Zoning › Wisconsin › Rock County › Janesville

Janesville, WI Zoning

Euclidean-zoning. 19 districts · 6 overlays · 7 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
letter-code

Janesville Chapter 42 (city internal: Chapter 18) is a traditional Euclidean zoning ordinance adopted 1981. District codes use letter-code convention: R1/R2/R3/R3M/R4 (residential), O1/O2 (office), B1-B6 (commercial/business), M1-M4 (industrial/manufacturing), A (agricultural), C (conservancy). Numbers are sequential index, not lot-size or density encoded. R3M is a mobile home park variant of R3. The city retained GRAEF consultants Spring 2024 to consolidate 23 current districts into 17 proposed districts; new code not yet adopted as of date researched. Municode codifies the ordinance as Chapter 42; city's internal code numbering is Chapter 18 — both appear in active planning documents simultaneously (confirmed from 2019 Building Division fee memo §18.32.030 and ZBA minutes citing §42-356).

Worth knowing
  • Dual chapter numbering: city's internal ordinance numbering uses Chapter 18 (e.g. §18.32.030 referenced in 2019 Building Division fee memo); Municode codification uses Chapter 42 (e.g. §42-356 referenced in ZBA minutes). Both appear in active city planning documents simultaneously.
  • Zoning ordinance originally adopted 1981. Comprehensive rewrite underway: GRAEF consultants engaged Spring 2024 to consolidate 23 current districts into 17 proposed; new code not yet adopted as of 2026-05-27.
  • Rezoning fee structure confirmed from 2019 Building Division memo (Laserfiche): R1/R2/Conservancy/Agricultural = $400; MF (R3/R3M/R4)/Office/Commercial/Industrial = $600. Fee tier is independent of dimensional standards.

+ 5 more in Quirks & notes

Districts

com 5ind 4res_mf 3res_sf 2off 2cbd 1ag 1spec 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
R1Single-Family Residential Districtres_sf—[4]—[5]—[6]—[7]—[8]—[9]—[1] / —[2] / —[3]
R2Single-Family Residential District (Medium Density)res_sf—[13]—[14]—[15]—[16]—[17]—[18]—[10] / —[11] / —[12]
R3Multi-Family Residential Districtres_mf—[22]—[23]—[24]—[25]—[26]—[27]—[19] / —[20] / —[21]
R3MMobile Home Park Districtres_mf—[31]—[32]—[33]—[34]—[35]—[36]—[28] / —[29] / —[30]
R4High-Density Multi-Family Residential Districtres_mf—[40]—[41]—[42]—[43]—[44]—[45]—[37] / —[38] / —[39]
O1Office Districtoff—[49]—[50]—[51]—[52]——[53]—[46] / —[47] / —[48]
O2Office-Residential Districtoff—[57]—[58]—[59]—[60]——[61]—[54] / —[55] / —[56]
B1Neighborhood Business Districtcom—[65]—[66]—[67]—[68]——[69]—[62] / —[63] / —[64]
B2Community Business Districtcom—[73]—[74]—[75]—[76]——[77]—[70] / —[71] / —[72]
B3General Business Districtcom—[81]—[82]—[83]—[84]——[85]—[78] / —[79] / —[80]
B4Highway Business Districtcom—[89]—[90]—[91]—[92]——[93]—[86] / —[87] / —[88]
B5Central Business Districtcbd—[97]—[98]—[99]—[100]——[101]—[94] / —[95] / —[96]
B6Business Park Districtcom—[105]—[106]—[107]—[108]——[109]—[102] / —[103] / —[104]
M1Light Industrial Districtind—[113]—[114]—[115]—[116]——[117]—[110] / —[111] / —[112]
M2General Industrial Districtind—[121]—[122]—[123]—[124]——[125]—[118] / —[119] / —[120]
M3Heavy Industrial Districtind—[129]—[130]—[131]—[132]——[133]—[126] / —[127] / —[128]
M4Industrial Park Districtind—[137]—[138]—[139]—[140]——[141]—[134] / —[135] / —[136]
AAgricultural Districtag—[145]—[146]—[147]—[148]—[149]—[150]—[142] / —[143] / —[144]
CConservancy Districtspec—[154]—[155]—[156]—[157]——[158]—[151] / —[152] / —[153]

