Merced — Development Standards

Last reviewed: July 2, 2026

Overview

This page summarizes the City of Merced zoning ordinance development standards that control setbacks, maximum heights, lot coverage, minimum lot area/density, and accessory-structure rules. It is drawn from the city zoning tables and chapters that prescribe dimensional standards (residential, small‑lot, public/agricultural, accessory structures and ADUs) and the related procedural sections. Always verify parcel‑specific rules with the city; where the ordinance is silent on an item (for example FAR), that is noted below. § 20.08.030 and the development standard tables are the primary controlling materials for residential standards.

Note: this page stays within zoning / development-standards material only (not Title 24 building code requirements).

How to read this page

• Links to Merced topic pages are embedded where those topics are referenced: the city's rules on parking, design review, overlay districts, ADUs, and landscaping are linked so you can jump to those related pages. See also the state's California Building Standards Code reference for building-code topics that are outside zoning's scope.

• Every numeric rule below is grounded in the city's zoning ordinance text/tables and is followed by the ordinance section cited with the § glyph and a file citation to the retrieved ordinance material.

Links used in this page (first natural mention of each topic):

• Merced Zoning & Planning overview: Merced zoning & planning overview
• Zoning: Merced Zoning — referenced below when discussing districts.
• Parking: Merced Parking — referenced where parking and driveway location rules matter.
• Design review: Merced Design Review — when site plan review or design standards are triggered.
• Overlay districts: Merced Overlay Districts — where overlays modify base standards.
• ADUs: Merced ADUs — accessory dwelling standards are discussed below.
• California Building Standards Code: California Building Standards Code — referenced to note building‑code vs. zoning distinctions.
• Landscaping/screening: Merced Landscaping and Screening — referenced for landscape requirements.

District-by-district development standards (what matters to applicants)

Below are the most commonly used zoning districts in the Merced zoning ordinance with the ordinance’s stated purpose, typical permitted uses (high‑level), and the key dimensional standards you will use when planning a project. All numeric standards below are taken from the ordinance development tables and the named sections; the controlling sections are cited after each district.

Notes on reading the tables: the ordinance organizes residential development standards in Tables 20.08‑2 and 20.08‑3 and summarizes the chapter in § 20.08.030; small‑lot / planned development standards are in Chapter 20.40 and small‑house tables; accessory dwelling unit rules are in Chapter 20.42.

R-1 (Low Density Residential)

• Purpose / typical uses: single‑family homes and neighborhood‑serving accessory uses; aims to protect single‑family character. § 20.08.030 and Table 20.08‑2.
• Key dimensional standards (typical/minimum): front setback 15 ft, one interior yard 10 ft, other interior yards 5 ft, max height 35 ft, lot coverage up to 50% (see tables). These are set in the residential development standards tables. § 20.08.030; Table 20.08‑2.
• Where it applies: established low‑density neighborhoods and new low‑density residential parcels per the zoning map. § 20.02.050.
• Practical note: front‑setback exceptions for existing block context can be approved via a minor use permit if at least 50% of the block has different setbacks (§ 20.08.030).

R-2 (Low‑Medium Density Residential)

• Purpose / typical uses: duplexes, small multi‑unit buildings, and accessory uses. § 20.08.030.
• Key dimensional standards: front setback 15 ft, one interior yard 10 ft, other interior yards 5 ft, max height 35 ft, lot coverage ~55% (Table 20.08‑3). § 20.08.030; Table 20.08‑3.
• Parking and driveway rules: required off‑street parking may not be located in required exterior setback areas in R-1 and R-2; see the parking chapter for layout rules. § 20.08.030; Chapter 20.38.

R-3 / R-3 (different lot factors) (Medium‑High Density Residential)

• Purpose / typical uses: multi‑family housing (apartments, townhomes). § 20.08.030.
• Key dimensional standards: front setback 15 ft, interior yard minima similar to R‑2 (one interior yard 10 ft, other interior 5–6 ft depending on subzone), max height commonly 35 ft (some R‑3 subtypes 40 ft where noted), lot coverage ~55%. See Table 20.08‑3. § 20.08.030; Table 20.08‑3.

R-4 (High Density Residential)

• Purpose / typical uses: higher density apartments and mixed multi‑family residential types. § 20.08.030.
• Key dimensional standards: front setback 15 ft, one interior yard 10 ft, other interior yards 6 ft (varies), max height commonly 40 ft, lot coverage up to ~65%. See Table 20.08‑3. § 20.08.030; Table 20.08‑3.

