IEBC Compliance Methods
Summary
The IEBC offers three ways to show an existing building project complies: the prescriptive method, the work area method, and the performance method with its numerical scoring. The project follows one method, and the choice sets which chapters apply and how much of the building must be upgraded, so choose it at the start of design.
Cols
Scope
- Cites the 2024 IEBC structure as carried in the 2025 California Existing Building Code; the text of the IEBC could not be read directly, so these are chapter-level provisions. Always verify the adopted code edition and local amendments for the project jurisdiction
- Covers how to choose among the methods and what each includes. Details of alterations, additions, and changes of occupancy are in their own notes
- Note that California did not adopt the performance compliance chapter; the model code includes it
Terminology
- Compliance method: the path used to show an alteration, addition, or change of occupancy meets the code
- Prescriptive compliance method: the method in Chapter 5, with direct rules for additions, alterations, fire escapes, windows, change of occupancy, and historic buildings
- Work area method: the method in Chapters 6 through 12, which classifies work into Levels 1, 2, and 3 and sets requirements by level
- Performance compliance method: the method in Chapter 13, which scores the existing building on safety parameters
- Work area: the part of the floor area where the alteration occurs, including the area reconfigured or affected
- Provisions for all compliance methods: Chapter 3 requirements that apply whichever method is used
- Safe parameter score: a numerical rating of an existing building's safety features
- Equivalency: an approved alternative to a code requirement
- Dangerous condition: a condition that must be corrected regardless of method
- Building official determination: the official's authority to decide whether the work complies
Requirements
Chapter 3, provisions for all methods
| Section | Title |
|---|---|
| 301 | Administration |
| 302 | General provisions |
| 303 | Storm shelters |
| 304 | Structural design loads and evaluation and design procedures |
| 305 | In-situ load tests |
| 306 | Accessibility for existing buildings |
| 307 | Smoke alarms |
| 308 | Carbon monoxide detection |
The three methods
| Method | Chapters | Approach |
|---|---|---|
| Prescriptive | 5 | Direct requirements for additions (502), alterations (503), fire escapes (504), windows and emergency escape openings (505), change of occupancy (506), and historic buildings (507) |
| Work area | 6 through 12 | Classify the work (Chapter 6) as Level 1 (Chapter 7), Level 2 (Chapter 8), or Level 3 (Chapter 9), with change of occupancy (Chapter 10), additions (Chapter 11), and historic buildings (Chapter 12) |
| Performance | 13 | Evaluate the existing building with a numerical scoring system covering 21 safety parameters and the degree of compliance of each, to show that alterations improve the existing situation |
- Chapter 13 sections: general (1301), applicability (1302), acceptance (1303), investigation and evaluation (1304), scoring and evaluation (1305), building score (1306), and evaluation of building safety (1307)
- The performance method lets alterations that do not meet new construction rules be accepted when the evaluation shows they improve safety
Authority
- The building official may approve alternatives and has increased authority to determine compliance in the 2024 edition (reported in a draft summary of changes)
Worked examples
Choosing a method
| Project | Likely method | Reason |
|---|---|---|
| Replace finishes and fixtures in an office floor with no layout changes | Work area method, Level 1 | Limited, clear scope |
| Reconfigure partitions on three floors of an older office building | Work area method, Level 2 or 3 | Scales requirements to the area changed |
| Small addition and a few alterations to a small building | Prescriptive method | Direct rules in one chapter |
| Older building that cannot meet code for an alteration, with unusual conditions | Performance method | Scoring demonstrates equivalent safety |
| Change from office to restaurant | Work area (Chapter 10) or prescriptive (506) | Depends on the jurisdiction and building |
Documenting the method
| Item | Where it goes |
|---|---|
| Method selected | Code analysis sheet |
| Work area boundaries and percent of the building | Plan diagram and the area table |
| Level of alteration | Code analysis sheet |
| Chapter 3 items (accessibility, smoke alarms, structural) | Checklist in the plan set |
Coordination
- Building official: a pre-application meeting settles the method and the area of work before drawings
- Code consultant: performance method scoring is a specialized evaluation
- Accessibility: Chapter 3 Section 306 applies in all methods, with federal accessibility law as an additional layer
- Structural engineer: Chapter 3 Section 304 sets structural evaluation for alterations and additions
- Fire protection: smoke alarms (307) and carbon monoxide detection (308) are included in all methods
- Owner: the compliance path affects scope, cost, and schedule
Common issues
- Mixing methods: the project follows one method
- Underestimating the work area: reconfiguration and system changes enlarge the work area
- Ignoring Chapter 3: accessibility and smoke alarms apply everywhere
- Assuming the performance chapter exists locally: some jurisdictions do not adopt it
- Historic buildings: a separate chapter may offer more relief
- Documentation: missing method statements delay review
Standards
- IEBC Chapters 3, 5 through 13: compliance methods
- ICC A117.1 and the 2010 ADA Standards: accessibility
- NFPA 101: existing-building chapters as an alternative where adopted
Sources
- GoCodebook: 2025 California Existing Building Code, Chapter 3 provisions for all compliance methods, https://gocodebook.com/library/us/ca/ca-existing-building-code/chapter-3-provisions-for-all-compliance-methods
- GoCodebook: 2025 California Existing Building Code, Chapter 5 prescriptive compliance method, https://gocodebook.com/library/us/ca/ca-existing-building-code/chapter-5-prescriptive-compliance-method
- GoCodebook: 2025 California Existing Building Code, Chapter 13 performance compliance methods, https://gocodebook.com/library/us/ca/ca-existing-building-code/chapter-13-performance-compliance-methods