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Building codes by state

Which residential code applies in each state, and since when.

Last checked

On this page
  1. Residential code by state
  2. Code requirements explained
  3. Sources

A building code sets how a house must be built: structure, fire safety, stairs, egress windows, electrical, plumbing and energy. Most states and cities adopt the model codes published by the International Code Council and the NFPA, often with their own amendments, and enforce them through permits and inspections.

Some states adopt one code for everywhere; others set a minimum and let cities go further; a few leave adoption to cities and counties. The table shows the residential code each state has adopted, with its effective date, from the state agency, register or statute.

Residential code by state

StateResidential code as adoptedEffectiveHow it applies
AlabamaAlabama Residential Building Code11Statewide minimum; local governments may go further2
AlaskaNo statewide IRC row; see the state page––
ArizonaNo statewide IRC row; see the state page––
Arkansas2021 Arkansas Fire Prevention Code, Volume III34Statewide minimum; local governments may go further4
CaliforniaPart 2.5 California Residential Code56Statewide minimum; local governments may go further7
ColoradoNo statewide IRC row; see the state page––
Connecticut2021 International Residential Code portion of the 2022 Connecticut State Building Code89Statewide; applies everywhere10
DelawareInternational Residential Code, 2024 edition1111Adopted locally12
District of ColumbiaDistrict of Columbia Residential Code (2017)1314Statewide; applies everywhere15
Florida8th Edition (2023) Florida Building Code, Residential1617Statewide minimum; local governments may go further18
GeorgiaNo statewide IRC row; see the state page––
HawaiiHAWAII STATE RESIDENTIAL CODE1919Statewide; applies everywhere20
Idaho2018 International Residential Code (parts I, II, III and IX), with Idaho amendments collectively named the Idaho Residential Code (2020 Edition)2122Statewide minimum; local governments may go further23
IllinoisIRC2424Statewide minimum; local governments may go further25
Indiana2020 Indiana Residential Code2626Statewide; local amendments not allowed27
IowaNo statewide IRC row; see the state page––
KansasThe 2018 edition of the international residential code (IRC)2829Adopted locally30
Kentucky2018 Kentucky Residential Code (Based on the 2015 International Residential Code)3132Statewide; local amendments not allowed33
LouisianaInternational Residential Code, 2021 Edition, not including Parts I-Administrative, and VIII-Electrical.3435Statewide; applies everywhere34
MaineMAINE UNIFORM BUILDING AND ENERGY CODE - RESIDENTIAL BUILDING CODE FOR ONE AND TWO-FAMILY DWELLINGS IN MAINE36–Statewide; applies everywhere37
Maryland2021 International Residential Code for One- and Two-Family Dwellings3839Statewide; applies everywhere40
Massachusetts780 CMR 51.00: Massachusetts Residential Code4142Statewide; applies everywhere41
MichiganMichigan residential code for 1- and 2-family dwellings4343Statewide; applies everywhere44
Minnesota2020 Minnesota Residential Code4546Statewide; applies everywhere47
MississippiInternational Residential Code (IRC)4848Adopted locally49
MissouriInternational Residential Code for One- and Two-Family Dwellings50–Adopted locally50
MontanaNo statewide IRC row; see the state page––
NebraskaInternational Residential Code, 2018 version51–Adopted locally51
NevadaNo statewide IRC row; see the state page––
New HampshireNo statewide IRC row; see the state page––
New JerseyInternational Residential Code/2024, NJ ed5253Statewide; applies everywhere54
New Mexico2021 New Mexico Residential Building Code5555Statewide minimum; local governments may go further56
New York2025 Residential Code of New York State5757Statewide minimum; local governments may go further58
North Carolina2018 North Carolina Residential Code (2015 IRC base)5959Statewide; applies everywhere60
North DakotaNorth Dakota State Building Code: 2024 International Residential Code6162Adopted locally63
OhioResidential Code of Ohio (RCO)6465Statewide; applies everywhere64
OklahomaInternational Residential Code®, 2024 Edition (IRC® 2024), as amended by OAC 748:20-66666Statewide minimum; local governments may go further66
Oregon2026 Oregon Residential Specialty Code (ORSC)6767Statewide; applies everywhere68
PennsylvaniaInternational Residential Code of 20216969Statewide minimum; local governments may go further69
Rhode IslandRhode Island One & Two-Family Dwelling Code (IRC 2021 with RI amendments)7070Statewide; applies everywhere70
South Carolina2021 International Residential Code with SC modifications7171Statewide; applies everywhere72
South Dakota2024 International Residential Code7374Adopted locally73
TennesseeInternational Residential Code (IRC), 2018 edition, and Appendix Q7575Statewide minimum; local governments may go further75
TexasInternational Residential Code, as it existed on May 1, 20127676 (statute’s current text)Set by state statute for cities76
Utah2021 International Residential Code77–Statewide; local amendments not allowed78
VermontNo statewide IRC row; see the state page––
Virginia2021 International Residential Code as referenced in the VCC ("VRC")7980Statewide; applies everywhere81
WashingtonInternational Residential Code, 2021 edition, without chapters 11 and 25-43; Appendices AF, AQ and AWU included8282Statewide minimum; local governments may go further83
West Virginia2018 International Residential Code for One- and Two-Family Dwellings (with WV amendments; IRC Chapter 11 not adopted)8484Adopted locally85
WisconsinNo statewide IRC row; see the state page––
WyomingIRC incorporated only as referenced in chapters 1-10 of the IBC, IFC, IMC and IFGC86–Adopted locally87