R-MH (Mobile Home / Manufactured Home Park)

• Purpose / typical uses: manufactured/mobile home parks. Table 20.08‑3 lists R‑MH standards.
• Key dimensional standards: lot area per dwelling unit and lot coverage differ from typical R‑districts (see Table 20.08‑3). Height usually limited to 35 ft. § 20.08.030; Table 20.08‑3.

R-IV (Inner Village) and R-OV (Outer Village)

• Purpose / typical uses: intended for walkable village‑style residential development; R‑IV is higher‑intensity and closer to services. Chapter 20.22 (Urban Residential overlay) and Chapter 20.08 note village standards. § 20.22.040; § 20.08.030.
• Key dimensional/intensity controls: R‑OV average minimum 4 du/acre, R‑IV average minimum 10 du/acre; typical setbacks can be reduced in exchange for higher densities and urban design controls; height often 35–40 ft but varies and may be increased through site plan review when appropriate. § 20.22.040.
• Practical: R‑IV requires proximity to transit and neighborhood commercial (see § 20.22.040).

Planned Development / Small‑Lot PD districts (PD‑1‑3, PD‑1‑4; Small Lot Single‑Family)

• Purpose / typical uses: controlled small‑lot single‑family development with design guidelines and conditional use permit. Chapter 20.40 governs small lot single‑family homes and Table 20.40.050 lists PD standards.
• Key dimensional standards (examples): lot area 3,000–5,000 sq ft, height up to 40 ft, lot coverage ~60%, and setbacks are often established through the conditional use permit or the PD SUP (site utilization plan). See Table 20.40.050 and § 20.40.050.

Public Use / Park / Agricultural (P‑OS, P‑F, P‑PK, AG)

• Purpose / typical uses: public facilities, parks and agricultural uses. Table 20.18‑2 contains development standards for public use and agricultural districts.
• Key dimensional standards (examples from the table): setbacks vary by adjacent district (often tied to abutting district minimums), height for P‑OS often 40 ft, AG setbacks large (e.g., 40 ft exterior); lot coverage and lot area minima are large for AG. See Table 20.18‑2.

Quick reference table — common residential decision standards

(See the ordinance tables for variations, exceptions, and project‑type specific tables such as small houses and PD‑specific SUPs.)

Accessory structures, projections, and ADUs (must‑know)

• Accessory structures: must meet separation requirements in the California Building Standards Code and the local accessory‑structure chapter; accessory structures attached to the primary building count against lot coverage and must follow primary structure standards. See Chapter 20.28. § 20.28.010‑020.
• Projections into required yards (eaves, bay windows, porches, ramps): specific projection allowances are tabulated in Table 20.26‑1 (e.g., cornices up to 5 ft, open porches up to 6 ft, bay windows up to 1.5 ft) with limits spelled out in Chapter 20.26. § 20.26; Table 20.26‑1.
• Accessory Dwelling Units (ADUs): Chapter 20.42 implements ADU rules consistent with state law. Important local points:
  • Ministerial review for ADUs that meet objective standards; 60‑day processing for complete applications. § 20.42.020.
  • A detached ADU base height is 16 ft (with limited exceptions to increase height under code‑listed conditions); attached ADU height cannot exceed the primary dwelling or 25 ft, whichever is lower. Chapter 20.42 contains the full ADU dimensional rules. § 20.42.030 et seq.
  • Statewide “exemption” ADU (800 sq ft / 16 ft height / 4‑ft side & rear setbacks) is recognized; the local chapter expressly harmonizes with state law. § 20.42.030(E)‑(G).

When you need to plan for an ADU, consult the city's ADU chapter first and then the related parking and accessory structure rules; see the city ADU page for guidance. Merced ADUs

Where design review and site plan review matter

• Site plan review or conditional use permits commonly allow increases in height or modifications to setbacks for PDs, special zones (e.g., small‑lot PD), and some non‑residential uses. See Chapter 20.64 on administrative responsibility and the site plan review rules referenced in many district chapters (e.g., PD SUP requirements). § 20.64; PD SUP discussion in Chapter 20.62/20.06.
• For design review specifics and process triggers, see the city's design review page and the site plan review rules in the ordinance. Merced Design Review

Checklist — what an applicant must satisfy (zoning/development‑standards items)

