A deck can make a backyard feel like an extension of the house. Outdoor stairs can connect a porch to the lawn or provide access to an upper-level entrance. These features are easy to admire during a showing, especially when they are freshly stained or surrounded by attractive landscaping. But decks and exterior stairs are exposed to weather and repeated use, so their condition deserves more than a quick glance. Look Beyond the Surface Deck boards are the most visible part of a structure, but the supports underneath are just as important. Posts, beams, joists, fasteners, and connections all help…