1. Document the condition before anything else
Record what's showing, take safe steps to prevent it from worsening, and gather what history exists on the property.
2. Evaluate the house and site
Install method, flashing, sill condition, frame material, glazing package, trim restoration, and sun and salt exposure on that wall matter as much as the window itself.
3. Put a full scope in writing
Cover prep, protective measures, materials, access, permitting, testing, cleanup, finish restoration, exclusions, and how changes are priced.
4. Compare full proposals
Check credentials, then compare the reasoning and boundaries behind each proposal — the total by itself tells you the least.
5. Confirm everything at closeout
Make sure testing, cleanup, documentation, and warranty terms are confirmed, and that you know what upkeep is left to you.