What Are Building Codes and Why Do They Change
Building codes set the minimum standards for design, construction, and maintenance of structures. They protect public safety while creating uniformity in construction methods and materials. In the United States, regulations governing building have existed since colonial times, but they gained real importance with the growth of cities and the insurance industry in the early 20th century. Today, understanding building codes and standards is essential for every professional in the construction industry.
Since the 1990s, the International Code Council has been the primary organization responsible for developing and revising model building codes. The ICC is a nonprofit whose membership of over 50,000 includes architects, engineers, builders, code officials, manufacturers, and others connected to the construction industry. Codes developed by the ICC, called I-Codes, serve as model codes. They have no legal standing until adopted as law by a state legislature, county board, or city council.
The ICC currently publishes 15 different model codes, including:
- International Building Code (IBC) applies to commercial and multi-family buildings
- International Residential Code (IRC) governs one- and two-family dwellings
- International Energy Conservation Code (IECC) sets energy efficiency requirements
- International Fire Code (IFC) addresses fire prevention and life safety
- International Existing Building Code (IEBC) covers renovation and alteration work
These codes are interrelated, cite common standards, and are updated every three years through a specific process. Each cycle, the ICC receives roughly 2,000 suggested code changes. Of those, about 900 will ultimately become part of the new code edition.
How the ICC Code Change Process Works
The code development cycle follows a structured timeline spanning more than two years. Understanding this process helps builders and designers anticipate when changes will take effect and how to participate in shaping them.
Step 1: Committee Formation
Around June of each cycle, the ICC accepts applications from individuals who wish to serve on its 19 code committees. The ICC Codes and Standards Council, made up of experienced participants in the code process, reviews these applications and recommends appointments to the ICC board of directors. Committee members come from diverse backgrounds and can include consumers, builders, academics, manufacturers, and representatives of testing laboratories. At least one-third of each committee must consist of code officials or regulators.
Step 2: Code Change Submissions
The deadline for submitting code changes falls just after the start of the year. Any interested individual or group may propose a change, but all submissions must follow a specific format established by the ICC. Each proposal must include:
- The reason for the proposed change
- Supporting technical information and data
- A statement of cost impact on construction
- The specific code sections affected
ICC staff review all submissions for consistency and compliance with submission guidelines before the proposals move forward.
Step 3: Public Hearings
In late April or early May, code change proposals are debated in public hearings. Each code committee presides over hearings for the code sections it oversees. Following open debate on each proposal, committee members vote to adopt, modify, or reject the change. These development hearings can last up to 10 days. In rare cases, ICC members who disagree with a committee decision can challenge it with a two-thirds vote, though the committee decision takes precedence in most situations.
Step 4: Public Comment Period
About 30 days after the hearing, the ICC publishes a Report of Public Hearing documenting the action taken on each proposal. The public then has approximately 60 days to submit comments challenging committee decisions. Comments are submitted through the ICC website and reviewed by staff.
Step 5: Final Action Hearings
Whether a proposed change becomes code is decided at the final action hearing. Code officials vote first to accept committee decisions on all changes that received no public comment. After that, individual votes are taken on each change that received public comment or a successful assembly action. Each side gets two minutes for presentation, followed by one-minute rebuttals. Final action hearings take four to five days and coincide with the ICC annual conference in the fall.
Step 6: Appeals and Publication
Code change decisions can be appealed following final action, but appeals can only address procedural matters, not the substance of the change. There are typically one or two appeals per cycle, and they are rarely successful. The updated code is then published in print and electronic formats.
Who Influences Code Changes and Why
While building safer structures is the stated goal, many different interests drive code change proposals. Manufacturers looking to promote new products, builders seeking methods that speed construction or reduce costs, government officials responding to political pressure, and building inspectors aiming to simplify enforcement all participate in the process.
