A commercial or industrial shed is not a backyard garage scaled up. The structural requirements, permit obligations, and site preparation costs are in a different category entirely, and the price you see advertised on a kit shed website is rarely the price you pay to have a compliant, operational structure in the ground.
Trusteel Fabrications has been designing, fabricating, and constructing steel buildings across Victoria since 1976. What follows is a practical guide to what a commercial or industrial shed actually involves in Melbourne, from frame type and span width to permits, site costs, and realistic pricing.
Key Takeaways
- Kit shed prices starting from $14,000 to $39,000 typically cover supply only. Concrete, permits, engineering, and construction are additional costs that often exceed the kit price on commercial projects.
- Rectangular Hollow Section (RHS) structural steel frames are stronger and span wider clear distances than C-section frames, which matters directly for commercial and industrial applications where floor space and load capacity are critical.
- Commercial and industrial sheds in Victoria fall under BCA Class 7b or Class 8 classifications, each carrying distinct engineering and fire separation requirements.
- A building permit is required for almost all commercial shed construction in Victoria. A separate planning permit may also be required depending on your zone and any applicable overlays.
Commercial vs Industrial: What the Difference Means for Your Build
A commercial shed usually means storage, warehousing, or distribution space. An industrial shed usually means a building where an active process happens, such as manufacturing, assembly, or repair work. The National Construction Code doesn’t use either term. Instead, it classifies the first as Class 7b and the second as Class 8.
| Class | Definition |
| Class 7b (commercial) | Storage, or the display of goods or produce for sale by wholesale, such as a warehouse or bulk storage facility |
| Class 8 (industrial) | A building where production, assembling, altering, repairing, packing, finishing, or cleaning of goods takes place, such as a factory or workshop |
The distinction matters beyond labelling. An active production process, whether that’s machinery, materials handling, or handicraft work, introduces ignition sources and fire load that pure storage doesn’t. Because of this, Class 8 buildings are generally treated as carrying greater fire hazard than Class 7b, and a factory or workshop project tends to face closer scrutiny on fire separation and construction type than a warehouse of the same size.
Structural load requirements follow from your actual use, not the classification label. A commercial (Class 7b) building may need higher floor load capacity for stacked goods or pallet racking. An industrial (Class 8) workshop’s structural design responds instead to machinery weight and operational loads. Either way, knowing which category you fall into, and what you’ll actually be doing inside the shed, is the first step before any design work begins.
Either way, knowing which category you fall into, and what you’ll actually be doing inside the shed, is the first step before any design work begins.
How Span Width Affects What You Can Do With the Space
Span width determines whether your shed can function the way you intend.
| Span Width | Suits |
| 9m to 12m | Workshops and trade storage |
| 15m to 24m | Vehicle servicing, light manufacturing, and distribution |
| 24m and above | Warehousing and heavy equipment operations |
Wider spans put pressure on the frame in a way smaller spans don’t. C-section portal frames become structurally inefficient here, which is why they need internal columns to stay standing at these widths.
Those columns aren’t just a structural detail: they break up racking runs, block forklift paths, and limit how a warehouse floor can actually be laid out. RHS structural frames avoid that trade-off, since they achieve the same wide clear spans without internal columns, which is why they’re the standard for commercial and industrial builds.
RHS Frames vs C-Section: Why the Frame Type Changes the Whole Building
Rectangular Hollow Section steel is a closed-profile structural member. It is stronger, stiffer, and more resistant to torsional load than C-section (also called C-purlin) framing, which uses an open-profile channel section and dominates the kit shed market.
| RHS Frames | C-Section Frames | |
| Typical application | Commercial, industrial, equine | Light domestic storage |
| Clear span capability | Wide spans, no internal columns | Limited without additional support |
| Structural rigidity | High | Moderate |
| Serviceable life | 30+ years | 10 to 15 years typically |
| Cost | Higher upfront | Lower upfront |
C-section frames work for light-duty storage. For commercial and industrial uses where the shed must perform for decades and carry real operational loads, RHS structural steel is the standard Trusteel specification. For large industrial sheds at 24m and above, where a single RHS portal frame becomes less efficient across the unsupported bay, Trusteel specifies universal beams or Open Web Trusses instead, engineered to the actual span.
What a Commercial Shed Costs in Melbourne: Indicative Price Ranges
The prices below reflect fully installed, permitted, and site-prepped structures. They are not kit prices.
- Small workshop or trade shed (9m x 12m to 12m x 18m): from $90,000 installed, depending on specification
- Medium industrial shed (15m x 24m to 18m x 30m): from $180,000 to $380,000 installed
- Large industrial shed (24m x 36m and above): from $400,000 upward, depending on span, height, and fit-out
Kit supply prices advertised from $14,000 to $39,000 exclude concrete slabs, site preparation, permits, and construction labour. In Melbourne, slab costs alone typically add $80 to $150 per square metre, depending on soil classification under AS 2870. Permits and engineering certification add further cost.
