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Bringing structure to vision, from first sketch to final build.
We work hand-in-hand with architects, builders, and homeowners to provide structural engineering services for new builds, remodels, additions, and foundation work. We take on projects in the residential and commercial sectors. Our team is known for timely delivery, adaptable service, and clear communication, helping projects move forward efficiently.
Welcome to L120 Engineering
Based in WA, but licensed and active throughout the US.
Compact TEAM, wIDE reach
Local expertise
Rooted in Washington State
From Queen Anne remodels to beachfront builds, we understand the state's terrain, permitting requirements, and architectural styles. Our local knowledge means faster, smoother projects, and fewer surprises.​
Trusted Collaboration
A Network That Works for You
We regularly partner with top architects, contractors, and specialists in the region. Whether you’re early in planning or need quick turnaround support, we can bring the right people to the table.
Versatile Experience
From Concepts to Custom Builds
With decades of structural engineering experience, we support a wide range of projects, from feasibility consultations and foundation repairs to complex, high-end custom homes.
HOW WE CAN HELP YOU​​
At L120 Engineering and Design, we provide structural engineering services for residential and commercial projects across the Seattle area. Our work includes:
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Construction drawings
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Foundation inspections
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Site visits
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Feasibility consultations
We specialize in high-end custom homes, luxury remodels, story additions, and unique builds, from mountain cabins to coastal residences. We also assist homeowners exploring a potential renovation, as well as builders and contractors needing fast, reliable engineering input or a second opinion.
If you're starting a project and think we might be a good fit, don’t hesitate to reach out. We’re happy to offer guidance or connect you with one of our many trusted partners in architecture or foundation work.
Our fields of expertise
Residential
We support homeowners, architects, and builders with structural design for new homes, remodels, additions, and multi-family buildings. From feasibility to final drawings, we deliver practical, clear solutions for projects of any scale.
Services include:
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New custom homes & luxury builds
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Remodels, additions, ADUs/DADUs
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Multi-family: townhomes, condos, apartments
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Structural assessments & feasibility reviews
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Permit-ready structural drawings
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Seismic evaluation & retrofit
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Construction support & site visits
FEATURED PROJECTS
2022-2023
Custom high-end luxury cabin nestled in the heart of Snoqualmie Pass
2022-2023
A beautifully laid out, and intricately designed custom luxury residence in the coveted Suncadia development
2017-2018
Contemporary townhomes incorporating open-concept floor plans, exterior modulation, and feature corners