Window repair in Fairfax, VA, from Argo on Dorr Avenue, runs through the parts of an opening that decide whether a sash moves at all: jamb liners, parting beads, stops, weatherstrip, shims, and the perimeter seal behind the casing. A double-hung that binds or drags is usually one of those, replaced in an afternoon rather than ordered in for weeks. Glass is the next line, with insulated units hazed at the edge seal replaced inside the standing frame, plus tempered, laminated, annealed, and Low-E sized to the opening. Wood is the third, where failed lengths at the sill are taken back to sound stock and replaced in new wood milled to the profile in place, then primed and painted. Hardware is the fourth: balances, casement operators, hinge arms, cam locks, keepers, rollers and track. Crews cover Merrifield, Falls Church, Annandale, Vienna, and Tysons across Fairfax County, licensed, bonded, and insured.