Certify Houston LLC. Provides the highest quality metal fabrication and welding. Centrally located near the ship channel, the company’s facility sits on 3 acres with buildings totaling 27,000 square feet. Certify Houston is large enough to meet all your turn-key project needs, yet small enough to give each project the personal attention it deserves. Our products and services assist the Oil & Gas, Power Energy and Trucking industries. While Safety is our #1 priority, our Quality is 2nd to none. Honesty, integrity and a straightforward approach are cornerstones of our business.