Veterans & active duty military: 10% off, up to $1,000. Mention it at your estimate.
We’ve replaced windows and doors all over Charles County — Waldorf and St. Charles, La Plata, Bryans Road, Indian Head, Hughesville, and White Plains. That covers townhouse window packages, single-family whole-house replacements, new entry doors, and patio door upgrades.
Our window work is built around Andersen windows and Supreme Aluminum products, and we order doors, hardware, and trim through Build.com.

Charles County makes this easy to answer. The Department of Planning & Growth Management’s own list of work that doesn’t need a residential permit includes replacing existing windows and doors, along with storm windows, storm doors, and screens. The same list draws the line clearly: new openings require a building permit. So a like-for-like replacement can usually start as soon as the product arrives, while a new patio door cut into a wall goes through the county’s Citizen Self Service portal first.
In St. Charles, check with your village’s Planning and Design Review Board before changing how the outside of the house looks — each village sets its own list of exterior changes that need approval. Homes inside the Town of La Plata follow the town’s own building permit process.
Our process begins with a free in-home consultation and precise measurements. We help you select window styles, door configurations, glass packages, and energy ratings that match your home and performance goals. Our crews remove old units, make any needed frame repairs, and install new windows and doors with proper shimming, sealing, flashing, and interior and exterior trim. We haul away all old materials when the job is complete.
Davis Construction installs Energy Star-certified windows and doors that can reduce heating and cooling costs by up to 15 percent annually. For homeowners across Charles County, those savings add up significantly over the life of the windows. We walk you through energy performance ratings – U-factor, solar heat gain coefficient, and visible transmittance – so you can make an informed product choice before committing.
As your Charles County window and door contractor, we install double-hung, casement, awning, bay, bow, picture, and sliding windows, plus entry doors, storm doors, sliding glass doors, French doors, and patio doors. We offer vinyl, wood, fiberglass, and aluminum-clad frame options in a variety of colors and finishes. Our team helps you choose products that improve your home’s appearance while delivering the energy performance and security you need.
Even the best windows underperform when installed improperly. Missing flashing, improper air sealing, or incorrect shimming leads to drafts, water intrusion, and premature failure. Davis Construction’s installation teams are trained in window and door best practices. Every unit is installed to manufacturer specifications and sealed to prevent air and water infiltration – protecting your home and your product warranty coverage.
Most window replacement projects in Charles County are completed in one to two days. A whole-home replacement with 10 to 20 windows typically takes one to two days depending on the number and complexity of units. Door replacements are usually done in a single day. We work efficiently and leave your home clean at the end of each workday.
Usually not for a straight replacement. Charles County lists replacement of existing windows and doors, and storm windows, doors, and screens, as not needing a residential permit. New openings do need a building permit, and we pull it when your project calls for one.
Stop losing money through inefficient windows and doors. Davis Construction is a licensed window and door contractor serving Charles County and the rest of Southern Maryland. We offer free in-home consultations, transparent pricing, and professional installation backed by a workmanship warranty. Contact us today to schedule your free estimate and start saving energy in your home.