Alpine's new Steel Portal Range delivers clearspans up to 50m, built for farms and contractors that have outgrown standard shed solutions
For more than 30 years, Alpine’s timber pole sheds have provided clearspans up to 20 metres, delivering the strength, practicality, and durability Kiwi farmers rely on. Now, with the introduction of a new structural Steel Portal range, Alpine can offer clearspans up to 50 metres.
For some farms and large contractors, the ever-increasing need for bigger, more capable equipment has required more substantial storage. Machinery is getting larger. Herd homes are scaling up. Workshops are expanding. And as that growth happens, the buildings that support it need to evolve too.
That’s why Alpine has introduced the Steel Portal Range – large-scale structural steel sheds designed for operations that demand more space, more strength, and more structural capability.
Responding to Growth
The decision to develop the Steel Portal Range wasn’t driven by trends. It was driven by conversations.
Across the industry, machinery is getting wider, taller and heavier. Dairy farms are requiring expansive herd homes with uninterrupted internal layouts, and contractors are demanding large clearspan workshops without internal columns getting in the way. In short, the scale of modern operations is increasing.
Alpine’s standard timber pole system has served over 5000 customers exceptionally well. But for operations pushing beyond 20 metres of clearspan, it recognised an opportunity to deliver something purpose-built.
The result is a structural steel portal system delivering clearspans from 20 to 50 metres, designed for those operating at a larger level.
This isn’t about replacing the timber range. It’s about expanding what’s possible under the Alpine name.
What Makes the Steel Portal System Different?
At its core, the difference comes down to structure.
Alpine’s traditional design consists of timber poles with a structural steel rafter in the roof. They are incredibly effective and economical for a wide range of agricultural applications.
The Steel Portal Range, however, uses full structural steel legs and rafters instead of timber poles. These rafters form a rigid frame system capable of achieving significantly larger spans – up to 50 metres wide – without internal columns. For farmers and contractors, that uninterrupted space is key.
Whether it’s large-scale implement storage, rural workshops, or herd homes, the absence of internal columns creates flexibility that’s difficult to achieve in smaller structural systems.
Engineered for Long-Term Durability
The Steel Portal Range is engineered using 5-10mm thick structural steel with bolted and welded connections. This ensures long-term durability and superior performance in demanding environments.
Importantly, these sheds are designed to meet 50-year building consent standards – the longest available in New Zealand. This sets them apart from lighter, cold-rolled systems that typically use 1-2mm thick steel and only meet 25-year consent requirements.
So why does that matter? Because a building of this scale isn’t temporary infrastructure. It forms part of a long-term plan – protecting valuable assets and supporting operational efficiency not just today, but for the generations to come. At this level, a shed becomes part of the family farm itself. It’s expected to still be standing when the next generation steps in to carry the farm forward.
For Alpine, quality is not an upgrade – it’s the baseline. And among the farmers it works with, quality is not an option, it is a way of life.
Cost-Effective Modular Kitset Design
While the structure is substantial, the system has been designed with efficiency in mind.
Drawing on over 30 years of experience and strong industry partnerships, the Steel Portal Range has been value-engineered to deliver cost-effective, large-scale builds.
Kitset pricing for a roof-only structure begins from approximately $200 per m2, making large scale buildings more accessible for those with expanding operations.
The modular nature of the system ensures streamlined design, manufacturing, and installation processes. Every component is engineered for precision. Every detail is considered. This isn’t overengineering for the sake of it. It’s a thoughtful design, built to endure the demands of large-scale operations.
Birdproof Design? Here’s what to know
The Steel Portal Range is designed with standard C-purlins and, in many cases, lattice rafters, meaning the design is not fully bird-proof as standard. For operations where bird control is essential, bird-proofing upgrades are available, with Alpine able to guide customers through the most suitable solution.
Built for Scale: Where They Perform Best
The Steel Portal Range is designed for operations working at scale. It is not a one-size-fits-all, but a system purpose-built for demanding agricultural applications, including:
Herd homes: Increasing cow comfort, milk production, and protecting paddocks from over-grazing.
Implement & machinery storage: Maximising internal space and keeping expensive machinery protected from the elements, helping to reduce wear and maintain resale value.
Large-scale workshops: Providing expansive working environments where equipment can be serviced efficiently, reducing downtime and keeping operations running in all conditions.
Future-Ready Infrastructure
Agriculture is cyclical. It’s seasonal. But it is also progressive.
Technology continues to advance. Equipment evolves. Compliance requirements change. Business models adapt. The most resilient operations are those that take a long-term view.
Investing in a large-scale structural steel portal shed is not simply about meeting today’s demands. It is about planning 5, 10, 20, or even 50 years ahead. It’s about building infrastructure that will support the next stage of growth – and, ultimately, the next generation.
When something of this scale is built, it needs to be done once and done right.
Conclusion
Introducing a steel portal system does not represent a departure from Alpine’s foundations.
As a three-generation, family-owned business, Alpine remains committed to its purpose: creating buildings that endure and legacies to be proud of. That commitment drives continuous improvement, delivering smarter, faster, better buildings for modern New Zealand farming.
The Steel Portal Range reflects that same philosophy. Engineered for operations working at scale, it combines structural strength with long-term durability.
Because when an operation grows, its infrastructure must be built to match today’s scale and built to endure for generations.
It’s still Alpine. But now, it’s built even bigger.