Confidence: confirmed partial under review not found

Overlays

AOZ
Airport Overlay Zoning District
AP
Chapter 42, Article XVI

Properties in the vicinity of Southern Wisconsin Regional Airport (Janesville; FAA KJVL); applies within approach/departure corridors and height restriction zones based on FAA Part 77 surfaces

height_restrictionsBased on runway approach surfaces per FAA Part 77; specific maximum height values not extracted (Municode Cloudflare-blocked)
usesCompatibility restrictions on noise-sensitive land uses (residential, schools, hospitals) within AICUZ-equivalent noise/accident zones; specific use matrix not extracted
SW
Shoreland-Wetland Overlay District
ENV
Chapter 42, Article XV

Properties adjacent to navigable waterways, lakes, and wetland areas within the jurisdictional shoreland zone under Wisconsin Shoreland Protection Rule (Wis. Stat. §59.692 / NR 115): 1,000 ft from navigable lakes/ponds/flowages, 300 ft from navigable rivers/streams. Rock River corridor and associated tributaries are primary trigger areas within Janesville

setbacksSetbacks from waterway and wetland boundaries per NR 115 minimums; specific distances not extracted (Municode Cloudflare-blocked)
vegetationVegetative buffer standards along shore zone
stormwaterStormwater runoff restrictions
height_coverageBuilding height and impervious coverage limitations within shore zones; NR 115 ceiling applies (county may not exceed NR 115)
HD
Historic District Overlay
HP
Chapter 42; Historic Preservation Commission established 1981

Locally designated historic landmarks and historic districts within Janesville; triggers upon listing on local register maintained by Historic Preservation Commission

reviewDesign review required for exterior alterations, demolition, new construction within locally designated historic properties
guidelinesPreservation guidelines for facades, windows, doors, materials consistent with Secretary of Interior Standards
TOD-ABSENT
TOD Overlay — absence documented
TOD
statusnot_found
search_performedSearched city planning documents, Plan Commission meeting minutes, and comprehensive plan references for transit-overlay or transit-station area overlay; no BRT/high-frequency transit network in Janesville supporting a TOD overlay; Janesville Transit System operates fixed-route bus but no TOD overlay district identified
AH-ABSENT
Affordable Housing Overlay — absence documented
AH
statusnot_found
search_performedSearched Chapter 42 article headings and city planning documents for density bonus, inclusionary zoning, or affordable housing overlay district; no AH overlay identified in current Chapter 42 framework
COR-ABSENT
Corridor/Highway Overlay — absence documented
COR
statusnot_found
search_performedSearched Chapter 42 article headings and city planning documents for highway corridor overlay, US-14/WI-51 corridor overlay, or similar road corridor overlay districts; none identified in current Chapter 42 framework

