Home › Blog
InstaPreView Blog
Building codes, AHJs, permitting, and plan review — explained for architects, engineers, and designers.
Code Explainers
TDLR in Texas: What It Is and Why It Matters for Your Project
TDLR administers Texas accessibility rules through the TAS and the Architectural Barriers program. Here's what triggers registration, the role of a RAS, and the costly mistake reviewers see most.
Code Explainers
Understanding Occupancy Separation Under IBC 508: Mixed-Use Made Manageable
IBC 508 offers three paths for mixed occupancies—accessory, nonseparated, and separated. Here's how each affects allowable area and fire ratings, plus the classification mistakes plan reviewers catch most often.
AHJ & Permitting
What Is an AHJ (Authority Having Jurisdiction)?
Authority Having Jurisdiction is the office with the final say on your permit. Here's why their adopted edition and local amendments — not the model code — are the rules that actually govern your set.