Commercial Construction
Commercial building success, built on solid results.
Great Mills Trading Post is the general contractor Southern Maryland turns to for commercial, government, and heavy civil projects — from first grading stake to final walkthrough.
55+ Years
in Southern MD
12 Core
Core Service Lines
NAVAIR
Federal & military contract experience
Our Mission
A commercial build is a serious undertaking. We plan it that way.
Every project starts with a real plan, not a rough estimate. Our team scopes the site, sequences the work, and stays accountable to the budget and schedule we set — on public infrastructure, private commercial builds, and everything in between.
It's why local and county agencies, state and federal partners, and private developers across St. Mary's, Charles, and lower Calvert counties keep calling Great Mills Trading Post back, project after project.
YMCA Construction in St. Mary's County
Track Record
1970–Today
General contracting for government, military, and commercial clients across Southern Maryland.
Core Capabilities
Full-scope commercial construction, under one contractor.
We self-manage every phase of the build — permitting, sitework, and the trades that follow — so you're coordinating with one accountable team instead of a dozen subcontractors.
Demolition
Site clearing and structure removal to get a parcel build-ready.
Excavating & Grading
Earthwork, grading, and site prep for commercial and civil sites.
Paving & Asphalt
Parking lots, access roads, and highway-grade paving.
Water & Sewer
Underground utility installation for commercial and municipal sites.
Building Services
Build-out coordination, including electrical and plumbing trades.
Utility Construction
Site utility infrastructure installed to support new development.
Concrete
Foundations, flatwork, and structural concrete for commercial builds.
Stormwater Management
Design-compliant stormwater systems built to MDE standards.
Storm Drain
Storm drainage installation integrated into overall site utility work.
Sediment & Erosion Control
Erosion and sediment control measures maintained through every project phase.
Roadways
Road construction and reconstruction for public and private sites.
Highway Construction
Heavy civil highway work for state and county transportation projects.
THow We Manage Every Project
The details that keep a commercial build on budget and on schedule.
Cost Control
Transparent budgeting and tracking from the first estimate to closeout.
Schedule Compliance
Sequenced timelines that keep every trade and phase on pace.
Design Interpretation
Engineering and design plans translated into an accurate, buildable scope.
As-Built Documentation
Final as-built design and calculations delivered at project closeout.
Environmental Protection
Wetland, floodplain, and traffic maintenance measures built into every plan.
Public & Site Safety
MDE and traffic control guidelines followed to protect crews and the public alike.
Industries Served
Trusted by government, military, and private clients alike.
For more than three decades, Great Mills Trading Post has served as general contractor across every level of government and the private sector in Southern Maryland.
Local & County Government
St. Mary's County Public Works & Transportation, and the St. Mary's County Metropolitan Commission.
State Government
Maryland State and Maryland State Highway Administration projects.
Federal & Military
Federal government contracts, including work for the U.S. Navy at Patuxent River NAVAIR.
Commercial & Regional Builders
Private commercial developers and regional construction companies throughout Southern Maryland.
Working With GMTP
Partnership-first preconstruction, from goal-setting to groundbreaking.
Align
Set Project Goals
We bring every stakeholder to the table before ground is broken.
Plan
Review at Each Milestone
Progress meetings throughout preconstruction keep the plan on track.
Protect
Manage Risk & Environment
Traffic maintenance, site safety, and wetland protection built in.
Deliver
Finish On Budget, On Time
We measure success the same way you do — on schedule and on budget.
Ready to talk through your next commercial project?