Agricultural sheds are production infrastructure. They are not the same as general farm sheds used for machinery storage or rural sheds built for lifestyle and hobby farm use. Grain storage, livestock facilities, and shearing sheds each carry specific structural, ventilation, and regulatory requirements that a standard shed catalogue will not address.

Key Takeaways

  • Grain storage sheds are classified as Class 7b under the NCC; sheds used for shearing, milking, or processing are classified as Class 8, which affects engineering requirements and the permit pathway.
  • Shearing sheds require wide clear spans and high internal clearances to accommodate the board, counting-out pens, and wool press, making Open Web Trusses the common structural solution.
  • Agricultural sheds classified as Class 7b or Class 8 will almost always require a building permit. The exemptions that apply to minor Class 10 structures don’t extend to production infrastructure, so early engagement with a registered building surveyor is the practical next step. 
  • Trusteel Fabrications builds agricultural sheds using Rectangular Hollow Section (RHS) structural steel as standard, with Universal Beams (UB) and Open Web Trusses (OWT) used where wider spans are required.

Agricultural Sheds vs Farm Sheds: Why the Distinction Matters

Agricultural sheds and farm sheds can look alike from the road, both are steel structures on rural land, but what they’re built to do, and what that demands structurally, are very different. 

Both are steel structures on rural land, but the design requirements, structural loads, and regulatory classifications differ significantly.

  • Storage versus production: A farm shed serves general storage, tractors, implements, hay, and equipment. An agricultural shed serves a commercial production operation.
  • Structural loads: An agricultural shed has to support grain pressure loads, livestock handling systems, or a working shearing board, demands a general storage shed was never engineered for.

Confusing the two categories leads to under-specified structures.

Grain Storage Sheds: Design and Specification Requirements

A grain shed does a very different structural job to an open-bay machinery shed. It has to hold back the sideways push of stored grain, not just keep the weather off equipment. 

Floor and wall construction: Sealed concrete floors, moisture-resistant wall construction, and airtight detailing for fumigation are all standard requirements.

Access: Openings need to accommodate front-end loaders and auger equipment.

Frame: RHS structural steel frames carry the wall and roof loads involved without the deflection risk that lighter C-section framing introduces under sustained grain pressure.

It is classified as Class 7b under the NCC, meaning it’s treated as a warehouse structure, with engineering and permit requirements to match. 

Livestock Facility Sheds: Cattle, Sheep and Dairy Applications

Keeping animals comfortable is the starting point for a livestock shed’s design, everything from wall type to clear span follows from that one requirement. 

Ventilation: Open-sided bays, louvred walls, and elevated eave heights are common design responses.

Internal clearance: Clearance must accommodate cattle crushes, races, and handling equipment without obstruction.

Dairy-specific requirements: Dairy facilities carry additional hygiene requirements beyond a standard livestock shed, including floor drainage and washdown provisions. 

Span: Wider clear spans are often needed to fit race systems and handling lanes without internal columns interrupting the workflow. For these spans, UB or OWT framing is used alongside or in place of RHS sections.

It’s the use of the structure, not just its size, that determines its NCC classification. 

Shearing Sheds: Span, Workflow and Structural Considerations

What happens inside a shearing shed on any given day, moving sheep through the board, counting them out, rolling and pressing wool, decides almost everything about how it needs to be built. 

Layout: The shed must fit the board, counting-out pens, wool rolling tables, a wool press, and a separate classing area in a single clear-span structure. That workflow drives a wider-than-average span and a higher ceiling height over the board.

Structure: Open Web Trusses achieve the clear span required without internal columns interrupting the work area.

Material: Steel is the practical choice over timber for a permanent production structure. It does not warp, does not require repainting, and carries a longer service life with lower maintenance costs.

A shearing shed is classified as Class 8 under the NCC because shearing is a production process carried out for commercial gain. 

NCC Classification for Agricultural Sheds in Victoria

Two classifications decide almost everything about how an agricultural shed gets engineered and approved under the National Construction Code: Class 7b and Class 8. 

