Choosing a steel garage involves more than picking a size. The roof style, structural frame, building classification, and permit requirements all shift depending on how you intend to use the structure and where your property sits, and getting each of those decisions right is exactly what Trusteel has been doing for Melbourne and regional Victoria property owners since 1976.
The right starting point is understanding which garage type actually fits your situation, what a full Trusteel build includes, and where Victorian permit rules apply differently for domestic and commercial structures.
Key Takeaways
- A domestic steel garage in Victoria typically requires a building permit unless it meets specific exemption criteria under the Building Regulations 2018 (Vic), including floor area, setback, and bushfire zone conditions.
- Trusteel builds with Rectangular Hollow Section (RHS) structural steel as standard, which costs more than C-section framing but delivers a longer service life and higher load capacity.
- A garaport combines an enclosed garage bay with an attached open carport section. Each element may be assessed differently under Victorian building regulations.
- Full construction is available across Victoria. Customers outside Victoria receive kit supply only.
What Types of Steel Garages Does Trusteel Build?
Not every garage on this list solves the same problem, and that’s deliberate. Trusteel builds five main categories, and the right one for you depends on your site, your vehicles, and how you plan to use the structure.
- Domestic gable garages: suit single or double-vehicle storage and workshop use on residential properties.
- Domestic skillion garages: work well on tight sites or contemporary homes where a lower roof profile is an asset.
- Commercial garages: handle heavier loads, fleet storage, and commercial vehicle access.
- Garaports: combine an enclosed bay with an open covered section under one roof.
- Custom and specialised builds: cover structures that fall outside standard configurations, from aircraft hangars to garages with integrated offices.
Domestic Gable Garages
A gable roof is symmetrical, with two pitches meeting at a central ridge. This gives the structure more internal height at the centre, which suits workshop use and taller vehicles.
Gable roofs also distribute water runoff to both sides of the building, which is useful where drainage on one side is restricted. Visually, a gable profile tends to complement existing dwellings with traditional roof lines.
Underneath that roof form, the frame is what actually determines how long the garage lasts. Trusteel builds domestic gable garages with RHS structural steel as standard, rather than the C-section framing common in volume shed supply. RHS is heavier and more durable, a distinction that matters for a structure expected to last 30 or more years. See the full domestic garage range for configurations and dimensions.
Domestic Skillion Garages
A skillion isn’t a lower-quality choice. It’s simply the better fit for a different kind of site. It has a roof with just one pitch, running in a single direction. It sits lower than a gable roof, which makes it a good fit for lean-to additions, tight urban blocks, and contemporary homes.
There’s one thing worth knowing: a skillion sends all its roof runoff to one side. Before you commit to this style, check that the low side of your property can handle that concentrated water flow. On a tight site, this can even decide which way the roof should pitch.
Commercial Garages
A commercial steel garage isn’t just a bigger domestic one, it’s a different structure altogether, in both specification and classification. Three things set it apart: the loads it needs to carry, the NCC classification that applies, and the structural system used to achieve it.
- Heavier loads: Car hoists, commercial vehicles, fleet storage, and workshop equipment all place demands that a standard domestic frame isn’t designed to meet.
- NCC classification: Under the National Construction Code, a car park structure is Class 7a, while a storage-focused commercial garage is typically Class 7b. Classification is determined by use, not just size, and affects both structural requirements and the permit pathway. Trusteel’s Victorian Building Authority (VBA) registration covers commercial builds.
- Structural system: For wider spans, commercial bays, or structures carrying significant point loads, the structural system moves beyond RHS alone, with Universal Beams (UB) or Open Web Trusses specified where the span and load demand it. The right framing system is determined at the design stage, not selected from a standard list.
Garaports: Part Garage, Part Carport
Not every vehicle on a property needs the same level of protection, and a garaport is built around that fact. It’s an enclosed garage bay combined with an attached open carports section under a shared or continuous roof, suited to properties where one vehicle needs full enclosure and another just needs covered parking.
The open section of a garaport functions like a carport, and under the Building Regulations 2018 (Vic), the open and enclosed sections may be assessed differently for permit purposes. It’s worth confirming with your council how the combined structure is classified before lodging any application.
For a full breakdown of this configuration, visit the garaport page.
Custom and Specialised Garage Builds
Standard configurations don’t cover every property, and that’s exactly what a custom garage is for: a structure designed to your specific site, use case, or dimension requirement. Examples include aircraft hangars, oversized commercial bays, mezzanine-level storage, and garages with integrated amenity or office space.
When a garage incorporates office or workplace use, the NCC classification shifts: a structure used primarily as a workplace is Class 5, not Class 10a, which changes both the permit pathway and structural requirements. Trusteel manages this assessment as part of the design process.
A custom garage uses the same in-house fabrication and VBA-registered construction process as any standard build. The specification is more complex, but the delivery pathway stays the same.
