Get Fast, Permit-Ready Structural Plans by Licensed Washington Engineers

Washington structural engineers providing permit-ready plans, calculations, and structural inspections for residential projects across Seattle, Bellevue, Tacoma, Spokane, and all of Washington. Unlimited plan-check revisions within our engineering scope* at no extra cost.

Licensed WA Engineers

Same-Day Quote

2-3 Week Delivery

Permit Guarantee*

Highly Responsive

Fixed Transparent Pricing

3000+ Permits Approved

(844) 750-0773

Call (844) 750-0773

Licensed Washington Engineers|WA PE License #24002154 - Amarendra Prasad, PE

3000+

Projects Completed

2-3 Weeks

Average Delivery

Guaranteed*

Permit Approval

5.0

Google Rating

OUR SERVICES

We provide complete structural engineering and civil engineering for residential projects, including new custom homes, ADUs, remodels and additions, load-bearing wall removals, foundation design, and retaining walls throughout Seattle, Bellevue, Tacoma, and all of Washington. Our licensed engineers collaborate closely with architects and homeowners to ensure safe, efficient, and permit-ready designs that bring your vision to life.

Our Structural Engineering Services

New Custom Home

Complete structural engineering for new custom home construction and luxury residences. Custom home structural design, luxury home engineering, ground-up construction plans, complete structural plans, and permit-ready documentation.

ADU Engineering

Expert structural design for accessory dwelling units and garage conversions. ADU structural plans, garage conversions, backyard cottage design, detached ADU engineering, and permit-ready calculations.

Remodel & Addition

Structural engineering for home additions, expansions, and remodeling projects. Room additions & extensions, second story additions, kitchen remodel engineering, bathroom expansion plans, and structural modifications.

Load-Bearing Wall Removal

Safe structural analysis and engineering for wall removal and interior remodels. Load-bearing wall evaluation, beam sizing & design, support system engineering, open concept conversions, and open floor plan engineering.

Foundation Design

Professional foundation engineering for all soil conditions and seismic requirements. Foundation design & plans, hillside construction support, soil bearing analysis, seismic foundation design, and repair & retrofit plans.

Deck, Patio & Porch

Structural design for outdoor living spaces including decks, patios, and porches. Deck structural plans, patio cover engineering, porch structural design, elevated deck calculations, and code-compliant designs.

Same-day quote • 2-3 weeks delivery • No hidden fees

Don't Have Plans or Architectural Drawings Yet?

No problem! We work with a network of trusted, design partners and licensed architects who can help you design your project from scratch. Once your design plans are ready, we'll handle all the structural engineering seamlessly.

Architect/Designer Referrals

Coordination Support

Expert Guidance

HOW IT WORKS

Our Engineering Process

Fill Out Our Form & Schedule Free Consultation

Complete our quick form and schedule a call with a dedicated project manager. Share your design plans and project description. Don't have plans yet? We can refer you to trusted architects and designers at no extra cost, who can help!

Get Same-Day Quote

After reviewing your project details, we'll provide a transparent quote the same day--typically within a few hours. Pricing varies based on project scope, complexity, and requirements.

Get Permit-Ready Plans in 2-3 Weeks

We deliver complete structural permit sets stamped by our licensed engineers. *If building departments have comments related to our scope, we handle all revisions--no extra fees, no limits.

SUCCESS STORIES

What Our Clients Are Saying

See why homeowners and industry professionals across Washington trust us with their projects.

"ProStruct Engineering prepared the structural plans for my home remodel, which required extensive consideration due to the age of my house and its location near the beach. Nithin, the project manager, was incredibly responsive, quickly facilitating changes requested by the city during the review cycles. Their expertise and willingness to consult throughout the construction process will be invaluable. I'm genuinely grateful for their professionalism and support."

Sandra

"The engineer checked thoroughly for issues related to our foundation. He gave unbiased opinion and very constructive recommendations to mitigate the issues. Compared to the sales person from various foundation contractors, this advise would help us avoid the over engineering and save more than $30k."

ZF Zhan

"Prostruct was great! Responsive, prompt, great communication. I am looking forward to going into the permitting process with them since I know to expect good results and communication."

Vatche Bezdikian

"I just received notice that I will now have my permit to build a bathroom and bedroom as a remodel in my garage. Josh was great and Nithin and his team helped me through the process. YAY!"

Dee Sherm

"The PM was prompt and the engineer that came to assess structure was courteous. He was able to give us a report including all the details he discussed with us in person. The PM is knowledgeable of the general construction process as well. Would definitely send business their way again, should a structural assessment need arise again."

Hiren Patel

"We contracted ProStruct to look at the integrity of some retaining walls. Nithin, Josh, and Jesse were swift with their communication and very knowledgeable. We will be using them again in the future!"

Wade

"Easy process! Great communication every step and the inspector was able to come out and inspect our foundation very quickly. Overall impressive company who I would recommend!!"

Tamara Lee

"Very smooth experience. Accommodated my timelines and helpful reviews. Thanks"

Mallikarjuna Vallem

Trusted by homeowners and AEC industry professionals across Washington

Fast delivery • Permit guarantee* • Fixed Transparent Pricing

Built for Speed, Clarity, and Permit Success

Why Clients Choose ProStruct Engineering

Local Licensed Engineers Near You

Find licensed engineers who know your area's building codes and requirements. We serve all of Washington with fast, professional service wherever you are.

Licensed Professional Engineers

All our engineers are Washington licensed Professional Engineers (PE) with years of experience. Get peace of mind knowing your project is handled by qualified experts.

Fast Engineering Service

Quick response times and efficient delivery. Most site visits scheduled within days, and we deliver structural plans and reports in 2-3 weeks.

Your Own Dedicated Project Manager

Every project includes a dedicated project manager at no additional cost. They act as your single point of contact, coordinating with our engineers and collaborating with third-party professionals--including architects, contractors, and others--on matters within our scope to ensure clear communication, faster decisions, and a seamless project experience.

Free Engineering Quote

Contact us today and receive a detailed, free estimate quickly. We respond fast and provide accurate quotes for your project with no obligation.

Permit Revision Guarantee*

If building departments have comments related to our scope of work*, we'll revise plans at no extra charge--no matter how many rounds it takes. We stand by our work until your permit is approved.

Serving Structural Engineering Clients Across Washington

Find licensed engineers near you in Seattle, Bellevue, Tacoma, Spokane, Vancouver, Olympia, and all surrounding areas. Local expertise, fast service, and licensed engineers ready to help with your project.

COMMON QUESTIONS