Before we can discuss the impact  non-permitted work has on a home, it is important to talk about what a permit is and why it is required for work completed on a home.  Permits are typically issued in accordance with a city or county ordinance.  Therefore, not obtaining permits for required items is unlawful.  Permits are the simplest way for a governing body to manage the construction practices of a community for the general welfare of the residents.  From the ground up, local inspectors confirm that construction is being completed in a manner that meets building code standards.   These standards were created to insure the building is  structurally sound and safe. If you are using a contractor, they will be able to identify what work requires a permit.  In Santa Clara County, any work totaling over $500 requires a licensed contractor.  A non-licensed contractor may not know the building codes and may not be aware of permits required.  A great site for finding information about a contractor is the Better Business Bureau.  You can also try The Prime Buyer’s Report for reviews and ratings of local contractors. Directly from the Santa Clara County web site: When Is A Building Permit Required? A building permit must be obtained before you erect, construct, enlarge, alter, move, repair, improve, convert, or demolish any building or structure.  This includes decks over 30 inches high, patio covers, sheds over 120 square feet, fences over 6 ft. high, and retaining walls more than 4 ft. in height, measured from the bottom of the footing to the top of the wall.  Fees are calculated based on the size, type and valuation of construction. Typical codes that apply: Uniform Building Code, Uniform Mechanical Code, Uniform Plumbing Code, National Electrical Code, and State building codes.  For single-family dwelling,…