Aluminium vs Steel vs Timber
Each material genuinely wins at something. Here is what each is actually good at, including where aluminium is not the right answer.
Aluminium
The main argument is corrosion. Aluminium does not rust, which removes the failure mode that ends most metal fencing — particularly near the coast, where salt gets into any breach in a steel coating and works outwards from there.
It is also light. A lighter gate leaf puts less leverage on its hinges and posts, sags less over years of use, and is easier for a motor to move. On a wide driveway gate that difference is significant.
The trade-off is hardness. Aluminium dents more readily than steel under direct impact. On a boundary fence or a gate that is a fair exchange for never dealing with rust; on something that will be repeatedly knocked, less so.
- Wins on: corrosion resistance, weight, maintenance
- Loses on: dent resistance, raw material cost
- Best for: coastal properties, wide or automated gates, low-maintenance boundaries
Steel
Steel is stronger and harder than aluminium, which matters where a gate will take genuine physical abuse — commercial and industrial sites, rural entries dealing with stock or machinery.
Raw material is typically cheaper, and for very large spans the extra strength can allow lighter-looking sections.
The problem is always rust. A steel gate's life is determined by its coating, and the coating fails first where water sits — the bottom rail, the welds, the fixing points. Near the coast that is a matter of years rather than decades. Galvanising helps considerably but does not make it a non-issue.
- Wins on: strength, impact resistance, raw material cost
- Loses on: corrosion, weight, long-term maintenance
- Best for: commercial and industrial use, inland rural entries
Timber
Timber has a warmth and texture that neither metal can copy. On a period home, a genuine timber picket fence is still the most authentic option, and no woodgrain coating quite matches it up close.
It is also easy to modify on site and generally the cheapest option up front.
The costs come later. Timber moves with moisture, so gates swell and stick in wet weather and shrink in dry. Posts rot at ground level. Pickets work loose off rails. And the finish needs redoing on a cycle that never ends. In a wet or coastal climate that maintenance burden is substantial.
- Wins on: appearance, authenticity on period homes, upfront cost
- Loses on: movement, rot, ongoing maintenance
- Best for: heritage frontages where authenticity matters most
How to actually decide
If you are within a few streets of the ocean, aluminium is the clear answer and the argument is not close.
If the gate needs to survive being hit by machinery, steel is the honest recommendation.
If you have a heritage home where an authentic timber picket fence is part of its character and you are prepared for the maintenance, timber is a legitimate choice — though aluminium pickets in the correct proportions get you most of the look with none of the upkeep.
For most suburban gates and fences, aluminium is chosen because it is the option you stop thinking about after it is installed.
