Basement Window Specialists
Glass block, hopper windows, and code-compliant egress windows for basements across the DMV. Upgrade your basement with more light, better security, and proper code compliance.
Many older homes in Arlington, Bethesda, Silver Spring, and DC have small, deteriorating basement windows. We replace them with modern, energy-efficient windows that transform your basement into usable living space.
Basement Window Services
Whether you need a simple window swap, a full egress installation, or glass block for security, we handle every type of basement window project.
Durable, secure, and energy-efficient glass block basement windows that allow natural light while providing superior resistance to break-ins,
Top-hinged hopper windows that tilt inward for ventilation while resisting rain and debris. Available in vinyl, fiberglass,
Code-compliant egress windows that meet IRC requirements for bedroom and habitable basement spaces. Full-service installation including opening enlargement,
Properly sized and drained window wells for below-grade egress windows. Includes excavation, corrugated or masonry wells, drainage gravel,
Replace old single-pane basement windows with double-pane Low-E insulated units. Reduce heat loss, eliminate drafts,
Polycarbonate glazing, security film, and reinforced frames for basement windows that are vulnerable to break-in.
Our Process
We evaluate your existing windows, measure openings, check for moisture issues, and determine if egress sizing or code upgrades are needed for your project.
Based on your goals -- light, security, code compliance, or energy efficiency -- we recommend the right window type, glass, and frame material with a detailed written proposal.
Our crew handles everything: old window removal, opening enlargement if needed, framing, window installation, waterproofing, and window well work. Clean, efficient, and code-compliant.
We verify proper operation, seal integrity, and code compliance. For egress installations, we coordinate with your local building inspector. You receive full warranty documentation.
The Expert Glass Advantage
Every egress window installation meets IRC requirements -- 5.7 square feet minimum opening, proper sill height, and correct window well dimensions.
Old basement windows are a common entry point for burglars. Glass block, polycarbonate glazing,
Modern double-pane Low-E basement windows dramatically reduce heat loss and eliminate cold drafts. Many homeowners report noticeable energy savings after replacing old single-pane basement windows.
Larger windows, clear glass options, and properly designed window wells transform dark basements into bright, usable living spaces. More light means more value from your finished basement.
Energy Efficiency
Old single-pane basement windows are one of the biggest sources of heat loss in DMV-area homes. Cold air pours in during winter, hot air seeps in during summer, and your HVAC system works overtime to compensate. Replacing them pays for itself in energy savings.
1.0+ (poor insulation)
0.25-0.30 (excellent)
0.35-0.50 (very good)
10-25% on heating/cooling
U-Factor measures heat transfer -- lower numbers mean better insulation. Modern basement windows provide 3-4x better insulation than the single-pane windows found in most older DMV homes.
Window Types
Each window type serves a different purpose. We help you select the right solution based on your basement use, code requirements, and goals.
Non-egress basement windows where security and waterproofing are priorities
Maximum security, excellent insulation, waterproof, diffused natural light
Standard basement windows needing ventilation and light
Top-hinged for rain resistance, easy to operate, available in many sizes
Basements with bedrooms or habitable spaces requiring code-compliant emergency exit
Meets IRC 5.7 sq ft minimum, casement or sliding operation, full escape access
Wide basement openings where a horizontal sliding operation is preferred
Easy to operate, good ventilation, available in egress-compliant sizes
Code Requirements
If your basement has a bedroom or habitable space, the International Residential Code requires at least one egress window meeting these specifications:
5.7 square feet
24 inches
20 inches
44 inches from floor
9 square feet (if below grade)
36 inches minimum from wall
Virginia, Maryland, and DC all adopt IRC egress requirements. Local amendments may apply -- we verify current codes for your jurisdiction before installation.
Common Problems We Solve
Most basement window problems fall into a few common categories. Here is what we see most often and how we fix it.
Replace with double-pane Low-E insulated units that eliminate cold air infiltration and reduce energy costs. Most homeowners notice an immediate improvement in basement comfort.
Old wood and steel frames deteriorate over time. We remove the entire assembly and install new vinyl or fiberglass frames that resist rot, rust, and require zero maintenance.
If your basement bedroom has windows that are too small for egress, we cut and frame a larger opening, install a code-compliant window, and add a properly drained window well.
Improperly sealed or deteriorated basement windows allow water intrusion. We install new windows with proper flashing, sealant, and drainage to eliminate leaks.
Ground-level basement windows are vulnerable to break-ins. Glass block, polycarbonate glazing, and reinforced frames provide security without sacrificing light.
Condensation between panes means a failed seal. We replace the insulated glass unit or the entire window to restore clarity and insulation performance.
Service Areas
Older homes throughout the DC area have basement windows that need upgrading. We serve homeowners in these neighborhoods and beyond.
Many 1940s-1960s ramblers and Cape Cods with small, original basement windows. Homeowners finishing basements for home offices and guest suites need egress upgrades.
Split-level and colonial homes with aging basement windows. High property values make basement renovations a popular way to add livable square footage.
Older bungalows and mid-century homes with undersized basement windows. Glass block and egress upgrades are common renovation projects in these neighborhoods.
Row houses and townhomes with below-grade English basements. Window well installations and egress compliance for rental units and ADUs.
Colonial and mid-century homes along the Route 1 corridor. Basement finishing projects frequently require new egress windows to meet code.
Split-foyer and colonial homes from the 1970s-1990s. Basement window upgrades for energy efficiency, security, and finishing projects are common.
DMV Renovation Trends
Basement finishing is one of the most popular home improvement projects in the DMV. Here are the trends driving basement window replacement demand across our service area.
Remote work has made finished basements with natural light a top priority for DMV homeowners. Egress windows and larger hopper windows bring the light needed for a productive workspace.
New ADU regulations in Arlington, Fairfax, and Montgomery County are driving basement-to-apartment conversions. Every ADU bedroom requires a code-compliant egress window.
Multi-generational living is on the rise. Basement guest suites need egress windows, adequate light, and proper ventilation -- all of which start with the right windows.
Homeowners are converting basements into gyms and wellness areas. Larger windows improve ventilation, natural light, and the overall feel of underground workout spaces.
Home theaters and entertainment rooms benefit from glass block windows that provide subtle ambient light during the day while maintaining the dark, enclosed feel needed for movie viewing.
A properly finished basement with code-compliant windows can generate significant rental income in the DMV market. Egress windows are required before a basement can be legally rented.
Why Upgrade Now
Basement windows are often the most neglected windows in a home. They get painted shut, they fog up, their frames rot, and homeowners forget about them -- until they try to finish their basement or sell their house.
New basement windows deliver an outsized return on investment. They bring natural light into dark spaces, eliminate drafts and moisture problems, improve security, and bring your home up to current building codes -- all of which add real value.
For homeowners in the DMV area who are finishing their basements, adding a bedroom, or creating an accessory dwelling unit, egress window installation is not optional -- it is required by code. We handle the entire process from permit to final inspection.
Basement Window FAQ
Answers for homeowners considering basement window replacement, egress upgrades, or glass block installation in the DMV.
Get Started Today
Free basement window assessment. Egress code compliance, glass block security, and energy-efficient upgrades for homes throughout DC, Virginia, and Maryland.
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