The plan review submission shall give a complete description of the work to be performed. The City of Milan Building Department has prepared this Guidebook to assist you in the process of building an addition within our City.This list is provided as a guide to help you understand the information that must be contained on the construction drawings. Additionally, permits can be obtained via mail. The City of Portage Building Services Team Department has prepared this Guidebook to assist you in the process of building a new home within our City. Three sets of plans are required to be submitted with building permit applications for new building, additions and alterations, (when necessary. Most new construction will require a building permit. Only a couple of projects, being newly constructed, are exempt from building permits.