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Your Trusted Window & Door Installation Experts
B.T. Window & Doors is an owner-operated company dedicated to enhancing homes through premium window and door installation services. With over 20 years of industry experience, our team combines hands-on expertise from manufacturing to installation, ensuring every project meets the highest standards of quality and craftsmanship. We pride ourselves on personalized service, with the owner present on every job site to guarantee client satisfaction. Our commitment to excellence is reflected in our OSHA-certified technicians, BBB accreditation, and U.S.

EPA Lead-Safe certification. We specialize in energy-efficient solutions that reduce utility bills while boosting property value, serving Maryland and Pennsylvania homeowners with integrity and transparency. Our process prioritizes clear communication, meticulous attention to detail, and post-installation cleanup, ensuring a seamless experience from consultation to completion. We offer competitive pricing, military/veteran/senior discounts, and accept multiple payment methods to accommodate diverse client needs.
Services
Window installation Door installation Energy-efficient windows Custom window design Glass replacement Grid options Entry doors Patio doors French doors Window repair
Highlights and features
  • Owner oversees every project to ensure quality and satisfaction.
  • 20+ years of hands-on experience in window and door installation.
  • OSHA-certified technicians and BBB-accredited business.
  • Free estimates with no hidden fees or subcontractors.
  • 10% discount for military personnel, veterans, and seniors.
Associations and certifications
  • BBB
  • OSHA
  • U.S. EPA Lead-Safe
  • Installation Master Certified
What people say
Fantastic experience Excellent workmanship Timely manner Professional and knowledgeable No hidden fees
Services
Window Installation
Our window installation service enhances home energy efficiency and curb appeal. We offer double-pane, triple-pane, and Low-E glass options to reduce heating and cooling costs. Each installation is performed by certified technicians with precision and care.
Door Installation
We install durable entry, French, and patio doors that improve security and aesthetics. All doors include standard locks and are installed by OSHA-certified professionals. Our options feature energy-efficient designs to lower utility bills.
Energy-Efficient Windows
Our energy-efficient windows use advanced glazing technologies to reduce UV exposure and HVAC strain. Double-pane and triple-pane options with argon gas fillings help homeowners save 10-25% on energy bills while maintaining indoor comfort.
Custom Window Design
We create tailored window solutions for unique architectural styles. Options include bay/bow windows, garden windows, and specialty shapes. Our team ensures precise measurements and seamless integration with existing home structures.
Glass Replacement
Our glass replacement service addresses cracked or fogged panes in existing windows. We use tempered and laminated glass options to restore functionality and appearance. The process minimizes disruption while extending window lifespan.
People
Tomasz Bilich
Owner/Operator
Tomasz Bilich, owner of B.T. Window & Doors, has 20+ years in residential window/door installation. He learned manufacturing processes before mastering installations, ensuring product expertise. Tomasz prioritizes hands-on oversight and customer education for every project.
Patricia Bilich
Vice President of Customer Service
Patricia Bilich manages customer relations with a focus on clear communication and satisfaction. Her role ensures seamless coordination between clients and installation teams, maintaining the company's commitment to personalized service.
Questions
Do you offer free estimates?
Yes, we provide free estimates with no obligation. Contact us via phone or our website form to schedule a consultation.
Are your installers certified?
All technicians are OSHA-certified, and the company holds BBB accreditation and U.S. EPA Lead-Safe certification for safety and quality.
What areas do you serve?
We serve Maryland (Montgomery, Howard, Carroll, Frederick counties) and Pennsylvania (Gettysburg, Hanover, York areas).
Do you offer energy-efficient options?
Yes, we install double/triple-pane windows, Low-E glass, and argon gas-filled units to improve energy efficiency and reduce utility costs.
Are discounts available?
We offer a 10% discount for military personnel, veterans, and senior citizens with code USHERO.
What payment methods do you accept?
We accept cash, checks, debit cards, and all major credit cards for your convenience.
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