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What is a large commercial shed?
A large commercial shed is a steel-framed building above roughly 1,000 square metres of floor area or above 30 metres of clear span, used for industrial production, bulk storage, distribution, transport depot operations or mixed-use commercial work. The build sits in a different engineering and approval regime to a small workshop or garage. Slabs are heavier, portal frames are deeper, fire engineering is mandatory and the planning pathway runs through full Development Application in every state.
ShedDesigner's large commercial shed templates are built from 100% Australian-made BlueScope structural steel, clad in Colorbond®, and engineered to AS 4100 Steel structures and AS/NZS 1170.2 Wind actions for the actual site (Standards Australia). Pick a template, set your span, length, eave height and roller-door spec, then submit your design once for free comparable quotes from ShedSafe accredited dealers in your region.
Span, eave and the column trade-off
Two engineering decisions drive the build cost on every large shed.
Clear span vs internally columned. Most Australian large commercial sheds run between 24 and 45 metres of clear span without internal columns. Spans up to 60 metres are routine with engineered portal frames (Standwell, Commercial sheds and industrial buildings). Above 30 metres, the cost-per-square-metre starts climbing as portal frames get heavier. For very wide buildings, internal columns at 12 to 15 metre centres can drop the steel cost by roughly 15 to 20 per cent compared to fully clear-span, but they constrain forklift turning, racking layout and truck access. Decide before locking the design.
Eave height. 7 to 9 metres is the practical sweet spot for combined forklift, three-tier pallet racking, B-double clearance through a 5 to 6 metre tall roller door and overhead crane fit-out where required. Higher eaves are routine in transport depots and manufacturing buildings where overhead handling matters; they ramp wind load, steel cost and roof bracing. The 3D designer flags any combination that triggers an engineering review.
Roller door size. A 5 by 5 metre industrial roller door clears semi-trailers and B-doubles. The practical maximum on commercial roller-door product is roughly 5.1 metres tall by 5.4 metres wide. Plan turning circle as well: a 19 metre semi needs about 25 metres of hardstand to swing, and a B-double needs longer.
NCC classification at scale
Large sheds rarely sit in a single NCC class.
Class 7b is pure storage (a building used for storage or display of goods or produce for sale by wholesale). Class 8 is a factory, workshop or production facility (Australian Building Codes Board, NCC Building classifications). Most large commercial sheds at scale combine both, often with a Class 5 office attached.
The mixed-use rule in NCC Part A6: ancillary classes occupying up to about 10 per cent of floor area can be classified to the dominant class. Above that, the parts must be classified separately, and fire separation under NCC Section C kicks in. Practically, a 300 square metre office attached to a 4,000 square metre warehouse is usually fine as one classification. A 1,000 square metre office attached to the same warehouse is two classifications with two fire-rating regimes, which materially changes both build cost and approval timeline.
For pure storage builds, see also our warehouse sheds page. For Class 8 production builds, see industrial sheds and factory sheds.
Slab, fire engineering and approval
Three specs that drive the cost band on every large build.
Slab. A typical large-shed slab on grade runs 150 to 200 mm thick at 32 to 40 MPa, reinforced with SL82 mesh, on 150 to 200 mm of compacted crushed-rock base placed in 75 mm lifts to 98 per cent Standard Proctor (Standards Australia, AS 3600 Concrete structures). Heavy point loads from racking, overhead cranes and B-double turning push the slab to the heavier spec. Slabs are not poured to a generic figure on serious commercial work.
Fire engineering. Class 7b above the relevant Type C / Type B threshold under NCC Section C usually requires AS 2118.1 automatic sprinklers and fire-rated walls between large-area sub-divisions (Australian Building Codes Board). Mixed-use Class 7b/8/5 builds also need fire separation between classes. A performance-based fire engineering report is standard practice on builds above 2,000 square metres.
Planning approval. Large commercial is not exempt or complying development anywhere in Australia. Every build goes through full DA, with councils assessing traffic, parking, lighting, hours of operation, fencing and amenity impact on neighbouring zones. Most also require a Traffic Impact Assessment and a Statement of Environmental Effects. Plan the engineering documentation into the quote pack from day one.
Before you get quotes
A large commercial shed is a 40-year asset. The compliance stack matters more than the colour palette.
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.
ShedSafe accredited dealers, no exceptions. Every dealer on ShedDesigner is third-party assessed under the Australian Steel Institute programme, which independently verifies dealer design and engineering against the National Construction Code, AS/NZS 1170.2 wind loading, AS/NZS 4600 cold-formed steel and AS 4100 steel structures (Australian Steel Institute, ShedSafe Accreditation).