State preemptions

Wis. Stat. §66.1014 — Short-Term Rental Floorapplies
Qualifying condition
§66.1014 applies universally to all Wisconsin municipalities regardless of population. Janesville population 63,760 (2020 Census). §66.1014(2)(a) voids any blanket ban on rentals ≥7 consecutive days; §66.1014(2)(b) voids any prohibition on dwellings rented >6 nights/year if total rental days ≤180/year. Local permitting and reasonable regulations (noise, parking, safety) permitted under §66.1014(2)(d).
Effect
Janesville may not impose a blanket ban on STRs. Local registration, inspection, noise/occupancy/parking regulations, and room-tax collection permitted. A minimum-stay requirement that eliminates short stays is void.
Wis. Stat. §66.10013 — Annual Housing Affordability and Fee Reportsapplies
Qualifying condition
§66.10013 triggers at jurisdiction population > 10,000. Janesville population 63,760 (2020 Census) > 10,000 threshold. Janesville must annually publish: (1) housing affordability report listing regulations that affect cost of new residential development with per-unit cost estimates; (2) housing fee report listing total development-related fees. Reports must be posted on city website and DOA statewide registry. Failure to publish causes loss of eligibility for workforce-housing loan programs and certain shared-revenue supplements (2023 Act 18).
Effect
Reporting obligation applies. Non-compliance risks loss of WHEDA/workforce-housing program eligibility.
Wis. Stat. §66.10014 — Development Moratorium Limitapplies
Qualifying condition
§66.10014 applies universally to all Wisconsin political subdivisions. Janesville may not impose a residential building-permit or subdivision-approval moratorium unless: (1) duration ≤ 365 days; (2) adopted to address a specific identified infrastructure/public-health concern; (3) applied uniformly. Serial moratoria on the same subject are prohibited. Private right of action for aggrieved parties.
Effect
Caps any Janesville residential development moratorium at 365 days; serial moratoria prohibited.
Wis. Stat. §66.10015 — Vested Rights and Down-Zoning Prohibitionapplies
Qualifying condition
§66.10015 applies universally. After issuance of a building permit or filing of a preliminary plat, Janesville may not rezone to a less-intense district or impose new design standards for the affected parcel without owner consent. Date-of-application rule: if application is substantially complete on filing date, the ordinance in effect at filing governs.
Effect
Vested rights attach at filing; Janesville cannot retroactively downzone or impose new standards on pending applications.
Wis. Stat. §62.23(7)(de) — Substantial-Evidence CUP Standardapplies
Qualifying condition
§62.23(7)(de) applies to all Wisconsin cities via 2017 Act 67. An applicant who provides substantial evidence that a CUP application meets local standards is entitled to approval. Reverses traditional discretionary CUP standard. Janesville ZBA discretionary 'compatible with neighborhood character' denials without substantial-evidence findings are vulnerable on certiorari review.
Effect
Janesville CUP approvals must be supported by substantial evidence when applicant meets the standards. Denial requires a substantial-evidence record.
Wis. Stat. §59.692; Wis. Admin. Code NR 115 — Shoreland Zoning Ceilingapplies
Qualifying condition
§59.692 and NR 115 require Rock County to adopt countywide shoreland zoning within 1,000 ft of navigable lakes/ponds/flowages or 300 ft of navigable rivers/streams. Rock County contains Rock River and other navigable waterways passing through or adjacent to Janesville. 2015 Act 55 inverted the regime: counties may NOT exceed NR 115 minimums on most dimensions. Janesville's Shoreland-Wetland Overlay (SW, Chapter 42 Article XV) must comply with NR 115 floor/ceiling constraints and may not exceed county shoreland standards.
Effect
Janesville's shoreland/wetland overlay standards are bounded by NR 115 ceiling; county standards govern over city for shoreland-adjacent properties. City SW overlay must meet NR 115 minimum but not exceed it.
2023 Wisconsin Acts 14, 15, 16, 17, 18 — More Housing Packageapplies
Qualifying condition
2023 Acts 14-18 signed June 22, 2023. Act 16 added §62.23(7e)(am) certiorari procedural preemption for residential development decisions (30-day window, substantial-evidence record review). Act 18: municipalities must permit ≥16-unit commercial-to-residential conversions by-right or by CUP (funding-conditional soft preemption). §66.10013 reporting compliance is a condition for WHEDA Residential Housing Infrastructure Revolving Loan Fund, Main Street Housing Rehab fund, Workforce Housing Rehab program, and Commercial-to-Residential Conversion fund eligibility. Janesville population 63,760 > 10,000 — all funding programs applicable; §66.10013 reporting obligation confirmed above.
Effect
Janesville residential development certiorari review constrained to Act 16 procedure. Commercial-to-residential conversions ≥16 units must be permitted by-right or CUP. Funding eligibility conditioned on §66.10013 compliance.

Adopted building codes

Modified as WI Uniform Dwelling Code

IBC
2021
IRC
2015 WI UDC
NEC
2017
IFC
2021
IECC (Residential)
2009
IECC (Commercial)
2021

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

Amendment history

DateKindCitation
2026-05-27retrieved atMunicode library.municode.com/wi/janesville returned HTTP 403 (Cloudflare) for all requests; supplemental PDFs retrieved from Janesville Laserfiche (cms.ci.janesville.wi.us) including 1999 annexation map legend and 2010 M1 amendment; chapter 18/42 dual numbering confirmed from Plan Commission memos and ZBA minutes
1981-01-01adoptionCity zoning ordinance originally adopted 1981; referenced in quirks notes and 2019 Building Division fee memo as Chapter 18 (city internal numbering); Municode codifies as Chapter 42

