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Both materials last for decades outdoors in the UK. Neither rusts the way mild steel does. The real difference is how each one ages, and what eventually wears out first.

Aluminium relies on its powder-coated finish to look good. Stainless steel relies on its grade. Choose the wrong grade for a coastal home, or chip the coating and leave it, and you'll see problems early.

There's also a practical point many comparisons miss. For any drop over 600mm, the safety rules may make the decision for you. We'll cover that below.

Aluminium vs stainless steel at a glance

How does aluminium cope with UK weather?

Aluminium forms a thin oxide layer as soon as it meets air. That layer stops the metal corroding the way steel does. It's why aluminium doesn't rust.

Our aluminium balustrade range is made from alloy 6005 and finished in matt black powder coat. The coating gives the colour and an extra barrier against weather. Rain, frost and cold snaps don't trouble it.

What shortens its life?

Most problems start with the finish, not the metal. A deep scratch or chip lets moisture under the coating. Left alone, the coating can start to lift around it.

Three other things cause trouble. Wet cement or mortar touching the posts, de-icing salt splashed onto the base, and contact with a different metal. That last one is called galvanic corrosion. Our warranty excludes all three, so keep fixings and surfaces compatible.

Sunlight will slowly soften the colour over many years. That's normal for any powder coat, and our finish warranty covers peeling, blistering and flaking rather than gradual fading.

How does stainless steel cope with UK weather?

Stainless steel contains chromium. It forms a thin protective film on the surface and repairs itself if scratched. The metal underneath stays sound.

Why the grade matters: 304 vs 316

Grade 304 is common indoors and in sheltered spots. Grade 316 adds molybdenum, typically around 2%, which improves resistance to chlorides from sea air, pool water and road salt.

That's why every part of our stainless steel wire balustrade is 316 marine grade. Posts, wire rope and fittings all match, so one weak component doesn't let the rest down.

What is tea staining?

Tea staining is a light brown surface mark that appears when salt sits on stainless steel. It's cosmetic, not structural, and a clean usually removes it. It shows up most often near the coast.

Regular rinsing with fresh water stops salt building up. Our warranty treats tea staining as a surface condition that cleaning removes, rather than a defect.

Which is better for a coastal home?

Both work by the sea if you keep up with rinsing. The routine is slightly different.

For aluminium, rinse with clean fresh water at least every three months to remove salt. That's a condition of our coastal cover. Monthly is better on exposed sites. For 316 stainless, rinse monthly to keep tea staining away.

One warning applies to glass systems rather than wire. Our black glass balustrade fittings are powder-coated 304 stainless. We don't recommend them for coastal or poolside sites. Choose satin 316 fittings there instead.

How high is your drop? This often decides it

Under Approved Document K, guarding is needed where a drop is more than 600mm. Openings in that guarding must stop a 100mm sphere passing through. You can read the full guidance in Approved Document K on GOV.UK.

Our aluminium system gives a finished height of 1100mm with pickets at 96.5mm spacing. It's designed in line with BS 6180:2011 for domestic guarding, so it suits balconies, raised decks, patios and stairs.

Our wire system is different. The wires sit at 132mm centres, which is wider than the 100mm rule allows. So we only recommend it where the drop is 600mm or less. Think low deck edges, garden terraces, borders and low steps.

If your deck sits a metre off the ground, the question isn't which lasts longer. It's which one is suitable, and that's aluminium or glass. We cover the glass option in our guide to aluminium vs glass balustrades for decking.

What does each cost?

Our build-your-own aluminium kit starts at around £135 per linear metre. That covers posts, rails, pickets and assembly fixings. Ground fixings aren't included, because the right one depends on your surface.

Our wire balustrade kit is £180 per linear metre. It includes 316 posts, 3mm wire rope, swageless fittings and a 48.3mm stainless handrail.

Both ship on a pallet. Delivery to most of mainland UK is £60, and it's free on orders over £2,000.

How much maintenance does each need?

Wire rope relaxes a little in service, so expect to re-tension it now and then. The turnbuckles make that a quick job with basic hand tools. Aluminium has no equivalent task beyond checking fixings.

Which should you choose?

Choose aluminium if your drop is over 600mm, if you want a black finish, or if budget matters most. It's the more versatile system and carries the longer warranty.

Choose 316 stainless wire if your edge is low and you want the most open view possible. It suits modern homes and coastal gardens, as long as you're happy to rinse it monthly.

You can also mix the two. A common layout uses aluminium around a raised deck and wire along a low garden edge or terrace. Bear in mind that our aluminium comes in matt black, while the wire system is bright stainless silver, so the two read as a deliberate contrast rather than a match.

Inland homes aren't salt-free, either. Gritted roads and driveways spread salt in winter. If your balustrade sits near a gritted path, rinse the lower posts after cold spells, whichever material you choose.

Still unsure? Call our team on 01282 526428 with your drop height and location. We'll point you to the right system before you order.

Frequently asked questions

Does aluminium balustrade rust?

No. Rust is iron oxide, and aluminium isn't an iron-based metal. It forms its own protective oxide layer instead. The powder coat adds colour and a further barrier, so keep it free of deep chips.

Is 316 stainless steel better than 304 for outdoor balustrades?

Yes, for most UK outdoor sites. Grade 316 contains molybdenum, which improves resistance to salt and chlorides. It's the safer choice near the coast, around pools and anywhere road salt is used.

Can I use a stainless steel wire balustrade on a balcony?

Not our wire system. Its wires sit at 132mm centres, which doesn't meet the 100mm sphere rule for guarding. We recommend it only for drops of 600mm or less. Use aluminium or glass on balconies.

Which lasts longer by the sea, aluminium or stainless steel?

Both last well by the sea with regular fresh-water rinsing. Aluminium needs its coating kept intact. Stainless steel should be 316 grade and rinsed monthly to prevent tea staining.