At Wilson & HAJ Consultant Engineers, LLC, we are more than engineers — we are licensed  engineers and experienced committed to transforming residential visions into structurally sound realities. Specializing in Custom Homes, Remodels, Additions, Garage Conversions, DADUs, Retaining Walls, Structural Retrofits and more, we provide expert guidance from concept to completion.

Whether it's designing a new two-level home with a basement or reinforcing a load-bearing wall, our team brings deep technical knowledge, attention to detail, and a passion for quality craftsmanship. Every project we take on is backed by engineering precision, permit-ready plans, and hands-on construction management — ensuring safety, code compliance, and long-term durability.

We proudly serve homeowners, architects, and developers throughout Washington State, offering a one-stop solution for all residential structural needs.

At Wilson & HAJ Consultant Engineers, LLC, we deliver structural engineering with precision, performance, and trusted partnership.

From design to construction, we bring expert solutions that ensure safety, code compliance, and long-term value. 

Home design.

Addition to existing home. 

Residential remodels.

Load bearing walls verification.

DADUs & ADUs.

Retaining walls (concrete & blocks).

Reports and Structural Observation Letters.

Project management.

Construction administration.

Planning and construction cost management.