Licensed & Insured -- Fully Insured
Foggy, cloudy, or moisture-filled windows mean a failed seal. We replace insulated glass units -- double-pane, triple-pane, Low-E, and argon-filled -- to restore clarity, comfort, and energy efficiency without replacing the entire window frame.
What We Do
An insulated glass unit (IGU) -- sometimes called a sealed unit or thermal pane -- is the glass sandwich at the heart of every modern window. Two or three panes of glass are separated by spacer bars and hermetically sealed, with the cavity between panes filled with an insulating gas like argon or krypton.
When the perimeter seal fails, the insulating gas escapes and humid air infiltrates the cavity. The result is permanent fogging, lost energy efficiency, and compromised comfort. But in most cases, the window frame, sash, and hardware are perfectly fine. That is where we come in.
Expert Glass Repair specializes in replacing the failed glass unit while preserving your existing frames. We custom-fabricate each IGU to your exact measurements with your choice of glass type, coatings, and gas fill. The result is a like-new window at a fraction of the cost of full replacement.
IGU-Only Replacement
We remove the failed sealed glass unit and install a brand-new IGU into your existing frame. Same frame, same trim, same hardware -- new glass. Costs significantly less than full window replacement and takes 30-60 minutes per window on-site.
Full Window Replacement
Only necessary when the frame itself is rotted, warped, or severely outdated. Full replacement includes new frame, sash, hardware, and trim -- a major renovation project. We recommend this only when frames are beyond repair.
Not sure which option you need? We provide free on-site inspections to assess your frames and recommend the most cost-effective solution.
Schedule a Free InspectionGlass Options
From standard double-pane replacements to ultra-premium triple-pane krypton-filled units, we offer the full range of insulated glass configurations for every budget and performance need.
Two panes of glass separated by a sealed air or gas-filled cavity. The industry standard for energy-efficient windows, double-pane IGUs dramatically.
Three panes with two insulating cavities deliver the highest thermal performance available in standard window configurations.
Low-emissivity coatings applied to one or more glass surfaces inside the IGU reflect infrared heat while allowing visible light through.
Argon gas is denser than air and provides superior insulation when sealed between the glass panes.
Krypton gas offers even higher insulation than argon, making it the top choice for triple-pane units and applications where the gas cavity is narrow.
Combines insulated glass technology with a laminated inner pane for exceptional noise reduction, safety, and security.
We provide free consultations and on-site measurements. Our technicians will recommend the right IGU configuration for your home, your climate, and your budget.
Energy Performance
Insulated glass is rated by industry-standard metrics that quantify thermal performance. Understanding these numbers helps you choose the right IGU for your home and the DMV climate.
R-Value
Up to 7.0
R-value measures resistance to heat flow. Higher is better. Single-pane glass has an R-value of about 0.9.
U-Factor
As low as 0.15
U-factor measures how much heat passes through the glass. Lower is better. Energy Star requires U-factors at or below 0.30 for the DMV region.
SHGC
0.20 - 0.40
Solar Heat Gain Coefficient measures how much solar radiation passes through the glass. Lower SHGC means less summer heat gain.
Energy Savings
Up to 30%
Replacing failed or outdated insulated glass with new Low-E, gas-filled IGUs can reduce heating and cooling costs by up to 30 percent.
Washington DC, Northern Virginia, and Maryland experience hot, humid summers (often above 90 degrees F) and cold winters (frequently below freezing). This dual-season climate demands insulated glass that performs in both directions -- blocking summer heat gain and preventing winter heat loss.
For the DMV region (IECC Climate Zone 4), Energy Star requires a maximum U-factor of 0.30 and maximum SHGC of 0.40. Our standard double-pane Low-E IGUs meet these requirements, and our triple-pane options significantly exceed them for homeowners who want the highest performance.
Replacing failed or outdated insulated glass typically reduces heating and cooling costs by 15 to 30 percent, depending on how many windows are upgraded and the starting condition. Most homeowners in the DMV recoup the cost of IGU replacement through energy savings within three to seven years.
The Benefits
Properly sealed insulated glass units deliver comfort, efficiency, and protection that single-pane or failed double-pane windows simply cannot match.
Insulated glass creates a thermal barrier that keeps conditioned air inside. Rooms stay warmer in winter and cooler in summer, with fewer drafts and cold.
New IGUs with Low-E coatings and gas fill reduce heat transfer through windows by up to 50 percent.
The sealed air space between panes dampens sound transmission. Double-pane IGUs reduce outside noise by 25-35 percent; triple-pane and laminated options.
Properly sealed insulated glass keeps the interior pane warmer than single-pane glass, preventing the surface condensation that leads to mold, mildew, and.
Low-E coatings block up to 99 percent of harmful UV rays that fade furniture, hardwood floors, artwork, and fabrics.
Modern insulated glass is optically clear with no visible distortion. Low-E coatings are invisible to the naked eye.
Two or three panes of glass are significantly harder to break through than one. Laminated IGU options add an additional layer of impact resistance and.
Energy-efficient windows are a top selling point for homebuyers. Replacing failed IGUs eliminates red flags on home inspections and demonstrates.
