InstaPreView Blog
Building codes, AHJs, permitting, and plan review — explained for architects, engineers, and designers.
What Occupancy Classification Really Tells You About a Space
The occupancy label on a plan classifies the type of use it is not the headcount. Learn how classification and occupant load work together to drive egress and fire protection.
Window Egress for Residential Buildings: Does It Change Nationwide, or Is It Always the Same?
Residential egress window rules are nearly uniform nationwide because most jurisdictions adopt the IRC, but editions and local amendments shift the details. Here are the numbers, code anchors, and the mistakes reviewers catch.
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.
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.
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.