Not all glass damage requires full replacement. This decision framework helps you determine whether repair, partial replacement (IGU only), or full replacement is the most cost-effective solution for ten common glass damage scenarios -- with specific cost comparisons for each.
Last Updated: March 2026
Ten common glass damage scenarios with our recommended approach, reasoning, and approximate cost comparison. Use this framework to make an informed decision before calling for service.
| Scenario | Recommendation | Reason |
|---|---|---|
| Small chip in window glass (< 1" diameter) | Repair | Resin fill restores appearance at low cost |
| Surface scratch on non-tempered glass | Repair | Cerium oxide polishing removes most scratches |
| Crack in any tempered glass panel | Replace | Tempered glass cannot be repaired; will shatter |
| Foggy double-pane window (seal failure) | Replace IGU | IGU replacement restores full thermal performance |
| Crack extending to glass edge | Replace | Edge cracks cannot be reliably repaired and will spread |
| Cracked glass in safety location | Replace immediately | Safety code requires intact safety glazing |
| Single-pane window in old frame | Full replacement | Upgrade to IGU provides energy savings that justify cost |
| Scratched shower door glass | Replace | Tempered glass cannot be polished without compromising tempering |
| Decorative/heritage glass damage | Repair if possible | Specialty glass is expensive and hard to match |
| Commercial storefront crack | Replace | Safety and liability risk; usually tempered glass |
Small chips in non-tempered glass (annealed or float glass) can be filled with UV-cure acrylic resin. The resin has a refractive index close to glass (1.49 vs 1.52), making the repair nearly invisible. Best results are achieved on chips smaller than a quarter that have not been contaminated with dirt or moisture. The repair takes 20-30 minutes per chip and restores approximately 80-95% of the optical clarity in the damaged area. Chip repair is not a structural repair -- it prevents the chip from becoming a crack and improves appearance.
Best for: Windows, mirrors, non-tempered table glass, automotive windshields (different process).
Surface scratches in annealed glass can be polished out using cerium oxide compound and a felt polishing wheel. The compound gently removes a microscopic layer of glass until the scratch is no longer visible. This process works on scratches that you cannot feel with your fingernail (typically less than 0.1mm deep). Deeper scratches require more aggressive polishing that can create optical distortion. Tempered glass should never be polished because removing material from the compression layer compromises the tempering and can cause spontaneous breakage.
Best for: Window glass, mirrors, glass tabletops, display glass. Never for tempered or laminated glass.
Tempered glass has internal stress that makes any crack or deep chip unstable. The entire panel must be replaced -- there is no reliable repair method for tempered glass.
Edge cracks will continue to propagate across the glass due to stress concentration at the crack tip. Temperature changes and vibration accelerate crack growth. Repair is temporary at best.
Once the sealed unit is breached, the insulating gas escapes and moisture enters. IGU replacement restores full thermal and optical performance. Defogging is a temporary measure.
Damaged glass in code-mandated safety locations (showers, near doors, low windows) must be replaced immediately with properly rated safety glass -- repair does not restore safety compliance.
Glass used in railings, floors, canopies, or load-bearing panels must be replaced if damaged. These applications have no margin for reduced strength from damage.
When damage involves multiple cracks, large cracks (over 6 inches), or branching crack patterns (spider web), repair is not practical and replacement is the only option.
How long different types of replacement glass take from measurement to installation.
