The 2024 International Building Code is structured, rational, and internally consistent. Yet in practice, many projects experience delays not because the code is unclear, but because the logic connecting its parts is not fully demonstrated. This book examines the International Building Code 2024 as a decision system. It does not restate the code. Instead, it focuses on how occupancy classification, construction type, fire protection, height and area limits, and means of egress interact — and how those interactions affect real projects during plan review. Written for practicing professionals, this guide translates code language into field logic. Scope of This Guide This volume addresses: • The boundary between the IBC and the IRC • Height and area calculations under Chapter 5 • Construction types and fire-resistance strategy • Mixed-occupancy methods (accessory, separated, nonseparated) • Fire protection system trade-offs • Means of egress analysis and common review comments • Accessibility coordination within IBC projects • Typical plan review failures and how to prevent them Each chapter focuses on decision pathways rather than isolated provisions. The International Building Code operates as a system of thresholds and trade-offs. Height and area limits depend on construction type and sprinkler protection. Egress requirements depend on occupancy and occupant load. Mixed-use strategies alter allowable building size and separation requirements. This guide organizes those relationships clearly and sequentially. The goal is not simplification, but clarity. By presenting code logic in a structured format, the book aims to reduce correction cycles, improve documentation quality, and support defensible design decisions.