Typical limitations to the structural design of a deck are septic tanks and property setbacks. With a septic tank, most counties will require a minimum spacing between septic tank and post of 5’-0”; some counties may require this to be up to 7’-0” away. If a post is installed over a septic tank, it could damage the system and cause it to have to be replaced. If the system is damaged after the deck has been installed, the deck would require disassembly to access and replace the damaged tank.
Property setbacks can also restrict or limit the size of a deck addition. Typical limitations are set by the county; occasionally, a neighborhood homeowner’s association will have further restrictions that must be met. We are not licensed surveyors and do not perform surveys. We are able to show the house and deck on a survey to depict dimensions to property lines to show the deck does not infringe on setbacks.