Code requirements explained

Sources

  1. Chapter 465-X-10 Alabama Residential Building Code (Certification)State of Alabama, Home Builders Licensure Board (certified filing, Legislative Services Agency, Administrative Procedure Division)Adopted October 20, 2026Checked November 5, 2026
  2. Section 34-14A-12 Standards of Practice; Building Laws and Codes.State of Alabama, Code of Alabama 1975 (Alabama Legislature, ALISON)Checked November 7, 2026
  3. Building CodesCity of Bentonville, ArkansasChecked November 5, 2026
  4. 2021 Arkansas Fire Prevention Code Rules ChangesArkansas Department of Public Safety, Division of Arkansas State Police, State Fire MarshalPosted April 27, 2022Checked November 5, 2026
  5. Guide to Title 24, 6th EditionCalifornia Department of General Services, Building Standards CommissionPublished July 2025Checked November 7, 2026
  6. CodesCalifornia Department of General Services, Building Standards CommissionChecked November 5, 2026
  7. Health and Safety Code Section 18938California Legislature, Legislative Information (leginfo) public data downloadEffective January 1, 2018Checked November 7, 2026
  8. 2022 Connecticut State Building Code (w/ Errata #1)State of Connecticut, Department of Administrative Services, Office of the State Building InspectorEffective October 1, 2022Checked November 7, 2026
  9. Connecticut State Building Code - RegulationsState of Connecticut, Department of Administrative Services, Office of the State Building InspectorChecked November 5, 2026
  10. Chapter 541 - Building, Fire and Demolition CodesState of Connecticut, General Assembly (Connecticut General Statutes)Revised January 1, 2025Checked November 7, 2026
  11. County Laws & CodeNew Castle County, DelawareChecked November 7, 2026
  12. 16 Del. C. ch. 76, County or Municipal Building, Plumbing, Electrical and Other CodesState of Delaware, Delaware Code OnlineChecked November 5, 2026
  13. 12-A DCMR § 101 GeneralDistrict of Columbia, Office of Documents and Administrative Issuances (D.C. Municipal Regulations)Effective May 29, 2020Checked November 5, 2026
  14. DC Construction CodesDistrict of Columbia, Department of BuildingsChecked November 7, 2026
  15. § 6-1403. Scope.District of Columbia, Council of the District of Columbia (Code of the District of Columbia)Checked November 5, 2026
  16. Analysis of Changes for the 8th Edition (2023) Florida Codes: ResidentialState of Florida, Department of Business and Professional Regulation, Florida Building CommissionChecked November 7, 2026
  17. Florida Building Commission home page (BCIS)State of Florida, Department of Business and Professional Regulation, Florida Building CommissionChecked November 7, 2026
  18. Fla. Stat. § 553.73 (2026 Florida Statutes)State of Florida, The Florida Senate (Florida Statutes)Published 2026Checked November 7, 2026
  19. Hawaii State Residential CodeState of Hawaii, Department of Accounting and General Services, State Building Code CouncilAdopted November 17, 2020Checked November 5, 2026
  20. HRS 107-25State of Hawaii, Hawaii Revised Statutes (Legislature)Checked November 5, 2026
  21. Idaho Adopted CodesState of Idaho, Division of Occupational and Professional Licenses, Building ProgramChecked November 5, 2026
  22. IDAPA 24.39.30, Rules of Building Safety (Building Code Rules)State of Idaho, Idaho Administrative Code (IDAPA), Idaho Building Code BoardChecked November 7, 2026