Quirks & notes

  • Dual chapter numbering: city's internal ordinance numbering uses Chapter 18 (e.g. §18.32.030 referenced in 2019 Building Division fee memo); Municode codification uses Chapter 42 (e.g. §42-356 referenced in ZBA minutes). Both appear in active city planning documents simultaneously.
  • Zoning ordinance originally adopted 1981. Comprehensive rewrite underway: GRAEF consultants engaged Spring 2024 to consolidate 23 current districts into 17 proposed; new code not yet adopted as of 2026-05-27.
  • Rezoning fee structure confirmed from 2019 Building Division memo (Laserfiche): R1/R2/Conservancy/Agricultural = $400; MF (R3/R3M/R4)/Office/Commercial/Industrial = $600. Fee tier is independent of dimensional standards.
  • Historic Preservation Commission established 1981 operates semi-independently. Specific cross-reference between Commission process and Chapter 42 Article/section not confirmed — Municode Cloudflare-blocked.
  • Airport Overlay District (AOZ) corresponds to Southern Wisconsin Regional Airport (FAA identifier KJVL), a general aviation airport on Janesville's east side. Not a commercial/military airport; AICUZ federal overlay not applicable.
  • Wisconsin §59.692 / NR 115 shoreland zoning ceiling applies: Rock County shoreland ordinance governs properties within 1,000 ft of navigable lakes/ponds/flowages and 300 ft of navigable rivers/streams; city's SW overlay cannot exceed county standards after 2015 Act 55.
  • Street-adjacent vegetation in setbacks: 30 inches maximum height confirmed for plants in required building setbacks along public streets (confirmed from supplemental Laserfiche document).
  • All base-district dimensional KPIs (lot sizes, heights, coverage, FAR, setbacks, parking, density) are unextracted due to Municode Cloudflare HTTP 403 blocking. Wayback Machine CDX found archived URLs but rendered SPA shell HTML without ordinance content. City website janesvillewi.gov planning pages also Cloudflare-blocked.

Formulas

Definitions

height
Grade to highest point of structure (Chapter 42 general definition; specific §-citation not extracted — Municode Cloudflare-blocked)
lot_coverage
Building footprint / lot area
far
Gross floor area / lot area
du_ac
Dwelling units per acre
setback_front
Front property line to nearest building face
setback_side
Side property line to nearest building face
setback_rear
Rear property line to nearest building face
parking
Spaces per dwelling unit

Capacity calculations

max_footprint_sf
lot_area_sf * lot_coverage
max_gfa_sf
lot_area_sf * far
max_units_from_density
lot_area_sf / 43560 * du_ac

