Structural engineering Houston Katy Fwy — Sigma Engineering Services is a Houston structural and civil engineering consultancy associated with the Katy Freeway (I-10) corridor office market at 9111 Katy Freeway, Houston, TX 77024. Public contractor directories describe the firm as delivering structural analysis, construction-phase engineering support, and multidisciplinary coordination for commercial, industrial, energy, and selected residential projects across the Gulf Read more...