When it comes to the mechanical and electrical services in properties, sometimes things go wrong. These essential systems can suffer from defects due to failure in design, materials or workmanship. That’s where MIDI comes in. Machinery Inherent Defects Insurance covers the damage caused by inherent defects in building systems and equipment. Our MIDI cover is included in our New Homes, Private Rental, Social Housing and Commercial warranties. It’s valid for five years following completion of the property.