Building Classes for Sheds: What Class Is Your Project and Why It Matters
Author: William Trewarn
One thing that catches a lot of people off guard early in a shed project is building classification.
From the outside, two sheds might look almost identical.
But depending on how the building is actually used, the approval pathway, engineering requirements, compliance obligations, and overall project costs can be completely different.
That’s why building classification matters much earlier than most people realise, often before engineering begins, approvals are submitted, or a shed is ordered.
In many projects, getting this wrong early can create delays, redesign costs, approval issues, or compliance problems later on.
The good news is that the process itself is usually quite straightforward once the intended use of the building is properly defined.
Quick Answer
Typically, smaller farm sheds and general-purpose storage buildings under 500m² are often classified as Class 10a structures, as they are generally considered non-habitable buildings used for storage or similar purposes under the National Construction Code (NCC).
However, building classification is determined by how the building is used, not simply what the building looks like.
If the use changes, the classification can change as well.
That change can significantly affect the project early in planning, particularly before council submissions, engineering documentation, and approvals begin.
Including:
- Structural engineering requirements
- Fire safety provisions
- Approval pathways
- Compliance obligations
- Construction costs
What Are Building Classes?
In Australia, buildings are classified under the National Construction Code (NCC).
The NCC groups buildings into classifications based on:
- Use
- Occupancy
- Risk level
- Operational purpose
These classifications help determine the standards a building must comply with.
That includes requirements relating to:
- Structural performance
- Fire safety
- Access provisions
- Energy efficiency
- Approvals and certification
In simple terms, different building uses carry different risks, so they require different standards.
What Class Is a Shed?
Class 10a: Common for Smaller Storage Sheds
Many smaller residential, rural, and farm storage sheds are classified as Class 10a buildings.
This classification generally applies to non-habitable buildings used for storage or similar purposes, particularly where the building is not regularly occupied as a workplace or used for commercial production activities.
Typical examples may include:
- Small machinery sheds
- Personal storage sheds
- Hay sheds
- General rural storage buildings
However, building classification is determined by how the structure is actually used, not simply what it looks like.
As projects become larger, more operationally complex, or regularly occupied by staff, the classification can change significantly.
At TechSpan, many of the industrial, agricultural, and operational buildings we work on are often classified as Class 7b or Class 8 buildings due to their scale, use, workflow requirements, or commercial activities.
That’s why understanding intended building use early is important, as classification impacts compliance pathways, engineering requirements, approvals, and overall project planning.
When a Shed Is Not Class 10a
A common misconception is that all sheds automatically fall under Class 10a.
That’s not always the case.
Once the use of the building changes, the classification may change too.
We often see this happen when a machinery shed later becomes a repair workshop or fabrication space. The structure may look the same externally, but the compliance pathway can change significantly.
Class 7b: Commercial Storage or Warehousing
A building may be classified as Class 7b when it is used for:
- Commercial storage
Examples include:
- Warehouses
- Distribution facilities
- Commercial storage buildings
- Freight or logistics storage
- Large Hay Sheds
- Large Machinery Storage Shed
Even if the structure physically looks like a standard shed, the operational use changes the compliance requirements.
Class 8: Workshops and Processing Facilities
A building may fall under Class 8 if it is used for:
- Repair work
- Production activities
This often applies when:
- Machinery is regularly operated inside the building
- Staff work in the space full-time
- Production processes are carried out on site
Examples include:
- Mechanical workshops
- Fabrication sheds
- Processing facilities
- Industrial production spaces
These buildings often require additional considerations around fire safety, ventilation, occupancy, and engineering performance.
Mixed-Use Buildings
Some projects involve multiple classifications within the same structure.
For example:
| Area | Likely Classification |
| General storage area | Class 7b |
| Workshop or fabrication area | Class 8 |
| Office or amenities area | Class 5 or Class 6 |
However, this does not automatically mean every building contains multiple classifications.
In many industrial and agricultural projects, smaller office or amenities areas may remain ancillary to the primary building use. Multiple classifications typically become more relevant when office, administration, retail, or occupied areas increase beyond certain proportions of the building or require separate compliance pathways.
Where different classifications exist within the same structure, fire separation requirements between areas may also apply depending on the NCC requirements and intended building use.
This is why intended workflow, occupancy, and operational use should be considered early during planning and design.
Why Building Classification Matters
Approvals and Certification
Your building classification directly affects the approval pathway.
This can influence:
- Whether the project qualifies for a Complying Development Certificate (CDC) or requires a Development Application (DA)
- The level of documentation required
- Engineering requirements
- How the certifier assesses the project
Incorrect classification early in the planning stage can create delays, redesign work, approval complications, or additional engineering costs later in the project.
Structural Design and Engineering
Different classifications require different design considerations.
Depending on the building class, projects may require additional:
- Fire safety measures
- Structural provisions
- Ventilation considerations
- Accessibility requirements
- Compliance documentation
This influences how the building is engineered from the very beginning.
Overall Project Cost
Classification can also significantly affect project costs.
As compliance requirements increase, so does overall project complexity.
Moving from a Class 10a building to a Class 7b or Class 8 project may impact:
- Structural design requirements
- Fire compliance
- Documentation scope
- Certification requirements
- Construction methodology
Two sheds that appear similar externally can have very different project costs once compliance obligations are applied.
Where Projects Commonly Go Wrong
Most problems happen when assumptions are made during early planning before the building use, approvals pathway, and compliance requirements are properly clarified.
Common examples include:
- Designing a shed as Class 10a before confirming actual operational use
- Changing the intended use midway through approvals
- Trying to fit a commercial operation into the wrong classification
- Not consulting a certifier early enough
These situations often lead to redesign, approval delays, additional engineering, and unnecessary costs.
On most projects, being clear about the use and intended outcomes early on prevents nasty surprises and unexpected cost blow-outs when it comes time to meet compliance.
A Practical Approach to Shed Planning
At TechSpan, we often encourage owner-led projects to approach planning in three stages:
Concept
Define how the building will actually be used now and into the future.
Configure
Confirm the building classification early and align the design, engineering, and approvals pathway accordingly.
Construct
Move into fabrication and construction with confidence knowing the project has been planned around the correct requirements from the start.
This process helps reduce uncertainty and avoid preventable project issues later on.
Building classification is one of the earliest and most important decisions in any shed project, ideally resolved before design documentation, approvals, and structural engineering are fully underway.
Getting it right early helps:
- Keep approvals moving
- Reduce redesign risk
- Improve compliance clarity
- Avoid unexpected project costs
- Ensure the building performs the way it needs to long term
In many cases, a short conversation early in the planning phase can save significant time and cost later.
Talk to the TechSpan Team
If you’re planning a machinery shed, workshop, warehouse, processing facility, or mixed-use building and you’re unsure how the project should be classified, the TechSpan team can help guide the early planning process.
The earlier classification is clarified, the easier it becomes to align approvals, engineering, and construction outcomes. Let’s chat.