Every building inspection takes a different amount of time. Most of the factors that affect how long an inspection will take are entirely under the control of the contractor. Projects that are constructed in a very professional manner, utilizing high-quality approved construction components, and adhere to approved plans are generally very quick to inspect. In contrast, projects that deviate from plans, or utilize questionable materials or construction techniques may result in numerous inspection corrections. In general, most inspections can be completed in under an hour.