UBI, Inc. The exterior inspection of the building includes; siding, trim, gutters & downspouts, grounds, slope, windows, garage, decks, patios, stoops, and related items. Each item is inspected not only for its condition, but how it relates to the building. Issues with exterior components such as the siding or windows can greatly affect other components of the home. The exterior of the building is designed to protect the interior components and keep out the elements.