30 cities · 908 active licenses · checked Sep 29, 2026

Licensed window replacement contractors in California

California contractors are licensed by the Contractors State License Board (CSLB). Its license check shows a license's status, including complaint disclosure. (Source: Check a Contractor License or Home Improvement Salesperson (HIS) Registration)

How to check a contractor license in California

Open CSLB's Check a Contractor License page. (Source: Check a Contractor License or Home Improvement Salesperson (HIS) Registration)
Search by license number, business name, or the name of a person on the license. California contractor license numbers contain digits only. (Source: Check a Contractor License or Home Improvement Salesperson (HIS) Registration)
Read the license status and disciplinary history. The license record also shows the contractor's workers' compensation and insurance information. (Source: How do I find the right licensed contractor?)
When a contractor comes to give you a bid, CSLB suggests asking to see their pocket license and a picture ID, and making sure the person matches the license. (Source: How do I find the right licensed contractor?)

Open CSLB Check a Contractor License

Every listing on this site also has its own Verify license link that opens its record with the California Contractors State License Board.

Window replacement contractors by city in California

Cities with 10 or more window replacement contractors with an active license, A to Z. The number is how many are based in each city.

What California requires of contractors

Anyone who contracts for work on a project that needs a building permit, uses employees, or is valued at $1,000 or more in combined labor and materials must hold a current, valid CSLB license. (Source: What Kind of Contractor Do You Need?)
CSLB licenses contractors in 45 classifications. For a single-trade job such as roofing, CSLB suggests a contractor licensed in that specialty; a "B" General Building contractor can take on a project that involves more than two types of work. (Source: What Kind of Contractor Do You Need?)
Licensed contractors must carry a $25,000 contractor license bond. CSLB notes it is often not enough to cover several complaints, or a project worth more than the bond. (Source: How do I find the right licensed contractor?)
Contractors with employees must carry workers' compensation insurance, and C-39 roofing contractors must carry it whether or not they have employees. (Source: How do I find the right licensed contractor?)
Contractor ads, business cards, bids and contracts must show the contractor's license number. (Source: How do I find the right licensed contractor?)
Home improvement projects over $500 in combined labor and materials need a written contract, and any changes to it must also be in writing. (Source: What Should I Look for in a Contract and Binding Agreements?)
A down payment can't be more than 10% of the contract price or $1,000, whichever is less, unless the contractor has a Blanket Performance and Payment Bond on file with CSLB. (Source: How do I find the right licensed contractor?; What Should I Look for in a Contract and Binding Agreements?)

CSLB's advice before you hire

Get at least three written bids based on the same plans, specifications and scope of work, and be wary of a bid far below the others. (Source: How do I find the right licensed contractor?)
Ask to see a certificate of insurance, or for the name of the contractor's insurance carrier and agency. Commercial general liability insurance isn't required, but it covers damage to your property. (Source: How do I find the right licensed contractor?)
Never sign a blank or partially blank contract, and put every change in a written change order. (Source: What Should I Look for in a Contract and Binding Agreements?)
CSLB says you may cancel within three days of signing a contract; the cancellation must be in writing and mailed before midnight of the third day. (Source: What Should I Look for in a Contract and Binding Agreements?)

Where these listings come from

Listings for California come from the CSLB Public Data Portal: License Master file dataset published by the Contractors State License Board. CSLB notes that license status can change at any time and points to its license check for the most current status. We last checked it on Sep 29, 2026. See how we verify listings.