Online 3D Stair Builder with AI - Design Any Staircase, Generate Blueprints & Cut Lists

Design any staircase with our all-in-one Online 3D Stair Builder, now featuring RedX AI. Describe the stairs you want in plain language — straight, L-shaped, U-shaped, winder, spiral, or multi-landing — and RedX AI builds the complete 3D design with stringers, treads, risers, and landings. Refine every detail yourself in the interactive 3D viewer, check riser heights and tread depths against common residential code limits, and generate detailed stringer blueprints with full cut lists. Export or print professional PDF plans to take straight to the job site. Ideal for builders, carpenters, and DIY enthusiasts.