Division 43 capital works ready. Commercial buildings, including new steel sheds used to produce income, generally qualify for a capital works deduction of 2.5 per cent a year over 40 years under Division 43, and buildings used mainly for eligible industrial activities may qualify for 4 per cent over 25 years (Australian Taxation Office, Capital works deductions, Division 43). The dealer's quote gives you the cost base. A quantity surveyor produces the depreciation schedule against it. Confirm eligibility with a quantity surveyor or registered tax agent.
One design, multiple quotes. Your large shed design goes out to dealers in your region. Every quote prices the same shell, in the same steel, to the same fire engineering pathway, the same NCC class and the same wind region, so the quotes you get back are directly comparable.
Browse the broader range on the Commercial Designs category page.
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Frequently Asked Questions
What's the maximum clear span for a large commercial shed in Australia?
Most large commercial buyers land between 24 and 45 metres of clear span without internal columns. Spans up to 60 metres are routine with engineered portal frames (Standwell). Above 30 metres, the cost-per-square-metre starts climbing as portal frames get heavier. Cyclonic Region C and D engineering caps practical spans tighter, around 30 metres for a standard build before custom engineering review applies.
When does it pay to add internal columns instead of clear-spanning?
Above roughly 30 metres of span, internal columns at 12 to 15 metre centres can drop the steel cost by roughly 15 to 20 per cent compared to fully clear-span. The trade-off is forklift turning, racking layout and truck access through the building. For storage with fixed racking aisles, internal columns are usually fine. For production, transport depots and overhead-crane buildings, the operational cost of working around columns usually outweighs the steel saving.
What slab spec do I need for a large commercial shed?
Most large-shed slabs run 150 to 200 mm thick at 32 to 40 MPa with SL82 mesh, on 150 to 200 mm of compacted crushed-rock base (Standards Australia, *AS 3600 Concrete structures*). Heavy point loads from three-tier racking, overhead cranes or B-double turning push the slab to the heavier spec. Slab thickness should come out of the racking layout and forklift point loads, not a generic figure.
Do I need fire sprinklers in a large commercial shed?
Usually yes. Class 7b above the relevant Type C or Type B threshold under NCC Section C generally requires AS 2118.1 automatic sprinklers and fire-rated walls between large-area sub-divisions (Australian Building Codes Board). Mixed-use Class 7b/8/5 builds also require fire separation between classes. A performance-based fire engineering report is standard practice on builds above roughly 2,000 square metres.
How much does a large commercial shed cost per square metre in Australia?
A 2026 large commercial shell sits between $400 and $550 per square metre installed (industry estimate based on Standwell, ABC Sheds and Steelcorp 2025 pricing references). Turnkey pricing including office fit-out, plumbing, electrical and hardstand runs roughly $1,200 to $2,800 per square metre depending on inclusions. A 40 by 60 metre clear-span shell sits roughly between $960,000 and $1.32 million before fit-out.
Do large sheds qualify for capital works depreciation?
Generally, yes. Commercial buildings, including new steel sheds used to produce income, qualify for a capital works deduction of 2.5 per cent a year over 40 years under Division 43 of the *Income Tax Assessment Act 1997*, and buildings used mainly for eligible industrial activities may qualify for 4 per cent over 25 years (Australian Taxation Office, *Capital works deductions*). A quantity surveyor preparing a depreciation schedule is the standard pathway when actual construction cost is not separately determinable. Plant items (overhead cranes, racking, fit-out) depreciate separately under Division 40 on shorter effective lives. Confirm eligibility with a quantity surveyor or registered tax agent.
Do I need a Development Application for a large shed?
Yes, in every state and territory. Large commercial is not exempt or complying development anywhere in Australia. Councils assess on traffic and parking, hours of operation, lighting, fencing, security and amenity impact on neighbouring zones. Most also require a Traffic Impact Assessment and a Statement of Environmental Effects. Lodge the DA before pouring the slab.
Can the shed handle an overhead crane?
Yes, with the crane factored into the engineering from the start. Overhead cranes drive heavier portal frames, additional bracing, deeper footings and a stiffer roof structure to handle the lateral and vertical loads from the crane runway. Retrofitting a crane into a finished shed almost always costs more than including it from day one. Plan crane capacity, runway length and hook height into the brief before the dealer quotes the steel.
Other Commercial designs
Self Storage Sheds
Repeating-bay storage units sized to operator economics, NCC Class 7b compliant, built from 100% Australian-made BlueScope steel.
Industrial Sheds
NCC Class 7 / 8 industrial sheds. Forklift clearance, fire compliance, BlueScope steel, fully customisable.
Factory Sheds
Factory shed designs for production and assembly operations. Engineered for heavy-duty use.
Warehouse Sheds
Class 7b clear-span warehouse shed with forklift-rated slab and truck-height roller doors. ShedSafe accredited dealers, BlueScope steel.