November 8, 2025 · 6 min read
How to Choose a Window Installer in California
The window matters, but the install matters more. Here's how to pick the right contractor.
A great window installed badly performs worse than a mediocre window installed well. Here's how to hire right.
10 Questions to Ask
- Are you licensed with the California CSLB? (Verify the number online.)
- Are you bonded and insured — can I see the certificates?
- How long have you installed this specific brand?
- Who does the actual install — employees or subcontractors?
- What's your written warranty on labor?
- Do you pull permits when required?
- How do you handle stucco, drywall and trim repair?
- Can I see three recent local references?
- What's the exact glass package and NFRC rating?
- What's your payment schedule? (Avoid anyone demanding >30% upfront.)
Red Flags
Door-to-door pressure sales, verbal-only quotes, cash-only pricing, and installers who can't produce license and insurance documents are all reasons to walk away.
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