Trusteel provides fixed-price quotes after a site and design consultation.
What Triggers a Planning Permit vs a Building Permit in Victoria
A building permit is issued by a registered building surveyor under the Building Act 1993 (Vic) and is required for virtually all commercial shed construction. This is separate from a planning permit.
A planning permit is governed by the Planning and Environment Act 1987 (Vic) and is triggered by your property’s zone and any overlays. Industrial zones (IN1Z, IN3Z) in Melbourne generally allow commercial and industrial development below certain thresholds without a planning permit, but conditions on setbacks and floor area vary by zone schedule. Check your specific address via planning.vic.gov.au.
Trusteel’s Victorian Building Authority (VBA) registration means the building permit process is managed directly. Planning permit advice for complex or overlaid sites may require a town planner.
Wind Loads, BAL Zones, and Victorian Site Classification
Melbourne metro sits in Wind Region A under AS/NZS 1170.2, the Australian Standard for wind actions, which sets the structural loading requirements for your shed. Properties in bushfire-prone areas carry a Bushfire Attack Level (BAL) rating that changes cladding and structural specifications.
Soil classification under AS 2870 also affects slab design. A shed engineered for one Melbourne site cannot be transferred to another without re-engineering. Trusteel designs each structure to its specific site conditions.
Common Configurations for Melbourne Commercial and Industrial Sheds
Most Melbourne commercial and industrial sheds fall into a handful of standard configurations, each suited to different operational needs.
- Single-span gable frame workshops: one open bay covers the full footprint, suited to trade, vehicle servicing, and light manufacturing
- Multi-bay industrial sheds with roller doors: separate storage, workshop, and loading zones within one structure
- Attached lean-to storage bays: extend an existing shed’s footprint for additional storage without a full second structure
- Mezzanine floors or internal office partitions: add administrative space, staff amenities, or elevated storage without expanding the building’s footprint
- Large industrial shed formats: wider clear spans suited to warehousing and logistics operations that need uninterrupted floor area for racking or vehicle movement
Roller door sizing is a practical decision buyers often miss at the planning stage. A door sized for a standard van won’t clear a forklift with a raised load, so daily forklift access needs enough clearance for the vehicle’s mast height, not just its cab height. Getting this wrong after construction means retrofitting an opening, which costs far more than specifying it correctly upfront.
How Trusteel Manages Commercial Shed Construction End to End
What Trusteel Manages
Design consultation, structural engineering, permit application, in-house fabrication, concrete slab, and full construction are all handled by Trusteel. Customers do not coordinate separate contractors. All steel fabrication is done in Melbourne, which reduces lead time risk and keeps quality control direct.
Trusteel’s VBA registration means no separate registered builder is needed to satisfy Victorian construction law. That removes one of the most common sources of project delay on commercial builds.
What You Get at the End
A fully compliant, permit-approved commercial or industrial shed, built to your site’s engineering requirements, with a single point of contact across the entire project.
If you want to know what a commercial or industrial shed would cost for your site, and what permits your council requires, talk to a commercial shed builder.
Frequently Asked Questions
Do I need a planning permit to build a commercial shed in Melbourne?
Not always, but it depends on your property’s zone and overlays. Industrial zones in Melbourne often allow commercial shed construction below certain thresholds without a planning permit. Check your specific address through planning.vic.gov.au before assuming you are exempt.
What is the difference between a Class 7 and a Class 8 shed under the NCC?
Class 7b covers warehouses and storage buildings. Class 8 covers factories, workshops, and production facilities. The classification determines fire separation requirements and the structural engineering standard your building surveyor must certify against.
Why does Trusteel use RHS frames instead of C-section frames, and does it cost more?
RHS structural steel is stronger, stiffer, and spans wider clear distances than C-section framing. It costs more upfront. For commercial and industrial applications where structural capacity and serviceable life matter, the additional cost is appropriate.
What is included in Trusteel’s price, and what costs should I budget for separately?
Trusteel’s fixed-price quote covers design, engineering, permits, fabrication, concrete slab, and construction. Costs that vary separately include site preparation, power connections, roller doors upgrades, and any internal fit-out beyond the building shell.
Does Trusteel manage the building permit, or do I need to arrange that myself?
Trusteel manages the building permit process directly as a registered VBA builder. You do not need to engage a separate registered builder. For sites requiring a planning permit, Trusteel can advise whether a town planner is needed for your specific situation.