Your basement bedroom window just cracked, or you’re about to cut a new opening for one, and now someone’s asking whether you need tempered glass or laminated glass. It’s not a small question. Pick wrong and you could fail a home inspection, fail a city permit inspection, or pay twice because the wrong glass has to come back out.
Here’s the short version: most egress windows in Lincoln use tempered glass because it’s the standard safety glazing that meets code and it’s the cheaper of the two. Laminated glass is an upgrade some homeowners choose for extra storm or security protection, and it costs more. Both satisfy the “tempered glass egress window” requirement in a general sense, since both count as safety glazing, but they behave very differently once something hits them.
We install and replace egress windows all over Lancaster, Seward, Saline, and Gage counties, and this question comes up on almost every basement bedroom job. Below is what the difference actually means for your window, your budget, and your home sale.
What’s the Difference Between Tempered and Laminated Glass?
Tempered glass is heat-treated so it’s about four times stronger than regular annealed glass. When it finally breaks, it shatters into small, dull-edged pebbles instead of long dangerous shards. That’s why it’s required in most window and door locations near the floor, including egress windows.
Laminated glass is two layers of glass bonded around a clear plastic interlayer, similar to a windshield. It can crack under impact, but the plastic layer holds the pieces together instead of letting them fall out. That makes it much harder to punch through, even after it’s broken.
Both types qualify as “safety glazing” under residential building code, which is the category egress windows fall into. The difference shows up in how each one performs during a storm, a break-in attempt, or a kid running into the glass with a bike.
If you’re not sure which one is already in your window, or whether your current basement window even qualifies as egress at all, our crew can take a look during a free estimate. Call (888) 217-8740 or reach out through our contact form and we’ll walk you through it before you spend a dollar.
Why Lincoln Code Requires Safety Glass Near Basement Bedrooms
Egress windows sit low, close to grade, and often right next to a window well with a metal or composite well liner. That’s a spot where regular glass is a real hazard if it breaks, whether from a fall, a lawn mower rock, or a hard freeze-thaw cycle cracking the well wall against the frame.
The International Residential Code (IRC), which Lincoln and Lancaster County use as the basis for local permitting, requires safety glazing in “hazardous locations,” and window openings near grade in a basement sleeping room fall into that category. You can read the underlying federal safety glazing standard directly from the Consumer Product Safety Commission at cpsc.gov, which is the standard most tempered and laminated glass products are certified against.
A tempered glass egress window meets that requirement in its most common, lowest-cost form. Laminated glass meets it too, and adds a layer of impact resistance tempered glass doesn’t have. Neither one is “wrong” from a code standpoint. The question is really about what extra protection you want to pay for.
If your home is in Lincoln proper, the city’s building permit process will check glazing type along with the size and sill height of the opening. We cover what inspectors actually check in our guide to IRC egress window code requirements, and how big the opening has to be under Nebraska’s adopted code.
Tempered Glass Egress Windows: Cost, Pros, and Cons
Tempered glass is the default for a reason. It’s widely stocked, it’s less expensive to manufacture, and every reputable window supplier in the region carries egress units with it standard. For most basement bedroom projects, it’s the right call.
Pros:
- Lower material cost, which keeps the whole job closer to the bottom of the price range
- Breaks into small, blunt pieces instead of sharp shards
- Meets IRC safety glazing requirements for hazardous locations
- Available in nearly every casement, slider, and inswing egress style we install
Cons:
- Once it breaks, it’s gone. There’s no plastic layer holding pieces in the frame, so you get an open hole until it’s replaced
- No extra resistance to forced entry or high wind debris
- Can spontaneously break years later from a manufacturing flaw called nickel sulfide inclusion, though this is rare
Take the Nissen family out in Waverly. Their 1980s home had a single-pane basement window with a fixed frame, no tempering, no egress compliance at all. We cut in a new opening, installed a vinyl casement egress window with tempered glass, and built a correctly sloped window well with drainage. Total project cost landed at $6,400, right in the middle of what a typical Lincoln-area cut-in install runs once you add the well and interior finishing.
For a straightforward basement bedroom that just needs to meet code, tempered glass gets the job done without inflating the budget. We break down the full range of what these jobs cost in our egress window cost breakdown.
Laminated Glass: Extra Storm and Break-In Protection
Laminated glass costs more, usually adding a few hundred dollars per window over a standard tempered unit, but some homeowners want that upgrade for specific reasons. Southeast Nebraska sees its share of severe spring storms, and a basement is often the safest room in the house during a tornado warning.
Because laminated glass holds together after impact, it’s a common choice for homeowners building or upgrading a basement space into a storm shelter or safe room. It also resists forced entry better than tempered glass, since an intruder has to cut or tear through the plastic interlayer even after cracking the outer pane, not just knock a hole through.
Denise Ortiz in Seward went this route when she finished her basement and wanted the new bedroom to double as a safe space during storm season. She upgraded from standard tempered glazing to laminated glass on her egress window, which added about $380 to her project total, bringing her full install to just under $5,900. She told us it was the cheapest upgrade on the whole job for the peace of mind it bought her family.
