About Us

Tri County Windows and Siding is family owned and operated by long-term Northern Virginia residents, Tim and Arada Grantz. Tim worked as a sales manager for a national wholesale distributor of exterior building materials for 18 years, and Arada has been in residential real estate for over 20 years. Tim, along with his nephew, Tyler, who has an extensive background in storm restoration, interface directly with homeowners while Arada runs the backend of the business.

Tri County has been installing high quality products and providing world class service to Northern Virginia homeowners for over a decade. Tim’s extensive knowledge of building products and relationships with installers from his days in distribution has uniquely positioned Tri County to partner with the best manufacturers in the industry and to align ourselves with unmatched installation technicians, most of whom we’ve known or worked with directly for over 20 years.

We value and appreciate each and every interaction we have with perspective customers and live by the Golden-Rule of treating everyone as we would want to be treated. This common sense approach has enabled us to grow through the years, primarily through referrals and repeat business, ultimately making Tri County Windows and Siding Northern Virginia’s most trusted Home Improvement Company for Windows, Doors, Siding, Roofing, Gutters and Trim.

Our customers contact us requesting an estimate, and we offer a free, no-hassle, consultative sales process with fair, very competitive pricing. You will never find us knocking doors, canvassing neighborhoods soliciting business, and we don’t practice sales gimmicks like calling a sales manager to get you a better price or offer discounts of 30 – 40% if you “sign tonight”. We don’t even carry contracts with us! We do, however, offer modest discounts for those who serve/served in our Military, 1st Responders, Teachers and Senior Citizens.

We value and appreciate everyone who gives us the privilege to work for them and will continue to do our best to exceed their expectations. We don’t measure our success by dollars and cents but rather the thousands of satisfied customers who have referred us to family and friends over the years. We also credit our success to our valued manufacturer and supplier partnerships and our topnotch installation crews. We thank everyone who has contributed to our growth and success and strive to be better each and every day!