Questions to Ask Before Hiring a Window Replacement Company

Beyond comparing quotes on paper, these questions help separate a solid installer from one you'll want to avoid.

• "Are your installers employees or subcontractors?" — Not a dealbreaker either way, but worth knowing who's actually doing the work and what oversight looks like.
• "What's your labor warranty, separate from the manufacturer's product warranty?" — A strong product warranty means little if a poor installation is the actual failure point.
• "Will you pull the necessary permit if one's required?" — A reputable installer should know when a permit applies and handle it, not leave it to you.
• "What happens if you find rot or damage once the old window is out?" — Ask how that's priced and communicated, so it's not a surprise mid-project.
• "Can I see the actual NFRC U-factor and SHGC numbers for the product you're quoting?" — See our guide on reading quotes for why this matters.
• "How do you handle licensing and insurance?" — Ask to see current proof rather than taking it on faith.
• "What's a realistic timeline, including manufacturing lead time if the product is custom-ordered?"

A company that answers these clearly and specifically, without vague deflection, is generally a good sign. Vague or evasive answers to any of these are worth treating as a caution flag.