  23. Idaho Code § 39-4116State of Idaho, Idaho LegislatureChecked November 5, 2026
  24. Building Codes and RegulationsState of Illinois, Capital Development BoardChecked November 5, 2026
  25. Illinois Codes FAQState of Illinois, Capital Development BoardChecked November 7, 2026
  26. Rules of the Indiana Fire Prevention and Building Safety CommissionState of Indiana, Department of Homeland SecurityChecked November 5, 2026
  27. Boards and Commissions (Fire Prevention and Building Safety Commission section)State of Indiana, Department of Homeland SecurityChecked November 5, 2026
  28. 2026 Senate Bill No. 418 (enrolled), by-right housing development actKansas LegislatureAdopted April 7, 2026Checked November 7, 2026
  29. 2026 Composite Listing of New, Amended & Repealed Statutes (K.S.A. Order)Kansas Office of Revisor of StatutesPublished August 13, 2026Checked November 5, 2026
  30. K.S.A. 12-3009Kansas Office of Revisor of Statutes, Kansas Statutes AnnotatedEffective April 25, 1969Checked November 5, 2026
  31. Codes Currently Adopted by KentuckyCommonwealth of Kentucky, Department of Housing, Buildings and ConstructionChecked November 6, 2026
  32. 815 KAR 7:125, Kentucky Residential CodeKentucky Legislative Research Commission, Kentucky Administrative RegulationsEffective December 3, 2024Checked November 6, 2026
  33. 2018 Kentucky Residential Code, Third EditionCommonwealth of Kentucky, Department of Housing, Buildings and ConstructionPublished August 2024Checked November 7, 2026
  34. Building Code Adoption & Inspector Licensing Law and Rules and RegulationsState of Louisiana, Louisiana Uniform Construction Code CommissionPublished August 1, 2026Checked November 7, 2026
  35. State of Louisiana Uniform Construction CodeState of Louisiana, Louisiana Uniform Construction Code CommissionRevised August 6, 2026Checked November 5, 2026
  36. Ch. 6 MUBEC - Residential Building Code for One and Two-Family Dwellings in MaineMaine Secretary of State, Agency Rules (08-003 C.M.R., Maine Office of Community Affairs, Building Codes and Standards)Revised March 4, 2025Checked November 7, 2026
  37. Ch. 2 MUBEC - Administrative ProceduresMaine Secretary of State, Agency Rules (08-003 C.M.R., Maine Office of Community Affairs, Building Codes and Standards)Revised July 22, 2026Checked November 7, 2026
  38. COMAR 09.12.51, Maryland Building Performance StandardsMaryland Department of Labor, Division of Labor and Industry, Building Codes AdministrationEffective May 29, 2023Checked November 5, 2026
  39. Frequently Asked QuestionsMaryland Department of Labor, Division of Labor and Industry, Building Codes AdministrationChecked November 5, 2026
  40. Md. Code, Public Safety § 12-505Maryland General Assembly, Annotated Code of MarylandChecked November 7, 2026
  41. 780 CMR 51.00 Massachusetts Residential Code, Chapter R1 Scope and Application (10th ed., unofficial copy)Commonwealth of Massachusetts, Board of Building Regulations and StandardsChecked November 7, 2026
  42. Tenth Edition CMR 780Commonwealth of Massachusetts, Board of Building Regulations and StandardsPublished October 11, 2024Checked November 7, 2026
  43. Construction Codes Part 5. Residential Code (R 408.30500 to 408.30547g)State of Michigan, Michigan Office of Administrative Hearings and Rules, Michigan Administrative Code (Bureau of Construction Codes rules)Effective February 8, 2022Checked November 7, 2026
