Yes, interior designers in Los Angeles, California, need to be certified. The certification process is managed by the California Council for Interior Design Certification (CCIDC). While it’s not technically a license, this certification is recognized as the standard for interior designers and is often required by employers and clients. However, it’s important to note that you can still work as an interior designer without certification, but you may face certain limitations. For example, uncertified designers cannot use the title “Certified Interior Designer” or sign off on nonstructural or nonseismic plans. To become certified, you need to pass the IDEX California exam, which covers California codes, business practices, design standards, and more. Source