How to Find the Manufacturer of a Replacement Window

Quck answer

When trying to identify a replacement window manufacturer, there are several key steps to follow. First, research different manufacturers online and read customer reviews to gauge their reputation. Look for manufacturers with a strong track record and positive customer feedback. Next, check for certifications and accreditations, such as ENERGY STAR ratings, to ensure the manufacturer meets industry standards. Additionally, consider the warranty offered by the manufacturer and the level of customer support they provide. Finally, reach out to the manufacturer directly with any questions or concerns to assess their responsiveness and professionalism. By following these steps, you can confidently identify a reliable replacement window manufacturer.


If you discover a broken window in your house, you’ll want to replace it. However, it can be challenging to find the right replacement window. Although not as simple as changing a light bulb, you can easily identify the manufacturer of your window and find a suitable replacement if you know where to look.

Step 1: Search for Identifying Details

Examine the window that needs replacing. Look for a product label, serial number, or logo. This information may be on the window sash, which is the frame surrounding the glass. Alternatively, you might find it etched into a corner of the glass.

Some windows have standardized labels from the American Architectural Manufacturers Association Certification Program or the National Fenestration Rating Council Certified Products Directory. If your window has one of these silver or gold labels, locate the manufacturer’s code, usually labeled as “MFR CODE” or “CODE.” You can search for the code on either the AAMA’s or NFRC’s website to identify the manufacturer.

Step 2: Note the Window Style

Determine the type of window you are replacing, as different manufacturers produce different window styles. Common window styles include single-hung (opens from the bottom), double-hung (tilts inward), horizontal sliding windows, glass block windows, projection windows (open away from the house), and picture windows (do not open at all).

Take note of the window type you have. If your window doesn’t fit into any common category, describe its characteristics, such as its appearance and opening direction (if applicable).

Step 3: Visit a Local Window Supplier

Once you have gathered all available information about your window, bring the serial numbers, logos, window descriptions, and any other relevant details to a local window supplier. They should be able to help you identify the manufacturer and order the appropriate replacement. If the manufacturer cannot be identified or is out of business, a window specialist can assist you in ordering a custom replacement.

Step 4: Purchase the Correct Window for the Job

If you are searching for a window on your own, either online or in stores, make sure you understand the difference between replacement windows and new construction windows. New construction windows come with a nailing fin that surrounds the frame, allowing the window to be nailed into a wall opening. For a replacement window, the nailing fin is not necessary. You need a window that can be installed into an existing opening. New construction windows are typically used in new homes or additions, while replacement windows are suitable for replacing existing windows.

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