About IIBC

Our history

Interstate Industrialized Buildings Commission (IIBC) was created in 1992 when the states of Minnesota, New Jersey and Rhode Island enacted the Interstate Compact for Industrialized/Modular Buildings. IIBC, which is responsible for carrying out the activities of the compact, is comprised of governor-appointed state officials from the member states and a representative from the industrialized (modular) buildings industry.

North Dakota became the fourth state to join the compact when Governor Jack Dalrymple signed Senate Bill 2284 into law on April 19, 2011. North Dakota had entered into an interim reciprocity agreement with IIBC effective August 1, 2003 which allows a state to participate in the IIBC program prior to becoming a full member.

The purpose of the compact is to promote and assure reciprocal recognition of states’ industrialized buildings programs through effective implementation of uniform rules and regulations. It streamlines regulations that govern industrialized (modular) buildings — from the design and manufacture to delivery and installation — and eliminates overlapping and costly reviews and inspections by multiple jurisdictions. The coordinating compact enables member states to improve efficiency and reduce costs by consolidating similar services as they continue to operate, staff and enforce their industrialized (modular) buildings programs. Improved compliance through uniform rules, regulations and procedures; better enforcement through sharing of information and findings; and reduced costs through elimination of redundant reviews and inspections are just some of the compact’s benefits.

The compact’s rules, regulations and procedures are developed by the Rules Development Committee (RDC) and recommended to the Commission for adoption. RDC is a consensus-based committee with representatives from state governments, consumers, residential and commercial manufacturers, and private evaluation and inspection agencies.

State of Wisconsin has a separate agreement with the State of Minnesota that allows industrialized (modular) buildings manufactured in Minnesota and bearing an IIBC certification label to be sited in Wisconsin.

IIBC Secretariat maintains an office with a full-time staff in Northern Virginia. Prior to May 2011, support services were provided by National Conference of States on Building Codes and Standards (NCSBCS).

Legislation & Bylaws

To become a member, a state must enact the Interstate Compact on Industrialized/Modular Buildings. An interim reciprocity agreement enables a state to participate in the program until the Compact is enacted. Refer to the bylaws for additional details.
View Legislation PDFView Bylaws PDF

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Production Trend

Monthly figures of modules manufactured and the 12-month moving average.

State Activity

Origin and destination of the modules manufactured in the last four calendar-quarters. Nearly 180,000 modules have been manufactured in facilities located in 54 states and Canadian provinces since the program became mandatory in 1996.


Main Office

505 Huntmar Park Drive, Ste. 210, Herndon, VA 20170(703) 481-2022(703) 481-3596



Department of Labor & Industry
Construction Codes and Licensing Division


Rhode Island

Department of Administration
Building Code Commission


New Jersey

Department of Community Affairs
Division of Codes & Standards


North Dakota

Department of Commerce
Division of Community Services