Know the installation method
Insert replacement keeps a sound existing frame. Full-frame replacement removes the old unit and exposes the opening so framing, insulation, flashing, and water damage can be addressed.
Count openings, not just windows
Bay, bow, picture, oversized, and mulled units can differ greatly from a standard double-hung window. Make a room-by-room list so every contractor prices the same openings.
Compare performance labels, not slogans
Ask for the exact product line and glass package. U-factor, solar heat gain, air leakage, frame material, spacer system, and warranty are more useful than broad claims like “energy efficient.”
Installation is part of the product
A good window can perform poorly if the opening is not properly flashed, insulated, sealed, and trimmed. Ask how the crew handles water management and hidden rot.
Bring this checklist to the estimate
- Opening schedule
- Insert/full-frame
- Product line
- Glass package
- Trim scope
- Rot repair rule
- Product/labor warranty
QuoteGeni education note: This guide helps homeowners prepare for contractor conversations. It is not a building-code determination, engineering opinion, inspection, or project quote. Requirements and conditions vary by property and municipality.