Zoning › Alabama › Madison County › Huntsville

Huntsville, AL Zoning

Euclidean-zoning. 34 districts · 4 overlays · 2 applicable state preemptions.

Overview

Code type
euclidean
Naming convention
lot-size-encoded

Classic euclidean ordinance organized by Article-per-district (Articles 10-90 range). Residence districts encode lot-size tiers (R-1=15,000sf, R-1-A=12,000sf, R-1-B=7,500sf, R-1-C=5,500sf, R-2=6,000sf, R-2-A/B/C variants). Commercial districts use C-1..C-6 plus C-B (Central Business). Notable: extensive Research Park district family (RP, RPW, RPA, RPC, RPA2, RP2) reflecting Cummings Research Park economic base. April 2026 supplement is the canonical current version.

Worth knowing
  • Huntsville is the largest city in Alabama as of 2024 Census estimate (~226k, surpassing Birmingham), driven by Redstone Arsenal / NASA Marshall Space Flight Center economy and Cummings Research Park growth.
  • Extensive Research Park district family (RP, RPW, RPA, RPC, RPA2, RP2) — six separate sub-districts in the 50-series — reflects the largest research park in the US by employment. No equivalent in any other AL city's code.
  • R-1 minimum lot of 15,000 sf (~1/3 acre) is generous by southeastern-US standards; R-1-C at 5,500 sf is the most compact SF district available without going to MF/townhouse.

+ 4 more in Quirks & notes

Districts

spec 10ind 7res_sf 6com 4res_th 2mu 2cbd 1off 1res_mf 1
CodeNameCategory Min lotHeight CoverageFAR Du/acParking Setbacks F/S/R
R-1Residence 1 Districtres_sf15,000 sf[4]35 ft[5]0.35[6]——2[7]40[1] / 15[2] / 45[3]
R-1-AResidence 1-A Districtres_sf12,000 sf[11]35 ft[12]0.35[13]——2[14]35[8] / 10[9] / 40[10]
R-1-BResidence 1-B Districtres_sf7,500 sf[18]35 ft[19]0.4[20]——2[21]30[15] / 8[16] / 35[17]
R-1-CResidence 1-C Districtres_sf5,500 sf[25]30 ft[26]0.4[27]——2[28]20[22] / 5[23] / 25[24]
R-2Residence 2 Districtres_sf6,000 sf[32]30 ft[33]0.4[34]——2[35]20[29] / 10[30] / 25[31]
R-2-AResidence 2-A Districtres_sf—[39]30 ft[40]0.35[41]——2[42]25[36] / 5[37] / 35[38]
R-2-BResidence 2-B Districtres_th—[46]45 ft[47]0.5[48]——2[49]20[43] / 0[44] / 25[45]
R-2-CResidence 2-C Districtres_th—[53]15 ft[54]—[55]——2[56]30[50] / 5[51] / 5[52]
C-1Neighborhood Business C-1 Districtcom—[60]50 ft[61]—[62]———5[57] / 0[58] / 0[59]
C-2Neighborhood Business C-2 Districtcom—[66]—[67]—————[63] / —[64] / —[65]
C-3General Business C-3 Districtcom—[71]—[72]—————[68] / —[69] / —[70]
C-4Highway Business C-4 Districtcom——[76]—————[73] / —[74] / —[75]
C-5Commercial Recreation C-5 Districtspec——[77]————— / — / —
C-BCentral Business C-B Districtcbd—[79]—[80]————0[78] / — / —
C-6Village Business C-6 Districtmu——[82]—————[81] / — / —
LILight Industry Districtind——[84]—————[83] / — / —
HIHeavy Industry Districtind——[85]————— / — / —
PIPlanned Industrial Districtind——[86]————— / — / —
AIPAirport Industrial Park Districtind——[87]————— / — / —
CIPCommercial Industrial Park Districtind——[88]————— / — / —
HMHeavy Manufacturing Districtind——[89]————— / — / —
IPIndustrial Park Districtind——[90]————— / — / —
RPResearch Park Districtspec——[92]————100[91] / — / —
RPWResearch Park West Districtspec——[93]————— / — / —
RPAResearch Park Applications Districtspec——[94]————— / — / —
RPCResearch Park Commercial Districtspec——[95]————— / — / —
RPA2Research Park Applications 2 Districtspec——[96]————— / — / —
RP2Research Park 2 Districtspec——[97]————— / — / —
MMedical Districtspec——[98]————— / — / —
M-2Medical 2 Districtspec——[99]————— / — / —
ROResidential Office Districtmu——[100]————— / — / —
OOffice Districtoff15,000 sf[101]30 ft[102]————— / — / —
PDPlanned Development Districtspec—[103]—[104]————— / — / —
PD-HPD-H: Planned Development-Housing Districtres_mf—[105]—[106]————— / — / —

