Structural Engineering

Building Up Communities Since 1990

The Structural Engineering Department is made up of Engineers and CAD Technicians with more than seventy-five years of combined experience.

Start Your Project

Since 1990 Duffy Engineering and Associates has been offering professional structural engineering services for commercial, industrial and residential uses. Duffy Engineering is unique in that we focus on structural engineering. Whether you need structural engineering work for new construction, remodeling, or renovation work, have confidence knowing our team of highly skilled engineers has the experience you need and the willingness to help with your project.

Duffy is currently licensed in Minnesota, South Dakota, North Dakota, Wisconsin, Arkansas, Florida, and Utah. If you need work done in another state, please feel free to use our contact us page and let us know more details.

Our objective is simple. . .


Working with Duffy Engineering means, we have one goal-To exceed our clients’ needs and expectations. Our philosophy is to be your Structural Engineer and single source solution while promoting all projects in the most cost effective and timely manner possible. With our team you get highly qualified and ethical personnel that will promote an atmosphere that fosters communication, flexibility, and a partnership with all our clients. We aim to build lasting relationships with our clients by providing quality solutions and excellent service.

What Our
Clients Say

I’ve worked with Duffy on two separate occasions. They are unbelievably friendly, professional and flexible. Great experience! I highly recommend!

Five Star Google Review

Great engineers and services. Residential, commercial, industrial. They can do it all, and at such reasonable prices.

Five Star Google Review

Our Services

Generally, our clients fit into one of these categories:

  • Construction
  • Consulting
  • Developing
  • State & Local Governments
  • Cities or Towns
  • Homeowners

Our contacts usually include:

  • Architects
  • Business Owners
  • Developers
  • Contractors

We promise:

• Complete understanding of our work with of all our clients
• Open communication
• We completely focus on our clients’ needs and wants
• Superior satisfaction
• Services are directed to meet your needs in a timely manner

Achieving The Project You Want Is Easy With Duffy Engineering.

1. Contact Us To Set Up An Appointment

During this meeting, we’ll discuss your vision for your project and make sure that it’s a project that we can take on.

2. Approval Of Project Specifications

Every project is different. To get a thorough understanding of your vision for your project, we’ll work with you so the job fits comfortably within your budget.

We won’t start until all the details are correct. Final specifications, scheduling, measurements, and material ordering will all be internally reviewed and approved. We don’t want any hiccups during construction, so this final review step is crucial to ensure a seamless project.

3. Building Your Project & Quality Inspection

Once every detail is finalized and approved, our talented team of craftsmen will begin the drafting work for your project, keeping deadlines and dates in mind every step of the way.

4. Enjoy Your Finished Project

How you choose to celebrate your project with Duffy Engineering is up to you!

Structural Engineering

Our structural staff is made up of engineers and CAD technicians with more than seventy-five years of combined experience. We work with many different types of construction materials in our efforts to solve a wide spectrum of design challenge.

  • Duffy Engineering also does Inspections of Fire and Storm damage to buildings on Residential and Commercial properties.
  • Plus, we do Hud Inspections on Manufactured Homes.

Committed to Sustainability