Trust your HVAC & Plumbing needs to the experts!

For more than 125 years, we have been bringing timely solutions on our customers’ timetable and budget. Contact us today to learn more about how we can save you money, extend the life of your equipment, and prevent surprise capital costs.

a mechanical contractor with history

Since the late 1800s, W. L. Gary Company has been providing quality mechanical services throughout the DC metropolitan area. We are licensed to work in DC, Maryland, and Virginia. W. L. Gary Company is named as a Certified Business Enterprise in DC. Our licensed Journeymen and women and Master Mechanics are certified in a wide array of plumbing and HVAC specialties.

W. L. Gary Company’s mission is to provide Solutions for our Clients, Opportunity for our Partners, and Support to Our Community.

W. L. Gary Company strives to be the preferred provider of value-added, full service mechanical solutions for our growing family of clients while giving opportunity for growth and prosperity to our current and future partners all in a manner that enhances our community.

Licensed to work in DC, Maryland, and Virginia, W. L. Gary Company, Inc. is named as a Certified Business Enterprise in DC. Our licensed Journeymen and women and Master Mechanics are certified in a wide array of plumbing and HVAC specialties.

Safety is not just an idea – it is an action.  At W. L. Gary Company, we promote safety as a constant action to be taken by all levels of employees. Here are some of the components of our safety program:

  • Team members provided with protective equipment to keep all partners safe
  • Weekly safety toolbox meetings held on job sites
  • Jobsite evaluations to help maintain a safe work environment for our partners
  • Throughout all levels of the company all employees are encouraged to contact our safety director or upper management with any safety concern so that it can be addressed and a safe work environment can continue

On Time

24/7, 365 days a year - our Service Department is ready to handle your emergencies so you're back up and running.

On Budget

We recognize that mechanical infrastructure represents a large portion of a building's operating budget. Our solutions are always tailored with your budgetary needs in mind.

Skilled Team Members

Our team is the most qualified and experienced in the region, and when you work with W. L. Gary Company you can rest assured you're working with the finest technical talent available.

Timeless Reputation

More than 125 years of doing right by our clients have earned us a reputation within our community. We do the right thing because it's what our founders would want, and it's what our clients deserve.


They guide our every action at W. L. Gary. We live and work by these guiding principles.

Our rich 125-year history defines our legacy.

Longevity is no accident.

What People Think About Us

Thanks to JohnnyGo’s team my house is now as good as new! They helped me to renew my roof, fixed the heating system and rewired the house. I’m very grateful as I could never do it alone! These guys are very careful, skilled and indeed fast!

Adam Smith teacher

It was my first time to request the assistance of professional maintenance team as previously I used to do everything by myself. They painted my facade carefully and my wife is very pleased that it was done so delicate and fast.

David Jones manager

I was recommended to use JohnnyGo by my co-worker. I needed an emergency help because of insects, and they helped me to resolve this problem so quick! I’ll definitely get back again as they have so many useful services!

Mag Richards accountant

our associations