Steel and aluminium are the two most popular carport materials in Cape Town, and both hold up well when specified correctly — but they suit slightly different priorities. Here’s how to think about the choice.
Strength and Load-Bearing
Steel generally offers greater raw strength, which can matter for larger spans or multi-bay structures. If you’re after a heavier-duty commercial installation, steel is often the go-to.
Corrosion Resistance
Aluminium naturally resists corrosion without additional treatment, which makes it a strong option for coastal properties. Steel can also perform very well near the coast, but relies on proper galvanising or a chromadek finish to stay protected.
Maintenance
Aluminium typically needs very little upkeep beyond an occasional wash. Steel holds up well too, but it’s worth keeping an eye on the coating over time, particularly in exposed, salty air.
Appearance and Finish
Both materials take a wide range of colour finishes. Aluminium tends to allow for slimmer, more contemporary profiles, while steel offers a more substantial, traditional look.
Cost
Material costs vary by project and current pricing, so there’s no fixed rule that one is always cheaper than the other. The best way to compare is to get a quote for both and weigh them against your priorities — see our pricing guide for more on what affects cost.
Installation Considerations
Aluminium is lighter to work with on site, which can slightly simplify installation on tricky-access properties. Steel’s extra weight and strength make it the more common choice for wider double-bay spans, where a lighter material would need more support posts to achieve the same coverage.
Quick Comparison
- Steel: stronger for large spans, needs a good paint or galvanised finish, generally the more affordable option for bigger structures.
- Aluminium: naturally corrosion-resistant, low maintenance, suits coastal properties and slimmer design profiles.
Our Recommendation
There’s no universally “better” choice — it depends on your property, budget and priorities. We’ll talk through both options honestly during your free site visit, and help you land on the material that actually suits your situation.