Laminated glass is worth asking about if you’re near a busy street where flying debris is a concern, if you’ve had break-in attempts in the neighborhood, or if severe weather protection matters to you. It’s not required by code, so it’s entirely a personal call. If you want a quote comparing both glass types side by side for your home, call (888) 217-8740 and we’ll price it both ways.
Tempered vs. Laminated Glass Egress Window Cost Comparison
| Factor | Tempered Glass | Laminated Glass |
|---|---|---|
| Typical added cost | Included in standard pricing | Adds roughly $250-$500 per window |
| Breaks into | Small, blunt pebbles | Cracks but stays bonded to plastic layer |
| Code compliance | Meets IRC safety glazing rules | Meets IRC safety glazing rules |
| Forced entry resistance | Standard | Higher |
| Storm/debris resistance | Standard | Higher |
| Post-break condition | Open hole until replaced | Often stays intact in the frame |
| Best fit | Standard basement bedroom, budget-conscious jobs | Storm safe rooms, security-focused homes |
For reference, a full new cut-in install with either glass type generally runs $3,500-$7,000 for the opening and window itself, with complete Lincoln-area projects (including a new window well and interior finishing) commonly landing between $5,500 and $9,500. Replacing glass in an existing opening runs $1,200-$3,000, and a window well replacement alone is $600-$1,500.
What Happens When an Inspector Flags Your Glass
This is where the glass question gets expensive if you ignore it. Home inspectors and city permit inspectors both check for safety glazing near grade, and a lot of older Lincoln homes still have plain annealed glass in basement window openings that were never upgraded when the house was built or remodeled.
Marcus Whitfield in Hickman found this out mid-sale. His home inspector flagged the basement bedroom window as non-compliant, both for missing egress dimensions and for glass that wasn’t tempered or laminated. The buyer’s agent wanted it resolved before closing. We came out, confirmed the opening itself was close to code but the glass wasn’t, and swapped in a properly sized tempered glass egress window unit for $2,100, finishing the job four days before closing.
That kind of last-minute scramble is common. We cover the warning signs buyers and sellers should watch for in our post on home inspection egress window red flags, and if you’re weighing whether to fix an aging window versus start over, that’s a repair-versus-replace decision worth getting a professional opinion on before you list.
If you’re selling a home with a basement bedroom, get the glass and the opening checked well before it goes on the market. A pre-listing inspection from a licensed contractor costs far less than a rushed closing-week repair. Reach out through our contact form or call (888) 217-8740 if you want that checked before you list.
Choosing the Right Glass for Your Lincoln Home
For most basement bedroom conversions, tempered glass is the practical choice. It’s code-compliant, it’s the standard everyone stocks, and it keeps your project inside the typical $5,500-$9,500 range for a full Lincoln installation. If you’re finishing a basement purely to meet code and add a legal bedroom, there’s rarely a reason to spend more.
Laminated glass makes sense when you have a specific reason to want it: a storm safe room, a security concern, or a busy street where flying debris is a real risk. It’s an upgrade, not a requirement, and it’s one of the more affordable ways to add real protection to a basement space.
Either way, the glass is only half the equation. The opening has to meet minimum size and sill height rules, and the well itself needs proper drainage so water isn’t sitting against your foundation and your window frame all spring. Cutting corners on any of those pieces is how homeowners end up with a window that looks fine but fails inspection.
We handle the whole job, from the cut-in and well installation to picking the right glass for your situation, for homeowners across Lincoln, Waverly, Hickman, Seward, Crete, Beatrice, and Ashland. If you’re not sure where to start, our egress window installation page walks through the process, and our egress window cost page has current pricing for every scenario.
Frequently Asked Questions
Is a tempered glass egress window required by code, or can I use regular glass?
Regular annealed glass isn’t allowed in egress window openings near grade. The IRC classifies these as hazardous locations, which requires safety glazing, either tempered or laminated. Regular glass will fail both a building permit inspection and most home inspections.
Does laminated glass cost a lot more than tempered glass for an egress window?
Not dramatically. Most homeowners see laminated glass add roughly $250-$500 per window compared to standard tempered glazing. On a full install running $5,500-$9,500, that’s a small percentage increase for meaningfully better impact resistance.
Can I tell whether my existing basement window has tempered or laminated glass?
Tempered glass usually has a small etched logo or stamp in one corner, often from the manufacturer or a certification body. Laminated glass is visibly thicker with a plastic layer sandwiched in the middle, though the easiest way to know for sure is to have a contractor check it during an inspection.
Should I replace the glass myself or hire a contractor?
Swapping glass alone, without touching the frame or the opening, is sometimes doable for a handy homeowner with the right glazing tools. But if the opening needs resizing, the frame is damaged, or the window well needs work, that involves cutting concrete and structural considerations that call for a licensed professional. When in doubt, get a free estimate before you start cutting.