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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Parking
— /unit
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Max density
— du/ac
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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] §CH42
  2. [2] §CH42
  3. [3] §CH42
  4. [4] §CH42
  5. [5] §CH42
  6. [6] §CH42
  7. [7] §CH42
  8. [8] §CH42
  9. [9] §CH42
  10. [10] §CH42
  11. [11] §CH42
  12. [12] §CH42
  13. [13] §CH42
  14. [14] §CH42
  15. [15] §CH42
  16. [16] §CH42
  17. [17] §CH42
  18. [18] §CH42
  19. [19] §CH42
  20. [20] §CH42
  21. [21] §CH42
  22. [22] §CH42
  23. [23] §CH42
  24. [24] §CH42
  25. [25] §CH42
  26. [26] §CH42
  27. [27] §CH42
  28. [28] §CH42
  29. [29] §CH42
  30. [30] §CH42
  31. [31] §CH42
  32. [32] §CH42
  33. [33] §CH42
  34. [34] §CH42
  35. [35] §CH42
  36. [36] §CH42
  37. [37] §CH42
  38. [38] §CH42
  39. [39] §CH42
  40. [40] §CH42
  41. [41] §CH42
  42. [42] §CH42
  43. [43] §CH42
  44. [44] §CH42
  45. [45] §CH42
  46. [46] §CH42
  47. [47] §CH42
  48. [48] §CH42
  49. [49] §CH42
  50. [50] §CH42
  51. [51] §CH42
  52. [52] §CH42
  53. [53] §CH42
  54. [54] §CH42
  55. [55] §CH42
  56. [56] §CH42
  57. [57] §CH42
  58. [58] §CH42
  59. [59] §CH42
  60. [60] §CH42
  61. [61] §CH42
  62. [62] §CH42
  63. [63] §CH42
  64. [64] §CH42
  65. [65] §CH42
  66. [66] §CH42
  67. [67] §CH42
  68. [68] §CH42
  69. [69] §CH42
  70. [70] §CH42
  71. [71] §CH42
  72. [72] §CH42
  73. [73] §CH42
  74. [74] §CH42
  75. [75] §CH42
  76. [76] §CH42
  77. [77] §CH42
  78. [78] §CH42
  79. [79] §CH42
  80. [80] §CH42
  81. [81] §CH42
  82. [82] §CH42
  83. [83] §CH42
  84. [84] §CH42
  85. [85] §CH42
  86. [86] §CH42
  87. [87] §CH42
  88. [88] §CH42
  89. [89] §CH42
  90. [90] §CH42
  91. [91] §CH42
  92. [92] §CH42
  93. [93] §CH42
  94. [94] §CH42
  95. [95] §CH42
  96. [96] §CH42
  97. [97] §CH42
  98. [98] §CH42
  99. [99] §CH42
  100. [100] §CH42
  101. [101] §CH42
  102. [102] §CH42
  103. [103] §CH42
  104. [104] §CH42
  105. [105] §CH42
  106. [106] §CH42
  107. [107] §CH42
  108. [108] §CH42
  109. [109] §CH42
  110. [110] §CH42
  111. [111] §CH42
  112. [112] §CH42
  113. [113] §CH42
  114. [114] §CH42
  115. [115] §CH42
  116. [116] §CH42
  117. [117] §CH42
  118. [118] §CH42
  119. [119] §CH42
  120. [120] §CH42
  121. [121] §CH42
  122. [122] §CH42
  123. [123] §CH42
  124. [124] §CH42
  125. [125] §CH42
  126. [126] §CH42
  127. [127] §CH42
  128. [128] §CH42
  129. [129] §CH42
  130. [130] §CH42
  131. [131] §CH42
  132. [132] §CH42
  133. [133] §CH42
  134. [134] §CH42
  135. [135] §CH42
  136. [136] §CH42
  137. [137] §CH42
  138. [138] §CH42
  139. [139] §CH42
  140. [140] §CH42
  141. [141] §CH42
  142. [142] §CH42
  143. [143] §CH42
  144. [144] §CH42
  145. [145] §CH42
  146. [146] §CH42
  147. [147] §CH42
  148. [148] §CH42
  149. [149] §CH42
  150. [150] §CH42
  151. [151] §CH42
  152. [152] §CH42
  153. [153] §CH42
  154. [154] §CH42
  155. [155] §CH42
  156. [156] §CH42
  157. [157] §CH42
  158. [158] §CH42

Research status

Publication gates

primary url presentpassedhttps://library.municode.com/wi/janesville/codes/code_of_ordinances?nodeId=COOR_CH42ZO — Municode URL present, https, not an aggregator domain
no aggregator citedpassedscan clean — no Zoneomics, Steadily, SitePlanGuide, SitePlanCreator, Propwire, Zonara, or Unzoned references
confidence tags full formfailedGate 3 fail: HD overlay confidence is 'i' (inferred) without a §-citation; all 19 district KPI fields carry 'p§CH42' partial confidence with null values — §CH42 is a chapter-level reference rather than a section-level §-citation. Full-form §\d+ citations require ordinance text extraction which is blocked by Municode Cloudflare HTTP 403.
overlays have parameters trigger confidencefailedGate 4 fail: AOZ and SW overlay params contain prose descriptions but specific numeric values (height maximums, setback distances) not extracted. HD overlay confidence is inferred ('i') not confirmed. Three absence-documented overlays (TOD-ABSENT, AH-ABSENT, COR-ABSENT) carry null trigger fields by design per absence-documentation pattern. Full overlay parameter extraction blocked by Municode Cloudflare HTTP 403.
preempt section city specificpassedWisconsin is not in the Gate-5 mandatory list (CA/TX/FL/OR/WA/CO/MN/MT/UT/AZ/NJ/CT). 7 Wisconsin preemption laws documented with city-specific qualifying_condition_checked in state_preemptions_applicable[].

Data quality

15%completeness5 confirmed171 partial1 inferred3 not found
Documented gaps
  • All base district dimensional KPIs: min_lot_sf, max_height_ft, lot_coverage, FAR, setbacks, parking, density for all 19 districts
  • Overlay parameter values for AOZ (height maximums, noise contours) and SW (specific setback distances, buffer widths)
  • Historic District Overlay §-citation within Chapter 42 (HD confidence currently inferred)
  • Confirmation of all 19 district names from Chapter 42 text (confirmed from map legend; formal ordinance text not extracted)

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