  44. Stille-DeRossett-Hale Single State Construction Code Act, Act 230 of 1972Michigan Legislature, Michigan Compiled LawsLast updated May 23, 2026Checked November 8, 2026
  45. 2020 Minnesota State Building CodesMinnesota Department of Labor and IndustryChecked November 6, 2026
  46. Code book fact sheet: 2020 Minnesota Residential CodeMinnesota Department of Labor and IndustryChecked November 6, 2026
  47. Minn. Stat. § 326B.121 State Building Code; application and enforcementMinnesota Office of the Revisor of Statutes, Minnesota StatutesPublished 2026Checked November 6, 2026
  48. SB 2378 (As Sent to Governor), 2014 Regular SessionMississippi LegislatureEffective August 1, 2014Checked November 6, 2026
  49. Mississippi Uniform Building CodesMississippi Insurance Department, Office of the State Fire MarshalChecked November 6, 2026
  50. RSMo Section 67.281Missouri General Assembly, Revisor of StatutesEffective August 28, 2016Checked November 6, 2026
  51. Building code updatedNebraska Legislature, Unicameral UpdatePosted April 11, 2019Checked November 6, 2026
  52. Current Construction CodesNJ Department of Community Affairs, Division of Codes and StandardsChecked November 6, 2026
  53. 58 NJR 8(2), Adopted Amendments N.J.A.C. 5:23-3.14 to 3.22NJ Department of Community Affairs, Division of Codes and StandardsEffective August 17, 2026Checked November 6, 2026
  54. Bureau of Construction Project ReviewNJ Department of Community Affairs, Division of Codes and StandardsChecked November 6, 2026
  55. 14.7.3 NMAC 2021 New Mexico Residential Building CodeNew Mexico Administrative Code (State Records Center and Archives)Effective July 14, 2023Checked November 6, 2026
  56. Chapter 60, Article 13 NMSA 1978, Construction Industries Licensing ActNew Mexico Compilation Commission, NMOneSource (NMSA 1978 Unannotated)Last updated November 4, 2026Checked November 7, 2026
  57. Notice of Adoption | Department of StateNew York Department of State, Division of Building Standards and CodesChecked November 6, 2026
  58. NY Executive Law § 379 (Laws of New York, NY Senate Open Legislation PDF)New York State Legislature (NY Senate Open Legislation)Checked November 6, 2026
  59. Codes - Current and Past | OSFMNorth Carolina Department of Insurance, Office of State Fire Marshal (OSFM), Engineering DivisionChecked November 6, 2026
  60. Codes | OSFMNorth Carolina Department of Insurance, Office of State Fire Marshal (OSFM), Engineering DivisionChecked November 6, 2026
  61. North Dakota State Building Code (effective January 1, 2026)North Dakota Department of Commerce, Division of Community ServicesEffective January 1, 2026Checked November 6, 2026
  62. Building Codes | Commerce | North DakotaNorth Dakota Department of Commerce, Division of Community ServicesChecked November 6, 2026
  63. N.D.C.C. Chapter 54-21.3 State Building CodeNorth Dakota Legislative BranchChecked November 6, 2026
  64. 2019 Residential Code of Ohio Building Department Resource PackageState of Ohio, Department of Commerce, Board of Building StandardsPublished July 2019Checked November 7, 2026
  65. OAC 4101:8-34-01 Electrical (RCO Chapter 34), effective 4/15/2024State of Ohio, Department of Commerce, Board of Building StandardsEffective April 15, 2024Checked November 6, 2026
  66. OAC Title 748, Chapter 20: IRC 2024 Permanent Rule (OUBCC unofficial copy)Oklahoma Uniform Building Code Commission (OUBCC)Effective September 14, 2026Checked November 6, 2026
  67. Development Services Newsletter | October 2026City of Corvallis, Development ServicesPublished October 2026Checked November 6, 2026