Confidence: confirmed partial under review not found

Overlays

FH
Flood Hazard District
FP
Article 62

Areas mapped as Special Flood Hazard Area (SFHA) on FEMA Flood Insurance Rate Maps. Huntsville participates in NFIP.

basisNFIP — National Flood Insurance Program standards
elevation_freeboardPer FEMA + local floodplain regulations
permitsFloodplain Development Permit required prior to building permit for development in SFHA.
AONE
Airport Obstruction and Noise Exposure District
AP
Article 63

Properties within the airport obstruction zones and noise exposure contours surrounding Huntsville International Airport (HSV) and Redstone Airfield. FAA Part 77 surfaces apply.

height_capDetermined by approach/transition/horizontal/conical zones per Article 63 plus FAA Part 77 review.
noise_disclosureRequired for residential development in higher-DNL exposure zones.
AC
Airport Commercial District
AP
Article 64

Commercial uses on land adjacent to Huntsville International Airport that benefit from airport adjacency (hotel, rental car, FBO support services).

purposeProvide commercial frontage for airport-supportive uses while respecting AONE overlay.
SDD
Slope Development District
HS
Article 65

Properties on slopes of specified gradient (Article 65 defines triggering grade) — particularly Monte Sano, Huntsville Mountain, Green Mountain, and Madison Mountain slopes.

grade_thresholdDefined in §65.1 — applies on slopes of stated percentage.
additional_setbacksSetback additions required on downslope side per §65.2
coverage_reductionLot coverage reduced relative to slope class — exact factor per §65.2
geotechnical_reportRequired for development in SDD per §65.3

State preemptions

AL-11-52-75.1 (group home zoning)applies
Qualifying condition
Huntsville zoning ordinance has multi-family districts (R-2-B, R-2-C, RM-style under PD-H Art. 31). Group homes of 10 or fewer unrelated persons with intellectual disabilities or mental illness must be permitted in any multi-family district statewide per Ala. Code §11-52-75.1, subject to 1,000-ft lot-line spacing.
Source
Ala. Code §11-52-75.1; corroborated by zoning/us/alabama/preemptions.md
Effect
Local ordinance cannot exclude qualifying group homes from MF districts on the basis of non-family residency.
AL-HB281-2025 (Act 2025-331 — BZA appeal procedure)applies
Qualifying condition
Procedural preemption: every Huntsville BZA appeal filed after the effective date of Act 2025-331 (June 1, 2025) follows the new 30-day window, de novo review, no automatic stay procedure. Substantive zoning standards unchanged.
Source
Ala. Code §11-52-81 as amended by HB 281 (2025RS), Act 2025-331
Effect
Sets uniform BZA appeal mechanics; does not change what may be zoned.
Non-applicable laws (5)
AL-STR (short-term-rental local control)does_not_apply
Qualifying condition
No statewide STR preemption enacted as of 2026RS adjournment (April 9, 2026). Huntsville retains full Chapter 52 authority to regulate STRs. Per zoning/us/alabama/preemptions.md the 2024-STR-preemption claim is unconfirmed and treated as no_state_preemption.
Source
zoning/us/alabama/preemptions.md (April 2026 review); LegiScan AL 2026RS index
AL-MH (manufactured-housing zoning)does_not_apply
Qualifying condition
No state preemption of municipal zoning of manufactured housing. Ala. Code §40-12-255 governs taxation/registration of MH units, not their land-use siting. Huntsville may restrict MH to designated districts via Chapter 52 authority.
Source
Ala. Code §40-12-255; zoning/us/alabama/preemptions.md
AL-ADU (accessory dwelling units)does_not_apply
Qualifying condition
No statewide ADU mandate. Alabama is strict Dillon's Rule; the Legislature has not enacted any density/ADU preemption through 2026RS.
Source
zoning/us/alabama/preemptions.md (April 2026 review)
AL-DENSITY / AL-IZ / AL-DESIGN-REVIEWdoes_not_apply
Qualifying condition
No statewide density mandate, no inclusionary-zoning preemption (positive or negative), no statewide design-review preemption. Pure Dillon's Rule delegation through 2026RS.
Source
zoning/us/alabama/preemptions.md (April 2026 review)
AL-ACAMP (Alabama Coastal Area Management Program)does_not_apply
Qualifying condition
Huntsville is in Madison County (inland north Alabama). ACAMP applies only in Mobile and Baldwin counties (continuous 10-ft contour seaward to the 3-mile limit).
Source
zoning/us/alabama/preemptions.md (ACAMP section); Outdoor Alabama / ADCNR Coastal Programs

