Luxury bathroom remodels frequently exceed expected timelines for four reasons: long-lead materials (imported stone, custom vanities, specialty plumbing fixtures) ordered too late in the process, unexpected structural conditions discovered after demolition, permitting delays for plumbing and electrical scopes, and subcontractor scheduling conflicts in a busy market. Firms that self-perform plumbing and finish carpentry typically have fewer subcontractor scheduling problems than firms that broker every trade.