Cloudy, hazy, foggy windows are not just ugly -- they are costing you money every month in wasted energy. We fix the problem at a fraction of the cost of full window replacement.
When the seal fails on your double-pane or triple-pane windows, moisture gets trapped between the glass. We replace just the insulated glass unit -- not the entire window -- saving you 50-70% while restoring crystal-clear views and full energy efficiency.
50-70%
Cost Savings
20+
Years Exp
4.9
Star Rating
Fully
Insured
Video Overview
See how we diagnose failed window seals, replace insulated glass units, and restore crystal-clear views and energy efficiency.
The Problem
Foggy windows are not a cosmetic issue you can ignore. They signal a structural failure in your insulated glass unit that gets worse over time and costs you money every month.
The hermetic seal around the edge of your double-pane glass has broken down. This seal was designed to keep moisture and air out of the space between the panes. Once it fails, there is no way for the unit to self-repair. The fog will only get worse as more moisture infiltrates the compromised seal.
Failed seals mean the argon gas fill has escaped and been replaced by humid air. Your windows are now insulating 20-30 percent worse than they should be. You are paying more for heating in winter and cooling in summer while the failed glass transfers heat in both directions.
Trapped moisture between the panes etches the interior glass surfaces over time, creating permanent mineral deposits and staining. If left long enough, the glass becomes permanently clouded even after the moisture is removed. Early repair prevents irreversible glass damage.
Foggy windows obstruct your views, reduce natural light entering your home, and make rooms feel dark and dingy. The haze is especially noticeable during temperature swings and on humid days when condensation is heaviest between the panes.
Foggy windows are one of the first things buyers, neighbors, and visitors notice. They signal deferred maintenance and reduce your home's curb appeal and market value. In the competitive DMV real estate market, foggy windows can be a dealbreaker during home showings.
Seal failure does not stop or reverse itself. The fog gets worse over time as more moisture enters the unit. Mineral deposits accumulate on the glass surfaces. Eventually, the glass may need to be replaced even if the IGU could have been repaired earlier. Acting sooner saves money.
Failed seals do not fix themselves. The fog gets worse, the energy loss compounds, and the glass damage becomes permanent. Get a free estimate today and stop paying for air conditioning and heating that escapes through compromised glass.
Our Solutions
From single foggy windows to whole-house IGU replacement, we have the solution that restores your views, your energy efficiency, and your home's curb appeal.
We remove the failed IGU from your existing window frame and install a new factory-sealed double-pane or triple-pane unit with Low-E coatings, argon gas.
For windows with early-stage seal failure where moisture ingress is minimal, we can defog the unit by drilling micro-holes, evacuating moisture, and.
Failed insulated glass in skylights, sliding patio doors, French doors, and oversized windows.
Replace clear glass IGUs with high-performance Low-E, solar control, or triple-pane units.
Foggy glass replacement for historic homes in the DMV that require preservation-compliant materials.
Multi-unit foggy glass replacement for office buildings, condominiums, and commercial properties.
Our Process
Our streamlined process gets your windows clear again with minimal disruption. Most repairs are completed in a single visit once the replacement glass is fabricated.
We inspect your foggy windows, confirm seal failure, measure the glass unit dimensions, assess frame condition,
We order your replacement IGU with the specified Low-E coating, gas fill, and spacer system. Standard sizes are often in stock.
We carefully remove the failed glass unit from your window frame, clean the frame channel, install the new factory-sealed IGU,
We verify the seal, check the glass for defects, confirm proper drainage weep holes are clear, clean all surfaces,
Why Choose Us
We inspect your foggy windows and provide a diagnosis and estimate the same day you call.
We replace just the glass, not the entire window. This saves you 50-70 percent compared to full window replacement while delivering the same clear,
Virginia licensed contractor (), fully insured, and bonded. Every foggy window repair meets Virginia, Maryland, and DC building codes.
Over two decades repairing foggy windows across the DMV. We have replaced thousands of failed IGUs in every window type, brand, and style.
Warning Signs
Not sure if your windows need repair? Here are the telltale signs of seal failure that indicate your insulated glass unit needs replacement.
The most obvious sign. You see condensation, haze, or cloudiness between the glass panes that does not respond to cleaning from either side. This is moisture trapped inside the sealed unit because the perimeter seal has failed. No amount of cleaning will remove it because the fog is between the panes, not on the surface.
The fog may appear heavier on humid days and lighter on dry days. It may be worse in the morning and better in the afternoon. This fluctuation is caused by temperature and humidity changes that affect the moisture trapped between the panes. The seal has failed even if the fog is not visible every day.
