Steel garages & workshops in Narre Warren & Berwick.

• 6×6m double garage (kit): One roller door, 2.7m wall, BlueScope C-section + Colorbond, kit supply only. ~$4–$5.5K kit. Slab and erect on your account.
• 6×6m double garage (full build): Engineered slab to AS 2870, permit, two motorised roller doors, PA side door, gutters & downpipes, surveyor sign-off. ~$14–$19K turnkey.
• 6×9m three-car garage / two-bay workshop: 3.0m wall height, two roller doors, PA door, three-phase conduit rough-in, mezzanine-ready truss. ~$18–$25K full build.
• 7×12m tradie workshop: 3.6m wall, twin 3.0m roller doors, insulated roof, three-phase 32A + dedicated welder circuit, fluorescent / LED batten lighting on dedicated circuit, polished sealed slab. ~$28–$42K.
• 9×15m enthusiast workshop (rural-residential): 4.2m wall for vehicle hoist clearance, four roller doors, mezzanine with timber floor, fully insulated walls and roof, polished concrete, three-phase 63A. ~$55–$85K.

What “BlueScope spec” actually means.

We use BlueScope C-section purlins (C15010 to C30024 depending on span and bay spacing), TrueCore frame, Colorbond Ultra cladding (AM125 base, 25-year written warranty against perforation on roof, 15 on walls) and Zincalume Z600 trim where Colorbond colour isn’t required. Screws are Buildex Climaseal 4 in galvanised stitching screws with EPDM washers — they outlast the sheeting they fasten. No imported coil substitutions. The spec sheet goes on your quote.

Wall heights — pick once, can’t change later.

• 2.4m: Storage only, no work bench — we don’t recommend this any more.
• 2.7m: Standard double-garage height, family cars, light DIY.
• 3.0m: Workshop bench at 900mm with overhead pegboard / shelving, 4WD with roof racks fits.
• 3.6m: Tradie workshop, dual-cab utes with ladders, room for a small mezzanine.
• 4.2m: Two-post vehicle hoist clearance, mezzanine, caravan / horse-float storage.

Why slab depth matters in Casey.

City of Casey is mostly Class M (moderately reactive clay) with pockets of Class H1 (highly reactive) toward the Hallam Valley and the rural-residential fringes. AS 2870 minimum for a Class M shed slab is a 100mm slab on grade with 300mm deepened edge beams reinforced with two N12 bars top and bottom — not the 75mm thickener some kit suppliers quote. On Class H1 we drop to piered footings or move to a stiffened raft. The slab is the cheapest place to save money short-term and the most expensive place to save money long-term.

Permits & setbacks — we lodge.

We lodge the City of Casey building permit, supply the AS 1170 wind-load engineering certificate, book the private building surveyor, and chase the inspection slots so your slab pour and steel-up aren’t blocked by paperwork. Permit + surveyor + engineering total around $1,800–$2,800 and is included in our supply-and-install quotes — itemised, not hidden.