Civil Engineers &
Land Surveyors

Firestation 1 in Yuma, AZ. - A project engineered by Core Engineering.

Welcome to Core Engineering Group

Yuma's leader in civil engineering, public works, and land surveying services

Welcome to Core Engineering Group, your trusted partner in civil engineering excellence serving the vibrant communities of Arizona and California. Founded by Douglas Nicholls, PE, RLS, our firm is dedicated to providing innovative and comprehensive solutions in transportation engineering, public works, commercial development design, residential subdivision services, and land surveying.

With a commitment to professionalism, integrity, and client satisfaction, we are here to support your infrastructure needs and contribute to the sustainable growth and prosperity of our region. Explore our website to learn more about our services and how we can assist you in realizing your project goals.



Core Engineering Group, PLLC Announces
Acquisition of James Davey and Associates, Inc.

Coming Together to Create One Strong Yuma Consultant to Meet Your Needs.


Core JDA Logos


July 1, 2024 —Douglas J. Nicholls, PE, RLS, founded Core Engineering Group, PLLC (Core) in February 2004. In the years since, he has surrounded himself with talented colleagues and an impressive roster of collaborative firms. This now includes the 2024 acquisition of James Davey and Associates, Inc. (JDA). JDA is a strong Yuma firm, founded in 1992 by James Davey, providing civil engineering, survey, and construction administration services, with special expertise in water supply and wastewater engineering and the planning and design of irrigation systems. James and his staff are joining the existing Core Team establishing Core as a preeminent provider of civil engineering and land surveying services effective today July 1st.


“It is exciting to have Jim and his staff join the current Core Team as we begin this next 20 years of Core. Adding their experience and expertise will provide a strong suite of inhouse services for our clients.” said Douglas J. Nicholls, PE, RLS, Founder of Core Engineering Group, PLLC.

“After 32 years as an independent firm, we are greatly looking forward to joining forces with Core and the ability to build on their areas of expertise and offering complete civil engineering services.” said James Davey, Founder of James Davey and Associates, Inc.

Core’s technical expertise is extensive. Our experienced staff is well-positioned to tackle any civil engineering or land surveying project, and diverse examples of our successful work are visible throughout Arizona and Southeast California.
Learn More About The New Team & Services

Thank You Yuma, For 20 Years of Support

a large section of road engineered by Core Engineering

What We Do

Civil engineering and Land Surveying serving Arizona and California

Core Engineering Group specializes in a wide range of services essential to infrastructure development and construction projects in the region including public works, surveying, transportation, commercial, and residential.

Public Works + Waterline Services

public works engineering project site with a crane lowering a huge concrete culvert


man surveys a job site

Transportation Engineering

a roundabout near i-8 in Yuma, AZ

Commercial Development Design

RL Jones Building, a commercial engineering project conducted by Core Engineering

Residential + Subdivision Services

A drone photo of a neighborhood in Yuma, AZ
American Society of Engineers
National Society of Professional Engineers
International Transportation Engineers
Greater Yuma Economic Development Corp
Yuma Chamber of Commerce

Contact Us!

To discuss your next project contact our founder Douglas Nicholls, PE, RLS

City Hall in Yuma, AZ