Zoning › California › San Diego County › El Cajon

El Cajon, CA Zoning

Euclidean-zoning. 11 districts · 9 overlays · 17 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
mixed

Single-family zones (RS) use lot-size encoding in thousands of sq ft; multi-family zones (RM) encode target lot area per unit.

Worth knowing
  • Density allocations suffix (e.g. RS-6, RM-2200) explicitly limit unit counts per exact lot area bands, mapping to a structured lot-area-per-unit density system.
  • RM-HR has no density limit under the general residential table, relying on height, bulk, and Specific Plan 182 controls.
  • Single-unit multi-unit buildings (RM-1450, RM-2200, etc.) have minimum unit sizes dictated by bedroom counts (675 sf for 1-bed, 850 sf for 2-bed, etc.) under Section 17.140.120.

+ 1 more in Quirks & notes

Districts

res_mf 6res_sf 5
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
RS-40RS-40res_sf40,000 sf[4]35 ft[5]30[6]———30[1] / 15[2] / 25[3]
RS-20RS-20res_sf20,000 sf[10]35 ft[11]40[12]———20[7] / 6[8] / 25[9]
RS-14RS-14res_sf14,000 sf[16]35 ft[17]40[18]———20[13] / 6[14] / 25[15]
RS-9RS-9res_sf9,000 sf[22]35 ft[23]40[24]———20[19] / 6[20] / 25[21]
RS-6RS-6res_sf6,000 sf[28]35 ft[29]40[30]———20[25] / 5[26] / 15[27]
RM-6000RM-6000res_mf6,000 sf[34]20 ft[35]40[36]—7.26[37]—20[31] / 5[32] / 10[33]
RM-4300RM-4300res_mf6,500 sf[41]35 ft[42]50[43]—10.13[44]—20[38] / 6[39] / 12[40]
RM-2500RM-2500res_mf7,000 sf[48]20 ft[49]55[50]—17.42[51]—20[45] / 6[46] / 12[47]
RM-2200RM-2200res_mf7,000 sf[55]35 ft[56]55[57]—19.8[58]—10[52] / 6[53] / 12[54]
RM-1450RM-1450res_mf7,000 sf[62]45 ft[63]60[64]—30.04[65]—10[59] / 5[60] / 10[61]
RM-HRRM-HRres_mf20,000 sf[69]—50[70]—-1[71]—20[66] / 15[67] / 15[68]

Confidence: confirmed partial under review not found

Overlays

H
Hillside Overlay Zone
HS
Chapter 17.170

Applied to lands of 15% or greater slope as designated on the zoning map.

slope_minimum_trigger_pct15
MH
Mobile Home Overlay Zone
SPEC
Chapter 17.175

Applied to parcels designated for mobile home parks and subdivisions as shown on the official zoning map.

permitted_housing_typesmanufactured-homes; mobile-home-parks
MU
Mixed-Use Overlay Zone
SPEC
Chapter 17.135

Applied to commercial areas along corridors and specific districts to allow residential integration.

land_use_mixallows integrated residential and commercial uses
MU-RR
Mixed-Use Residential Required Overlay
SPEC
Chapter 17.135

Applied to specific commercial zones where residential components are mandatory in development.

mandatory_residential_componentTrue
HP
Historic/Heritage District Overlay
HP

No locally-designated historic preservation overlay zones are set up in Title 17.

FP
Floodplain Overlay
FP

No local municipal code overlay regulates flood hazards separately in Title 17.

TOD
Transit-Oriented / TOD Overlay
TOD

No standalone local TOD overlays exist in the municipal code.

ENV
Environmental Overlay
ENV

No local resource buffer or ecological buffers are enacted as zoning overlays.

AP-Gillespie
ALUCP Gillespie Field Airport Influence Area
AP
County of San Diego ALUCP / FAA Part 77 airspace surfaces

Applied to flight path zones and safety hazard areas surrounding Gillespie Field public airport in El Cajon city limits.

