Aluminium vs Steel Driveway Gates: The Real Trade-Offs
Aluminium
- Will never rust, even in coastal or high-humidity locations
- Roughly one-third the weight of steel — easier on motors and hinges
- Powder-coat finishes last 15–25 years with no maintenance
- Modern, clean aesthetic suits contemporary new-builds and slab-style gates
- Recyclable at end of life
- 30–50% more expensive than equivalent steel gates
- Softer metal — dents rather than bends under impact
- Limited to welded or bolted construction — cannot be hand-forged
- Structural profiles are chunkier than steel for the same strength
Contemporary properties, new builds, automated sliding gates where weight matters, and exposed sites where rust would be a problem.
Steel (Mild and Wrought)
- Lower material cost per kg
- Can be hand-forged into traditional ornamental designs — scrollwork, spear tops, twisted bars
- Stronger impact resistance — bends rather than dents
- Easier to repair locally if damaged
- Galvanised-and-powder-coated finish gives 20–30 years of service
- Will rust if finish is compromised — chips need touching up promptly
- Heavy (120–300 kg per gate pair), demands robust motors and piers
- Cheap mild steel gates without proper galvanising can corrode in under 10 years
- Welded steel cannot replicate traditional forge aesthetics
Traditional, period, and listed properties, ornamental designs with scrollwork or decorative tops, and anywhere a classic Hertfordshire country look is wanted.
The verdict
Match the metal to the architecture. Contemporary home with clean lines and a sliding gate: aluminium. Period cottage, rectory, or Victorian villa wanting a pair of wrought iron swing gates with scrollwork: hand-forged steel. The worst outcome is mismatching — aluminium on a period home often looks wrong regardless of finish.
The rust question, honestly
Steel rusts. This is not a design flaw, it is chemistry. What matters is whether the finish prevents it reaching the metal. Hot-dip galvanising followed by polyester powder coating is the industry standard and gives 20–30 years of protection in most Hertfordshire locations. Paint-only steel gates are a false economy.
Weight and automation
An aluminium slider at 4 metres weighs roughly 80 kg. A galvanised steel slider the same size weighs 180–220 kg. That weight difference can be the deciding factor on which motor you need and therefore thousands of pounds in motor cost over the life of the gate.
Forge work vs fabrication
Hand-forged wrought iron is a specific craft — heated, hammered, and shaped by a blacksmith. Most "wrought iron" gates sold today are mild steel bent cold in a press, which looks acceptable but lacks the character of real forge work. If you want true ornamental metalwork, budget accordingly and ask to see the forge.
Finish options
Both metals accept polyester powder coating in any RAL colour. Aluminium can also be anodised for a matt metallic finish that never needs repainting. Steel can be hot-galvanised to a zinc finish (industrial look) or galvanised-then-powder-coated (the domestic standard).
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