What Questions Should I Ask a Window Installation Contractor?

Hiring the right contractor is one of the most important steps in any window replacement project. Whether you're a first-time renovator or comparing estimates, knowing what to ask before hiring a window company helps you avoid costly surprises and ensures you choose a team you can trust. Here's a guide to the essential questions to ask a window installation contractor

Top Questions to Ask Before Choosing a Window Installer

1. Are You Licensed and Insured?

   Always confirm that your contractor is properly licensed and carries both liability and workers' compensation insurance. This protects you and your property in case of an accident or damage.

2. Who Will Be Doing the Installation?

   Ask if the company uses in-house crews or subcontractors. In-house teams often deliver more consistent quality and communication throughout the project.

3. What Kind of Warranty Do You Offer?

   You should receive both a manufacturer warranty on the windows and a workmanship warranty on the installation. Ask how long each lasts and what’s covered.

4. Can You Provide a Detailed Timeline?

   Get a clear idea of when the project will start, how long it will take, and any factors that might cause delays. Knowing the window installation timeline helps set expectations.

5. What Materials and Brands Do You Use?

   Not all windows are created equal. Ask about the brands offered and why the contractor recommends them. Energy-efficient, well-sealed windows can improve performance and comfort.

6. What’s Your Clean-Up Process?

   A professional crew should leave your home clean and debris-free. Ask about disposal of old windows and daily job site maintenance.

7. Are There Any Hidden Fees?

   Get a detailed, written estimate and ask if it includes everything: labor, materials, trim, permits, and disposal. Transparency is key to avoiding unexpected costs.

Window Replacement Checklist for Homeowners:

•  Verify licensing and insurance

• Confirm who will install the windows

•  Review warranty coverage

•  Understand the installation timeline

•  Ask about product quality and energy efficiency

•  Clarify clean-up and debris removal policies

•  Request a full written estimate with no hidden fees

Choosing a window installer doesn’t have to be overwhelming. With the right questions, you’ll feel more confident, informed, and prepared to move forward.

We’re happy to answer all your questions—schedule a consultation today with Windows on Washington.

Know what to ask—and what to expect. Let’s talk about your window project.