A small domestic shed installed in Melbourne starts from around $20,000. A full commercial warehouse at 18 metres and above starts past $120,000. That gap isn’t really about size on its own, it’s about whether the number in front of you is a kit price or a finished, permitted building, and Melbourne’s wind terrain, BAL zones, and council overlays decide which end of it you land on.
This guide covers price ranges by size and type, what actually separates a kit price from a finished build, and the frame, permit, and site factors that determine where your project lands in that range.
Key Takeaways
- Warehouse-scale construction in Melbourne depends on frame type, site classification, and Class 7 permit requirements as much as it depends on size.
- RHS structural steel is the standard for clear-span warehouse construction; for the widest spans, Universal Beam or Open Web Truss sections carry the load more efficiently than a single RHS portal frame.
- Melbourne council overlays vary by suburb, so a property in one municipality may need no planning permit while a neighbouring property requires full council approval.
- Supply-and-install shed and warehouse prices include engineering, permits, fabrication, and concrete, which kit prices do not.
Warehouse Planning in Melbourne: Site, Span, and Structure
Warehouse design in Victoria must meet BCA requirements for Class 7 buildings, since these aren’t optional design elements. That means accounting for:
- Fire separation distances
- Egress provision
- Structural load classifications
all part of delivering a secure, code-compliant structure.
For clear-span warehouses at 18 metres and above, RHS portal frames eliminate internal columns, which matters for storage layout and forklift access. Three additions are most cost-effective when integrated at the design stage rather than added later:
- Mezzanine floors
- Loading dock canopies
- Roller door sizing
Industrial zone setback requirements and minimum site dimensions vary by council, so confirming these controls before committing to a footprint avoids redesigns.
Kit Shed vs Custom-Built: What the Price Difference Actually Means
Kit and custom-built pricing look comparable at first glance, but they cover very different scopes.
| Kit Supply | Registered Builder (Supply-and-Install) | |
| What’s included | Steel components only | Design, permits, engineering, slab, and construction |
| Owner-builder obligation | Applies once project value exceeds $16,000 | Not applicable, the builder manages permits directly |
| Who carries the risk | The owner | The builder, through engineering sign-off and construction accountability |
Under the Domestic Building Contracts Act 1995, owner-builders on domestic projects valued over $16,000 require a permit from the Victorian Building Authority (VBA), and structures built without meeting this obligation carry compliance risk at resale and on insurance.
What Does a Shed or Warehouse Cost in Melbourne?
Supply-and-install prices reflect the full scope: engineering, permits, slab, fabrication, and construction. Kit prices cover steel components only.
The table below shows indicative Melbourne warehouse shed price ranges by size category.
| Size Category | Example Size | Kit Price Range | Supply-and-Install Range |
| Small domestic shed/garage | 3x3m to 6x6m | $2,000 to $6,000 | $20,000 to $28,000 |
| Mid-size workshop | 6x9m to 12x9m | $6,000 to $15,000 | $20,000 to $45,000 |
| Large rural or farm shed | 12x18m to 18x12m | $15,000 to $35,000 | $45,000 to $100,000 |
| Commercial warehouse | 18x24m and above | $35,000+ | $120,000+ |
Figures are indicative. Final price depends on frame type, site conditions, door specification, and permit requirements.
What Affects Shed Prices in Melbourne Beyond Size?
Five variables move shed prices beyond the base size calculation. Kit price guides do not address any of them.
- Terrain category and wind region: Site location determines the design wind speed. Higher terrain categories increase steel specification requirements, typically adding 5 to 15% to cost.
- Bushfire Attack Level (BAL) rating: Properties in Melbourne’s outer fringe and interface areas may fall under AS 3959-2018 construction requirements for bushfire-prone land. BAL-rated construction uses upgraded cladding and closures that add directly to price.
- Council planning overlays: Design and Development Overlays and Neighbourhood Character Overlays under the Victoria Planning Provisions can require full planning permits, adding $1,500 to $4,000 or more.
- Site preparation and slab: Excluded from all kit pricing. Costs vary by soil type, slope, and access.
- Door specification: Roller doors sized for vehicle clearance, motorised operation, and wind-rated installation vary significantly in cost. A standard roller door differs substantially in price from a high-clearance, cyclone-rated option for a warehouse.
Why Frame Type Changes the Price and the Building
Different frames lead to different prices. Rectangular Hollow Section (RHS) frames and C-section frames are not equivalent products.
| C-Section | RHS | |
| Weight | Lighter | Heavier |
| Cost | Lower | Higher |
| Span capability | Limited | Wider clear spans |
| Service life | 10 to 15 years typical | 30+ years |
| Typical use | Light-duty storage | Commercial, industrial, equine, farm |
C-section frames work for light-duty storage sheds. For warehouse spans of 18 metres and above, manufacturing facilities, and commercial buildings where structural load classifications apply under the Building Code of Australia (BCA), RHS is the appropriate standard.