In advanced cases, you can see actual water droplets running down the interior surface of the glass between the panes. This indicates significant moisture ingress and means the seal failure is severe. The longer water sits on the glass, the more likely it is to cause permanent mineral etching.
Over time, minerals dissolved in the trapped moisture deposit on the glass surface as the water evaporates and recondenses. These white, chalky deposits are permanent and cannot be cleaned because they are between the panes. If you see mineral staining, the seal has been failed for a significant period.
Moisture between the panes can cause visual distortion when looking through the window. The view appears wavy, rippled, or unclear. This happens because the moisture and mineral deposits scatter and refract light passing through the glass differently than clean, dry glass does.
In the DMV, foggy windows often look worst during spring and fall when temperature swings are greatest. The temperature differential between indoor and outdoor air causes maximum condensation. Winter can also be bad when warm, humid indoor air meets the cold outer pane through the failed seal gap.
Local Expertise
The Washington DC metropolitan area has one of the most challenging climates for insulated glass units in the eastern United States. Here is why your windows are failing.
The DMV experiences summer highs above 95 degrees and winter lows below 20 degrees. This 75-plus degree annual temperature range causes constant expansion and contraction of the glass, spacer, and sealant materials. Each cycle stresses the seal a little more. Over 15-25 years, thousands of these cycles break down even the highest quality seals.
DMV summers are notoriously humid. When a seal has even a microscopic failure, the high outdoor humidity drives moisture into the unit through the breach. The desiccant inside the spacer absorbs moisture at first, but once saturated, the moisture has nowhere to go except onto the glass surfaces where it condenses and creates the visible fog.
The DMV experiences dozens of freeze-thaw cycles each winter. Water that has entered a weakened seal expands when it freezes, physically widening the breach. When it thaws, more moisture enters the now-larger gap. This progressive cycle accelerates seal failure once it begins, which is why foggy windows seem to get dramatically worse once they start.
The sealant around your insulated glass unit degrades under ultraviolet radiation. South-facing and west-facing windows receive the most UV exposure and their seals fail first. Many DMV homeowners notice that their south-facing windows fog up years before their north-facing windows. UV-accelerated degradation is the primary seal failure mechanism for windows under 20 years old.
Glass Technology
Your replacement insulated glass unit will use significantly better technology than the original. Here is what goes into the new glass we install.
Emissivity 0.04-0.15
Microscopic metallic coatings that reflect infrared heat while allowing visible light through. In winter, Low-E keeps your heat inside. In summer, it blocks solar heat gain. Modern Low-E coatings are dramatically better than those available 15-20 years ago when your original glass was made.
95% Fill Minimum
The space between the panes is filled with argon gas, which is denser than air and significantly reduces heat transfer. Argon improves the U-factor by approximately 30 percent compared to air-filled units. Your original unit likely lost its argon fill long before the seal visibly failed.
Structural Foam or Stainless
Modern spacer systems use low-conductivity materials like structural foam or thin-wall stainless steel instead of the aluminum spacers used in older IGUs. This reduces heat transfer at the edge of the glass, eliminates the cold spots that cause condensation on the frame, and reduces thermal stress on the seal.
PIB Primary + Silicone Secondary
Modern IGUs use a dual-seal system: a polyisobutylene (PIB) primary seal that blocks moisture penetration and a structural silicone or polysulfide secondary seal that provides structural integrity. This redundant design lasts significantly longer than the single-seal systems used in many older units.
Molecular Sieve
Advanced molecular sieve desiccant is loaded into the spacer to absorb any residual moisture in the sealed unit. Modern desiccants have higher absorption capacity and longer service life than older formulations, providing an additional moisture defense even if the primary seal eventually degrades.
Tempered or Laminated
Replacement IGUs can be fabricated with tempered or laminated glass where required by building code or desired for safety. Tempered glass is four times stronger than annealed glass and breaks into small, relatively safe pieces. Laminated glass holds together when broken, providing additional security.
Smart Choice
Window companies want to sell you entire new windows. In most cases, you only need the glass replaced. Here is how the two approaches compare.
All Window Types
We replace failed insulated glass units in every window type installed in DMV homes. No matter your window style, we can fix the fog.
The most common window in DMV homes. Both sashes contain IGUs that can fail independently. We replace one or both glass panels while preserving the frame, balances, and hardware.
Crank-operated windows with a single large IGU per sash. The IGU is glazed into the sash with either a removable stop or structural sealant. We handle both styles and preserve the operating hardware.
