Since 1996, National Property Inspections Wisconsin has inspected over 44,000 homes and 4,000 commercial properties. Our professional inspectors are licensed and certified in accordance with state guidelines, and are fully insured to help you protect and maintain your biggest investments. NPI Wisconsin also offers a variety of additional services like radon testing, field service inspections, and energy audits to give you a complete picture of the condition of your home or commercial property.