  • Class 7b: Covers storage use, including grain storage.
  • Class 8: Covers production, processing, and assembly use, including shearing, milking, and packing.

Mixed use: A shed used for both storage and processing may carry mixed classification requirements.

Class 7b and Class 8 structures fall outside the exemptions available to minor Class 10 buildings, so an agricultural production shed of this kind will almost always require a building permit. Confirm the specific requirements for your project with a registered building surveyor early in the planning process. 

Victorian Planning and Permit Requirements for Agricultural Sheds

Even a shed that clears the building permit question isn’t necessarily in the clear. A planning permit is a separate approval, and it can still apply depending on your property’s zone and overlays. 

  • Zone and overlay check: Check your property’s zone and any overlays using VicPlan.
  • Bushfire overlays: Bushfire Attack Level (BAL) overlays affect material specifications and vent sizing on rural properties in fire-prone areas, including parts of the Mallee, the Wimmera, and Gippsland.
  • Permit management: Trusteel, as a registered Victorian Building Authority (VBA) builder, manages the permit process within the project, removing the need to engage a separate registered builder.

Steel Frame Specification: RHS, Universal Beams and Open Web Trusses

The frame is where the difference between a shed built to last decades and one built to a price becomes obvious, and for agricultural production structures, that difference starts with RHS. 

  • Standard frame: RHS is stronger and more durable than C-section framing, which is a lighter, lower-cost option used by many volume shed suppliers but not suited to production-grade agricultural structures.
  • Wider spans: For wider-span structures, including shearing sheds, livestock facilities, and large grain storage buildings, an engineer specifies UB or OWT framing where spans require it.
  • Where C-section fits: C-section frames work for light-duty storage.

For structures expected to perform across decades of commercial agricultural use, RHS, UB, or OWT framing is the correct specification. 

What Agricultural Shed Construction Includes with Trusteel

Design, permits, fabrication, concrete slab coordination, and on-site construction are all managed within a single Trusteel project, so there’s no separate builder, surveyor, or concretor for the operator to source or coordinate.

  • Full construction is available across Victoria.
  • Kit supply is available for operators outside Victoria.

What we see most often on agricultural projects is that operators underestimate the coordination involved when trades are managed separately. A single-contractor model removes that risk entirely.

Trusteel Fabrications has designed and built agricultural sheds across Victoria since 1976. To discuss your grain storage, livestock facility, or shearing shed project, talk to Trusteel about your agricultural shed.

Frequently Asked Questions

Do agricultural sheds in Victoria require a building permit?

Yes, in almost every case. Grain storage, livestock facilities, and shearing sheds are classified as Class 7b or Class 8 under the NCC, and those classifications fall outside the exemptions available to minor Class 10 buildings. A registered building surveyor can confirm the specific requirements for your project early in the planning stage. 

What is the difference between a Class 7b and a Class 8 agricultural shed under the NCC?

Class 7b is the storage classification, covering grain storage. Class 8 applies once a production or processing activity happens on-site, such as shearing or dairy milking. Because classification drives both the engineering standard and the permit pathway, a shed doing both jobs needs to be assessed against whichever classification, or combination, actually applies.

How does a shearing shed design differ from a standard farm shed?

A shearing shed needs to accommodate a working board, counting-out pens, a wool press, and a classing area within a single clear-span space, which drives a wider span and a higher ceiling than a general farm shed requires. Open Web Trusses are commonly used to achieve that clear span without internal columns disrupting the work area. 

Why does Trusteel use RHS steel frames rather than C-section framing for agricultural buildings?

RHS structural steel is stronger and more durable than C-section framing. C-section is lighter and lower in cost, but it isn’t suited to the structural loads and long operational lifespans expected of production infrastructure. For wider-span agricultural structures, Trusteel also specifies Universal Beams and Open Web Trusses where the span requires it. 

Does Trusteel manage council permits and construction, or do I need to organise those separately?

Trusteel manages design, permits, fabrication, and construction within a single project. As a registered VBA builder, Trusteel handles the permit application process directly, so operators don’t need to engage a separate registered builder, surveyor, or concretor to complete the project.