What this checklist covers
Flashing order is what keeps water out: sill first, then sides, then head, each layer lapped over the one below it. Follow the window or door maker's installation instructions; they also decide the warranty.
How to use it
Tick each item as you go. The sheet saves in this browser, so you can close the page and come back. Print a blank copy for the truck, or fill it in on your phone and print or save it as a PDF for the customer at the end.
With Koira: Customer portal
Every Koira customer gets one link: the estimate, the photos, the invoice and the payment in one place, so the walkthrough notes and the final bill are where the customer can find them.
Last checked October 9, 2026. This page is general information, not legal or tax advice. Rules change and differ by state and city, so confirm with the agency named before you act.