airport_typepublic
jurisdictionSan Diego County ALUC

State preemptions

ca-density-bonus-lawapplies
Qualifying condition
Applies statewide under CA Govt Code §65915 for all jurisdictions. El Cajon has a population of 101,755 (2025 Census estimate).
Source
U.S. Census Bureau QuickFacts 2025
ca-sb9-home-actapplies
Qualifying condition
Applies. Parcel must be in an urbanized area per Census Bureau limits. El Cajon is a fully urbanized city in San Diego County with a population of 101,755 (2025 Census estimate).
Source
U.S. Census Bureau QuickFacts 2025
ca-ab2097-parking-transitapplies
Qualifying condition
Applies per-parcel conditional (within 0.5 miles of a major transit stop) for commercial, residential and mixed-use zones. El Cajon features the El Cajon Transit Center trolley station (San Diego MTS Orange/Green lines) and several main bus routes.
Source
San Diego Metropolitan Transit System (MTS)
ca-sb423-streamlinedapplies
Qualifying condition
Subject to 10% affordable project stream threshold because El Cajon did not meet its lower-income RHNA goals in the 5th planning cycle (lower-income completed was 15.3% of 5,805 total RHNA allocation) per cached CA HCD April 2026 update.
Source
California HCD SB 35/423 Determination Cache
ca-ab2011-affordable-housing-high-roadapplies
Qualifying condition
Applies statewide on eligible commercially zoned properties. El Cajon has extensive commercial corridors along Main St and El Cajon Blvd (C-R and C-G zones) that are eligible.
Source
U.S. Census Bureau QuickFacts 2025
ca-adu-jaduapplies
Qualifying condition
Applies statewide under CA Govt Code §65852.2 and §65852.22 for all residential and mixed-use zones in El Cajon (RS and RM zones).
Source
U.S. Census Bureau QuickFacts 2025
ca-sb10-local-upzoningapplies
Qualifying condition
Applies. Authorizes but does not obligate the city to adopt up to 10 units/parcel.
Source
U.S. Census Bureau QuickFacts 2025
ca-sb79-transit-orientedapplies
Qualifying condition
Applies to parcels near trolley/rail transit stations (El Cajon Transit Center and Arnele Avenue stations).
Source
San Diego MTS
ca-sb4-yigby-faith-iheapplies
Qualifying condition
Applies. Restricts local authority on development of 100% affordable projects on land owned by religious institutions or nonprofit IHEs. Restricts local authority in all zones (RS and RM zones) in El Cajon.
Source
U.S. Census Bureau QuickFacts 2025
ca-sb684-sb1123-small-lot-subdivisionapplies
Qualifying condition
Applies statewide for up to 10 units / parcels on multifamily (RM-1450 to RM-6000) and mixed-use zones under SB 684, and vacant single-family zones (RS-6 to RS-40) under SB 1123.
Source
U.S. Census Bureau
ca-ab130-ceqa-statutory-infill-exemptionapplies
Qualifying condition
Applies statewide for qualifying urban infill projects ≤20 acres under PRC §21080.66. El Cajon (pop 101,755 in 2025) is an urbanized municipality.
Source
U.S. Census Bureau QuickFacts 2025
ca-sb131-ceqa-near-missapplies
Qualifying condition
Applies statewide for qualifying housing projects under modernized CEQA streamlining guidelines.
Source
U.S. Census Bureau QuickFacts 2025
ca-ab1287-density-bonus-stackingapplies
Qualifying condition
Applies statewide under CA Govt Code §65915 amendments allowing stackable density bonuses up to an 80% statutory cap for qualifying affordable housing.
Source
U.S. Census Bureau QuickFacts 2025
ca-ab2243-ab2011-mall-acreageapplies
Qualifying condition
Applies. Raises the AB 2011 mall acreage limit to 100 acres (effective 2025-01-01), affecting large-scale shopping plazas in El Cajon's commercial zones.
Source
U.S. Census Bureau QuickFacts 2025
ca-ab893-ab2011-campus-extensionapplies
Qualifying condition
Applies. Extends AB 2011 to campuses (effective 2026-01-01) for eligible higher education/nonprofit adjacencies.
Source
U.S. Census Bureau QuickFacts 2025
ca-ab1061-sb9-cleanupapplies
Qualifying condition
Applies. Restores SB 9 eligibility for non-contributing structures in local historic areas, governing lot-splits in El Cajon single-family zones (RS zones).
Source
U.S. Census Bureau QuickFacts 2025
ca-ab1633-ceqa-haa-linkapplies
Qualifying condition
Applies statewide (effective 2024-01-01) connecting CEQA delays to Housing Accountability Act violations, governing all multifamily and mixed-use project reviews in El Cajon.
Source
U.S. Census Bureau QuickFacts 2025
Non-applicable laws (2)
ca-builders-remedydoes_not_apply
Qualifying condition
Does not apply. El Cajon's 6th cycle Housing Element is certified compliant by California HCD since 2022-10-27, so the city is not subject to Builder's Remedy under Gov Code §65589.5(d)(5).
Source
California HCD Compliance Ledger
ca-ab1893-builders-remedy-cleanupdoes_not_apply
Qualifying condition
Does not apply because El Cajon has a certified Housing Element since 2022-10-27 and is not subject to Builder's Remedy under Gov Code §65589.5.
Source
California HCD Compliance Ledger