Adopted building codes

Statewide

IBC
2021
IRC
2021
NEC
2020
IFC
2021
IECC (Residential)
2015
IECC (Commercial)
2015

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

Amendment history

DateKindCitation
2026-05-18retrieved at
2026-04-01supplement effectiveUpdated to April 1, 2026 (Ord 26-157)
1963-03-21adoptionArticle 95 — Effective Date

Quirks & notes

  • Huntsville is the largest city in Alabama as of 2024 Census estimate (~226k, surpassing Birmingham), driven by Redstone Arsenal / NASA Marshall Space Flight Center economy and Cummings Research Park growth.
  • Extensive Research Park district family (RP, RPW, RPA, RPC, RPA2, RP2) — six separate sub-districts in the 50-series — reflects the largest research park in the US by employment. No equivalent in any other AL city's code.
  • R-1 minimum lot of 15,000 sf (~1/3 acre) is generous by southeastern-US standards; R-1-C at 5,500 sf is the most compact SF district available without going to MF/townhouse.
  • Article 75 (Alcoholic Beverage and Consumable Hemp Product Establishment Regulations) was amended April 1, 2026 by Ord 26-157 to add hemp-product regulations alongside alcohol — a 2026-distinct compliance window.
  • Article 78 (Community Homes) was added to align with §11-52-75.1 group-home preemption — Huntsville one of the early adopters of explicit group-home compliance code text.
  • AONE (Article 63) covers both Huntsville International Airport AND Redstone Airfield — dual military / civil aviation height controls overlap most of southwest Huntsville.
  • SDD (Slope Development District, Article 65) reflects Huntsville's topography — Monte Sano, Huntsville Mountain, and Green Mountain slopes are a distinctive geographic constraint not present in flatter AL cities.

Formulas

Definitions

height
Vertical distance from average finished grade to highest point of roof (Article 73 supplementary definitions); chimneys, antennas, mechanical penthouses excluded subject to §73.8 limits.
lot_coverage
Maximum total building area / lot area (referred to in code as 'maximum total building area' or 'maximum total area covered by buildings').
far
du_ac
Dwelling units per gross acre — not directly used; density expressed via minimum lot area per dwelling unit.
setback_front
Minimum required depth of front yard from the major-arterial centerline or local-street ROW edge per §73.15
setback_side
Minimum required width of each side yard; reduced when abutting alley per accessory-structure §73.8
setback_rear
Minimum required depth of rear yard.
parking
Spaces per unit/sf per use category (Article 70 schedule); modifies for shared parking in mixed-use C-6/multi-tenant settings via Article 27.

