1. Observe and protect
Document symptoms, limit further damage where it is safe to do so, and collect relevant history.
2. Evaluate the house and site
Installation method, flashing, sill condition, frame material, glass package, and trim restoration matter as much as the window unit itself, especially against East Tennessee's full four-season valley climate of cold winter nights and long, humid summers.
3. Define a written scope
Clarify preparation, protection, materials, access, permits, testing, cleanup, finish restoration, exclusions, and change-order rules.
4. Compare providers
Verify credentials and compare the reasoning and boundaries behind each proposal, not only the total.
5. Inspect closeout
Confirm testing, cleanup, documentation, warranties, and remaining maintenance responsibilities.