About Us

Our value to our clients is rooted...

About D2 Engineering

Since 2001, D2 ENGINEERING, has successfully completed over 3000 projects for commercial, office tenant, medical, institutional, data centers, mission critical 24/7, government, multi-family high-rises, hotels and recreational facilities.

Donegan Engineering Inc, was started in 1989 by James T. Donegan, P.E. Superior Engineers, Inc. was founded in 1996 by Sam Davati, P.E. The two companies merged in 2001 and formed D2 Engineering, LLC. The company provides mechanical, electrical, and plumbing design services to a wide variety of commercial clients, primarily in the Washington DC area.

Our value to our clients is rooted in our own business values and practices.

  • Delivering high quality, professional engineering design and construction services while adhering to a specified schedule and staying within budget.
  • Teamwork approach between our professional staff and the client to really understand the client’s goals and have the resources to act on them.
  • Flexibility and willingness to do business our client’s way by focusing on their unique needs and adding our professional services – bringing value to the partnership, be it anywhere from consulting services to complete design and construction services; to build a facility from the ground up.
  • Solutions that are practical, effective, and proven as well as ideas that are well-honed to the business challenges our clients face on a daily basis – these principles are grounded in experience from having successfully garnered a proven track record with clients whose needs we have served in the past and continue to serve today.
electial engineering

Why D2 Engineering?

- Principals are both professional engineers all with more than 25 years of experience in the field.

- Specializing in Design and Construction Services for Commercial, Medical and Institutional Facilities.

D2 ENGINEERING is gaining in stature as a respected engineering design company through sustained relationships with our existing clients and creating relationships with new clients.

mechanical engineering


On the left is Terry Donegan on the right is Sam Davati

Mechanical, Electrical, Plumbing Engineering Design Services



mechanical engineering

Mechanical Engineering

Delivering high quality, professional engineering design and construction services.

Electrical Engineering

Electrical Engineering

Mission Critical - consulting services to complete design and construction services; to build a facility from the ground up.

Plumbing Engineering

Solutions that are practical, effective, and proven as well as ideas that are well-honed to the business challenges our clients face

Other Services

Engineering Construction
Services

Planning

  • Analysis of Project M/E/P Requirements
  • Comparative Reliability Analysis
  • Life Cycle Studies and Cost Analysis
  • SEE MORE NOW!

Design & Pre-Construction

Mechanical/Plumbing systems design and coordination with Architect & Civil Engineer.

Electrical design and coordination with Architect and all other disciplines. SEE MORE NOW!

Commissioning

  • Development of HVAC and Electrical Commissioning Procedures and Specifications tailored for the specific project
  • Building Systems Integration Testing
  • Factory Witness & Acceptance Testing
  • SEE MORE NOW...


D2 ENGINEERING is gaining in stature as a respected engineering design company.

Since 2001, D2 ENGINEERING, has successfully completed over 3000 projects



Meet Our Team

About us

D2 ENGINEERING is an experienced engineering design company providing superior engineering design, construction services, and commissioning for new construction, renovations, mission critical and tenant fit outs.

D2 ENGINEERING offers a vast knowledge of design and expertise in commercial facilities. We focus on providing for our client the quality performance achieved in a cost effective and timely manner. The principals and key personnel of D2 ENGINEERING are experienced in mechanical, electrical, and plumbing systems. The principals have over 25 years of experience.

  • Mechanical Engineering
  • Electrical Engineering
  • Plumbing Engineering

Serving the Washington, D.C., Maryland and Virginia metropolitan area.

Our Clients