  68. Chapter 455 — Building Code (Oregon Revised Statutes)Oregon State Legislature, Oregon Revised StatutesChecked November 8, 2026
  69. 34 Pa. Code § 403.21. Uniform Construction Code.Pennsylvania Code & Bulletin (Legislative Reference Bureau), official full-text Pennsylvania CodeEffective January 1, 2026Checked November 6, 2026
  70. RISBC-2 Rhode Island State One and Two Family DwellingsState of Rhode Island, Department of State (Rhode Island Code of Regulations), Building Code Commission / Building Code Standards CommitteeEffective December 1, 2025Checked November 6, 2026
  71. Adopted Building CodesCity of Aiken, SCChecked November 6, 2026
  72. S.C. Code of Regulations, Chapter 8: Building Codes CouncilSouth Carolina General Assembly, Legislative Council (Code of Regulations)Checked November 6, 2026
  73. SDCL 11-10-12South Dakota Legislature, Legislative Research CouncilChecked November 5, 2026
  74. SDCL 2-14-16South Dakota Legislature, Legislative Research CouncilChecked November 5, 2026
  75. Rules, Chapter 0780-02-23 One and Two Family Dwellings and TownhousesTennessee Secretary of State, Division of PublicationsRevised September 2026Checked November 7, 2026
  76. Local Government Code Chapter 214. Municipal Regulation of Housing and Other StructuresTexas Legislative Council, Texas Constitution and Statutes (statutes.capitol.texas.gov)Effective January 1, 2022Checked November 7, 2026
  77. Utah Code 15A-2-103, Specific editions adopted of construction code of a nationally recognized code authorityState of Utah, Utah State Legislature (Utah Code)Effective July 1, 2026Checked November 6, 2026
  78. Utah Code 15A-1-204, Adoption of State Construction Code -- Amendments by commission -- Approved codes -- ExemptionsState of Utah, Utah State Legislature (Utah Code)Effective November 6, 2025Checked November 6, 2026
  79. 13VAC5-63-10. Section 101 GeneralCommonwealth of Virginia, Division of Legislative Automated Systems (Virginia Administrative Code)Effective January 18, 2024Checked November 7, 2026
  80. Codes | DHCDVirginia Department of Housing and Community Development (DHCD)Checked November 7, 2026
  81. § 36-98. Board to promulgate Statewide Code; other codes and regulations superseded; exceptionsCommonwealth of Virginia, Division of Legislative Automated Systems (Virginia Law, Code of Virginia)Checked November 7, 2026
  82. WAC 51-51-003 International Residential CodeWashington State Legislature, Washington Administrative Code (State Building Code Council rules)Effective March 16, 2024Checked November 6, 2026
  83. Chapter 19.27 RCW, State Building CodeWashington State Legislature, Revised Code of WashingtonChecked November 7, 2026
  84. 87 CSR 4 State Building Code (Final File, effective 8/1/2022)West Virginia State Fire Commission (rule filed with the West Virginia Secretary of State)Effective August 1, 2022Checked November 6, 2026
  85. W. Va. Code §7-1-3n Authority of certain counties as to building and housing codes; state building codeWest Virginia LegislatureChecked November 6, 2026
  86. Council on Fire Prevention and Electrical Safety in Buildings Rules, Chapter 1 General ProvisionsWyoming Council on Fire Prevention and Electrical Safety in BuildingsChecked November 6, 2026
  87. Wyoming Statutes Title 35 Public Health and Safety (Chapter 9, Article 1)Wyoming Legislature, Legislative Service OfficeChecked November 7, 2026