Structural Engineering

Structural Design Services

Many types of building materials or combinations of the following:

→ Steel

→ Cast in Place Concrete

→ Precast Concrete, Masonry

→ Light Gauge Metal Framing

→ Post Framing

→ Wood Framing

→ Glu-lam & Heavy Timber

→ Sheet Pile & Steel Pile

→ Helical Pile Foundations

→ Helical and Geo-Lock Anchors

Our Expertise

Multi-Family, Multi-Story Residential

Schools, Hospitals, Motels/Hotels

Nursing Homes & Long Term Care Facilities

Steel Stud Framing Design

Industrial & Manufacturing

Commercial, Retail, Offices

Cold Storage Facilities


Industrial Warehousing

New Residential, Remodeling, Sunrooms, Screened Porches

Inspections of Commercial & Residential Buildings for Structural Defects

Solar Framing

Post Frame Buildings & Post Frame Houses

Engineered Foundation Plans for Businesses, Garages, Homes and Manufactured Homes

HUD Inspections and Certification of Manufactured and Modular Homes

Farm Product Storage Facilities

Grain Bin Slabs

Fertilizer & Potato Storage

Livestock Facilities

Stacking Slab Barns (NRCS)

Our Work

Picture 1 is an Apartment Complex which Duffy worked on.

Picture 2 & 3 show the Virnig Manufacturing Facility in Central MN and Solar Panels that were added to their plant. Duffy Engineering worked on the installation of these panels.

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