Westerville runs its own state-certified building department, so your deck permit never goes through the county, even on the Delaware County side of the city line. Two desks review it, Building and Planning, and we deal with both before a shovel touches the yard.
Plan on roughly two weeks from a complete application to approval from both desks. Decks are classed as accessory structures under city code and have to sit behind the house, with rear-yard setback rules that tighten once the deck rises above 30 inches off grade. Fees are set by the Building Division and change, so we confirm the current figure before we file rather than quote an old number. Sources: City of Westerville Building Division, Westerville Deck Permit Guide & Forms, Westerville Codified Ordinances, Accessory Structures (Ch. 1175).
Westerville is old enough to have a real historic core and big enough to run its own certified building department instead of leaning on the county. Both facts change how a deck project here actually moves through approval.