TRINITY Group Construction, Inc., is a leading commercial construction company in the DC Metropolitan Area, specializing in medium to large-scale projects. With a focus on client satisfaction, we have become an award-winning company. Our experienced team overcomes any obstacle to deliver projects on time and on budget. Established in 2002 by Flip Wallen, TRINITY’s success stems from his reputation and community relationships. Building strong relationships and delivering excellent work remains the foundation of our philosophy.


Experience the difference.

Whether renovating an existing building or constructing a brand-new structure from the ground up, the TRINITY team is committed to surpassing your highest expectations. In a constantly evolving industry, our commitment to innovation places us at the forefront of constructing projects with excellence.

In the words of our clients

As for [the project team] on the 6th floor at 1410, they are killing it…. A day doesn’t go by that someone from my team mentions another thing the two of them do that no one else does.  Job progress, up to date photos and notes, accurate billings with descriptions, and the whole job was the cleanest and most organized project I’ve seen in a decade.  That team is going to get sick of working here because we’re going to give them every job until they get sick of us. Appreciate the oversight and support. We feel very fortunate.

It was a pleasure combining our team’s efforts for a successful demolition and re‐build of the entire third floor including the Restrooms. Their Senior Project Manager and Project Superintendent continuously provided in the field observations and organized our teamwork seamlessly to create Bridge’s vision of their Abridge Suites. We would gladly recommend other Architecture/Interiors firms to partner with them in their future endeavors.

TRINITY approached every challenge with professionalism and a determination. They exceeded expectations and now The Children’s School has a fantastic, new, permanent home for many generations of preschoolers in Arlington!

Overcoming seemingly insurmountable obstacles – in light of a schedule that was extremely aggressive even before we asked you to cut an additional month from it – you managed a myriad of subcontractors and inspectors, and a complexity of schedule, material lead time, and construction deadlines to achieve an “on time” completion with professionalism and aplomb.

This was the best team I’ve had the pleasure of working with. TRINITY Group Construction would be my first choice if we should ever have the need to do this again. In other words… Great Job!

[TRINITY has] been an incredible partner in this project. Everyone at TRINITY has gone above and beyond in their work. I tell anyone who will listen, how great it is to have a GC who has our back 110%. As you have heard me say, this project is going to improve the lives of so many people. Thank you for helping bring this project to fruition.

The TRINITY team astounded us with their dedication, professionalism, and resourcefulness. Despite several field issues and Fire Marshall demands, TGC pulled through and the tenant moved in on schedule. We look forward to working with TGC again.

I would like to personally thank your team members with whom I have recently had the pleasure to work. In the past months, this team has stepped up to various challenges, and maintained an attitude that ensured success.

On behalf of the management staff of Congressional Bank, I want to take this opportunity to personally thank you and your team for the professionalism and commitment demonstrated during our build-out this spring. In a mere three months, our new space was transformed into an awesome office suite. Although a number of items had yet to be completed by the time we moved in, your team met our deadline; we were able to move in on schedule and start working immediately. Bravo!

I wanted to thank you for the excellent work and service that was provided on the Metro Offices project by TRINITY. Throughout the process, each individual from your company performed in a manner that exceeded our expectations-that were high to begin with!

The quality of work is some of the best I have seen in 30 years of running large office build-outs.

That was one of the smoothest jobs I’ve ever been on. Thanks so much for making it a breeze for us!

Our Clients