Quick answer: Door and window replacement companies in Maryland differ by service area, residential or commercial focus, product selection, showroom access, and installation scope. This guide compares ten Maryland-area providers and suppliers, with current contact details and a practical checklist for verifying licensing, product performance, warranties, and written estimates.
Reviewed and substantially updated July 27, 2026. We retained the ten companies already featured on this page, checked current public information, and rewrote the guide to make the choices easier to compare. Inclusion is not a certification, endorsement, or warranty. Businesses can advertise with Maryland Recommendations, but advertising does not purchase editorial order or a positive recommendation.
Compare the 10 door and window companies
| Company | Primary Maryland base or area | Project focus | Phone |
|---|---|---|---|
| Capitol Improvements | Bowie and Gaithersburg | Residential windows, doors and exterior projects | 301-769-6909 |
| Quality Window & Door | Beltsville | Residential, commercial and historic projects | 301-960-5864 |
| Cypress Door & Glass | Baltimore area | Commercial doors and glass | 410-995-7177 |
| Brothers Services | Hampstead | Residential doors, windows and broader remodeling | 410-834-4583 |
| Colonial Sash & Door | Frederick | Building-product supplier; currently builder-only | 301-695-4041 |
| Maryland Windows & Doors | Baldwin | Residential replacement windows and doors | 443-998-2957 |
| Master Seal | Parkville / DMV | Doors, security doors and replacement windows | 855-608-1580 |
| ClearView Window & Door | Parkville | Residential windows and doors with showroom | 410-668-1110 |
| Bel Air Window & Door Solutions | Bel Air | Local residential replacement and installation | 410-941-6988 |
| Rockville Window & Door | Rockville | Windows, doors and exterior improvements | 301-208-3580 |
Company services and contact details were checked against official websites on July 27, 2026. Confirm service area, availability, licensing and quote terms directly before hiring.
How we organized this Maryland shortlist
This is a practical regional shortlist, not a claim that one company is objectively best for every home or commercial property. We reviewed each provider’s official website, Maryland location or stated service area, project type, product or installation focus, and current public contact information. We also separated residential installers, commercial door-and-glass specialists, and building-product suppliers because those businesses solve different problems.
Before choosing, confirm the company serves your ZIP code and handles your exact project. For regulated home-improvement work, use the Maryland Home Improvement Commission license search. The state’s consumer advice also explains contract, deposit and complaint considerations.
10 door and window replacement companies in Maryland
1. Capitol Improvements
Capitol Improvements is a fit to compare when a door or window project is part of a broader exterior upgrade. Its official website lists replacement windows and doors alongside roofing, siding, gutters, trim and decks, with Maryland offices in Bowie and Gaithersburg. That broader scope may simplify projects involving several exterior systems, but ask for an itemized proposal so product, labor and warranty responsibilities remain clear.
Contact: Bowie, MD | 301-769-6909
Useful for: Residential window, door and multi-trade exterior projects.
Useful for: Residential window, door and multi-trade exterior projects.
2. Quality Window & Door, Inc.
Quality Window & Door operates showrooms in Beltsville, Maryland, and Fairfax, Virginia. The company’s official site says it works on residential, commercial and historic projects and offers both replacement and new-construction windows. Its catalog spans common window styles and entry, patio, French and large-opening door systems. It is worth comparing when product selection or an in-person showroom visit matters as much as installation.
Contact: Beltsville, MD | 301-960-5864
Useful for: Homeowners, commercial properties and historic-project product selection.
Useful for: Homeowners, commercial properties and historic-project product selection.
3. Cypress Door & Glass, LLC
Cypress Door & Glass is the commercial specialist on this list. Its Baltimore-area page focuses on commercial doors, storefront glass and related service rather than standard residential replacement packages. Property managers, facility teams and business owners should ask about the exact door or glazing system, emergency-service availability, hardware compatibility, permitting and whether the proposal covers repair, replacement or a full opening.
Contact: Baltimore area | 410-995-7177
Useful for: Commercial doors, storefronts, glazing and facility work.
Useful for: Commercial doors, storefronts, glazing and facility work.
4. Brothers Services
Brothers Services is a Maryland remodeling company whose exterior division includes replacement doors and windows. Its door information emphasizes treating the opening as a complete system involving framing, insulation, siding and masonry. This makes the company relevant for homeowners whose project may involve more than swapping a product into an unchanged opening. Ask who performs each trade and how the labor and manufacturer warranties are divided.
Contact: Hampstead, MD | 410-834-4583
Useful for: Residential replacement work connected to larger exterior remodeling.
Useful for: Residential replacement work connected to larger exterior remodeling.
5. Colonial Sash & Door, Inc.
Colonial Sash & Door is a Frederick building-products supplier with windows, doors, trim, millwork, cabinetry and other materials. A critical current limitation appears on the company’s official website: it is selling only to builders, and its showroom is closed until further notice. Homeowners should not assume direct retail access. Builders and remodelers can contact the company to confirm account eligibility, product availability and lead times.
Contact: 260 Interstate Circle, Unit 1, Frederick, MD 21701 | 301-695-4041
Useful for: Builders sourcing windows, doors and related building products.
Useful for: Builders sourcing windows, doors and related building products.
6. Maryland Windows & Doors
Maryland Windows & Doors presents itself as a residential replacement-window and door company serving the region from Baldwin. It is a straightforward option to include in a quote comparison for homeowners focused on the opening itself rather than a large commercial glazing job. Confirm the brands and models proposed, installation method, disposal of old units, interior and exterior trim work, permit responsibility and the written labor warranty.
Contact: Baldwin, MD | 443-998-2957
Useful for: Residential replacement windows and exterior doors.
Useful for: Residential replacement windows and exterior doors.
