About Us

Hi, I’m Seth Fensterstock. I founded Windows Only in 1998 in my hometown of Bethesda, Maryland. After working for several years for other window cleaning companies, I found myself dissatisfied with the way those businesses sacrificed quality and safety to make a buck. I decided to try going into business for myself. With those early experiences in mind, I have built Windows Only around the principles of professionalism, safety, superior workmanship and outstanding customer service.

Starting as a small, one-man operation focusing only on window cleaning, I have grown Windows Only into a successful business that today offers many services to Montgomery County. We’re not just “Windows Only” anymore! That’s still our name, but now we also offer exterior house washing, roof washing, gutter cleaning, and more.

In 2014, my wife Kate, also from Bethesda, joined me.  She runs our office as well as our family!

Professionalism and safety are always at the top of our list, as well as making your experience with us as hassle free as possible, from start to finish.

Although Windows Only continues to grow, I work hard to ensure that my employees are trained properly both in performance and safety to make certain my customers receive the quality of service they have come to expect from Windows Only.