It is advisable to sign a written contract agreement when you need to hire reputed window replacement agency. Almost all the window installers sign a contract agreement with the clients. Make sure that all the terms and conditions are mentioned in the agreement so that there are no confusions later on. Mention all the payment terms and conditions.
Please read the originial post here: https://windowrenovation.weebly.com/blog/what-is-included-in-window-replacement