Be sure the area around the house is graded properly to provide good drainage. Front porches, gables or other details add value to the property. Established trees, shrubbery and perennials add value to the property. If neighboring properties are too run-down, they may affect your resale value. Look for evidence of a sense of identity, and pride of ownership in the other homes.
Nearby services can also add value.
Parks or recreation centers can add value to the property. A long time on the market may indicate problems with the house or neighborhood that you need to know. If there's a problem with the house or the neighborhood, assess the situation carefully. This could be anything from building a new mass-transit station to widening the area's major roadway. Major construction projects like these are usually part of a long-range city, town or county plan.