Metal gates look like the simplest thing in the world from the outside. Some bars, a frame, a couple of hinges, done. Then you actually try to build one, or try to buy one that lasts, and you find out real fast that “metal gate” covers about forty different fabrication methods that all photograph the same and behave completely differently after a few seasons of weather and abuse.
So here’s the breakdown of how metal gates actually get made, what the styles are, what materials people genuinely use, and where the whole thing quietly goes wrong. No sales pitch, just the mechanics.
The uncomfortable truth about “wrought iron”
Almost nothing sold as wrought iron today is wrought iron. Real wrought iron hasn’t been commercially produced in most of the world for decades. What you’re actually buying is mild steel — usually hollow tube or solid bar — welded, ground, and coated to look like the old stuff.
That’s not a scam, it’s economics. Genuine wrought iron is soft, fibrous, and a pain to weld with modern processes. So when someone says “wrought iron gate,” they’re describing a style, not a material. Ask what the actual alloy and wall thickness is instead, and you’ll get answers that mean something.
Materials that actually get used
- Mild steel — the default. Cheap, strong, welds easily, and rusts the second your coating fails. Tube in the 14 to 11 gauge range is standard for ornamental work; anything structural goes thicker, often 1/8 inch and up.
- Aluminum — won’t rust, roughly a third the weight of steel, which matters a lot when you’re hanging a 12-foot driveway gate. The tradeoff is stiffness: aluminum sections need to be chunkier to resist flexing, and it welds differently. It also plays badly with steel and concrete — put them in direct contact and you get galvanic corrosion eating the aluminum.
- Stainless steel — corrosion resistant and expensive. Grade matters enormously. Higher-alloy stainless is what you want near saltwater. Welds need post-weld cleaning and passivation, otherwise the heat-affected zone rusts while the rest of the gate stays shiny.
- Weathering steel — the rust-look stuff. It forms a stable oxide layer and stops corroding, but only with repeated wet-dry cycles. It also bleeds rust stains onto everything underneath it forever, which nobody mentions until the driveway is orange.
- Cast and ductile iron — mostly shows up as decorative elements, finials, scrolls, and spears. Brittle. Great for looks, bad for anything that takes an impact.
Operational styles: how the gate moves
This is the part that actually determines cost, complexity, and how much you’ll hate your life in five years. The look is secondary.
Swing gates
Single or double leaf, hinged on posts, opening inward or outward. Simplest to fabricate, hardest to get right structurally. All that gate weight hangs off a hinge and transfers a massive leverage load into the post base. Undersize the post or the footing and the gate sags within a year. Guaranteed.
Sliding gates
The gate rolls sideways along a track or hangs from an overhead rail. Needs flat, level ground along its whole travel path and a solid run of concrete. No swing arc, so it works where a swing gate would hit a car or a wall. The catch: any debris in the track jams the whole thing.
Cantilever gates
A sliding gate with no ground track at all. Instead, the gate is supported by a counterbalance section that stays on the anchored side, riding on rollers with a captive guide. The counterbalance typically runs a third to half the length of the opening, so you need clearance behind the gate, not just beside it. Brilliant for uneven or snow-covered ground. Bad if the fabricator gets the counterbalance math wrong, because then it just tips.
Bi-fold and telescopic gates
Bi-fold leaves hinge in the middle and fold back on themselves, so they need far less clearance than a swing gate. Telescopic systems stack multiple leaves that slide and gather behind each other. Both are heavy on moving parts and hardware, which is exactly where failures happen.
Vertical and barrier styles
Some gates lift straight up or over like a garage door, which is useful in tight urban spots. Separately, there’s a whole category of security-rated barrier gates built to stop vehicles. Different engineering, different price bracket, different world.
Aesthetic styles, briefly
- Ornamental / traditional — scrollwork, pickets, finials, spears. Still the most common residential look. Lots of labor, lots of welding, lots of places for coating to fail.
- Modern flat bar and tube — clean horizontal or vertical slats, no fuss. Fewer joints means fewer rust points, so it’s actually the lower-maintenance option despite looking expensive.
- Laser-cut and plasma-cut panels — sheet steel cut into patterns, often backed with a second layer. Striking, but thin sheet flexes, and the cut edges are where coatings chip first.
- Rural and utility — tube frames with wire mesh, grid, or expanded metal infill. Cheap, honest, tough.
Infill options
Between the frame members you can run pickets, tube slats, perforated sheet, welded wire mesh, expanded metal, or glass and composite panels. Each one changes the weight, the wind load, and where water collects. Solid infill turns a gate into a sail, and your hinges will find out.
Finishes — where builds quietly fail
Coating is where most gates die, not the steel.
- Powder coat looks great and is thin at edges and weld toes. Sharp corners and slag left under the coating become rust starters.
- Hot dip galvanizing is the gold standard for corrosion, but hollow sections need vent and drain holes drilled in the right places. Skip them and trapped moisture turns the dip tank into a steam bomb. That’s not a metaphor.
- Zinc-rich primer plus topcoat is the field-repair answer for scratches and welds you had to touch up on site.
Layering galvanizing under powder coat can work, but only if the shop knows the outgassing quirks. Otherwise you get pinholes and blistering.
Hardware, hinges, and the sag problem
Hinge selection is where amateurs and pros separate. Weld-on barrel hinges, adjustable hinges, and ball-bearing units all carry different loads. Adjustable hinges exist specifically because gates move over time and you need to correct for it.
Automation adds another layer. Operators are rated by gate weight and gate length, and most failures are geometry mismatches, not dead motors. A gate that’s slightly out of plumb will burn through an operator in a year. Safety gear — photo eyes, edge sensors, entrapment protection — isn’t optional on anything that moves.
What shops don’t put on the quote
Fabricators have minimums. Nobody wants to set up a powder coat line or a galvanizing run for one gate, so small jobs get priced as if they’re big ones. Shipping heavy steel long distances is often more expensive than the fabrication itself, which is why local sourcing keeps winning. And custom means custom: templates, jigs, and fixturing eat hours before a single bar gets cut.
The bottom line
Pick the operational style first, because that decision drives everything — footing, clearance, hardware, automation, and whether you’ll be adjusting it every spring. Then pick the material based on your climate and how much maintenance you’ll actually do, not how it looks in a catalog. Then treat the finish and the hardware as seriously as the frame, because that’s where the money quietly leaks out.
Get those three things right and a metal gate is a thirty-year object. Get them wrong and you’ve bought a very expensive thing that sags, rusts, and jams — and looks exactly like the good one in every photo you’ll ever take of it.