Steel Prefab Kits Our steel kits are best for DIY, garages, shops, or commercial structures.Prices range from $15 to $45 per sq ft. Most popular sizes: 30×40 ($28,361) — 40×60 ($46,857) — 50×80 ($52,996) If you prefer a traditional Wood structure, please complete this custom home builder form You Can Also Start By Ordering Your Floor Plan See All 1,000+ Floor Plans