Faulty ground drainage often causes water intrusion beneath buildings. Such problems can be pervasive, difficult to resolve, and may cause damage to building components. Electrical safety violations, either few or many, are to be found in the majority of homes. Rotted wood is common where components remain wet for long periods. Exterior locations are trim, eaves, and decks.
Problems also occur at walls and floors in bathrooms.
Code violations are common where additions and alterations are built without permits. This is a red flag to most home inspectors. Fireplaces and chimneys are often unsafe. Common causes are amateur installation of hardware and fixtures, exterior rust damage, or simple failure to call a chimney sweep. Water heaters are seldom in total compliance with code requirements.