When sourcing house ladders, safety is the paramount concern. You must ensure the product complies with international standards such as EN131 (Europe), ANSI A14.2 (USA), or AS/NZS 1892 (Australia). Check for load capacity ratings, typically requiring a minimum of 150kg (330 lbs) for heavy-duty domestic use. Verify the material quality: 6063 aluminum alloy is the industry standard for a high strength-to-weight ratio. Additionally, inspect the anti-slip foot pads and tread depth; treads should be at least 80mm wide with deep serrations to prevent slipping.