Glass railings are where homeowners get taken, because the part everyone compares is the glass and the part that actually costs money and keeps people alive is the anchoring. Before you spend real money on a balcony, stair or pool-deck guard, ask whoever is quoting you these three questions. How they answer tells you everything.
1. What is the required height here?
It is not one number. Residential is different from commercial. A stair guard is different from a balcony guard. A pool barrier has its own rules. And in every case your local building department has the final say on what applies to your property.
Confirm the required height before anybody orders glass. A railing that comes up an inch short is a railing you are taking back out at your own expense. If a quote does not name the height it is built to, ask.
2. Does a four-inch sphere pass anywhere?
The gap rule: no four-inch sphere may pass through any opening in a guard. Not under it, not beside it, not at the post, not where the run meets a wall. This is the item that fails inspection more than anything else on a glass railing, and it is almost always the gap under a bottom rail or the gap at the end of a run.
It is also the easiest thing for you to check on the drawing before the glass is cut. Ask to see the gap at the bottom and at every termination.
3. Tempered or laminated?
Tempered glass breaks into small pebbles. All of it, at once. On a balcony, that is a guard that just stopped existing. Laminated glass has an interlayer, so when a lite breaks it cracks but stays in the frame in one piece.
Anything with a drop behind it, you want laminated, or laminated-tempered, and in many cases the code requires it. If someone quotes you plain tempered for a balcony guard, ask why.
The question nobody asks: what is it anchored into?
The glass is the cheap part. The base shoe, the spigots or the posts, and what they are bolted into, is the job. A concrete balcony means core drilling and the right anchors. A wood deck means blocking underneath, because a lag into a single joist is not a guard. If the quote does not say what the railing is anchored into and how, that is not a quote yet.
Height, gap, glass, anchor
Four things. Done right, a glass railing outlasts the house. We measure every run on site, confirm the requirements with the building department for your specific property, and put the anchoring spec in writing on the estimate. If a quote you already have does not do that, bring it to the free visit and we will read it with you.
