Aluminum vs Wrought Iron Gate for San Antonio Driveways

Aluminum does not rust and weighs about a third of what steel does. Ornamental steel is stronger, heavier, and looks more substantial. For coastal air, sprinkler overspray, or any automated gate where you want the operator running easy, aluminum. For inland properties where mass and presence are the point, ornamental steel.

One clarification first, because the terminology is a mess. Almost nothing sold as "wrought iron" today is actual wrought iron, which is a historical material largely out of production. What you are buying is ornamental steel — usually mild steel tube, fabricated in traditional patterns. That is not a scam, it is just the correct name.

The comparison

	Aluminum	Ornamental steel ("wrought iron")
Weight, same dimensions	~1/3 of steel	Baseline
Rust	Does not rust	Rusts wherever coating fails
Strength and stiffness	Lower, needs heavier sections	Higher
Typical cost, quality build	Comparable or slightly higher	Comparable
Operator size needed	Smaller	Larger
Post and footing demands	Lighter	Heavier
Refinishing over time	Rare	Expect a cycle
Repairability by welding	Specialist work	Any competent welder
Feel and sound	Lighter	Solid, substantial

Weight is the sleeper issue

Aluminum runs around 169 pounds per cubic foot; steel around 490. Same gate design, roughly a third the mass.

That number cascades:

• Smaller operator. A lighter gate lets you run an operator well below its rated capacity, and an operator working easy lasts far longer than one working at its limit. This is the most common cause of premature opener failure we see.
• Less post structure. A gate leaf is a lever, and a lighter leaf puts less overturning force on the hinge post and its footing.
• Less sag over time. Every gate wants to droop at the latch end. Less weight, less droop.
• Easier manual operation during a power outage.

If you are automating a wide gate, the weight advantage of aluminum is worth real money — not on the gate invoice, but on the operator, the posts, and the service calls.

Rust, without the fairy tales

Steel rusts. That is not a defect, it is chemistry, and the entire question is what stands between the steel and the weather.

The durable specification is hot-dip galvanizing to ASTM A123, then powder coat over that. The zinc layer protects the steel even where the powder coat is chipped, which it will be, because gravel and string trimmers exist.

The common shortcut is powder coat applied straight onto prepped bare steel. It looks identical on day one. In year four, every chip has an orange halo, and the bottom rail — where water sits — starts blooming.

Ask which one is in the quote. Two "ornamental iron gates" at different prices are frequently this difference, and it is the single most useful question you can ask a gate fabricator.

Aluminum sidesteps this entirely. It oxidizes on the surface and then stops. Powder coat on aluminum is for color, not protection.

Where aluminum gets a bad reputation

Because of bolted panel kits.

A lot of the aluminum gates people have seen are assembled from extruded pickets and rails bolted or screwed together. They are light, they are cheap, and they rattle. Over time the fasteners work loose and the gate develops a distinct wobble.

A welded aluminum gate built from proper wall-thickness tube is a completely different product. It is stiff, it is quiet, and it looks like a real gate. It also costs meaningfully more than the kit, which is why the kit is what most people have encountered.

If you are considering aluminum, specify welded construction and ask about wall thickness. If the quote is remarkably cheap, it is a kit.

Where steel is genuinely the right answer

Security presence. A heavy ornamental steel gate communicates something an aluminum gate does not. That is subjective and it is also a real reason people buy them.

Large ornamental designs. Dense scrollwork and complex patterns are steel's home ground. The material is stiffer, so intricate work holds its shape.

Repairability. Any competent welder can fix mild steel. Aluminum welding needs specific equipment and skill, so a damaged aluminum gate is more likely to need the original fabricator.

Impact. A gate that gets nudged by a truck or a tractor fares better in steel.

Our recommendation

Coastal air, heavy sprinkler overspray, or a pool nearby: aluminum. Salt and chlorinated water find every chip in a coating, and you will be refinishing a steel gate on a schedule you did not sign up for.

Automated gate over about 12 feet per leaf: aluminum, for the operator and post savings alone.

Inland, manual or lightly automated, and you want the classic look: ornamental steel — galvanized then powder coated, not powder coated alone.

And the honest note: the metal matters less than the posts. We have replaced beautiful gates in both materials that failed because the hinge post was undersized or its footing too shallow. Whatever you pick, spend on the structure holding it up and the operator moving it. Our repair versus replace guide covers how to tell whether it is the gate or the post that is failing.

What to ask on any quote

1. Wall thickness of the tube, in both materials
2. Welded or bolted construction
3. Galvanized before coating, for steel
4. Post size, footing depth and diameter
5. Gate weight, so you can check the operator is not running at its limit
6. Finish warranty, and what voids it

San Antonio Gate Pros fabricates and installs aluminum gates, ornamental iron gates, and automatic openers across San Antonio and the San Antonio area. We will tell you which metal your specific conditions call for, including when the cheaper one is correct. For pricing, see our driveway gate cost guide or our wrought iron gate guide.

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