What Are Large Span Steel Buildings? Clear Spans, Internal Space, and Why It Matters

If you've been searching for a shed or commercial building that gives you serious room to work (no columns breaking up your floor plan, no posts getting in the way of machinery or stock) then you've probably landed on the term "wide span sheds."

Wide Span vs. Clear Span: What’s the Actual Difference? 

“Wide span” is a general descriptor. It just means the building is broad. But width alone doesn’t tell you what’s happening inside the building. It doesn’t tell you whether there are internal columns holding the roof up, or whether the entire floor plan is genuinely open. 

A clear span building is one where the structural load is carried entirely by the portal frame. There is no internal support. That’s the distinction that matters most when you’re planning a workshop, storage facility, aircraft hangar, equestrian arena or commercial warehouse. 

At Coresteel, we build to true clear span standards. What that means in practice: 

• You keep 100% of the floor space. No column positions to design around, no restricted traffic flow, no awkward zones where forklifts can’t turn. 

• Interior fit-out is entirely up to you. Mezzanines, partitions, racking systems. The structure doesn’t dictate your layout. 

• Future flexibility is built in. Businesses change. A clear span building can be reconfigured without structural compromise. 

Why Does Internal Space Matter So Much? 

Think about what a single internal column actually costs you. In a 20m wide shed, one central post doesn’t just take up a few hundred millimetres of floor space. It creates a workflow problem and can cause issues such as limiting storage options and roller door positioning, vehicle maneuverability and safe staff movement. 

Now multiply that across a larger building with multiple internal supports, and you start to understand why serious operators specify clear spans from the outset. Not as a luxury, but as an operational requirement. 

Coresteel’s warehouse construction and commercial buildings are built to clear span standards, giving you the internal space to run your operation on your terms. 

What Spans Are Achievable? 

This is where modern steel engineering really delivers. Clear span widths that would have been impractical or expensive even two decades ago are now standard across the industry. 

Common clear span widths for commercial and rural applications in New Zealand: 

With engineered steel portal frames, achieving a 30m clear span is routine. Larger spans are absolutely possible. It’s a matter of design specification and load requirements, not structural limitation. 

Steel Frame Sheds: Why the Frame Type Matters 

Not all steel buildings are equal. The structural system underneath determines the building’s performance, longevity and versatility. Most high quality wide span sheds in New Zealand use one of the following frame types: 

Portal Frame 

The industry standard for clear span buildings. A portal frame uses rigid knee joints between the columns and rafters, allowing the entire lateral load to be transferred to the foundation without internal bracing. This system makes true clear spans possible large buildings. It’s efficient, well understood by engineers and proven over decades of New Zealand conditions. 

Modular or Multi-Bay Frame 

When you need extreme width, two or more clear span bays can be joined with internal valley columns between bays. Each individual bay still remains column free internally. This gives you wide spans overall while keeping structural members to a minimum. 

Tapered Beam Systems 

Used in a lot of commercial applications, tapered beams allow the structure to be optimised for load distribution, reducing steel weight and material cost without compromising span capacity. 

At Coresteel, DonoBeam is our tapered box beam that delivers high spans and greater design flexibility. Our buildings are engineered to New Zealand standards (NZS 3404 for steel structures) and designed for local conditions including wind zones, snow loads, and seismic requirements. So your building performs where it’s planted, not just on paper.  

5 Questions to Ask Before You Spec a Wide Span Shed 

Before you call a builder, get clear on these: 

1. What is my actual span requirement?Don’t just estimate. Measure your largest intended use case (the widest vehicle, the longest piece of equipment, the biggest machine) and build around that. It’s far cheaper to spec correctly now than to extend later. 
2. Do I need true clear span, or are internal columns acceptable? Be honest about your workflow. Some storage applications don’t need uninterrupted floor plans. Others absolutely do. Know the difference before you compromise. 
3. What are the site specific engineering requirements? New Zealand’s wind and seismic zones vary significantly. A building engineered for Canterbury’s wind exposure will be designed differently to one in Northland. Your builder should be asking you about your site, not just your dimensions. 
4. What access openings do I need?Roller doors, sliding doors, personnel access. The size and position of openings affect your frame design. Tall openings for B trains, combines, or aircraft have structural implications that need to be addressed at design stage. 
5. What will the building be used for in five or ten years?Clear span buildings are easier to adapt over time. Ifyou’re not sure what your business will need, build flexibility in now. 

Wide Span Steel Buildings in New Zealand: The Local Context 

New Zealand’s rural and commercial sectors have particular demands that don’t always translate from overseas building guides. A few things worth knowing: 

Consent requirements vary by region and building size. Most structures above 10m² require building consent, and larger commercial or industrial buildings will need engineering sign off. Your builder should be able to support the consent process, not just hand you a drawing set. 

Seismic and wind design is non negotiable. NZ’s seismicity and coastal wind exposure mean buildings need to be properly engineered, not just sized. Always confirm your builder is working with a registered New Zealand structural engineer. 

Agricultural buildings have specific exemptions in some regions, but this doesn’t mean they should be underbuilt. Farm sheds carry real loads including silage, hay, and machinery, and should be designed to handle them safely over a working lifetime. 

What Makes a Good Wide Span Shed Builder? 

The market for steel frame sheds in New Zealand ranges from genuine engineering specialists to companies reselling imported kit buildings with minimal local adaptation. The difference matters enormously when you’re making a 40 year investment in your property. 

Look for: 

• Local engineering capability. Your building should be designed by a structural engineer registered in New Zealand, not to a generic offshore template. 

• Full consent support. A quality builder will help you navigate the consent process, not leave you to figure it out alone. See how Coresteel manages the process from design through to build. 

• Transparent pricing. Shed pricing should include everything that reaches your site including concrete, cladding, flashings, doors, and gutters. Watch for quotes that strip out key components. 

• Proven project history. Ask to see completed projects of similar scale and complexity to yours. 

Ready to Think About Your Build? 

Clear spans change what’s possible inside a building. Whether you’re planning a new rural shed, expanding a commercial facility, or building the workshop you’ve always needed, getting the structural approach right from the start is the decision that pays off every year after. 

Coresteel designs and builds wide span steel buildings across New Zealand, engineered for local conditions and built for the long run. 

Get in touch with the Coresteel team
Or call us to talk through your project before you commit to anything.