Annex Engineering Group is a full service MEP Engineering design firm. Founded in 2017, Annex has rapidly grown to include a specialized understanding of the engineering field, as well as how to apply those principles to a project in a functional and complementary manner. Clients return because of Annex’s ability to listen to and understand the needs of each client at each location and for each building type. It is Annex’s attention to detail in both field surveys and designs that set it apart. At Annex, success is not measured by the quantity of projects, but by the quality of work and the relationships formed and maintained.


Annex Engineering Group was founded by Douglas Smelker in August 2017. Since then, it has added Ian McClaskie and Rick Sibert as Discipline Heads, as well a continuously growing staff of knowledgeable engineers.


Doug Smelker PE



Ian McClaskie

Senior Designer


Rick Sibert

Senior Electrical Designer

Next Steps...

For your next project, do not hesitate to contact us. We at Annex look forward to working with your organization and meeting your design needs.