Start with the conditions, not the catalog
Flashing, sill condition, the frame material, glass package, trim restoration, and solar exposure all shape the result about as much as the window unit itself does.
Build a complete scope
- Existing conditions and likely cause
- Preparation and protection
- Materials, compatibility, and installation details
- Permits, testing, cleanup, and restoration
- Exclusions, warranty terms, and change-order process
Joliet context
Vinyl and fiberglass replacement work is common in Crest Hill and New Lenox, where postwar-era subdivisions built up through the mid-twentieth century used simpler window openings than the East Side's older Queen Anne stock -- openings that are typically more straightforward to fit with modern vinyl or fiberglass units without extensive trim or sill rework.