Built on standards, finished with care

Our story

It's in our blood

At Onyx Concrete, concrete isn't just work. It's a craft.

Onyx is led by Sergio Martinez, part of a family of cement masons. Before starting Onyx in 2025, he spent more than a decade as a commercial foreman, leading crews on complex projects and delivering finishes that don't just hold up, they stand out.

Flatwork is the backbone of the business: strong garage slabs, clean sidewalks, patios built for gathering and shop floors that can take a beating. Every surface, from a classic broom finish to exposed aggregate, sand, stamped or machine-burnished, is laid with precision, pride and purpose.

Onyx handles both residential and commercial projects, proudly based in Tacoma and rooted in the Pacific Northwest. You're not getting rushed labor or shortcuts. You're getting the skill and finish of commercial-grade work, with the heart of a local contractor you can rely on.

Our promise

Commercial precision, neighborly care

Clear communication, honest work, and jobsites we'd be proud to walk our own kids across.

“Onyx Concrete is a family business that delivers a level of care, craftsmanship, and integrity that many large corporate companies simply cannot match.”William M., Google review