Design the ultimate double garage with shed designer.
Design a custom double garage online. 6x6m and up, BlueScope steel, ShedSafe accredited dealers, AS/NZS engineered. Free quotes from local builders.
Why choose Double Garages?
Australian BlueScope Steel
100% Australian-made steel in every building
ShedSafe Accredited
Only quotes from verified, accredited dealers
Fully Customisable
Change every dimension to suit your needs
Design Templates
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What is a custom double garage?
A custom double garage is a steel-framed two-bay residential garage designed around the cars, utes and gear you actually own. Most are clad in Colorbond® and built from 100% Australian-made BlueScope steel, engineered to AS/NZS 1170.2 wind loading for your region. Unlike a kit garage with three preset sizes, a custom double flexes on width, length, eave height and door type, so the build fits the block and the way you use the space.
ShedDesigner's double garage templates start at 6 by 6 metres internal and step up to 7.5 by 7 metres for ute owners and storage builds. Pick the closest template, customise the dimensions, and submit your design once for free comparable quotes from ShedSafe accredited dealers in your region.
How big does a double garage actually need to be?
The Australian Standard for off-street parking, AS/NZS 2890.1:2004, sets the minimum residential parking bay at 2.4 metres wide by 5.4 metres long (Standards Australia, AS/NZS 2890.1:2004 Parking facilities). Two bays side by side need a bare-minimum internal width of about 5.1 metres once a centre clearance is added. A 6 by 6 metre garage gives you roughly 450mm of buffer per side, which is why 6 by 6 is the practical floor and not the ceiling.
Step the build up if any of this applies:
- Two dual-cab utes (Ranger, HiLux, D-Max, Triton). Modern dual cabs run around 1.95m wide and 5.4m long. Step to 6.5 by 6.5 metres so doors can open without scraping mirrors.
- A workshop bench at the back. A 600mm bench needs 6 metres of internal length minimum. A proper 1m workshop zone with shelving needs 6.5 to 7 metres.
- A 4WD with roof racks. Step the eave height from the standard 2.4 metres to 2.7 metres.
- A caravan or trailer beside the cars. Triple garage territory. See the garages category for triple and workshop options.
Doors, eaves and the headroom that matters
Door choice is the spec most buyers underweight.
Roller doors are the residential default. Standard sizing is 2.1 metres high by 2.4 metres wide for a single bay, or 2.1m by 4.8m for one wide opening (B&D, Garage door sizing). Allow 450mm of headroom above the daylight opening for the roller drum.
Two singles vs one double. Two single doors with a centre column give you a stronger structure, better security and the option to leave one bay closed in wind. One wide double gives clear unobstructed entry for boats, trailers and angled parking. Most Australian buyers go with two singles for daily-driver garages and one wide double for caravan or boat builds.
Eave height. 2.4 metres is the standard residential eave. Bump to 2.7 metres for workshops, mezzanines or tall vehicles. 3.0 metres is the floor for dual-cab utes with roof racks and ladder racks.
Before you get quotes
A garage stays bolted to your title for 30 years. The build needs to outlast the cars sitting in it.
100% Australian-made BlueScope steel. Across structural framing and Colorbond® cladding. BlueScope's COLORBOND® steel cladding for sheds and garages carries a warranty of up to 15 years against corrosion to perforation, with the exact period set by location and application (BlueScope, Garages & Sheds Warranty). Check your build on BlueScope's online warranty estimator. Sites within 1 kilometre of breaking surf are assessed separately.
ShedSafe accredited dealers, no exceptions. Every dealer on ShedDesigner is ShedSafe accredited under the Australian Steel Institute programme, which independently verifies dealer design and engineering against the National Construction Code and AS/NZS 1170.2 wind loading.
One design, multiple quotes. Your design goes out to dealers covering your region. Every quote prices the same garage, in the same steel, to the same engineering, so the quotes you get back are directly comparable.
