Shed Cost Calculator

Understanding shed costs in Australia

What a shed costs in Australia in 2026

Shed pricing depends heavily on whether you are talking about the kit alone or the finished structure standing on a slab. As kits only, a basic 3m by 3m garden shed runs $700 to $2,000, a single garage size 6m by 3m $2,500 to $5,000, a double garage 6m by 6m $5,000 to $9,000, and a 9m by 6m workshop $9,000 to $16,000. Once you add a reinforced slab, footings, erection labour, doors and any site works, the delivered cost typically sits 60 to 120 per cent above the kit price. In practice that means a double garage shed fully finished on a new slab commonly lands $12,000 to $20,000, a workshop $18,000 to $30,000, and a garden shed on a modest slab $2,500 to $4,500. Rural sheds in the 12m by 9m and larger range start around $30,000 and rise quickly with height and door provision.

The slab is half the project

A concrete slab for a shed is not a trivial line item and is not the same as a plain driveway pour. It typically costs $120 to $200 per square metre for a properly engineered shed slab, which puts a 6m by 6m slab around $4,500 to $7,000 and a 9m by 6m workshop slab around $6,500 to $11,000. The reason it costs more than a path is what is in it. Shed slabs need thickened edge beams where the portal frame columns land so the point loads are carried properly, correctly positioned reinforcement, an appropriate vapour barrier and, critically, cast in anchor bolts set out to match the shed manufacturer's hold down points. Getting the bolt setout right requires the shed drawings before the pour, which is why the sequence matters. Drilling chemical anchors into a plain slab after the fact is common and it quietly undermines the certified wind uplift rating.

Council approval, thresholds and what triggers a DA

This is where shed projects go wrong most often. Many councils allow a shed as exempt development, requiring no approval at all, but every exemption is bounded by conditions. The usual ones are a maximum floor area, a maximum height above natural ground level, minimum setbacks from side and rear boundaries, a prohibition on being forward of the building line, and a cap on the total site coverage of all outbuildings combined. Exceed any single threshold and you move into either a complying development certificate, which is faster and certifier assessed, or a full development application, which is council assessed and slower. Realistically that adds $1,000 to $4,000 in fees, plans and certification, plus several weeks to several months of time. Bushfire prone land, flood affected land, heritage areas and sites with drainage or sewer easements change the answer regardless of size. Check before ordering, not after delivery.

Engineering, wind classification and soil

Every shed sold in Australia should come with structural certification, but the certification is only valid for the wind region and terrain category it was designed for. A kit rated for a sheltered suburban site is not adequate on an exposed rural ridge or in a cyclonic region, and using it there is both unsafe and uninsurable. Larger sheds generally need site specific engineering rather than a generic certificate, with the engineer sizing the footings, portal frames and bracing for your actual wind classification and soil class. Reactive clay soils, common across much of Melbourne, Adelaide and parts of Sydney, need deeper or wider footings than sand, and that flows straight into the slab cost. Engineering and certification on a workshop or rural shed commonly runs $1,500 to $3,500 and should be treated as a line item rather than an assumption.

Site works and the cost of a slope

The item that most often blows a shed budget is the ground it sits on. A shed needs a level pad, and creating one on a sloping site means cut and fill, often retaining on the high side, and always drainage so that water does not run into the shed or undermine the pad. Depending on the fall across the footprint, site works commonly add $2,500 to $8,000, and on a steep block considerably more. Access matters too, since a concrete truck and a delivery truck need to get reasonably close, and pumping concrete or hand barrowing it adds cost quickly. Walking the block before you commit to a position, and choosing the flattest viable location even if it is slightly less convenient, is the highest value decision in the whole project.

Doors, height and getting the specification right

Wall height is worth thinking about carefully because it is the one thing you cannot change later. Standard 2.4m to 2.7m walls are fine for storage and general use. If you intend to fit a car hoist, store a caravan or boat, or run a mezzanine, you need 3.6m or more, and the incremental cost of extra height at order time is far lower than the cost of realising you needed it. Doors follow the same logic. A single roller door on a workshop is a bottleneck, and adding a second door or a personal access door at order time costs a fraction of retrofitting one into a finished wall. Insulation and lining is the other consideration. An uninsulated steel shed in an Australian summer is genuinely unusable through the middle of the day, so if it is going to be a workshop rather than storage, budget for insulation from the start.

Comparing quotes and sequencing the job

Price the kit, the slab and the erection separately at least once, even if you ultimately buy a turnkey package, because that is the only way to know what the turnkey premium is. Confirm what the quoted price includes on approvals, engineering, site works and connection of power, since those four are the most commonly excluded items. Sequence matters as well. Get the council position confirmed first, then order the kit and obtain the setout drawings, then pour the slab with the anchor bolts positioned correctly, then erect. Skipping the drawings and pouring early is the most frequent and most expensive sequencing mistake in shed building. Use the estimator above to set a realistic total, then let the itemised quotes fill in the detail.