Steel Door Inc.

Steel Door Institute

The #1 resource for commercial steel doors and frames

The Steel Door Institute (SDI) was established in 1954 as a voluntary, non-profit business association that develops quality and performance standards for steel doors and frames.

SDI’s standards are available without charge. Design professionals around the world specify these standards because they are concise and regularly updated with leading industry practices.

Only SDI Certified manufacturers undergo recurring audits to ensure compliance with our standards for strength, quality and consistency. By specifying SDI Certified, you can be assured you will receive a product that is well-constructed, tested, and evaluated to meet your specifications.

As a complete steel door and frame resource, the SDI website also has a Door Selector Tool, Frequently Asked Questions and Product Gallery. We also offer online and in-person continuing education for AIA and GBCI credit.

Eight Door Upgrades for Better Buildings

Steel doors and frames are often specified as a standard product. However, design professionals are increasingly putting a new twist on an old classic by modifying them for better aesthetics or performance. These are the steel door upgrades that we’ve been seeing a lot of lately.