When to Act
Insulated glass seal failure is progressive. The sooner you address it, the less energy you waste and the less damage moisture causes. Watch for these warning signs.
Persistent cloudiness, fog, or moisture trapped between the glass panes that cannot be wiped away from either side.
White or chalky residue on the interior glass surfaces inside the sealed unit. These mineral deposits form as moisture repeatedly evaporates and.
Noticeable temperature drops when standing near windows, even when they are closed.
Unexplained increases in heating or cooling costs can indicate that insulated glass units have lost their gas fill and thermal performance, forcing your.
Glass panes that appear bowed inward or outward, or views that look distorted through the window.
Cracked, shrunken, or discolored sealant visible around the perimeter of the glass unit.
Noticing any of these signs? Contact us for a free inspection and estimate.
Request Free InspectionOur Process
From initial inspection to final quality check, our IGU replacement process is designed for precision, efficiency, and minimal disruption to your home or business.
We inspect every window to confirm seal failure, assess frame condition, and take precise measurements.
Based on your needs and budget, we specify the optimal IGU configuration -- glass thickness, Low-E coatings, gas fill, and spacer type.
We carefully remove the failed insulated glass unit from your existing window frame without disturbing the sash, trim, or interior finishes.
The new factory-sealed insulated glass unit is set into your frame with proper glazing points and high-performance sealant.
We verify proper fit, seal integrity, and clean operation of the window. You inspect the work and we address any questions.
The Expert Advantage
We specialize in insulated glass -- it is the core of our business, not a side service. Our technicians handle IGU replacements every day and understand the nuances of seal systems, gas fills, coatings, and spacer technologies that make the difference between an IGU that lasts five years and one that lasts twenty-five.
We source our insulated glass units from established fabricators who use dual-seal construction with warm-edge spacer technology. Every unit is factory-sealed under controlled conditions to ensure consistent quality and longevity.
Glass-Only
Replacement -- no frame needed
All Brands
Andersen, Pella, Marvin & more
Dual-Seal
PIB + silicone construction
Same Day
Measurements & quotes available
Licensed
Fully Insured
Warranty
Workmanship guaranteed
Who We Serve
We replace failed insulated glass in single-family homes, townhouses, condos, and historic residences throughout the DMV. Most homes need only IGU replacement, not full window replacement -- saving significant cost while restoring full thermal performance.
Commercial buildings with failed insulated glass lose energy and present a poor image to clients and tenants. We replace IGUs in offices, retail spaces, restaurants, and institutional buildings with minimal disruption to business operations.
FAQ
Common questions about insulated glass units, seal failure, and IGU replacement in the Washington DC, Virginia, and Maryland area.
Understand the causes of foggy windows -- failed seals, condensation, and moisture infiltration in insulated glass units.
Prepare your insulated glass windows for harsh DC-area winters with inspection tips, weatherstripping, and IGU upgrades.
A practical guide to deciding whether your insulated glass needs a seal repair or a full unit replacement.
Service Areas
Professional insulated glass unit replacement for homes and businesses throughout Washington DC, Northern Virginia, and Maryland.
Insulated glass services for Georgetown, Capitol Hill, Dupont Circle, Adams Morgan, Foggy Bottom, and neighborhoods throughout the District. DC's historic rowhouses and older condo buildings often have outdated single-pane or failed double-pane windows. We fabricate custom IGUs to fit historic profiles while adding modern energy performance and thermal comfort.
IGU replacement throughout Arlington, Alexandria, Fairfax, Tysons, Reston, McLean, and across Northern Virginia. The region's hot, humid summers and cold winters put heavy thermal stress on window seals. We replace failed units with Low-E, argon-filled IGUs that cut energy costs and eliminate foggy window problems year-round.
Serving Bethesda, Silver Spring, Rockville, Columbia, Chevy Chase, and communities throughout Maryland with foggy window repair and IGU upgrades. Many Maryland homes built in the 1990s and 2000s now have failing seals. We replace the glass units without disturbing the frames, restoring clarity and energy efficiency at a fraction of full window replacement cost.
Explore More
Need more than IGU replacement? Explore our full range of glass services for homes and businesses.
Dedicated foggy and cloudy window repair. Fix condensation between panes caused by seal failure.
Learn MoreLow-E coatings, argon fill, and thermal glass upgrades to reduce heating and cooling costs.
Learn MoreFull window replacement for frames that are damaged, rotted, or ready for a complete upgrade.
Learn MoreCustom glass cutting, tempering, and IGU fabrication to exact specifications for any application.
Learn MoreLaminated and specialized glass for maximum noise reduction in homes near busy roads or airports.
Learn MoreSkylight glass replacement and seal repair. Fix leaking, fogged, or broken skylights.
Learn MoreCommercial storefront glass repair, replacement, and upgrades for retail and office spaces.
Learn MoreSliding glass door repair and replacement, including track repair, rollers, and glass panels.
Learn MoreStop losing energy and living with foggy views. New insulated glass units restore clarity, comfort, and efficiency -- and we make it easy with free estimates, expert installation, and a workmanship warranty on every job.
Licensed & Insured -- Fully Insured -- Serving DC, Virginia & Maryland