"If there is a defect in the house, who fixes it, and for how long?" In Japan, the answer depends on a mix of mandatory laws and individual company policies. It is crucial to understand the distinction. The Legal Baseline: 10 Years for Everyone By law (The Housing Quality Assurance Act), all new housing builders must provide a 10-year warranty for: 1. Structural Stability (Columns, beams, foundations) 2. Rainwater Prevention (Roofs, walls, windows) This is mandatory. Whe