Trusteel builds with RHS structural steel as the standard specification. For the widest warehouse spans, where a single RHS portal frame becomes less efficient across the unsupported bay, Trusteel specifies Universal Beam (UB) sections or Open Web Trusses (OWT), engineered for that specific span and load combination.
Permits for Sheds and Warehouses in Victoria
Class 10a domestic sheds may qualify as exempt development, but the general exemption under Schedule 3 of the Building Regulations 2018 is narrow: a floor area under 10 square metres and a height under 3 metres, subject to setback requirements. Most warehouse-scale structures exceed this threshold by a wide margin, so this exemption isn’t a realistic path for commercial or industrial construction.
Commercial and industrial sheds are classified as Class 7 or Class 8 under the BCA and require a building permit regardless of size. In Victoria, that permit must be lodged by a registered building surveyor, supported by engineer-certified drawings, not issued by council directly.
A registered builder under the VBA manages this process on the owner’s behalf, engaging the building surveyor and coordinating the engineering certification, so the owner doesn’t need to separately source and manage that relationship. Trusteel holds VBA registration and manages permit applications as part of every project scope.
Melbourne Council Variation: Why Your Location Affects Approval
Melbourne’s council-by-council variation is easy to underestimate. Design and Development Overlays, Neighbourhood Character Overlays, and Bushfire Management Overlays apply under each council’s own planning scheme, and they can prohibit or constrain shed placement, height, roof pitch, and cladding colour.
A property in one suburb might need no planning permit at all; a property in the adjoining suburb might require full council approval because of an overlay that applies only to that side of the boundary.
This isn’t a reason to worry, it’s a reason to confirm your property’s planning controls early. Search your address on VicPlan before committing to any design or supplier, since overlay status is determined by your specific site, not a general rule for your suburb.
How Trusteel Manages Shed and Warehouse Projects End-to-End
What Trusteel Delivers
A buyer who separately engages a building designer, a building surveyor, a concretor, and a shed supplier is managing four contractors with separate timelines and separate accountability. Trusteel covers design, permits, fabrication, site preparation, concreting, and construction under a single contract.
Full construction is available across Victoria. Self-erect kit supply is available interstate. Trusteel does not supply kits for Victorian projects where permit and construction obligations apply.
What the Customer Achieves
Your project moves from design approval to finished building without coordinating separate trades. Permit delays, slab scheduling, and steel delivery are managed within one scope.
What we see most often on commercial projects is that buyers who attempt to self-manage permits and concreters separately lose four to eight weeks before fabrication even starts, which is exactly the delay you avoid when you talk to Trusteel about your warehouse project from the outset.
Frequently Asked Questions
How much does it cost to build a warehouse in Melbourne?
Supply-and-install warehouse costs in Melbourne typically start from around $120,000 for an 18x24m clear-span structure and rise with span, height, and fit-out. These figures include engineering, permits, fabrication, and construction. Kit-only prices cover steel components alone and exclude slab, permits, and installation entirely.
What permits does a warehouse need in Victoria?
Warehouses are classified as Class 7 buildings under the National Construction Code and require a building permit regardless of size. A registered builder such as Trusteel manages the permit application directly, removing the need to engage a private building surveyor separately. Depending on your council and site, a planning permit may also apply.
Why does frame type matter for warehouse construction specifically?
Warehouse spans of 18 metres and above put load and clear-span demands on a frame that C-section steel isn’t built for. RHS structural steel is the standard for this scale of construction, and for the widest spans, Universal Beam or Open Web Truss sections carry the load more efficiently than a single RHS portal frame.
Does my warehouse’s location affect what approval I need?
Yes. Design and Development Overlays, Neighbourhood Character Overlays, and Bushfire Management Overlays apply under each Melbourne council’s own planning scheme. A warehouse site in one suburb might need no planning permit at all, while a site in the adjoining suburb might require full council approval. Check your specific address on VicPlan before committing to a design.
Can a warehouse be supplied as a kit, or does it need to be custom-built?
Kit supply is possible for smaller structures, but warehouse-scale builds involve engineering certification, Class 7 permit compliance, and slab design that a standard kit doesn’t include. A custom-built warehouse from a registered builder covers design, permits, fabrication, and construction as one accountable process, which matters more at this scale than it does for a small shed.