in Table 13‑44. § 13‑30; Table 13‑44
  • Where it applies: central commercial corridors and shopping centers; master plan requirements make design review/master plan review a key step. § 13‑56; § 13‑58

Quick reference table — most decision‑relevant design‑review triggers & standards

Issue / Standard What the code says Code Reference
When is full design review required? Construction resulting in 3 or more dwelling units on a development lot (except PD) § 13‑28(d)
When is minor design review required? Two‑story or second‑floor additions in R1; limited two‑story work in R2‑MD, R2‑HD, R3 § 13‑28(i)
Core review criteria Compatibility, safety, site planning, landscaping, massing, roof forms, General Plan consistency § 13‑29(e)
Design findings (massing/appearance) Compliance with design guidelines; reduction of two‑story prominence by offsets/transitions § 13‑29(g)(14)(a)–(b)
Residential development standards to check Lot area, setbacks, max stories (2/27 ft), rear yard coverage, projections — see Table 13‑32 § 13‑32 (Table 13‑32)
Master plan requirement PD, TC, C1‑S, mixed‑use overlay require a master plan before development § 13‑28(g); § 13‑56; Table 13‑58

How the process usually works (practical guidance)

  • Early screening/master‑plan steps are required in planned and mixed‑use overlay areas; applicants should file a screening application and obtain council/master‑plan comments before detailed submittals. § 13‑28(g)(4)
  • Expect submittal of scaled site plans, elevations, landscape plans, and a written narrative addressing compatibility and design guideline compliance (the planning division supply list of required materials). § 13‑29(a)
  • For residential projects, prepare to demonstrate how two‑story massing is mitigated (offsets, roof breaks, landscaping) because this is an explicit finding element. § 13‑29(g)(14)(b)
  • If you rely on any deviation (minor modification, administrative adjustment, variance), follow the specific deviation process and findings (Table 13‑28, § 13‑28(a) and related). § 13‑28(a),(j)

Checklist (what an applicant must satisfy before approval)

  • Submit completed planning application and all plans and materials required by the planning division (site plan, elevations, landscape plan, narrative). § 13‑29(a)
  • Address the design review findings: demonstrate compliance with residential design guidelines, landscaping, massing and compatibility (show offsets, roof breaks, window placement). § 13‑29(g)(14)(a)–(b)
  • Provide calculations/demonstrations of conformity to Table 13‑32 (lot area, setbacks, height, rear yard coverage) or document requested deviations. § 13‑32 (Table 13‑32)
  • Show parking compliance per City Parking standards (layout, stall sizes) and any trash enclosure or screening per Chapter VI/VII/VIII as applicable. See Parking and Screening rules. Chapter VI; § 13‑73; § 13‑74
  • If in PD/TC/C1‑S or mixed‑use overlay, provide master plan materials and follow screening / master plan steps. § 13‑28(g); § 13‑56; Table 13‑58
  • For projects requiring public hearing, comply with notice and posting requirements. § 13‑29(i)

Risks & Ambiguities

Issue Why it matters What to verify
Is an ADU subject to Design Review? ADU rules and state ADU law can override local standards; ADU may create a second unit (typically not 3+ units), but local ADU processing rules are separate. Ministerial ADU provisions for R1 and R2‑MD exist (§ 13‑31(e)); verify ADU review path with planning because the code's design‑review trigger is 3+ units (§ 13‑28(d)). § 13‑31(e); § 13‑28(d)
Mixed‑use overlay / specific plan exceptions Specific plans and mixed‑use overlays may change development standards or review steps. Confirm whether the parcel sits in a specific plan, mixed‑use overlay, or the North Costa Mesa area and follow that plan's text. § 13‑30(g); § 13‑200.106(g)
Which authority issues the final decision? Different planning applications have different final review authorities (Director, Planning Commission, City Council). Check Table 13‑29(c) and the individual application type to determine final review authority and whether a public hearing is required. § 13‑29 (see Table 13‑29)
Precise permitted uses for a parcel The Land Use Matrix lists uses but applicability can be affected by overlays or specific plans. Consult Table 13‑30 for use allowance, then verify parcel zoning and any overlay/specific plan constraints. § 13‑30 (Table 13‑30)
Development standard exceptions (e.g., rear‑yard coverage) Some zones allow exceptions or have special rear yard coverage calculations. Confirm which Table (13‑32, 13‑41(b), 13‑58) applies to your project type (single lot vs. common interest vs. PD). § 13‑32; § 13‑41(b); § 13‑58

If something above is unclear or parcel‑specific, verify with the City of Costa Mesa Development Services/Planning Division.

Plain‑English Summary

If your project creates three or more homes on one lot (outside a Planned Development), the city’s Zoning Code requires design review to check site layout, appearance, landscaping and how the building fits the neighborhood; smaller two‑story additions often go through a minor design review instead. The reviewer applies the code’s design findings and the residential standards in Table 13‑32 to approve, condition, or deny the project. § 13‑28(d),(i); § 13‑29(g)(14); § 13‑32

Source References

  • Costa Mesa Zoning Code: Planning application types and triggers (Design review, Minor design review, Development review) — § 13‑28.
  • Costa Mesa Zoning Code: Planning application review process, review criteria, findings, decision, notice and appeals — § 13‑29 (including design review findings at § 13‑29(g)(14)).
  • Costa Mesa Zoning Code: Purpose of residential districts & ADU ministerial note — § 13‑31.
  • Costa Mesa Zoning Code: Residential development standards (Table 13‑32 — lot area, setbacks, height, etc.). § 13‑32 (Table 13‑32).
  • Costa Mesa Zoning Code: Land Use Matrix and permitted uses (Table 13‑30). § 13‑30 (Table 13‑30).
  • Costa Mesa Zoning Code: Planned Development standards and master plan requirements (Table 13‑58, § 13‑56, § 13‑59).
  • Costa Mesa Zoning Code: Trash, elevation and screening rules relevant to design review (§ 13‑73, § 13‑74).

