About Us

JJA, Inc. is a leading mechanical and electrical engineering consulting firm established in Dallas, Texas, in 1978, providing engineering design of HVAC, plumbing, fire suppression, electrical distribution and critical power systems, lighting systems, life safety systems, sustainable designs, energy modeling and MEP system commissioning.

Offering professional Engineering registrations in over 30 states, providing services locally, regionally, and nationally. JJA also performs national on-call MEP services for several corporate clients.

Our team is committed to sustainable design solutions, utilizing innovative engineering design processes that focus on the life cycle performance for MEP Systems.

We are dedicated to servicing our clients with integrity and responsiveness, while providing a collaborative TEAM solution.

Legacy

In 1978, Jim Johnston had a vision to develop a startup engineering firm, James Johnston & Associates Inc., which focused on providing an enhanced quality of engineering design services for the building construction industry.

He provided a hands-on management approach for projects and clients while taking time from each day to mentor and develop staff. This "teacher" mentality developed many excellent engineers in the mechanical and electrical disciplines of the building construction industry, many who are still employed with the firm.

With the inclusion of senior level personnel on each project, the business established a core group of select clients providing repeat design opportunities throughout the Dallas-Fort Worth Metroplex. Continued growth has helped us expand our services, offering clients MEP engineering specialization across a multitude of market sectors. Today, we do business simply as JJA, Inc., serving local, regional, and national clients.

We are proud of Jim's vision and dedicated effort building JJA and its quality reputation.