E-21 Construction (E-21), is a privately-owned construction firm that specializes in site preparation which includes buried utility construction, stormwater control, earthwork construction, and demolition.

Since 1991 the firm has brought decades of construction and engineering experience to our customer's projects.

About Our Company

E-21 is a licensed General Contractor and fully-insured limited liability corporation that provides services to top 500 corporations, financial institutions, major contractors and governmental agencies at all levels.

As a professional company, and as individuals, we strive to provide excellence in our service to our clients.

Key Team Members

Sergius Hanson, P.E., P.G.

Principal Engineer

Founder of E-21 Construction

Paul Gottler, P.G.

Environmental Assessments

22 Years at E-21 Construction

Mike Smith

Chief Operations Officer

14 Years at E-21 Construction

Mat Wargo

Field Superintendent

12 Years at E-21 Construction

Our Customers

We strive to provide excellent services to each customer.  E-21 personnel has performed over 2,000 projects, for all types of clients with a heavy emphasis in the defense industrial base sector.

Government - All Levels

US Air Force, Buckley AFB
US Air Force, Cheyenne Mountain AFB
US Air Force, Schriever AFB
US Forest Service
US Bureau of Land Management
US Department of Agriculture
Colorado Department of Health
Colorado Division of Oil and Public Safety
Counties of Adams, Douglas, Jefferson and Weld
Cities of Aurora, Denver, Englewood, Glenwood Springs
Arapahoe-Douglas Mental Health
Aurora, Denver, and Littleton Public Schools

Industrial and Aerospace

Lockheed Martin Space Systems
US Air Force, Buckley Aerospace Data Facility
Ball Aerospace
MillerCoors Brewery
Excel Energy
Waste Management of North America
Shamrock Foods
Rocky Mountain Bottling Company
Sun Edison
Tri-State Generation and Transmission Assoc.


Panorama Commercial Group
Amoco Oil Co.
Valero Energy Company
K&G Stores, Inc.
Circle K
7 Eleven
Gilco, Inc.
Trammel Crowe Development
Jon Cook Properties
Phil Long Ford


Bank of Colorado
First Bank
Citibank Financial
Vectra Bank
Equitable Real Estate
Bank One Commercial
General Electric Capital Corp.
Republic National Bank
ZJ Investments
Allied Realty

Construction - General Contractors

Hensel Phelps Construction Co.
W. E. O’Neil Construction
J. E. Dunn Construction
G. H. Phipps Construction Co.
BAB Builders
Jordy Construction
LVI Services, Inc.
Argus Contracting
Sturgeon Electric Company, Inc.
Apollo Mechanical Contractors
Weitz Construction
Adolfson & Peterson Construction
Modular Management Group, Inc.