In bathroom renovations, safety is as important as style. That’s why many upgrades are subject to construction codes, like tempered glass requirements.
Bathrooms often require tempered glass in windows, shower doors and other areas for safety reasons. Tempered glass is stronger and less breakable than standard glass, making it valuable in bathing spaces where harmful shards could cause injury. This guide will help you understand tempered glass rules for your home to ensure every window is up to code.
What Is Tempered Glass?
Tempered glass is a type of safety glass that is heat-treated to be up to five times stronger than standard (annealed) glass. It’s resistant to breakage, but if it is ever damaged, it will also shatter into small, rounded, pebble-like pieces that are much less dangerous underfoot.
Besides these added safety benefits, tempered glass offers other advantages for bathing spaces:
- Increased durability: Tempered glass can withstand impacts, temperature changes and daily wear and tear in humid bathrooms.
- Weather resistance: The glass’s strength makes it resilient to hail, high winds and flying debris. This is a great perk in bathrooms (or any room) exposed to severe weather risks.
- Low maintenance: Tempered glass is smooth, non-porous and as easy to clean and maintain as other glass.
| Tempered Glass vs. Standard Glass | ||
| Standard Glass | Tempered Glass | |
| Durability | Susceptible to shattering, breakage from temperature fluctuations and other risks | Up to five times more durable than standard glass. Less risk of damage from wear and tear or nature. |
| Breaking Patterns | Breaks into sharp shards | Breaks into small, rounded, less dangerous pieces |
| Injury Risks | Higher injury risk ❌ | Lower injury risk ✅ |
| Code Requirements | Not required in wet areas | Required in hazardous locations |
How Is Tempered Glass Made?
The tempered glass manufacturing process strengthens the glass through intense heat and rapid cooling. First, the glass is inspected for impurities. Then, it is heated to around 1,100° F in a special oven. Afterward, it is rapidly cooled using high-pressure air.
During the tempering, the outer layer of the glass compresses, placing the inner layer under great tension. This added tension makes the glass harder to break, creating a stronger, safer panel.
Why Bathroom Windows Must Be Tempered
Bathroom window glass usually must be tempered to comply with local building codes. Forty-nine states, the District of Columbia and various U.S. territories have adopted standards set by the International Residential Code (IRC), requiring safety glazing—which tempered glass is—in “hazardous locations” in homes. Hazardous spaces usually include bathrooms with tubs, showers, saunas and hot tubs, where fall and injury risks are higher.
Code Requirements for Bathroom Windows
Although IRC regulations are adaptable and can vary by location, they generally contain the following bathroom window code requirements.
- Vertical rule: Any window or glazing with a bottom exposed edge less than 60 vertical inches above any standing or walking surface must be tempered. This applies to windows in the tub or shower area.
- Horizontal rule (Arc rule): Any window within a 60-inch horizontal arc from the water’s edge of a tub, shower or hot tub is considered a hazardous location and must be tempered.
- Important exception: Glazing more than 60 inches horizontally from the water’s edge of a tub or shower generally doesn’t need to be tempered.
Alongside windows, tempered glass is typically required for:
- Shower doors and enclosures
- Glass panels near tubs
- Bathroom mirrors above a certain size
- Skylights
Glass behind or above toilets may also need to be tempered.
What Happens if You Don’t Use Tempered Glass?
If you don’t include tempered glass in your bathroom, you risk violating building codes and causing various problems, including:
- Failed inspections
- Insurance liability risks
- Greater injury hazards
- Reduced home resale value
If you’re unsure about needing tempered glass, it’s alright to err on the side of caution and install it throughout your bathing space.
Do I Need Tempered Glass Throughout My House?
Tempered glass may not be required throughout your home, but it will be necessary in areas deemed “hazardous” by building codes. Hazardous areas often include:
- Kitchens
- The areas around doorways (like sidelites)
- Stairways
- Places with low-to-the-ground glass, like floor-to-ceiling windows or sliding patio doors
If you’re worried about tempered glass requirements affecting your home upgrades, don’t be. Window World’s products are engineered to be durable and code-compliant, and we can include tempered glass options where appropriate to ensure your upgrades follow the rules.
When Should You Replace a Bathroom Window?
If you begin noticing problems with your existing windows, it’s time to replace them with new, reliable tempered-glass models. Look out for these danger signs:
- Cracked or chipped glass
- Drafts or moisture between panes
- Fogging
- Damaged seals
Impurities like these can weaken your window’s structural integrity, cause energy waste, and increase breakage and injury risks. Replacing older windows with newer, energy-efficient models can keep your space code-compliant, reduce utility bills and improve interior comfort.
Additionally, if you’re planning a bathroom remodel, you may need to replace an outdated, non-tempered window with tempered glass for the space to pass final inspection. Check with your contractor about the specifics.
Trust Window World for Tempered Bathroom Windows
Tempered windows can keep you relaxed and comfortable in all your living spaces. Window World’s windows are the best for safety, energy efficiency and customization. Plus, they can give your space a wonderful new look and feel. Get your free window estimate today.
Frequently Asked Questions
Do bathroom windows legally require tempered glass?
Yes, bathroom windows usually require tempered glass. U.S. building codes frequently require this solution because it makes glass stronger and less likely to break. Moreover, if tempered glass shatters, it will break into tiny, pebble-like pieces that are less dangerous than shards of non-tempered glass. This is important in bathrooms, where you’re more susceptible to injury risks from broken glass.
Are shower windows always tempered?
Technically, shower windows may not always need tempered glass, depending on code requirements in your area. However, tempering is highly recommended.
Tempered glass is safer and less prone to breakage than non-tempered glass. This can help you avoid stepping on shards of shattered shower door glass in your bare feet.
Does replacing a bathroom window increase home value?
Upgrading your bathroom windows to tempered glass can protect or improve your home value. Code-compliant glass windows boost buyer confidence, while bathroom upgrades have a high ROI in general. Buyers appreciate new windows’ perks, such as inspection compliance and energy efficiency.