Several things to note. 1. They are just about the only game in town for a retaining wall more than six inches. There are other companies but they are mostly inexperienced, will practically demand...
Vertical Walls
(4)
Vertical Walls, established in 1999, is a leading company specializing in designing and constructing high-quality retaining walls across the East Coast. With a dedicated team of experienced professionals, they pride themselves on exceeding project schedules and delivering durable solutions for slope stabilization, wall repairs, and dam spillways.
Known for their expertise in the industry, Vertical Walls offers a range of services including residential and commercial retaining walls, athletic facility solutions, and NCDOT-certified contracting. Their commitment to quality craftsmanship and timely estimating makes them a reliable choice for any retaining wall project.
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Reviews

Poor experience with an employee of this company. Do better, seems to be a common theme.
Went in for a job interview. Towards the end of it, the interviewer stated that, "being able to fit the company culture is a big part of the hiring process because we talk about odd things here."...
Terrible customer service. They may be the only game in town but I'd skip the game completely. They don't call you back and are priced extremely high. It's a NO for me. Keystone retaining walls is...