Window projects can be difficult to compare because contractors may recommend different products or installation methods. A few consistent questions make the quotes easier to evaluate.
Define the project scope
Count openings, note any damaged frames and decide whether appearance changes are part of the project.
Ask about installation method
Clarify whether the proposal is insert replacement, full-frame replacement or another method, and what trim work is included.
Compare glass and frame specifications
Ask for the exact product line and glass package so you are comparing like with like.
Understand finishing work
Interior trim, exterior capping, paint touchups and disposal may or may not be included.
Review warranty and service process
Ask who handles a warranty claim and whether labor is covered if a unit needs future service.
Before you decide
Keep copies of estimates, contracts, warranties and important communications. For regulated services or high-value projects, independently verify credentials or requirements that apply in your location.