| Glass Type | Fabrication Time | Installation Time | Notes |
|---|---|---|---|
| Standard tempered (stock sizes) | 1-3 business days | 30-60 min | Common sizes often in stock locally |
| Custom-size tempered | 3-7 business days | 30-60 min | Cut and tempered to exact specifications |
| Insulated glass unit (IGU) | 5-10 business days | 30-90 min | Fabricated with specific glass, coatings, and gas fill |
| Laminated glass | 7-14 business days | 30-90 min | Autoclave bonding process adds time |
| Specialty (tinted, Low-E, decorative) | 10-15 business days | 30-90 min | Special coatings and materials may have longer lead times |
| Custom shapes (arched, round) | 2-4 weeks | 1-2 hours | Template creation adds time; complex installation |
Small cracks in non-safety glass can sometimes be repaired using resin injection, which fills the crack with a clear optical adhesive that bonds the glass and reduces visibility of the crack. Resin repair works best on cracks less than 6 inches long, stress cracks that have not spread, and surface chips smaller than a quarter. However, repair is not recommended for tempered glass (which shatters completely if compromised), laminated glass where the interlayer is damaged, cracks that extend to the glass edge, or any safety-glazing location. In most cases, replacement provides better long-term value because repairs are cosmetic and do not restore structural integrity.
Defogging (drilling, cleaning, and resealing) costs approximately 50-70% less than IGU replacement for a typical residential window. However, defogging does not restore the argon gas fill or repair the original seal, meaning thermal performance remains degraded and the fog may return within 3-5 years. IGU replacement installs a completely new insulated glass unit with fresh seals and gas fill, restoring full thermal performance for 15-25 years. For windows less than 10 years old with warranty coverage, IGU replacement is typically covered. For older windows where the frames are also aging, full window replacement may be the most cost-effective long-term solution.
Glass repair is appropriate when: the damage is a small chip or scratch (not a crack), the glass is not in a safety-glazing location, the glass is expensive specialty glass (such as decorative or heritage glass), the damage is cosmetic only and does not affect structural integrity, and the cost of repair is significantly less than replacement. Surface scratches in non-tempered glass can be polished out using cerium oxide. Small chips can be filled with UV-cure resin. These repairs are cosmetic improvements that reduce the visibility of the damage but do not restore the glass to original condition.
Most homeowner insurance policies cover glass breakage caused by covered perils (storms, vandalism, accidental breakage) minus your deductible. If the cost of replacement is less than your deductible, filing a claim is not recommended as it may affect your premium. Some policies offer optional glass breakage riders that cover glass replacement with no deductible. Commercial property insurance typically covers glass under the building coverage portion. Auto glass replacement is covered under the comprehensive portion of auto insurance, often with no deductible in states that mandate it. Document the damage with photos before any repair or cleanup.
Tempered glass either appears intact or shatters completely into small granular pieces -- there is no middle ground. You cannot repair tempered glass. If tempered glass has any crack or chip, the compression stress layer has been compromised, and the entire panel will eventually shatter, potentially without warning. Signs of stressed but not yet shattered tempered glass include: small spots or pits where the coating appears different, very faint marks that could be developing stress fractures, and areas where the glass appears slightly wavy when viewed at an angle. If you suspect any damage to tempered glass, have it inspected by a professional immediately -- do not wait for it to shatter.
The following types of glass damage require immediate replacement for safety: any crack in tempered glass (it will eventually shatter completely), cracks in laminated glass where the interlayer is visibly damaged or separated, cracks in safety-glazing locations (shower doors, sidelights, low windows), broken seals with visible structural deflection of the glass, any glass with sharp exposed edges in accessible areas, and cracked glass in structural applications (railings, floors, load-bearing panels). Even when glass damage appears stable, safety-critical glass should never be left in a damaged condition -- temporary covering with safety film or board-up is appropriate until replacement glass is available.
Glass repair (scratch polishing or chip filling) typically takes 30-60 minutes per panel for a trained technician. Results are immediate. Glass replacement timelines vary significantly: standard-size tempered glass panels are usually available within 1-3 business days. Custom-size IGUs require 5-10 business days for fabrication. Specialty glass (tinted, Low-E, laminated, decorative) may require 10-15 business days. Custom shapes (arched, round, irregular) can take 2-4 weeks. Emergency board-up service provides same-day security while replacement glass is being fabricated. The installation itself takes 30-90 minutes per panel for most residential and standard commercial glass.
Our glass specialists assess the damage, recommend the most cost-effective solution, and provide honest advice on whether repair or replacement is the right choice. Free inspections and estimates throughout the DMV area, backed by our Comprehensive Warranty.
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