State Residential Building Code – 2018 IRC and Appendix Q

Home Rule State, Colorado


Name State Residential Building Code – 2018 IRC and Appendix Q
Municipality Home Rule State
Zoning Districts Residential
Effective Date 09/14/2020
Municipal Code Building Codes & Standards
Code Link
Authority Office of Regulatory Oversight and the Department of Local Affairs - Division of Housing


The Office of Regulatory Oversight (ORO) oversees the regulatory functions of the Division of Housing. Specifically, state laws and rules governing the:

  1.    Construction of factory-built structures (residential and nonresidential);  2.
  2.    Sale and installation of manufactured homes; 
  3.    Site built construction of hotels, motels, and multi-family units in those areas of the state where no local building department exists;
  4.    Standards for accessible housing; and   
  5.    Mobile home parks.   

ORO is comprised of two parts:  Building Codes & Standards Section and the Mobile Home Park Act Dispute Resolution & Enforcement Program.

Building Codes & Standards Section regulates the areas covered under #s 1-4.  Click on the Building Codes & Standards Section link and then click on Administrative Rules.  Page 10 says the Department of Local Affairs – Division of Housing has adopted the 2018 IRC with Appendix Q.

Mobile Home Park Oversight Program regulates mobile home parks.

Regulation occurs in partnership with local governments, the federal government, other state agencies, nonprofits, and the private sector

Key Contacts

Department of Local Affairs – Division on Housing
Manufactured or Factory-Built Structures
(303) 864-7836



Updated:  April 2021 – Loran

THIA will be constantly updating the legislation data. Check back often. Suggest A Correction if you are aware of any missing or incorrect information. AND keep scrolling to learn more about getting guidance.



Building Code — Legislation that speaks to how to construct a tiny house.

Zoning Code — Legislation that speaks to how the lot will be used.


ADU — Accessory Dwelling Unit

DMV — Division of Motor Vehicles

IB — Industrialized Buildings

IRC — International Residential Code

PUD — Planned Unit Development

RV — Recreational Vehicle

SF — Single Family Dwelling

T — Transitional Housing

UDO — Unified Development Ordinance

Please Suggest a Correction if you find broken links or misinformation.

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