Capacity calculations

max_footprint_sf
lot_area_sf * lot_coverage
max_units_per_lot_sf
lot_area_sf / minimum_lot_area_per_unit
buildable_width_ft
lot_width_ft - setback_side_ft * 2
buildable_depth_ft
lot_depth_ft - setback_front_ft - setback_rear_ft

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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District Category Height FAR Coverage Setbacks Parking Density Min lot Overlays

Sources & references

Citations
  1. [1] §10.2.4
  2. [2] §10.2.6
  3. [3] §10.2.5
  4. [4] §10.2.1
  5. [5] §10.2.9
  6. [6] §10.2.7
  7. [7] §70 (single-family two-space minimum)
  8. [8] §11.2
  9. [9] §11.2
  10. [10] §11.2
  11. [11] §11.2.1
  12. [12] §11.2
  13. [13] §11.2
  14. [14] §70
  15. [15] §12.2
  16. [16] §12.2
  17. [17] §12.2
  18. [18] §12.2.1
  19. [19] §12.2
  20. [20] §12.2
  21. [21] §70
  22. [22] §16.2
  23. [23] §16.2
  24. [24] §16.2
  25. [25] §16.2
  26. [26] §16.2
  27. [27] §16.2
  28. [28] §70
  29. [29] §13.2
  30. [30] §13.2
  31. [31] §13.2
  32. [32] §13.2
  33. [33] §13.2
  34. [34] §13.2
  35. [35] §70
  36. [36] §14.2
  37. [37] §14.2
  38. [38] §14.2
  39. [39] §14.2
  40. [40] §14.2
  41. [41] §14.2
  42. [42] §70
  43. [43] §15.2
  44. [44] §15.2
  45. [45] §15.2
  46. [46] §15.2
  47. [47] §15.2
  48. [48] §15.2
  49. [49] §70
  50. [50] §17.2
  51. [51] §17.2
  52. [52] §17.2
  53. [53] §17.2
  54. [54] §17.2
  55. [55] §17.2
  56. [56] §70
  57. [57] §20.2(1)
  58. [58] §20.2(4)
  59. [59] §20.2(3)
  60. [60] n
  61. [61] §20.2(5)
  62. [62] n
  63. [63] §22.2
  64. [64] §22.2
  65. [65] §22.2
  66. [66] n
  67. [67] §22.2
  68. [68] §23.2
  69. [69] §23.2
  70. [70] §23.2
  71. [71] n
  72. [72] §23.2
  73. [73] §24.2
  74. [74] §24.2
  75. [75] §24.2
  76. [76] §24.2
  77. [77] §25.2
  78. [78] §26.2
  79. [79] n
  80. [80] §26.2
  81. [81] §27.2
  82. [82] §27.2
  83. [83] §40
  84. [84] §40
  85. [85] §41
  86. [86] §42
  87. [87] §43
  88. [88] §44
  89. [89] §45
  90. [90] §46
  91. [91] §50.2
  92. [92] §50
  93. [93] §51
  94. [94] §52
  95. [95] §53
  96. [96] §54
  97. [97] §55
  98. [98] §60
  99. [99] §66
  100. [100] §80
  101. [101] §81
  102. [102] §81
  103. [103] n
  104. [104] n
  105. [105] n
  106. [106] n

Research status

Publication gates

primary url presentpassedDirect city-hosted PDF at huntsvilleal.gov, current as of April 2026 supplement.
no aggregator citedpassedOnly city-hosted PDF, city planning page, and state preemption MD cited.
confidence tags full formpassedAll confirmed KPI values carry §Article-level citations. Partial-status fields carry search_performed or reason per FM-7 discipline.
overlays have parameters trigger confidencepassedEach overlay records ordinance section, trigger, params, base_interaction, and confidence code.
preempt section city specificpassedAll AL preemption laws evaluated with city-specific qualifying_condition_checked. §11-52-75.1 active in MF districts; ACAMP non-applicable (Madison County); STR/MH/ADU/Density/IZ/Design-Review all no-state-preemption.

Data quality

62%completeness32 confirmed45 partial1 not found
Documented gaps
  • Commercial/Industrial dimensional tables Articles 22-27, 40-46 use prose-rule schemas (conditional rear/side setbacks abutting residential) — partial values captured; full per-condition matrices require follow-up extraction.
  • Research Park 50-series dimensional standards each have campus-specific minimums in Article 50-55; partial extraction in this drain.
  • Affordable-housing density bonus does not exist in Huntsville code (Alabama lacks state mandate; Huntsville has not adopted local bonus).

Other cities in this state

Nearest-alphabetical profiles. Click through to compare zoning patterns side-by-side.

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