Inspections are required at various stages of work in progress before that work is covered up. Footings require inspection before pouring concrete. Underground electrical, mechanical and plumbing work is inspected before covering. Rough in electrical, mechanical, plumbing and framing must be inspected & approved before covering with insulation or finish material (gypsum board). Inspections are also required on gas piping systems and electrical services. An approved final inspection is required before the building may be occupied. Note that Linn County inspectors are trained and certified as combination inspectors, which means each inspector is responsible for inspecting all trades. Please view these handouts for further information. Click Schedule an inspection online or call our office at 319-892-5130 to schedule an inspection by phone. Allow at least twenty- four hours if you need a specific time for an inspection. Inspection requests made on the same day will be worked in the schedule if possible.