The ICC uses a governmental consensus process, meaning any interested individual or group can propose a change and participate in the proceedings. This broad cross section of opinions ensures that the codes reflect a consensus across the construction community rather than any single interest group.
| Stakeholder Group | Primary Motivation | Typical Code Focus |
|---|---|---|
| Builders and Contractors | Cost-effective, practical methods | Framing, fastening, installation efficiency |
| Manufacturers | Product approval and market access | Material standards, new technologies |
| Code Officials | Enforcement clarity and safety | Life safety, structural integrity |
| Architects and Engineers | Design flexibility and performance | Structural design, energy performance |
| Fire Officials | Fire prevention and suppression | Fire ratings, sprinklers, egress |
| Consumer Advocates | Affordability and accessibility | Universal design, energy costs |
The Role of Scoping
In many cases, sections of two or more different I-Codes address the same subject. Fire sprinklers, for example, appear in both the International Fire Code and the International Building Code. When a conflict arises, the Code Correlation Committee determines which committee hears the proposed change. This prevents contradictory requirements across different code books and ensures consistency.
From Code Change to Construction Site
Once a new edition of the code is published, the real work begins. The ICC government relations staff facilitates adoption by local jurisdictions. Codes become law only after adoption by state or local governments, and lawmakers can adopt the entire code, portions of it, or make their own amendments. Currently, I-Codes are in force at some level in all 50 states and the District of Columbia.
Adoption Timelines and Variations Across Jurisdictions
The three-year code cycle does not mean every jurisdiction updates automatically. Each state and local authority sets its own adoption schedule. Some states adopt new codes within months of publication, while others remain on editions several cycles behind. This creates a patchwork of requirements that builders working across multiple jurisdictions must navigate carefully.
Some states, like California, maintain their own building codes based on the I-Codes with state-specific amendments. Others adopt the ICC codes wholesale through state legislation. Builders working on projects across state lines must verify which edition of which code is currently in effect at each location. A framing detail that passed inspection in one county may fail in the next if different code editions or local amendments apply.
Local Amendments and Their Impact
When a jurisdiction adopts a model code, it frequently adds local amendments. These amendments reflect regional conditions such as high wind zones, seismic activity, heavy snow loads, or flood risks. They may also address local construction practices, available materials, or climate considerations. For example, a coastal jurisdiction may require stricter corrosion-resistant fasteners than the base code mandates. A northern state may require higher insulation values than the IECC minimums. Builders should always verify local amendments before designing or specifying materials, as these additions can significantly affect both cost and construction methods.
What This Means for Builders
For builders, staying current with code changes is not optional. Every three-year cycle brings updates that affect everything from permit requirements and inspection procedures to material specifications and installation methods. Key areas that see frequent updates include:
- Energy efficiency: The IECC continues to raise standards for insulation, air sealing, window performance, and mechanical systems. Understanding current building energy code requirements is critical for compliance.
- Structural provisions: Wind loads, seismic design, and snow load requirements are updated as engineering understanding improves.
- Fire safety: Sprinkler requirements, egress paths, and fire-rated assemblies see regular revisions.
- Material approvals: New products and materials must meet updated testing and approval standards.
How Homeowners Are Affected
Code changes affect homeowners primarily during renovation and new construction. Stricter energy codes mean higher upfront costs but lower utility bills. Updated safety requirements mean better protection against fire, structural failure, and natural disasters. When planning a renovation project, checking current building code and zoning requirements before starting can save significant time and expense.
Participating in the Process
One of the strengths of the ICC system is that any interested person can participate. Builders, designers, and homeowners can submit code change proposals, comment on proposed changes during the public comment period, and attend public hearings. The ICC accepts applications for committee service, and local code officials often welcome input from experienced builders in their jurisdictions.
The next time you pick up a code book, remember that the requirements you see are the result of thousands of hours of debate, technical analysis, and public input from people across the construction industry. Understanding how the process works gives you the knowledge to comply with current rules and the opportunity to help shape future ones.