Watertown is a low-moderate cost-of-living market — pricing guide and permit rules below.
Watertown window replacement rates: $3,000-$10,000 per system. Always get 3 written quotes and verify SD licensing at South Dakota BIC (sdbic.com). Sales tax on materials: 4.5%.
Watertown requires permits when work exceeds $25,000 or involves full system replacement. Your licensed contractor pulls the permit — if they ask you to pull it, that's a red flag.