Wind region pricing transparency. A 6 by 6 garage in Region C (cyclonic northern coast) typically costs roughly 25 to 30 per cent more than the same garage in Region A (most inland Australia). The extra cost pays for heavier RHS sections, wind-locked doors, denser fixings and AS 3566 Class 4 fasteners. Your dealer engineers to the actual region for your block, not a national average.
Key Specs
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From barns, garages, covers to 1, 2 or 3 vehicle garages the design options are limitless.
Frequently Asked Questions
What size is a standard double garage in Australia?
The most common footprint is 6 by 6 metres internal with a 2.4 to 2.7 metre eave height (36 square metres of floor). For dual-cab utes, 4WDs or storage at the back, builders usually step up to 7 by 6 metres or 7.5 by 7 metres at a 2.7 to 3.0 metre eave. The Australian Standard for parking, AS/NZS 2890.1:2004, sets the minimum bay at 2.4 by 5.4 metres, so two bays side by side need at least 5.1 metres of internal width before any clearance.
Can I fit two utes in a 6 by 6 double garage?
Tightly. A modern dual-cab ute runs around 1.95 metres wide and 5.4 metres long. Two side by side hit the AS/NZS 2890.1 minimum with almost no door-opening clearance. Most ute owners step up to 6.5 by 6.5 metres or 7 by 6 metres so doors can open without scraping the neighbour's mirror.
Two single roller doors or one double?
Two singles (each around 2.4 metres wide) give you a centre column for structural support and let one bay stay closed when the other opens. Better in wind and better for security. One wide double (around 4.8 metres wide) gives unobstructed entry for boats, trailers and angled parking but costs more and adds wind load on the door. Allow 450mm of headroom above the opening for the drum either way.
Do I need council approval for a double garage in NSW?
Almost always. NSW SEPP Exempt and Complying Development Codes cap exempt non-habitable structures at 20 square metres in residential zones. A standard 6 by 6 double garage is 36 square metres, so it sits above the cap and needs either a Complying Development Certificate or a full DA. Setback minimum is 900mm from each boundary. Always confirm with your local council before pouring the slab.
What slab thickness do I need for a double garage?
150mm reinforced concrete is the standard for a double garage carrying two passenger vehicles, with SL72 or F72 mesh as reinforcement. Step up to 200mm for utes, 4WDs or workshop machinery. Compliance sits under AS 2870 (residential slabs and footings) and AS 3600 (concrete structures), and slab classification depends on your soil report.
Can I add a workshop bench area to the back?
Yes, but plan the depth, not just the width. Two cars need 5.4 metres of length. A 600mm workbench at the back wall pushes you to 6 metres of internal depth minimum. A proper 1 metre workshop zone with shelving needs 6.5 to 7 metres. Add a personal access door on the side wall so you can get in without opening the main door.
Why does the same garage cost more in cyclonic regions?
AS/NZS 1170.2 splits Australia into Regions A, B, C and D. Cyclonic Regions C and D require heavier RHS sections, wind-locked doors, denser fastener spacing and AS 3566 Class 4 fasteners. The result is typically a 25 to 30 per cent build cost step-up over the same design in Region A. That extra cost buys an engineered structure that will hold up in a 232km/h gust.
Can I sleep or live in my double garage?
Not as a Class 10a structure, which is what a standard garage is built to under the National Construction Code. Living space requires Class 1a construction, with different framing, insulation, glazing, ventilation and approvals. Build the garage Class 10a now, and if you want a habitable build later, see shed homes or barndominium options.
Other Garage designs
Single Garages
Single garage designs for one vehicle. Customise doors, height, and accessories.
Triple Garages
A three-bay steel garage sized to AS/NZS 2890.1 parking standards, with a workshop bay option and 100% Australian-made BlueScope cladding.
Garaports
A garage and carport in one continuous build. One enclosed bay for daily security, one open bay for the boat, caravan or trailer. 100% Australian BlueScope steel.
Garage with Awning
Garage with attached awning. Extra cover for boats, caravans, outdoor work. BlueScope steel, ShedSafe accredited dealers.