At Wilson & HAJ Construction Contractors, LLC, we are more than just a construction company — we are a team of professional engineers, experienced contractors, sharp estimators, and dedicated project managers working together to deliver exceptional results.

We specialize in residential structural projects, including new builds, remodels, garage conversions, additions, and DADUs throughout Washington State. What sets us apart is our collaborative, in-house approach: our engineering expertise ensures structural safety and code compliance, while our construction team brings those designs to life with precision and care.

From the initial consultation to the final walkthrough, we take pride in our transparent communication, accurate budgeting, and efficient project management — ensuring every client feels supported, informed, and satisfied.

Your vision is our mission — built with integrity, performance, and trusted partnership.

• ✅ Structural Engineering for Residential Projects
  Design, analysis, and permit-ready plans by licensed engineers

• ✅ Custom Home Construction
  Full-service design-build for new single-family and multi-level homes

• ✅ Garage Conversions & ADUs/DADUs
  Transform existing spaces into functional, code-compliant living areas

• ✅ Home Additions & Remodels
  Expand or upgrade your home with structural integrity and seamless finishes

• ✅ Load-Bearing Wall Modifications
  Engineering and construction for safe wall removal and open-concept layouts

• ✅ Framing, Foundations & Structural Retrofits
  Expert construction of wood and concrete systems to meet modern standards

• ✅ Permit Sets & City Submittals
  Complete drawing packages and structural calculations for permit approval

• ✅ Estimating & Budgeting
  Accurate cost estimates to help clients plan and make informed decisions

• ✅ Project Management & Construction Oversight
  On-time, on-budget execution with clear communication every step of the way

Our vision is to be the most trusted name in residential construction by delivering structurally sound, beautifully built spaces through a seamless collaboration of engineering and craftsmanship. We aim to set a new standard in the industry — where precision, transparency, and professionalism guide every step, and client satisfaction is the foundation of our success.

We believe that by uniting engineering excellence with construction expertise, we can help homeowners bring their vision to life with confidence, clarity, and lasting value.