Large fixed windows with oversized IGUs. These are the most visible foggy windows and the most impactful to repair. We fabricate replacement IGUs in any size up to 96 by 60 inches.
Horizontal sliding windows with IGUs in each sliding and fixed panel. We remove the operable sash for easy glass access and replace the IGU without disturbing the track or frame.
Multi-panel window assemblies with IGUs at multiple angles. We replace individual foggy panels without replacing the entire bay or bow structure, saving significant cost and disruption.
Sliding and French patio doors use large insulated glass panels. We replace the foggy IGU in the door panel while preserving the frame, rollers, track, and locking hardware.
The narrow glass panels flanking entry doors and the horizontal panels above them. These are frequently foggy because they face south and receive heavy UV exposure. We match the glass type to your existing door glass.
Roof-mounted skylights with failed seals. We replace the skylight IGU and reseal the unit against the flashing and waterproofing system. Skylights require careful handling to maintain the weather seal.
Energy Impact
Foggy windows are not just an eyesore. When the seal fails and argon gas escapes, your windows lose a significant portion of their insulating capacity. Here is what that means for your energy bills.
The argon gas between your window panes is what provides the insulating barrier. When the seal fails, argon slowly escapes and is replaced by regular air. Argon provides approximately 30% better insulation than air. Your foggy windows have already lost most or all of their argon, which means they are conducting significantly more heat than they were designed to.
The moisture that enters through a failed seal deposits minerals on the Low-E coating surface over time. These mineral deposits reduce the coating effectiveness, allowing more heat to transfer through the glass. Even if you cannot see visible mineral deposits yet, the humidity alone degrades coating performance. Replacement glass restores full Low-E function.
Every foggy window is a thermal weakness in your home envelope. Your HVAC system works harder to compensate for the heat loss in winter and heat gain in summer. In a home with five or more foggy windows, the energy impact is measurable on your monthly utility bills. Replacing the failed IGUs restores the designed thermal performance of every window.
Seal failure is progressive. Once one window fogs, the rest typically follow within a few years because they all experienced the same environmental exposure. Homeowners who wait often end up with ten or fifteen foggy windows instead of the original two or three. The energy cost compounds as each additional window loses its insulating performance.
Our Commitment
We verify that your window actually has a failed seal before recommending replacement. If the fog is surface condensation or can be resolved with a simpler fix, we will tell you and save you money.
We measure your existing glass unit down to the millimeter. The replacement IGU is fabricated to match your exact opening dimensions, glass thickness, and spacer width so it fits precisely into your existing frame.
Your replacement IGU will use significantly better technology than the original -- modern Low-E coatings, argon gas fill, warm-edge spacers, and dual-seal systems that were not available when your original glass was made.
We protect your window sills, floors, and furniture. We remove the old glass, install the new IGU, clean the frame, and leave your home spotless. No mess, no debris, no glass fragments left behind.
In the competitive DMV real estate market, foggy windows are a red flag that buyers notice immediately. They signal deferred maintenance and give buyers negotiating leverage. Fixing foggy windows before listing costs a fraction of the price reduction buyers will demand. It is one of the highest-ROI pre-listing investments you can make.
Before You Call
Here are the most common things homeowners want to know before scheduling their foggy window repair. We want you to feel confident and informed before we even arrive.
Yes, someone needs to be home during the initial measurement visit and during installation. The measurement visit takes about 15-30 minutes per window. Installation typically takes 30-60 minutes per window depending on the window type and accessibility.
No. We remove the old glass from your existing frame using professional techniques that protect the frame. We then install the new IGU into the same frame with fresh glazing. Your frames, hardware, and trim remain untouched and undamaged.
We can replace multiple windows in a single visit. For large projects with 10 or more windows, we typically complete the work over two days to ensure quality and allow for proper cleanup. Most projects of 1-8 windows are completed in a single day.
We recommend fixing all foggy windows at once for the best value. Fabrication and delivery costs are spread across more units, and you only need us at your home once. However, we are happy to prioritize the most visible windows if your budget requires phasing the project.
During the measurement visit, we inspect your frames for rot, warping, or damage. If the frames are compromised, we will tell you honestly and recommend full window replacement for those specific windows. We never install new glass into a frame that will not support it properly.
The fog is gone the moment we install the new glass. There is no waiting period, no gradual clearing, no break-in time. The new IGU is factory-sealed with dry air or argon gas inside. You will have crystal-clear windows from the moment we finish the installation.
Client Reviews
“We had seven foggy windows in our colonial. A window company quoted us for full replacement at an outrageous price. Expert Glass replaced just the glass units for a fraction of the cost. Every window is crystal clear now. I wish we had called them first and saved ourselves weeks of stress.”
