Wrought Iron vs Aluminum Fence: Strength, Cost, and Rust

For most homeowners, aluminum is the better buy: it starts around $34 per linear foot installed versus $38 for iron, it will never rust, and it needs almost zero maintenance for decades. Choose iron (really welded steel, more on that below) when you need genuine security - a fence that resists prying, cutting, and vehicle impact - or when you are matching historic ironwork and want the visual weight that aluminum cannot fake up close.

That is the short answer. The long answer depends on your climate, your budget over 20 years instead of 20 days, and what the fence actually has to do. I have set both materials for years, and the right pick is usually obvious once you walk through the trade-offs below.

First, What You Are Actually Buying

Here is the thing most fence salesmen will not lead with: true wrought iron - the hand-forged, low-carbon iron worked on an anvil - has not been produced commercially at scale in decades. When a company quotes you a "wrought iron fence" in 2026, you are almost always getting one of two things:

• Welded steel: Tubular or solid steel pickets welded to steel rails, then galvanized and powder coated. This is 95 percent of the "iron" fence market. It is strong, heavy, and rigid - and it will rust anywhere the coating fails.
• True wrought iron: Custom work from an ornamental blacksmith shop, priced per project rather than per foot, usually reserved for historic restorations and high-end estate gates. If your quote is under $60 a foot, this is not what you are getting.

Aluminum ornamental fence mimics the look of steel picket fence using extruded aluminum alloy. The rails are hollow, the pickets are hollow, and the whole panel weighs a fraction of a comparable steel section. From the curb, a quality aluminum fence in satin black reads as iron. Grab a picket and flex it, and you will feel the difference immediately.

Cost: Closer Than You Think Up Front, Not Over 20 Years

Installed pricing starts at $34 per linear foot for aluminum and $38 per linear foot for welded steel ("iron"), and both climb from there with height, picket density, and decorative options:

• Aluminum: $34-$60 per foot. Residential-grade 4-foot panels sit at the bottom; commercial-grade 6-foot with double pickets and finials sits at the top.
• Welded steel: $38-$75 per foot. Heavier wall thickness, taller panels, and pressed-point security pickets push the number up fast. Custom ornamental scrollwork can double it.

On a typical 150-linear-foot project, that is roughly $5,100 to start for aluminum versus $5,700 for steel - a $600 gap that feels small on the proposal. The real gap shows up later. Steel needs repainting or spot-treatment on a cycle; aluminum does not. Budget for the fence you will own in year 15, not just the one you sign for.

Rust: Aluminum Wins, Full Stop

Aluminum cannot rust. It oxidizes into a thin, self-sealing layer that actually protects the metal underneath, which is why aluminum fence carries lifetime warranties on the material itself. Steel is the opposite: iron oxide is porous, it traps moisture, and once rust starts under the powder coat it creeps along the picket like a run in a stocking.

Where steel fences actually fail is predictable. Watch the welds, the bottoms of pickets where sprinklers hit daily, and any spot a string trimmer has chewed through the coating. Galvanizing under the powder coat buys you years - insist on it - but it delays rust rather than eliminating it.

If you live within a few miles of salt water, this stops being a preference and becomes a rule. Salt air destroys coated steel fence, and I have seen five-year-old steel installations along the Gulf that look twenty. Coastal homeowners from Florida to California should default to aluminum unless a security requirement forces steel - and if it does, spec marine-grade coating and plan on maintenance.

Strength and Security: Steel Wins, Also Full Stop

This is where the extra weight earns its keep. A welded steel picket resists bending, prying with a bar, and cutting far better than hollow aluminum. Aluminum pickets can be spread apart with hand pressure by a determined adult; steel pickets cannot. Steel panels also shrug off impacts - a kid's bike, a riding mower, a car bumper at parking speed - that will fold an aluminum section.

For genuine security applications (commercial perimeters, pool equipment yards in high-traffic areas, dog runs for large powerful breeds, anywhere you would otherwise consider bars on windows), steel is the honest answer. Look for welded rather than rackable screw-together panels, pickets extending above the top rail with pressed points, and posts set in concrete at least 30 inches deep - 36 in frost country.

For keeping a labrador in the yard and marking a property line? Aluminum's strength is plenty. Do not pay the steel premium for a security problem you do not have.

Pool Code: Both Pass, Aluminum Dominates

Both materials meet typical residential pool barrier requirements when configured correctly: at least 48 inches tall, no more than a 4-inch gap between pickets, no more than 2 inches of clearance at the bottom, no horizontal rails spaced where a child can climb them, and a self-closing, self-latching gate that swings away from the pool.

In practice, aluminum owns the pool fence market, and for good reason: it lives in a splash zone. Chlorinated and salt-system pool water is brutal on coated steel, and the fence closest to the water takes overspray every single day. Most aluminum manufacturers sell pool-code-specific panel styles with the picket spacing already compliant, which simplifies inspection. Verify your local code before ordering - some municipalities require 60 inches, and gate hardware requirements vary.

Maintenance: The 20-Year Ledger

Here is the ownership schedule nobody puts in the brochure:

• Aluminum: Hose it off once or twice a year. Tighten the occasional loose bracket. That is the list. The powder coat fades slightly over 15-20 years in hard sun, but it does not peel because there is no rust pushing up underneath it.
• Welded steel: Inspect annually for coating chips and touch up immediately with rust-inhibiting paint - a $12 can now saves a $200 panel later. Expect to wire-brush and repaint problem spots every 5-7 years in dry climates, faster in humid ones. A full repaint of a mature steel fence is a real weekend-eating job or a real invoice.

Side by Side

The Verdict, by Scenario

• Coastal or humid climate: Aluminum. No debate.
• Pool enclosure: Aluminum in a pool-code style, with a self-closing gate you test monthly.
• Security perimeter or large-dog containment: Welded steel, welded panels, deep-set posts.
• Historic home or estate entrance: Steel, or true custom ironwork if the budget allows - aluminum's hollow profiles give it away at close range.
• Slopes: Aluminum's rackable panels follow grade cleanly; steel usually needs stair-stepped panels and custom cuts.
• Set-and-forget homeowner: Aluminum. The $600 you save up front is the smallest part of the win.

One last field note: whichever metal you choose, the fence fails at the posts before it fails at the panels. Insist on posts set in concrete below your frost line, and ask the installer what gauge and wall thickness they are quoting - cheap bids hide their savings inside the tube where you cannot see it.

Get Quotes From Local Metal Fence Pros

Prices, coatings, and pool codes all vary by market, so get two or three local bids before you commit. Browse vetted installers in our fence company directory, or jump straight to your area - we cover markets from Dallas to Phoenix and everywhere between. Ask each bidder the same questions about gauge, galvanizing, and post depth, and the right choice will separate itself fast.