Start with conditions, not a product
Installation method, flashing, sill condition, frame material, glass package, trim restoration, and solar exposure matter as much as the unit itself.
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
Naperville context
Window openings in Naperville-area homes reflect the era they were framed in: older homes near the historic district and early-20th-century additions often carry smaller, non-standard rough openings, while postwar ranch and split-level subdivisions standardized around wood double-hung sash that has since been replaced piecemeal over decades. DuPage County's building requirements and, for homes inside recognized historic areas, added review can affect what can be swapped in versus what needs a custom unit. Illinois' summer humidity and winter cold both put real demands on seal and frame performance regardless of a home's age.