Why does tempered glass cost more?

Tempered glass is heat-treated so it breaks into small, blunt pieces instead of sharp shards. The extra manufacturing step adds cost, which is why it's priced as its own line.

Can I skip tempered glass to save money?

No. Where code requires it, we can't install standard glass. It's there to keep your family safe and to pass inspection.

Tempered glass requirements

Building code requires tempered safety glass in places where people could fall or walk into the glass. NRG checks every opening, and any window that needs tempered glass is listed as its own line with its own price on your quote — before you buy.

The size rule (all four must be true)

A single pane of glass is over 9 square feet.

Its bottom edge is less than 18 inches above the floor.

Its top edge is more than 36 inches above the floor.

A walking surface is within 36 inches of the glass.

When all four are true, that window needs tempered glass.

Other places that always need tempered glass

Glass in or forming part of a door.

Glass within 24 inches of either edge of a closed door when its bottom edge is under 60 inches above the floor.

Glass near a tub, shower, spa, sauna, steam room or pool when its bottom edge is under 60 inches above the standing surface.

Glass next to stairs, a ramp or a landing when its bottom edge is under 36 inches above the walking surface.

Glass used as a guard or railing.

How we measure

We measure each individual pane of glass, not the whole window unit, and the visible glass edge, not the frame. Heights are measured from the finished floor or walking surface the glass faces.

Code exceptions exist, such as a protective bar or a wall between a door and the glass. When there's any doubt, we treat the glass as tempered and confirm with the local building department.

How it shows up on your quote

Every opening that needs tempered glass is listed on your quote as its own line item with its own price, so it's never a surprise charge later.

Before you check out, you'll see that list and check a box confirming you've read these requirements. If the verification visit finds a change, we'll show you the updated line and you'll approve it before anything is ordered.

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Common questions

Why does tempered glass cost more?: Tempered glass is heat-treated so it breaks into small, blunt pieces instead of sharp shards. The extra manufacturing step adds cost, which is why it's priced as its own line.
Can I skip tempered glass to save money?: No. Where code requires it, we can't install standard glass. It's there to keep your family safe and to pass inspection.