- +1 (888) 333-9313
- johndoctor@gmail.com
- 838 Ritchie Hwy Unit 6, Severna Park, MD 21146, United States
- Mon - Sat: 9:00am - 9:00pm
We provide window installation, full-home upgrades, and energy-efficient replacements so you get lower heating bills and no drafts.
Factory Certified Installers
Built for Homeowners Who Want Lifetime Warranty Protection and Precision Measuring on Every Opening
Lower Energy Bills
Curb Appeal
Lifetime Protection
You spot the condensation trapped between glass panes, feel the cold air seeping around the frames, and watch your heating costs climb each month. Warped sashes that won’t open, rotted wood around the sill, and faded seals that no longer keep weather out turn a simple problem into a drain on comfort and money.
The longer you wait, the worse it gets. Water finds its way behind the trim, bills keep rising, and the windows you should trust become another repair you can’t afford to ignore.
Window Doctor is a Maryland-based company specializing in custom window manufacturing and factory certified installation. Since our founding, we’ve built our reputation on one simple idea: measure every opening with precision, install to manufacturer specs, and back the work with a lifetime warranty that transfers when you sell.
Our process covers vinyl replacement, double-hung units, energy-efficient upgrades, bay and bow designs, plus matching entry and patio door solutions. Every job begins with exact measurements to ensure factory custom fit, eliminating gaps, drafts, and the operating failures that come from forcing standard sizes into mismatched openings.
We stand behind each installation with a transferable lifetime warranty, adding documented value to your home. When it’s time to move, that warranty follows the property and becomes a selling point backed by our factory certification.
Custom manufactured windows measured precisely for each opening, installed by factory certified technicians, and backed by a lifetime transferable warranty.
Durable vinyl frames resist moisture and rot, maintain efficiency over decades, and eliminate the maintenance cycle that wood demands.
Low-E glass and argon fill reduce heat transfer, cut seasonal utility bills, and stop the drafts that made your old windows uncomfortable.
Projecting window assemblies that add interior space, flood rooms with natural light, and become the architectural focal point from curb to living room.
Custom fit windows eliminate drafts and hot spots so every room maintains the temperature you set without fighting the system.
Low-E glass and argon fill cut heat transfer through the pane, so your HVAC runs less often and monthly costs drop.
A transferable lifetime warranty and upgraded curb appeal give buyers confidence and add documented value when you sell.
Excellent experience from start to finish. Very professional company and staff, always available to help, very quick and easy to communicate with. Prices were reasonable and the team that did the install were fast and courteous. John Lippold, the rep from Window Doctor, was proactive about getting my questions and concerns answered and explained the entire process upfront. Highly recommend!
Charles Grigg
We had our windows replaced before selling our home, and it was one of the best decisions we made. They were able to repair the rotted wood around the windows, which increased the value of our home. We actually made money from the upgrade! The turnaround time was fast, and the whole process was smooth. I would definitely recommend them if you’re looking to replace your windows before selling.
Frieda Reiner
So your home stays comfortable year-round without the drafts, leaks, or energy waste that standard-sized windows leave behind.
Reach out by phone or online to set up a visit that works around your schedule.
We measure each rough opening down to the millimeter so your custom windows fit perfectly.
Factory builds your windows to match our exact measurements, then we confirm your production slot and install date.
Precise measuring to exact specifications before manufacturing your custom windows.
Standard sizes forced into openings.
Factory certified installer with direct manufacturer warranty backing.
No formal training or guarantees.
Lifetime warranty covering both product and installation work.
Limited coverage with confusing terms.
Custom manufactured windows built for your openings to eliminate gaps and drafts.
Off-the-shelf products with improvised fitting.
Warranty transfers to the next owner if you sell your home.
Coverage ends when you leave.
Custom measurements for every opening to ensure precise fit and performance.
With Us
standard sizes forced into openings.
With Them
Lifetime transferable warranty covering product and installation, backed by manufacturers.
With Us
limited coverage with coverage gaps.
With Them
Factory certified installers who meet strict manufacturer standards for quality.
With Us
uncertified installers with inconsistent training standards.
With Them
We handle every step from measurement through installation to prevent drafts, gaps, and operational failures.
With Us
rushed installation causing seal and frame problems.
With Them
Local Maryland company with direct warranty support, so you never face finger-pointing.
With Us
installers blaming manufacturers when problems arise.
With Them
Every opening measured precisely so custom windows fit tight with zero gaps or drafts.
Certified installation meets strict manufacturer standards so your warranty stays valid for life.
Windows built to your exact dimensions instead of forcing standard sizes into odd openings.
Water barriers and flashing installed around every frame to prevent leaks and rot damage.
Lifetime warranty transfers if you sell, adding documented value to your home.
Experienced crew handles each window with proven techniques that prevent operational issues down the line.
Most single-family homes are completed in one to two days. Larger projects with more windows may take an additional day, depending on the total count and unit types.
All work happens from the outside. Your walls, trim, and flooring stay untouched. The crew removes the old units and installs the new frames without entering living spaces.
Rotted framing gets addressed during installation. The team removes damaged wood, treats the opening, and installs the new unit with proper flashing to prevent future rot.
Custom windows are built to your exact opening dimensions, eliminating gaps that cause drafts and operational problems. Standard sizes rarely fit older openings without compromise.
Yes. The warranty covers both product and installation for the life of your home and transfers to the new owner, which adds documented value at resale.
Connect with Window Doctor for precise measurements, factory certified installation, and a lifetime transferable warranty that protects your investment in Crofton for decades.
