Design the ultimate barndominium with shed designer.
Design a barndominium online and get quotes from ShedSafe accredited dealers. NCC Class 1a ready, BlueScope steel, lender-aware, council-aware planning.
Why choose Barndominiums?
Australian BlueScope Steel
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Change every dimension to suit your needs
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What is a barndominium?
A barndominium is a barn-shaped steel building that's engineered, finished and certified as a habitable dwelling. The barn shell carries the structure, the proportions and the look. The interior is built to the same code as a brick-and-tile house: insulated, lined, glazed, plumbed, wired and signed off as a permanent home.
In Australia that means a barndominium is a National Construction Code Class 1a building. The Australian Building Codes Board defines Class 1a as a single dwelling, either standalone or one of a row of attached dwellings (Australian Building Codes Board, NCC 2022 Volume Two, Class of Building). It's the same classification as a project home from a major builder. The structural frame is just steel instead of timber.
For the bigger category context, see our shed homes page. The shorter answer for buyers comparing the two formats is in the FAQ.
Barndominium options
The 3D designer treats the barndominium as a barn shell first. You pick the shape, then plan the internal split.
American barn barndominium
Raised-centre barn with two long lean-tos. The raised centre carries the open-plan living and a high vaulted ceiling, and two-storey or mezzanine layouts work cleanly in the tall centre bay. Lean-tos host bedrooms one side, garage and workshop the other.
Aussie barn barndominium
Flat-ridge barn with lean-tos either side and a lower overall profile. Same lean-to layout without the raised centre, so living spaces run single-storey. Easier on council height limits, and a strong fit for inland and rural blocks where the low barn footprint reads naturally.
Workshop-attached barndominium
Living wing one end, full workshop with roller doors at the other, fire-rated wall between. Common for tradies, mechanics, farm operators and anyone who wants the workshop on the title without a second build.
Two-storey barndominium
Full-height first storey, mezzanine or second-storey loft above. Loft bedrooms over open-plan living downstairs. Plays to the high gable ceiling that defines the barn shape.
Building to NCC Class 1a
A barndominium is a Class 1a habitable build, not a Class 10a shed with a bed in it. That's the line councils, certifiers and lenders draw and the line that determines whether the build is legal to live in.
Class 1a means the build meets the NCC's habitable provisions in full. From May 2024 the National Construction Code 2022 lifted the minimum thermal performance for new Class 1a homes to 7 stars NatHERS, with separate whole-of-home energy use limits also applying (Australian Building Codes Board, NCC 2022 Energy Efficiency Provisions, effective 1 May 2024 in most states). The barndominium build is detailed for that benchmark from frame day one: insulated wraps, thermally broken cladding details, double glazing on solar-exposed elevations.
Wind and bushfire load both apply. AS/NZS 1170.2 sets the wind region (most rural barndominium blocks fall in Region A or B, coastal in C, far-north in D). AS 3959 sets the Bushfire Attack Level for blocks in designated bushfire-prone areas (Standards Australia, AS 3959:2018 Construction of buildings in bushfire-prone areas). The dealer's quote includes engineering documentation that supports the council application.
Before you get quotes
A barndominium is a 30-year build that has to satisfy your council, your bank and your family. Three process facts worth knowing before quotes go out.
100% Australian-made BlueScope Steel. Frame and 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.
ShedSafe accredited dealers, no exceptions. Every dealer on ShedDesigner is accredited under the Australian Steel Institute's third-party assessment programme, which verifies design and engineering practice against AS/NZS 1170.2 wind loading and the relevant NCC volumes (Australian Steel Institute, ShedSafe accreditation, 2024).
One design, multiple quotes. You design the barn shell once in the 3D designer. The build goes out to ShedSafe accredited dealers in your region, all priced against the same specification, so the quotes you get back are directly comparable.
See also our sibling barn pages: American barns for the raised-centre form and Aussie barns for the flat-ridge form.
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
Can I get a mortgage on a barndominium in Australia?
Some mainstream lenders treat a Class 1a barndominium as a standard residential mortgage, others classify it as a non-standard construction and either decline or require a higher deposit. Mortgage broker industry data published by Your Mortgage in 2024 noted that the big four banks generally lend on Class 1a steel-framed homes if the LVR is conservative (typically 80% or lower) and the build is signed off by a registered builder. Always confirm with your broker before locking in a design.
What's the difference between a barndominium and a shouse?
A barndominium is a barn-shaped Class 1a home. A shouse is a hybrid Class 1a + Class 10a build that pairs a non-habitable shed or workshop space with a habitable living wing under one roof. Shape is the difference: barndominiums use the barn form, shouses don't have to. Both are valid pathways to a steel-framed home with workshop space attached.
Do I need a Class 1a Building Certificate for a barndominium?
Yes. Living permanently in a Class 10a shed without a certified Class 1a conversion is illegal in every Australian state and territory. The certifier signs off when the build meets the NCC's habitable provisions: insulation, glazing, plumbing, electrical, fire separation if attached to a workshop, and energy efficiency. Your ShedSafe dealer's quote includes the engineering documentation the certifier needs.
What's the typical cost per m² of a barndominium build in Australia?
Industry estimates published by Houzz Australia and BMT Tax Depreciation in 2024 put steel-framed Class 1a barndominium builds at roughly $2,400 to $3,400 per m² of internal floor area, including the steel shell, slab, fit-out and finishes. The barn-only shell sits closer to $400 to $700 per m² depending on size, wind region and roof pitch. Final cost depends on inclusions, region, glazing, flooring and the local cost of trades.
How do you insulate a steel-framed barndominium for liveability?
Standard practice is a continuous external blanket between the cladding and the frame, plus internal batt insulation between studs and inside the roof cavity. Total wall R-values typically land at R2.5 to R3.5, ceiling R-values at R5.0 to R6.0, depending on the climate zone defined under NCC 2022 Section 13. The dealer specifies the build-up to hit the 7-star NatHERS minimum.
Can a barndominium meet the NCC 2025 NatHERS 7-star minimum?
Yes. The 7-star minimum has applied to most new Class 1a homes since 1 May 2024 under NCC 2022, and carried forward unchanged in NCC 2025 (Australian Building Codes Board). Steel-framed barndominiums hit it through a combination of orientation, glazing performance, insulation R-values and thermal breaks at cladding fixings. Your dealer or designer runs the NatHERS assessment as part of the certification pack.
Do I need development approval for a barndominium?
Yes. Because a barndominium is a Class 1a dwelling, every state and territory requires development approval (DA) or its equivalent before construction. That's separate from the Construction Certificate or Building Permit that follows. Rural and rural-residential blocks usually have additional bushfire, wastewater and access conditions on top.
What ceiling height should a barndominium have?
The NCC requires a minimum 2.4m ceiling height in habitable rooms (Australian Building Codes Board, *NCC 2022 Volume Two, Part H4*). Most barndominium designs run higher: 2.7m to 3.0m on lean-to bedrooms, 4.5m to 6.0m at the ridge of a vaulted American barn living space. The high ceiling is one of the form's defining features and is worth designing in deliberately.
Other Barn designs
American Barns
Classic raised-centre barn with twin lean-tos. Tall machinery clearance, stables-ready, fully customisable in BlueScope steel.
Australian Barns
The classic low-profile Aussie barn: flat ridge, single skillion lean-to either side. Built from 100% Australian-made BlueScope steel.
Horse Barns
American or Aussie profile horse barn with breezeway, stalls and tack room. ShedSafe accredited dealers, BlueScope steel, designed to NSW welfare code.