A skillion carport looks simple. Getting the design, size, and structure right takes more consideration than most buyers expect.

Trusteel Fabrications designs, fabricates, and installs skillion flat roof carports across Victoria. Every skillion carport Trusteel builds is designed to the site, the vehicles, and the council’s requirements, not cut from a standard catalogue. 

To discuss sizing and configuration for your property, request a quote.

Skillion Roof vs Flat Roof: What Is the Difference?

The two terms are used interchangeably by most buyers and much of the industry. In practice, a skillion roof carries a minimum pitch, typically 2 to 3 degrees, required under AS 1562.1 for steel sheet cladding to drain correctly and maintain product warranty validity.

A genuinely flat roof carport would fail drainage requirements and, in most cases, building inspection. The low pitch of a skillion roof carport achieves the clean, contemporary look of a flat roof without the compliance problems.

When Trusteel designs a skillion flat roof carport, the pitch is engineered into the structure. The result looks flat from the street. It drains correctly and meets the standard.

Standard Sizes: Single and Double Carport Options

Standard single carports run around 3.0m wide by 5.4m to 6.0m deep. A double carport typically starts at 5.4m to 6.0m wide. Trusteel designs skillion carports up to 9.0m wide for wider vehicles or multi-bay configurations.

Vehicle type matters when sizing. A dual-cab ute needs more lateral clearance than a standard sedan. A caravan requires additional height and depth. An SUV with roof racks needs careful clearance assessment at the entry point.

These figures are design reference points, not binding specifications. Your site dimensions, vehicle requirements, and council setbacks will determine the final design. 

To get an indicative cost based on your dimensions and roof style, use our free Shed Designer to work through the basics, or request a quote for a scope-based estimate.

Freestanding or Attached: Choosing the Right Configuration

A skillion roof carport can be built freestanding or semi-attached to an existing structure. Each configuration suits different site conditions.

An attached carport integrates with the roofline of the house. It requires flashings and waterproofing at the junction, and the existing building’s structure must be assessed before installation. A freestanding structure sits independently. It offers more flexibility in placement and does not affect the existing building’s structural loading.

Neither configuration is universally better. The right choice depends on your property layout, available setback, and council requirements.

Materials and Finish Options

Trusteel skillion carports are available in Colorbond steel and Zincalume. Colorbond is the standard choice where street appeal matters. It is available in a range of colours and carries a product warranty for painted steel sheeting. Zincalume is unpainted zinc-coated steel. It performs well in exposed or rural settings and is a cost-effective option where colour is not a priority.

Both finishes are available with gutters and downpipes included in Trusteel’s standard build.

The structural frames are where Trusteel’s carports differ from a standard DIY carport kit. Trusteel builds with Rectangular Hollow Section (RHS) structural steel, not C-section framing. C-section is lighter and lower in cost. RHS is heavier, stronger, and better suited to wider spans, heavier loads, and longer service life. 

For a double carport, a wide-span design, or a structure sheltering a caravan or machinery, RHS framing is the right choice. An engineer certifies every Trusteel structure, which is a requirement for permitted works under the Victorian Building Authority (VBA).

Building Permits for Skillion Carports in Victoria

In Victoria, carports are assessed as Class 10a structures under the National Construction Code. Exempt development provisions exist, but they are conditional on setbacks, total floor area, and site-specific overlays.

A carport that appears to qualify for exemption may still require a permit if the property sits within a heritage overlay, a bushfire-prone area, or a flood zone. Most Victorian councils apply different rules based on zone and overlay. Check with your local council, or let Trusteel manage the assessment.

Trusteel prepares and lodges the relevant permit documentation on your behalf. You do not need to engage a separate building surveyor or registered builder.

Footing and Slab Considerations

A DIY carport kit price covers the steel frame and sheeting only. Post footings must be specified to the site’s soil classification under AS 2870 and wind region under AS 1170.2.

In reactive clay soils, which are common across Melbourne’s outer suburbs and regional Victoria, an undersized footing creates a structural risk and an insurance liability. The shed may move, the frame may rack, and warranty coverage may be void.

Trusteel manages concrete and footing work as part of the full installation service. When you compare a kit price to a Trusteel installed price, the kit price excludes this work entirely.

Contact the Trusteel team with your questions and site requirements, and we’ll return with your custom solution.

Frequently Asked Questions

Do I need a building permit for a skillion carport in Victoria?

In Victoria, most carports require a building permit unless they qualify for exempt development under the Building Regulations 2018. Exemption conditions include setback distances, total floor area, and the absence of heritage or bushfire overlays on the property. A carport that meets the basic size thresholds may still require a permit if the site carries an overlay. Trusteel assesses permit requirements as part of the design process.

What is the difference between a skillion roof and a flat roof carport?

A skillion roof carries a minimum pitch, typically 2 to 3 degrees, required under AS 1562.1 for steel sheet roof cladding to drain correctly and maintain warranty validity. A genuinely flat roof on a steel structure would fail drainage requirements and building inspection. Trusteel’s skillion flat roof carports carry a compliant pitch that achieves a flat appearance from street level.

How wide can a skillion carport be, and what size do I need for a dual-cab ute or caravan?

Trusteel designs skillion carports up to 9.0m wide. A standard single carport suits most sedans at around 3.0m wide. A dual-cab ute or a vehicle with roof racks requires more clearance, and a caravan typically needs additional depth and height. Your specific vehicles and property dimensions determine the right configuration, and Trusteel sizes each carport to those requirements.

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

Rectangular Hollow Section (RHS) steel is stronger and heavier than C-section framing, which is the standard used in most DIY carport kits. C-section suits light-duty, small-span structures. RHS carries higher load ratings, spans wider distances, and provides a longer service life, particularly for double carports and structures sheltering heavy or tall vehicles. Every Trusteel carport is engineer-certified to confirm the frame meets the requirements for the specific span and wind region.

Does Trusteel handle the concreting and footings, or do I need to organise that separately?

Trusteel manages concrete and footing work as part of the full installation service. You do not need to engage a separate concretor or builder. Footings are specified to your site’s soil classification under AS 2870 and wind region under AS 1170.2. This is work that a DIY carport kit price excludes entirely, which is an important difference when comparing installed and kit pricing.