As his or her title suggests, your home inspector is looking at the condition of your house, not the grounds or surrounding features. This means he's unlikely to spot problems beyond those on the interior or exterior of the house itself, leaving the buyer vulnerable to issues with outbuildings or fences. Unfortunately, these elements often represent a fairly major expense, and can create big headaches if they're damaged or unstable.
In addition to sheds and fencing, home inspectors typically don't inspect underground pipes, septic tanks or wells, all of which are particularly expensive to repair or replace [source: Scherzer and Andrews]. If you're buying a home that includes a large number of outbuildings or other outdoor features, be sure to negotiate these items into the inspection checklist. If your inspector isn't willing to cooperate, or feels ill-equipped to handle these types of structures, consider hiring a second inspector who's more experienced in this type of work.