At a Glance
| Best Suited To | Roof Style | Worth Knowing | |
| Domestic Gable | Single or double-vehicle storage, workshop use | Symmetrical, higher centre height | Higher internal clearance suits taller vehicles |
| Domestic Skillion | Tight sites, lean-to additions, contemporary homes | Single pitch, lower profile | All roof runoff goes to one side |
| Commercial | Fleet storage, car hoists, commercial vehicles | Varies with span | Classified as Class 7a (car park) or Class 7b (storage) depending on use |
| Garaport | One vehicle needing full enclosure, one needing covered parking only | Shared or continuous roof | Open and enclosed sections may be assessed separately for permits |
| Custom/Special | Non-standard sites or uses: hangars, offices, mezzanines | Varies by project | Classification shifts to Class 5 if the space is used as a workplace |
Full Build or Kit Supply: What’s the Difference?
Where you’re located determines which of these two paths applies, and it’s worth understanding both before assuming you know which one you’ll get.
- Full build: covers design, permits, fabrication, concrete slab, and construction, all managed by Trusteel. The customer has one point of contact and one accountable party, with no separate contractor coordination required.
- Kit supply: available for customers outside Victoria. Trusteel fabricates and delivers the steel structure, with erection left to the customer.
Full construction is available across Melbourne and regional Victoria. Customers in other states receive kit supply only.
Do You Need a Permit for a Steel Garage in Victoria?
Most domestic garages in Victoria require a building permit under the Building Regulations 2018 (Vic) unless the structure meets specific exemption criteria in Schedule 3. Those criteria include floor area, storey height, setback from boundaries, and whether the land is in a bushfire-prone area.
A structure may fall under the exemption threshold in size but still require a permit if it sits in a Bushfire Attack Level (BAL) zone, carries a heritage overlay, or is subject to a council-specific planning condition. Exemptions are not automatic. Each trigger must be checked against your property’s actual conditions.
Use VicPlan to check your property’s planning zone and any overlays before assuming an exemption applies.
With a full Trusteel build, permit management is included as standard. Trusteel’s VBA registration is what makes this possible, so the customer never needs to separately engage a registered builder.
How Much Does a Steel Garage Cost in Melbourne?
No two steel garage projects cost the same, and several variables determine the final figure.
- Frame specification: RHS structural steel costs more upfront than C-section framing, but it’s heavier, longer-lasting, and carries higher loads. C-section still suits light-duty structures, and for a garage expected to perform for decades, the RHS cost difference is a reasonable trade-off.
- Size and roof style: A larger footprint and a gable roof both add to the structural material requirement compared to a smaller skillion configuration.
- Site conditions: Slab complexity, access constraints, and ground conditions all affect concreting and construction costs.
- Permits: Permit fees vary by council and project classification.
Use the Shed Designer to configure a size and get a preliminary estimate. For a site-specific assessment, a quote conversation is the right next step.
How Trusteel Designs and Builds Steel Garages Across Victoria
In-House Design and Fabrication
Trusteel handles design, fabrication, and construction entirely in-house, with no subcontracted fabricators involved in the structural work, which gives the team direct control over specification and quality from the initial design through to installation.
The structural system for each garage, whether RHS for standard domestic spans or Universal Beams for wider commercial bays, is selected at the design stage based on that project’s actual load and span requirements.
What the Customer Receives
On a full Trusteel build, the customer receives a permitted, constructed garage complete with a concrete slab, while permit applications, council liaison, and construction scheduling are all managed by Trusteel. The customer’s role is simply to confirm the design, approve the scope, and take delivery of the finished structure.
For customers outside Victoria, the kit supply pathway delivers fabricated steel ready for erection. Design and fabrication quality stay the same, only the on-site construction responsibility shifts to the customer.
If you’re ready to move forward, get a quote for your steel garage in Melbourne or regional Victoria and talk through what your project actually needs.
Frequently Asked Questions
Does a steel garage in Melbourne always need a building permit?
Not always, but most steel garages in Melbourne do need one. The Building Regulations 2018 (Vic) include exempt building work provisions, and a small domestic garage may qualify if it meets criteria around size, setbacks, and location. That said, a bushfire-prone area, a heritage overlay, or a council-specific condition can trigger a permit regardless of size, so check your property’s overlays on VicPlan before assuming an exemption applies.
What is the difference between a garaport and a carport, and which do I need?
A garaport includes at least one fully enclosed bay combined with an attached open covered section, while a carport is open-sided with no enclosed bay at all. If you need one vehicle fully enclosed and another simply covered, a garaport is the right configuration. If no enclosure is required at all, a carport is the simpler and typically lower-cost solution.
How long does it take Trusteel to design, permit, and build a steel garage in Victoria?
Timeline depends on project complexity, council permit processing times, and current fabrication scheduling. Permit approval alone can take several weeks, depending on the council and whether additional information is requested, and Trusteel manages that process as part of a full build, removing the coordination task from the customer entirely.
Why does Trusteel use RHS framing when most shed suppliers use C-section frames?
RHS structural steel is stronger and more durable than C-section, which is lighter and cheaper and suits volume shed supply where price is the primary driver. For a garage expected to carry real loads and last several decades, RHS is the better long-term investment, and the cost difference is real: it reflects a genuine difference in material quality and service life.
Can Trusteel build a garage that includes a workshop, office, or amenity room?
Yes, custom garage builds can incorporate workshop space, office areas, or integrated amenities. When a garage includes office or workplace use, the NCC building classification shifts to Class 5, which changes both the permit pathway and structural requirements, and Trusteel’s design process accounts for this at the outset rather than as an afterthought.