A railing earns its keep in one moment — when someone's foot slips on a wet step and their hand grabs for it. Everything else about it is appearance. So the first question on any railing job isn't what it should look like, it's what it's attached to and whether that attachment will hold a falling adult.
Grab the top rail and push it side to side, then pull it toward you. A little flex in a long run of thin steel is normal. Movement at the base is not. If the post rocks and you can see a halo of cracked concrete or hairline spidering around the anchor plate, the fastening has failed, and no amount of welding up top will fix it — the repair starts at the step, not the rail. On older porches around Boyle Heights and Maywood, the common failure is a post set directly into a drilled hole and packed with mortar decades ago. Water wicks in, the embedded steel swells as it corrodes, and the concrete splits from the inside. That post cannot be re-set in the same hole; the hole is now bigger than the post and the surrounding concrete is compromised.
Surface rust that wipes off orange on your thumb is cosmetic and usually means the coating has chalked out. Rust that has flaked into layers, or left a pitted, scaly texture you can dig a screwdriver into, has eaten section thickness. Pay attention to where the pickets meet the bottom rail — that joint collects water, dirt and sprinkler overspray, and it rots out from the underside where nobody looks. If a picket snaps free when you wiggle it, the rest are further along than they appear.
Custom metal railings exist because stairs are never the same twice. A run of concrete steps poured sixty years ago has settled unevenly, the treads are different depths, and the rise from the top step to the landing rarely matches the rise between the others. Anything built off a catalogue length has to be forced to fit, which is how you end up with a rail that meets the post at an awkward angle or sits at the wrong height halfway up. Proper work means measuring the actual stair — rise, run, total travel, where the rail must terminate so it doesn't jut into a walkway — then cutting and welding to those numbers.
The design choices that matter most are structural, not decorative. Picket spacing is the main one, and it matters enormously if small children use the stairs. Solid bar versus hollow tube changes both the weight and how the railing handles impact. Where the railing meets a wall, a wall-mounted bracket into solid masonry is far stronger than one into stucco over a hollow cavity, and a competent installer will find the substrate before deciding. On balconies, landings and the raised loading areas common in Vernon's commercial buildings, the loads are higher than on a three-step stoop and the posts need to be spaced and anchored accordingly.
What drives the cost is total length, the number of posts, the number of corners and level changes, whether the fabrication is plain pickets or involves scrollwork and repeated decorative elements, and the condition of what you're anchoring into. A railing on sound concrete goes in faster than one that needs the step patched or a new footing poured first. Finish matters too — a primed and painted railing costs less up front than a galvanized or powder-coated one, and needs repainting sooner. Second-floor and hillside work takes longer simply because the material has to be carried and held in place.
Ask how the posts will be anchored and into what — "we'll bolt it down" is not an answer; ask about base plate size, anchor type and embedment. Ask whether fabrication happens off site and is brought in for fitting, or whether it's welded in place, and how the welds will be ground and coated, because an uncoated weld is where the rust starts. Ask what the finish is and what it will need in five years. Confirm picket spacing in inches if children are a concern.
The failures you'll regret are the quiet ones: anchors sunk too shallow into thin concrete, a railing tacked to spalling masonry, bare steel left inside a joint that traps water. None of it shows on install day. All of it shows later, usually when someone leans on it.