Related internal menu pages (linked in text above for project applicants):

  • Costa Mesa zoning & planning overview: /us/california/costa-mesa
  • Costa Mesa Zoning: /us/california/costa-mesa/zoning
  • Costa Mesa Land Use: /us/california/costa-mesa/land-use
  • Costa Mesa Development Standards: /us/california/costa-mesa/development-standards
  • Costa Mesa Parking: /us/california/costa-mesa/parking
  • Costa Mesa Overlay Districts: /us/california/costa-mesa/overlay-districts
  • Costa Mesa Historic Preservation: /us/california/costa-mesa/historic-preservation
  • Costa Mesa Landscaping and Screening: /us/california/costa-mesa/landscaping-and-screening
  • Costa Mesa ADUs: /us/california/costa-mesa/adu
  • California Building Standards Code: /us/california/building-codes

Information Gaps

  • The retrieved materials include comprehensive design‑review triggers and findings, but do not include the City’s separate “residential design guidelines” (the code references them). The specific guideline document (usually a Council resolution or design manual) was Not found in retrieved materials. Verify guideline text with the Planning Division. § 13‑29(g)(14)(a)
  • The standard checklists or exact submittal list used by the planning division (application form, exhibits checklist) were Not found in retrieved materials — obtain the current planning application checklist from the planning counter. § 13‑29(a)

Sources

Retrieved passages

  • Costa Mesa Zoning Code (section 13-200.104) High relevance
  • Costa Mesa Zoning Code High relevance
  • Costa Mesa Zoning Code (Chapter IX) High relevance
  • Costa Mesa Zoning Code (§ 1m.) High relevance
  • Costa Mesa Zoning Code (Chapter IX) High relevance
  • Costa Mesa Zoning Code Medium relevance
  • Costa Mesa Zoning Code (article shall) Medium relevance
  • CBC § 2 (§ 2) Medium relevance
  • Costa Mesa Zoning Code (section 65915.) Medium relevance
  • Costa Mesa Zoning Code Medium relevance
  • Costa Mesa Zoning Code (§ 2) Medium relevance
  • Costa Mesa Zoning Code Medium relevance
  • Costa Mesa Zoning Code (Chapter IX) Medium relevance
  • Costa Mesa Zoning Code (Chapter VI) Medium relevance

Cited sections

Frequently asked questions

Do I need design review in Costa Mesa if I add a second‑story to my R1 house?

Minor design review applies to R1 two‑story additions and second‑floor additions; the code treats all two‑story work in R1 as subject to minor design review. See § 13‑28(i) for the minor design review trigger and § 13‑29(g)(14)(b) for the review focus on reducing two‑story prominence. § 13‑28(i); § 13‑29(g)(14)(b)

What exactly triggers a full design review (not minor) in residential zones?

Full design review is required when a project results in three or more dwelling units on one development lot in any residential zone (except Planned Development). If your project is fewer units, check minor design review and development review rules. § 13‑28(d)

What are the key findings reviewers use to approve or deny design review?

Reviewers apply general planning criteria (compatibility, safety, circulation, compliance with performance standards), plus the specific design findings that require conformity with residential design guidelines, attention to massing/roof forms, and mitigation of visual prominence for two‑story structures. See § 13‑29(e) and § 13‑29(g)(14). § 13‑29(e); § 13‑29(g)(14)

Where do I find the dimensional standards (setbacks, heights) the reviewer will check?

Residential dimensional standards are in Table 13‑32 (minimum lot area, setbacks, maximum 2 stories / 27 ft, rear yard coverage, etc.). Confirm which row applies to your zone (R1, R2‑MD, R2‑HD, R3). § 13‑32 (Table 13‑32)

If my property is in a Planned Development or Overlay, do the same design review rules apply?

Planned Developments and some overlays require a master plan first and may supersede or modify standard rules; the code requires master plan approval and allows minor/major amendments subject to separate review. Always check the applicable specific plan/master plan text. § 13‑28(g); Table 13‑58; § 13‑56

Are parking and trash details part of design review?

Yes — parking layout (Chapter VI), trash enclosures (§ 13‑73) and elevation/screening rules (§ 13‑74) are part of the site design the reviewer will evaluate under the design review criteria. § 13‑73; § 13‑74

Can design review be appealed and what are the notice rules?

Yes. Notice of the decision must be given pursuant to the code’s notice provisions and appeals are available under the Municipal Code appeal procedures; the planning division provides mailed and posted notice timelines. See § 13‑29(i) and related appeals rules referenced in the chapter. § 13‑29(i)

If I want a variance or setback deviation with my design review, how is that handled?

Deviations have their own tracks (minor modification, administrative adjustment, variance). Small deviations may be processed as minor modifications (see Table 13‑28(j)(1)); larger ones require administrative adjustment or variance findings. Check § 13‑28 and Table 13‑28. § 13‑28; Table 13‑28(j)(1)

Do the design guidelines apply to multifamily affordable housing in the same way?

Affordable multifamily projects are subject to the same design findings but the code also recognizes state density/affordability requirements and may treat density bonus projects differently; specific findings reference compliance with density and affordability covenants as applicable. § 13‑29(g)(14)(c)

Where can I get the city’s design guideline document referenced by the code?

The Zoning Code references “residential design guidelines” but the guideline document itself was Not found in the retrieved materials; obtain the current guideline/resolution from the Planning Division or the planning application packet. § 13‑29(g)(14)(a)

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