Real Solutions From Southern Maryland Commercial Experts!


Great Mills Trading Post understands a commercial development of any size is a serious undertaking and we are committed to creating a proper project plan.  We strive for excellence with each project in Southern Maryland, from beginning to end.






For over 30 years Great Mills Trading Post has been serving the community in the Community as a General contactor for their commercial building needs in all major industries:

Local / County Government- St. Mary’s County Public Works & Transportation Department, St. Mary’s County Metropolitan Commission.
State Government- MD State, SHA...
Federal Government

US Navy- Patuxent River NAVAIR

Local & Regional Construction Companies


Great Mills Trading Post offers a wide variety of services in Southern Maryland and the surrounding counties.

Our services include: managing all phases of construction, permitting to build out including electrical and plumbing, general contracting and construction,  storm water management, demolition, paving, excavating, truck and equipment operations, aggregate materials, and more

Bubby Knott's Legacy of Giving Lives On


As we try to move on in the light of our dad’s passing; we have racked our brains in ways to best honor his legacy.  In a few words; what we remember most about our dad is his giving spirit and the support he showed our community.  We are happy to share our first act to keep his legacy alive.  We are not sure if you have heard of the Survivor Tractor, but long story short, this tractor has been raising money to support Cancer for quite some time.  Our dad bought the tractor several times as it hit the auction circuit.  He was the last purchaser right before the onset of Covid.  So, we thought it is only fitting to use this Survivor Tractor to help support the families of local children with cancer.

This tractor has raised over $100,000 in the past!  If you are interested in hearing the back story behind the tractor, check out the links below:

Origins of The Survivor Tractor - The Beginning (

New Holland Agriculture Auctions Off Survivor Tractor to Original Owner to Continue Legacy of Raising Cancer Awareness | Hay and Forage Magazine

Here are the details:  Tickets are $25/ticket.  Only 1000 tickets sold!  Win the Survivor Tractor or $5000 – Winner’s Choice.

Please consider supporting this cause by purchasing tickets.  Please call or email us at  or with your request and we will reserve your ticket(s)!  Tickets are also available at our office. Checks should be made payable to Clements Cuties and mailed to us at the address below.  Thank you in advance for helping us not only support a great cause but also honor our dad!

Thank you, Karen & Bobbie Jo

Karen Siebert, CFO
20171 Point Lookout Road
Great Mills, MD  20634

(301) 994-0300

About Great Mills Trading Post


GMTP places partnering with all stakeholders at the forefront of each project to ensure the preconstruction process goes as smoothly. We would establish goals to be reviewed at each progress meeting during preconstruction, including;

 Minimize risk and traffic maintenance for the public
 Ensure the site is safe for employees and traveling public
 Follow all MDE & Traffic Control Guidelines
 Protect existing wetlands and park areas
 Complete the project on budget and on schedule.

Need Materials for a small job?
Contact our residential division.


Looking for new home construction?
Contact our real estate partners.

For all Your equipment needs.
Construction, Farm Equipment, Trucks, Trailers & more

Why Choose Great Mills Trading Post for your next construction project?

Very nice people go out their way to help u .
....Sam J.

Awesome place and people

.... William M.

Used the Trading Post for years. They have done excavating and paving work for me. Quality work and the prices were fair. In reference to there negative reviews on Google, Trading Post has many commercial vehicles my guess is 75 plus and your bound to get multiple phone calls I know from experience I have 4 delivery trucks and I field at least 2 calls a week complaining about a rock hitting there windshield or our truck suddenly stopped. It’s not the same driving a 20,000lb vehicle as it is a car. Reaction time is needed and every car wants to get in front of a dump truck. I know Trading Post and they are a great company who gives a ton to the community. I understand the offices frustration with phone calls but I would hope these negative reviews don’t affect anyone’s opinion on using the Trading Post for all there excavation paving or site utility work.

....George A.