7. Master Seal Doors & Windows
Master Seal focuses on exterior doors and replacement windows across Maryland and the greater DMV area. Its official website lists steel and fiberglass entry doors, storm and security doors, patio doors, vinyl replacement windows, and bay, bow, garden and glass-block styles. Homeowners prioritizing a front-door or security-door project may find the product focus useful. Confirm current coverage for your county and request the exact warranty documents before signing.
Contact: Parkville / DMV | 855-608-1580
Useful for: Entry, storm and security doors plus residential replacement windows.
Useful for: Entry, storm and security doors plus residential replacement windows.
8. ClearView Window & Door
ClearView is a residential window-and-door company with a Parkville showroom. Its official site lists service across Baltimore City and multiple Maryland counties, including Anne Arundel, Baltimore, Carroll, Cecil, Frederick, Harford, Howard, Montgomery and Prince George’s. A showroom can help homeowners compare glass packages, finishes, hardware and operating styles before an in-home estimate. Verify that the specific product line quoted is certified for the appropriate climate zone.
Contact: 3316 Putty Hill Avenue, Baltimore, MD 21234 | 410-668-1110
Useful for: Homeowners who want in-person product comparison and broad central-Maryland coverage.
Useful for: Homeowners who want in-person product comparison and broad central-Maryland coverage.
9. Bel Air Window & Door Solutions
Bel Air Window & Door Solutions serves homeowners in Bel Air and surrounding Harford County communities. Its official site focuses on local replacement windows and exterior-door installation, making it a relevant comparison for a residential project in the Bel Air, Fallston, Aberdeen, Havre de Grace or Abingdon area. Confirm the legal contracting entity, current Maryland license, product manufacturer, installation crew and warranty terms during the estimate.
Contact: Bel Air, MD | 410-941-6988
Useful for: Local residential window and door projects in and around Harford County.
Useful for: Local residential window and door projects in and around Harford County.
10. Rockville Window & Door Co.
Rockville Window & Door serves the Montgomery County market and lists windows, exterior doors and related exterior improvements on its official site. It belongs on a comparison when a Rockville-area homeowner wants a local proposal or expects windows and doors to overlap with siding, roofing, gutters or shutters. Ask the estimator to separate optional exterior work from the core opening replacement so competing quotes remain comparable.
Contact: Rockville, MD | 301-208-3580
Useful for: Montgomery County residential windows, doors and related exterior work.
Useful for: Montgomery County residential windows, doors and related exterior work.
What to compare before signing a contract
1. License and legal business name. Search the contractor through Maryland’s MHIC system and make sure the name on the proposal matches the licensed entity.
2. An itemized scope. The quote should identify product line and model, quantity, glass package, frame material, installation method, trim or capping, disposal, permits, cleanup and any repair allowances.
3. Product-performance labels. ENERGY STAR advises shoppers to look for certification appropriate to the climate zone and to retain the ENERGY STAR and NFRC labels. The NFRC ratings help compare U-factor, solar heat gain and other performance values; they are not a contractor-quality score.
4. Warranty responsibility. Separate the manufacturer’s product warranty from the installer’s labor warranty, and ask who handles service if glass, hardware, seals or installation fail.
5. Several comparable quotes. Ask each company to price the same scope. ENERGY STAR specifically recommends quotes from several installers and a labor-and-material breakdown.
2. An itemized scope. The quote should identify product line and model, quantity, glass package, frame material, installation method, trim or capping, disposal, permits, cleanup and any repair allowances.
3. Product-performance labels. ENERGY STAR advises shoppers to look for certification appropriate to the climate zone and to retain the ENERGY STAR and NFRC labels. The NFRC ratings help compare U-factor, solar heat gain and other performance values; they are not a contractor-quality score.
4. Warranty responsibility. Separate the manufacturer’s product warranty from the installer’s labor warranty, and ask who handles service if glass, hardware, seals or installation fail.
5. Several comparable quotes. Ask each company to price the same scope. ENERGY STAR specifically recommends quotes from several installers and a labor-and-material breakdown.
For product research, use the official ENERGY STAR windows, doors and skylights guide and performance-rating explanation. If painted surfaces may be disturbed in a home built before 1978, the EPA Renovation, Repair and Painting program explains lead-safe certification requirements.
Related Maryland home-improvement guides
Continue your research with our guide to window installation companies in Maryland, compare broader Maryland contractors, or browse the full Top 10 directory.
Frequently asked questions
How do I choose a window and door company in Maryland?
Start with project fit and service area, then verify the contractor’s current Maryland license where required. Compare itemized quotes for the same product specifications, installation method, trim work, disposal and warranty coverage. A company suited to a commercial storefront may not be the right choice for residential replacement windows.
How many estimates should I get?
Get several written estimates for the same scope. ENERGY STAR advises comparing quotes from several installers and asking for labor and materials to be separated. A low total is difficult to evaluate if the glass package, installation method, trim, permits or labor warranty differ.
Should replacement windows have ENERGY STAR and NFRC labels?
Those labels answer different questions. ENERGY STAR identifies products that meet EPA efficiency criteria for the applicable climate zone. NFRC labels report independently certified performance values used to compare products. Neither label measures installation quality, so product specifications and installer qualifications both matter.
What should owners of pre-1978 homes ask?
Ask whether the project will disturb painted surfaces and whether the firm is certified for lead-safe renovation work. EPA’s RRP rule generally requires paid firms working in pre-1978 housing and child-occupied facilities to be certified and use lead-safe practices, subject to the rule’s details and exemptions.
Can a company pay to rank higher in this list?
No. Advertising, sponsored placements and guest-post opportunities are handled separately from editorial order. Paid links are identified as sponsored, and payment does not guarantee a positive assessment. To discuss a clearly labeled campaign, visit our advertise page or contact us.
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