Reston is a very high cost-of-living market — pricing guide and permit rules below.
Reston window replacement rates: $5,000-$18,000 per system. Reston's humidity and storms make regular maintenance essential. Always get 3 written quotes and verify VA licensing at Virginia DPOR (dpor.virginia.gov). Sales tax on materials: 5.3%.
Reston requires permits when work exceeds $1,000 or involves full system replacement. Your licensed contractor pulls the permit — if they ask you to pull it, that's a red flag.