Full service structural engineering firm in St. Louis, Missouri

3407 South Jefferson Avenue, Suite 517
St. Louis, MO 63118
314.833.9739 | hi@stack.pe


how we work

At Stack, we believe in systems thinking, empathic design, and close collaboration with owners, architects, systems engineers, contractors, and occupants. We're committed to providing resource efficient solutions for clients' projects that minimize life cycle costs and environmental impacts of buildings and improve the occupants' well being.

Physical objects are best described visually. Whether it’s pen and paper or 3D computer models, visual studies help us understand, communicate, and problem solve quickly and efficiently. We have extensive experience with Revit, Rhino, and SketchUp as well as AutoCAD.


what we do


Engineering Services

New construction
Structural retrofit
Structural evaluation
Tenant improvement
Design-build shop drawings
Equipment anchorage

Project Types

Multi-family residential
Single-family residential
Exterior structures

Material Expertise

Reinforced concrete
Post-tensioned concrete
Historic brick
Cold-formed steel


Home owners
Business owners


where we do work

Based in St. Louis, Missouri, we’re licensed to practice in California, the District of Columbia, and Missouri. 


Alex Stack, PE, LEED AP BD+C

Alex received his bachelor’s degree in civil engineering from Northwestern University and his master’s in structural engineering, mechanics and materials from the University of California, Berkeley. After several years working at award-winning firms in Berkeley, CA, he founded Stack Structural Engineering in 2015.

Alex is a Licensed Professional Civil Engineer in California (81604), the District of Columbia (PE908426), Maryland (50192), Missouri (2017036663), and Virginia (402056947) and is a LEED Accredited Professional with a specialty in Building Design and Construction (11029632-AP-BD+C).