A building permit is required for most non-residential construction, new homes, and when existing homes are remodeled or additions are made. These documents provide critical information needed to successfully complete the residential project plan review, permitting and inspections process.Step 2 Fill Out the Application. Before you can fill out an application, you will need a Permit Center account. At PHX ID, we are a group of highly professional custom home designers capable of house plan drafting services. You will upload the permit application you filled out, along with your required PDF documents and pay any upfront fees. 2243 E. Claxton Street Gilbert, AZ 85297. Building a custom home in Arizona is more than a dream – it's a journey. Want to see who made the cut?