ICC Guideline 13 (G13)
G13 – High Density Multifamily Housing ("Middle Housing")
Abstract: The guideline will focus on interim solutions that designers, builders, and jurisdictions may implement using existing IBC provisions, as well as emerging concepts currently under consideration through the code development process. This guideline is intended to be a living document and will continue to evolve until the committee, in coordination with the BCAC, has achieved a sustained level of completeness in the corresponding IBC updates.
The committee will coordinate with the appropriate subgroup(s) of the BCAC and FCAC to ensure that relevant recommendations, updates, and proposed changes are appropriately advanced into the I-Codes.
The committee is governed by CP-33 Guideline Development
Committee Overview
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Active
MEETING INFO
G13 Meeting Notices
MEMBERSHIP
G13 Roster
DOCUMENTS
G13 Documents
SECRETARIAT
Kevin McOsker
Jacob Newton
Committee News
2026.03.20 | ICC Establishes the G13 Committee
ICC established a guideline to develop interim guidance associated with High-Density Multi-Family Housing ("Missing Middle"). While significant information pertaining to this housing type already exists in the IBC it is not always clear what sections apply and where to suggest updates during the code development process. This guideline committee will help facility this effort and feed suggestions for improvements to the I-Codes through the appropriate CACs and associated subgroups.
2026.02.20 | Addressing Middle Housing Through Building Codes
Demand for cost-effective housing options continues to grow across the United States. One housing type drawing increasing attention is small, multifamily buildings that fall outside the scope of the International Residential Code® (IRC), often referred to as “middle housing.” This category includes duplexes, triplexes, fourplexes and small apartment buildings that provide diverse and relatively affordable housing options for households across a wide range of incomes. (Associated BSJ Article)
2024.09.24 | The International Code Council’s Role in Code Development and Building Safety
Building and fire regulations within the U.S. originally grew out of local and regional codes. These codes have evolved into the I-Codes and the associated code development process of today. (Associated BSJ Article)
2023.12.11 | Commercial to Residential Conversions Encouraged by HUD
Building codes, including the Code Council's International Existing Building Code, can apply to adaptive reuse projects to ensure occupant safety. (Associated BSJ Article)
2022.02.11 | Significant changes to two-family dwelling separation in the 2021 International Residential Code
The change states that the prescribed fire-resistance-rated separation between two dwelling units in a single building is not affected by the presence of a lot line between the units. (Associated BSJ Article)
2020.02.15 | HUD proposes new rule recognizing additional building codes and standards to encourage more housing development
The U.S. Department of Housing and Urban Development (HUD) announced a proposed rule that would recognize additional sets of standards and model building code editions that, when followed in the design and construction of new multifamily housing, will ensure compliance with the accessibility requirements of the Fair Housing Act. (Associated BSJ Article)
2018.02.15 | Understanding Accessible, Type A, Type B, and Type C Units in the A117.1 Standard
There are four levels of accessibility for dwelling and sleeping units; from most to least requirements, that is accessible, Type A, Type B and Type C units. (Associated BSJ Article)
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