Michelle S.
Arlington, VA
“Our twenty-year-old double-pane windows started fogging up one by one. Expert Glass measured all of them, fabricated the replacement IGUs, and installed them over two days. The new Low-E glass actually insulates better than the original. Excellent value and outstanding craftsmanship.”
Robert K.
Bethesda, MD
“We needed foggy window repair in our historic Georgetown row house. Expert Glass found IGU replacements that matched the thin profile required by the historic preservation board. They handled everything including the approval process. Our windows look original but perform like modern glass.”
Patricia L.
Georgetown, DC
Clear windows are not a luxury -- they are a sign of a well-maintained home. We replace the glass, not the window, and restore your views in a single visit. Call today for your free, no-obligation estimate.
Window Brands
No matter who manufactured your windows, we fabricate replacement insulated glass units that fit your frames perfectly. We work with every brand installed in DMV homes.
Replacement IGUs for Andersen 200 Series, 400 Series, and A-Series windows. We match the specific glass specifications and glazing bead profile for each Andersen product line.
Foggy glass replacement for Pella Architect, Lifestyle, and Impervia series. We handle the proprietary glazing systems used in Pella window sashes.
IGU replacement for Marvin Essential, Elevate, and Signature series. We match the specific Low-E coatings and glass configurations Marvin specifies for each product.
Replacement glass for Milgard Tuscany, Trinsic, Ultra, and StyleLine series. We source IGUs that match the exact dimensions and performance specifications of the original Milgard units.
Foggy glass repair for Simonton vinyl windows including the 5500 and Reflections series. We match the specific glazing pocket dimensions and IGU thickness Simonton uses.
IGU replacement for Jeld-Wen wood, vinyl, and aluminum-clad windows. We handle the full range of Jeld-Wen product lines installed in DMV homes.
Replacement glass for Renewal by Andersen Fibrex and wood interior windows. We fabricate IGUs that meet the specific performance requirements of Renewal windows.
We also repair foggy glass in windows by Kolbe, Weather Shield, Lincoln, Loewen, Sierra Pacific, Quaker, Amsco, and every other brand installed in DMV homes. If it has glass, we fix it.
Service Areas
We repair foggy windows across the entire Washington DC metropolitan area. Same-day diagnosis available for most locations. If your windows are foggy, we can fix them.
Arlington, McLean, Great Falls, Fairfax, Reston, Herndon, Leesburg, Ashburn, Vienna, Oakton, Falls Church, Tysons, Alexandria, Centreville, Chantilly, Springfield, Lorton, Woodbridge, Manassas, Sterling
Northern Virginia homes from the 1980s-2000s are in the prime window for IGU seal failure. We repair foggy windows in Arlington townhouses, McLean colonials, Reston contemporary homes, and every neighborhood in between.
Bethesda, Chevy Chase, Potomac, Rockville, Silver Spring, Columbia, Bowie, College Park, Gaithersburg, Olney, Laurel, Germantown, Kensington, Takoma Park, North Bethesda, Wheaton, Hyattsville, Greenbelt
Maryland foggy window repairs from Bethesda to Columbia. Montgomery County and Prince George's County homes with 15-25 year old windows are our most common repair calls.
Georgetown, Foxhall, Spring Valley, Cleveland Park, Woodley Park, Kalorama, Capitol Hill, Palisades, Forest Hills, Dupont Circle, Logan Circle, Adams Morgan, Brookland, Petworth, Takoma, all DC quadrants
DC foggy window repair for row houses, townhomes, historic homes, and condominiums. We source preservation-compliant replacement glass for historic district properties.
Common Questions
Understand the science behind foggy windows, failed seals, and moisture trapped between insulated glass panes.
A breakdown of foggy window repair costs in the DMV, including IGU replacement vs full window replacement pricing.
How to tell whether your window fog is a failed seal requiring repair or normal condensation you can fix yourself.
Ready to See Clearly Again?
Call us today or request a free estimate online. We will inspect your foggy windows, confirm the seal failure, measure for replacement glass, and provide a detailed quote. Most repairs cost 50-70% less than full window replacement. No obligation, no pressure.
Complete insulated glass unit repair and replacement for double-pane and triple-pane windows across the DMV.
Learn MoreFull window replacement when frames are damaged. Energy-efficient windows for homes and commercial buildings.
Learn MoreEmergency broken window repair with same-day board-up and glass replacement services.
Learn MoreGuide to energy-efficient glass options, Low-E coatings, and argon gas fill for DMV homes.
Learn More