• 3450 Lang Road, Houston, TX
  • 713-690-7328


ISO 9001:2008

Gretna Machine Shop, Inc. is ISO-certified and holds high scores through successful implementation of a Total Quality Management Program. Being in accordance with the standards of ISO 9001-2008 illustrates our continuous dedication to high-end quality work and continuous improvement.

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Women Business Enterprise (WBE)

Gretna is also certified by the Women’s Business Enterprise Alliance as a company that has majority ownership and control by women.  With this certification, government purchasing agents and publicly-traded and larger privately held-corporations can track and be confident that they are indeed doing business with women business owners.

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At Gretna, all of our CNC machines are UL-certified, which means that they have undergone rigorous safety analysis. Because UL is a global independent safety science company, the UL Mark is the most widely recognized and accepted third party certification mark in North America, giving products the surest route to product acceptance by authorities, regulators and customers.

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Better Business Bureau (BBB)

Gretna maintains an A+ rating with the Better Business Bureau. With a mission to create a community of trustworthy businesses, the BBB sets the standards for marketplace trust, encouraging and supporting best practices, celebrating marketplace role models, and denouncing substandard marketplace behavior.

Gretna is a proud member of the following professional organizations:

National Federation of Independent Business (NFIB)

NFIB is America’s leading small business association, promoting & protecting the right of its members to own, operate and grow their businesses.

Greater Houston Manufacturers Association (GHMA)

GHMA is a community of manufacturing professionals from the Houston area, collaborating in an effort to promote the success of individual companies and our region.