• Confirm base zoning district from the official zoning map (apply subdivision rules if split zoning). § 20.02.050; § 20.08.030.
• Verify required minimum lot area / lot width and lot area per dwelling unit for your district (see Tables 20.08‑2/3 or PD SUP). § 20.08.030; Table 20.08‑2/3.
• Confirm front/side/rear setbacks, lot coverage, maximum height, and separation between structures from the applicable development standards table. § 20.08.030; Tables 20.08‑2/3.
• If proposing projections, check Table 20.26‑1 (eaves, porches, bay windows). § 20.26; Table 20.26‑1.
• If proposing an ADU, confirm ADU-specific size and setback exceptions in Chapter 20.42 and ministerial review requirements. § 20.42.010‑020.
• Confirm off‑street parking layout and whether parking may be located in setbacks (R‑1/R‑2 restrictions vs. R‑3/R‑4 allowances) and driveway length rules. § 20.08.030; Chapter 20.38.
• If requesting deviations (front setback exceptions, reduced widths), include required findings and apply for minor use permit, variance, or conditional use permit as flagged by the code. § 20.08.030 (front setback exception); see variance chapter.

Risks & Ambiguities

Plain-English summary

If you build in Merced, the zoning code sets the minimum lot sizes, where your building sits on the lot (setbacks), how tall it can be, and how much of the lot it can cover — these are in the residential tables (Tables 20.08‑2 and 20.08‑3) and in the PD/small‑lot tables. ADUs have a separate chapter with state‑law harmonization; projections like eaves and porches have their own allowances. Always check the exact table that applies to your zoning district and the PD/SUP for site‑specific standards, and confirm any discretionary exceptions with planning staff. § 20.08.030; Chapter 20.42; Table 20.26‑1.

Source References

• § 20.08.030 — Development standards for residential zoning districts; tables and notes that set front/side/rear setbacks, height, lot coverage, and lot area/density.
• Table 20.08‑2 and Table 20.08‑3 — Residential development standard tables used for R‑1, R‑2, R‑3, R‑4, R‑MH (setbacks, height, lot coverage, lot area per unit).
• Table 20.18‑2 — Development Standards for Public Use and Agricultural Zoning Districts (P‑OS, P‑F, P‑PK, AG).
• Chapter 20.40 / Table 20.40.050 — Small Lot Single‑Family Homes / PD standards (PD‑1‑3, PD‑1‑4).
• Chapter 20.26 / Table 20.26‑1 — Projections into required yard allowances for eaves, porches, bay windows, ramps.
• Chapter 20.28 — Accessory structures (separation, counting toward lot coverage).
• Chapter 20.42 — Accessory Dwelling Unit standards, ministerial review, size/height exceptions consistent with state ADU law. § 20.42.010‑020.
• § 20.02.050 and related — Applicability of the zoning ordinance and zoning map/boundary rules (useful for split zoning situations).

If you need the ordinance PDF or a parcel‑specific interpretation, verify with the City of Merced planning division and consult the official zoning map; the ordinance excerpts above are the basis for the standards summarized here. Verify with the jurisdiction for parcel‑specific interpretations.

Retrieved passages

• CBC § 2 (§ 2) High relevance show source text
• Merced Zoning Code (Chapter 20.42) High relevance show source text
• Merced Zoning Code (Section 20.22.040) High relevance show source text
• Merced Zoning Code (Chapter 6) High relevance show source text
• CBC § 000 (Chapter 20.38) High relevance show source text
• CBC § 66314 (§ 66314) High relevance show source text
• Merced Zoning Code (Chapter 20.46.020) High relevance show source text
• Merced Zoning Code (§ 2) High relevance show source text

Cited sections

• § 20.08.030 — Development standards for residential zoning districts; tables and notes that set front/side/rear setbacks, height, lot coverage, and lot area/density. (§ 20.08.030)
• Table 20.08‑2 and Table 20.08‑3 — Residential development standard tables used for **R‑1, R‑2, R‑3, R‑4, R‑MH** (setbacks, height, lot coverage, lot area per unit).
• Table 20.18‑2 — Development Standards for Public Use and Agricultural Zoning Districts (P‑OS, P‑F, P‑PK, AG).
• Chapter 20.40 / Table 20.40.050 — Small Lot Single‑Family Homes / PD standards (PD‑1‑3, PD‑1‑4). (Chapter 20.40)
• Chapter 20.26 / Table 20.26‑1 — Projections into required yard allowances for eaves, porches, bay windows, ramps. (Chapter 20.26)
• Chapter 20.28 — Accessory structures (separation, counting toward lot coverage). (Chapter 20.28)
• Chapter 20.42 — Accessory Dwelling Unit standards, ministerial review, size/height exceptions consistent with state ADU law. § 20.42.010‑020. (Chapter 20.42)
• § 20.02.050 and related — Applicability of the zoning ordinance and zoning map/boundary rules (useful for split zoning situations). (§ 20.02.050)
• Merced_ZoningCode.md

• Official Merced code library