Structural engineering is a very, very specialized item. It’s math you want correct and traceable to make sure things you build will stand up. It’s required whenever you are building a retaining wall greater than four feet tall. That four feet includes the required 18 inches underground to provide a stable base and prevent frost heaving. Also required sometimes when the land above has a slope. I worked with engineer Kevin McCormick there. He is sharp, fast. He can adapt to your project, discuss design tradeoffs, do drawings for permits, do on-site inspections/provide advice to contractors in a contractor-friendly manner, and even negotiate and politely prevail with City of Portland structural engineers on what the proper formula is right for the job. I have developed two reinforced concrete structural walls with that engineer, including permit drawings, calculations, on site issues and details for contractors. He was very polite and customer oriented explaining to the rebar guys on the job site how to fix what they were doing so the wall would stand up. Contractors are sensitive — weird. They learned something from this engineer without losing face. Miller has a whole staff of experienced and qualified structural engineers. This is the spot in Portland metro, based on experience, for structural engineering for walls and structural remodels! If your building permit process needs an engineer, this is the place!