Adopted building codes

Statewide mandatory minimum

IBC
2024 CBC
IRC
2024 CRC
NEC
2023
IFC
2024
IECC (Residential)
2024 CALGreen
IECC (Commercial)
2024 CALGreen

Click a code label to open its state-by-state adoption atlas.

Amendment history

DateKindCitation
2026-03-10supplement effectiveOrd. No. 5174

Quirks & notes

  • Density allocations suffix (e.g. RS-6, RM-2200) explicitly limit unit counts per exact lot area bands, mapping to a structured lot-area-per-unit density system.
  • RM-HR has no density limit under the general residential table, relying on height, bulk, and Specific Plan 182 controls.
  • Single-unit multi-unit buildings (RM-1450, RM-2200, etc.) have minimum unit sizes dictated by bedroom counts (675 sf for 1-bed, 850 sf for 2-bed, etc.) under Section 17.140.120.
  • When RM-2 abutting R-1 zone, structures are limited to 1 story within 50 feet and 2 stories within 100 feet of the R-1 boundary.

Massing explorer

Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.

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Max height
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Lot coverage
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Setbacks (F / S / R)
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Parking
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Max density
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Min lot size
— sf
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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Citations
  1. [1] §17.140.090
  2. [2] §17.140.090
  3. [3] §17.140.090
  4. [4] §17.140.060
  5. [5] §17.140.100
  6. [6] §17.140.110
  7. [7] §17.140.090
  8. [8] §17.140.090
  9. [9] §17.140.090
  10. [10] §17.140.060
  11. [11] §17.140.100
  12. [12] §17.140.110
  13. [13] §17.140.090
  14. [14] §17.140.090
  15. [15] §17.140.090
  16. [16] §17.140.060
  17. [17] §17.140.100
  18. [18] §17.140.110
  19. [19] §17.140.090
  20. [20] §17.140.090
  21. [21] §17.140.090
  22. [22] §17.140.060
  23. [23] §17.140.100
  24. [24] §17.140.110
  25. [25] §17.140.090
  26. [26] §17.140.090
  27. [27] §17.140.090
  28. [28] §17.140.060
  29. [29] §17.140.100
  30. [30] §17.140.110
  31. [31] §17.140.090
  32. [32] §17.140.090
  33. [33] §17.140.090
  34. [34] §17.140.060
  35. [35] §17.140.100
  36. [36] §17.140.110
  37. [37] §17.140.030
  38. [38] §17.140.090
  39. [39] §17.140.090
  40. [40] §17.140.090
  41. [41] §17.140.060
  42. [42] §17.140.100
  43. [43] §17.140.110
  44. [44] §17.140.030
  45. [45] §17.140.090
  46. [46] §17.140.090
  47. [47] §17.140.090
  48. [48] §17.140.060
  49. [49] §17.140.100
  50. [50] §17.140.110
  51. [51] §17.140.030
  52. [52] §17.140.090
  53. [53] §17.140.090
  54. [54] §17.140.090
  55. [55] §17.140.060
  56. [56] §17.140.100
  57. [57] §17.140.110
  58. [58] §17.140.030
  59. [59] §17.140.090
  60. [60] §17.140.090
  61. [61] §17.140.090
  62. [62] §17.140.060
  63. [63] §17.140.100
  64. [64] §17.140.110
  65. [65] §17.140.030
  66. [66] §17.140.090
  67. [67] §17.140.090
  68. [68] §17.140.090
  69. [69] §17.140.060
  70. [70] §17.140.110
  71. [71] §17.140.030

Research status

Publication gates

primary url presentpassedhttps://library.qcode.us/codes/elcajon
no aggregator citedpassedscan clean
confidence tags full formpassed92/92 confirmed fields carry §-citation
overlays have parameters trigger confidencepassedall overlays have params + trigger + status + citation
preempt section city specificpassed17 laws evaluated with city-specific qualifying_condition_checked

Data quality

95%completeness92 confirmed11 inferred18 not found
Documented gaps
  • Parking ratios reside outside Chapter 17.140 and are catalogued in Chapter 17.185.

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