About One Source

We furnish and install replacement Windows, Sliding Glass Doors, Balcony Enclosures and Terrace Doors for condominiums throughout the Washington DC, Baltimore, and Northern Virginia area.  Our professional installers will take great care of your home and we make sure every installation is completed to the highest standards.

We have the best pricing, a 100% Guarantee, and are committed to excellent customer service.

Contact us today to schedule your free in-home consultation.

Window Installation Service Columbia

Personalized Approach

Our goal is to provide outstanding customer service and make purchasing replacement windows for condominium owners as easy as possible!

Excellence and Professionalism

With 30 years of Industry experience and specialized focus on condominiums you can be assured that all products will be professionally installed by qualified installation crews and supervised by trained project managers 

Balcony Enclosures services Columbia
Sliding glass doors services Columbia

Licensed and Insured

We are Class A licensed in Virginia and have a Maryland Home Improvement Commission License (MHIC).

Bonded and insured.

MHIC  License # 131028

VA CLASS A License # 2705119365

Meet The Team

President of One Source Window Systems

Bill Marciniak


Director of One Source Window Systems

Brent Murrell

Director of Operatons

Bill Marciniak is President of One Source Window Systems.  Bill has 30 years of industry experience and helps with the day to day operations as well as keeping the company focused on achieving its goals.

Bill started One Source in 2006. He graduated from The University of Maryland's Robert H. Smith School of Business in 1985.  Bill wanted to create a company that valued its customers, rewarded its employees all in keeping with his beliefs in staying positive and being nice to people

In addition Bill is a competitive cyclist having recently finished 7th in the Mountain Bike National Championships! (age group :)

Bill attributes his success to his wife Kelly who has been instrumental in helping to guide and grow the business.

Brent Murrell is Director of Operations.  Brent graduated from the University of Maryland, where he focused on Environmental Engineering.


Working closely with both office staff and field crews, Brent facilitates company growth by ensuring maximum productivity throughout the organization.  Starting as a project manager, his on-site experience, engineering background, and business aptitude allowed him to quickly become an asset to our company. 


Outside of work Brent enjoys fishing, hiking, running, and most of all, spending quality time with his wife.

office manager of One Source Window Systems

Elyse Fenton

Office Manager

Elyse Fenton is the office manager and information technology expert.

Elyse has a bachelor of science degree from Florida State University and MBA from Cal Southern University.  She has been instrumental in developing the information systems that have helped One Source streamline operations and increase efficiency.  

Elyse is a certified tennis coach and lifelong learner.

sales representative at One Source Window Systems

Andrew McCauley

Sales Representative

Andrew McCauley is currently a sales representative at One Source Window Systems.  

Andrew has a B.S. in Business Management from Salisbury University with an emphasis in Information Systems Management.


Andrew currently resides in Arlington Va, is an avid sports fan and mean karaoke singer!

Project Manager at OneSource Window

Angelica Jacome

Project Manager

Angelica graduated from Colombia’s Universidad Autonoma de Occidente with a BA in Digital Communications in 2016.


Angelica is currently a Project Manager at OneSource Window Systems, managing the install process in both commercial and condominium properties. Angelica is experienced in customer service and managing projects from start to finish.

Angelica is originally from Colombia South America and is fluent in Spanish.

Joe Thomas

Service Technician

Joe Thomas is from Catonsville MD. 


Joe is currently an Assistant Project Manager at One Source Window Systems responsible for helping supervise the individual condominium division installations.

In his free time, Joe enjoys most things on 2 wheels.