Resealing double pane windows costs about $3-$8 per linear foot for exterior caulking, while fixing a failed seal between the panes usually means replacing the insulated glass unit for $150-$450 per window. The final price depends on whether the problem is surface caulk or a broken factory seal, plus window size, glass type, access, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Exterior caulk repair | $75 | $200 | $500 | Per window; accessible frame and limited prep |
| Insulated glass unit replacement | $150 | $300 | $450 | Per standard-size window; glass only |
| Sash or full window replacement | $300 | $750 | $1,500+ | Per opening; scope and frame condition vary |
What homeowners pay to reseal a double pane window
For a typical 3-by-5-foot double pane window, exterior caulking costs $75-$250 when a contractor removes loose sealant and applies new weatherproof caulk. That work seals the frame-to-wall or glass-to-frame joint; it does not repair a failed seal between the panes.
If moisture or fog is trapped inside the glass, replacing the insulated glass unit (IGU) generally costs $150-$450 per standard window, including installation. Oversized, tempered, low-E, or custom-shaped glass can cost $500-$1,000 or more. Assumptions: standard residential window, ordinary access, and midrange U.S. labor rates. The key pricing distinction is whether the leak is at the exterior joint or inside the sealed glass unit.
How glass, labor, and disposal shape the quote
A glass-only repair quote usually covers measuring, ordering, removing the old unit, fitting replacement glass, and cleanup. Labor commonly runs $75-$150 per hour, though many companies charge a minimum service fee of $100-$200 for a small job.
| Quote item | Typical price | Pricing basis | Usually includes |
|---|---|---|---|
| Standard IGU | $80-$250 | Per unit | Basic clear or low-E glass |
| Installation labor | $75-$150 | Per hour | Removal and fitting |
| Trip or minimum charge | $100-$200 | Per visit | Inspection and small-job minimum |
| Removal and disposal | $15-$50 | Per window | Old glass handling |
| Exterior caulk and prep | $3-$8 | Per linear foot | Sealant, scraping, and application |
Ask whether the estimate separates glass, labor, trip charges, and disposal so competing bids cover the same work.
Glass size, coatings, and access that raise prices
Size and glass specifications can change the price sharply. A unit under 10 square feet may fit a standard replacement range, while glass over 20 square feet can cost $400-$900 or more because it needs heavier glass and additional handling. A custom shape or grille pattern may require a specialty order.
Low-E coatings, argon-filled cavities, laminated glass, and tempered safety glass also affect replacement pricing. Tempered glass is commonly required near doors or in other code-defined locations. Second-story access, fragile trim, or a window that must be removed from the frame can add $50-$200 per opening. Confirm glass thickness, coating, safety rating, and dimensions before accepting a glass-only quote.
When a failed IGU needs replacement instead of resealing
Fog, mineral-like haze, or water droplets between panes usually indicate that the factory seal has failed. Applying caulk around the outside will not remove that moisture or restore the insulating gas inside the unit. Some firms offer defogging for roughly $75-$150 per window, but it typically treats appearance rather than restoring the original insulation performance.
Replacing the IGU is often practical when the sash and frame are sound. If the frame is rotted, warped, or difficult to service, a sash replacement at $250-$700 or a complete window at $500-$1,500 or more may be more appropriate. Compare repair and replacement only after the contractor checks the frame, sash, and source of moisture.
Three common double pane repair estimates
A small, ground-floor bathroom window with a failed standard IGU might cost $180-$300: about $100-$170 for glass, one to two labor hours, and a modest disposal fee. A larger 3-by-5-foot low-E unit may total $300-$550, depending on glass availability and installation time.
For an older window with sound glass but cracked exterior caulk, a 20-linear-foot perimeter repair might cost $100-$250, including scraping and resealing. If a second-story opening requires ladder setup or difficult trim removal, the estimate may rise to $350-$650 for glass replacement. These examples assume no major frame damage, lead-safe work, or custom fabrication.
Regional labor and scheduling differences
Prices in high-cost metro areas, including parts of the Northeast and West Coast, can run 15%-30% above a typical national quote. Rural areas may have lower hourly rates but higher trip charges, especially when a glass shop is far away or the job requires a special-order unit.
Routine repairs are usually less expensive when scheduled with other window work. Emergency service or a single small repair may trigger a $50-$150 rush or minimum charge. Seasonal demand can also extend lead times for custom glass, although the glass specification and local supplier availability matter more than the calendar. Compare at least two local written estimates and check whether travel or rush fees are included.
How to lower a window resealing bill
First, identify whether condensation is between panes or on an exposed surface. Interior room humidity can cause surface condensation, while water between panes points to an IGU problem. Correct diagnosis can prevent paying for exterior caulk that will not fix failed glass.
For several affected windows, request a combined visit and ask whether measuring, delivery, or setup charges can be shared. Keep the existing sash if it is in good condition, but avoid choosing a cheaper glass unit that omits required safety glass or the original low-E specification. Controlling the repair scope and matching the replacement glass to the existing unit are the most reliable ways to limit cost without sacrificing function.