Whether you’re comparing double garage kits Australia, speccing a custom-built double garage in Perth, or hunting for garage sheds for sale, this guide gives you the facts on design, durability, engineering and double garage prices in 2025. We cover cyclone compliance for QLD, council pathways across states, and practical upgrades like a 2 bay shed with awning or a double garage and workshop combo. Read the buyer checklist near the end for quick next steps.

What size is a standard double garage in Australia?

The most common footprint for a double car garage is 6.0 m × 6.0 m with a nominal eave height of 2.4–2.7 m. For utes, 4WDs, roof racks or trailers, prefer 6.0–7.5 m depth and 3.0 m eave height. Popular larger plans are 6.0×7.5 m and 7.0×7.0 m to allow a workshop bay or storage mezzanine.

• Typical plan examples: 6.0×6.0 m (two cars only); 6.0×7.5 m (cars + 1.2–1.5 m bench/storage); 7.0×9.0 m (one bay workshop + parking).
• Door sizes: twin 2.4–2.7 m roller doors or single 4.8–5.2 m panel lift — allow 200–300 mm clearance each side for door hardware.
• Vehicle clearance: allow 2.2–2.4 m clear opening for most SUVs/utes; 2.7–3.0 m if roof racks or high-top canopies are used.
• Mezzanine/head height: keep 2.0–2.2 m headroom above a mezzanine; structural loads and access ladder/platforms must be engineered.
• Layout notes: a 6×7.5 can be arranged as 2×2.7 m door bays + 1.5 m workshop bench; a 7×7 gives more manoeuvre space for longer wheelbases and storage.

Double garage prices in Australia: 2025 overview

Prices current as of May 2025 — ranges exclude GST and council fees. Below are indicative bands for a metro site with standard access; final price varies with wind rating, soil and access.

Representative cost breakdown (6.0×6.0 m example):

• Kit (frame, sheets, fixings, basic plans): $6,500–$14,500 (depending on spec and Colorbond finish).
• Concrete slab: typically $90–$160/m² (standard 100–125 mm slab with engineered edge/thickened footing). For a 36 m² slab expect $3,240–$5,760.
• Doors (two auto rollers or single panel lift): $2,000–$7,500 depending on size, insulation and wind-locks.
• Engineering & certifier fees: $900–$4,000 (site-specific wind/footing design, soil tests extra).
• Delivery/cranage & siteworks: $500–$4,000 (remote access or crane lifts increase cost).
• Supply + install (no slab): $11,000–$22,000 typical for standard N2/N3 builds in metro zones.
• Turnkey with slab: $18,000–$38,000+ (includes kit, slab, install, gutters, basic electrical and permits).
• Premium/custom (high eaves, workshop bay, insulation, BAL upgrades, cyclone upgrades): $30,000–$55,000+.

How we calculated prices: assumptions — metro site access, no contaminated fill, standard N2/N3 wind region unless noted, Colorbond or Zincalume cladding at typical thicknesses. Council fees, private certifier fees and unusual access or remediation add to cost.

Typical additional fees to budget: soil test $400–$1,200, council application/fee $0–$3,500 (varies by state and DA vs complying development), BASIX and bushfire reports where required. Expect delivery surcharges for regional/rural: $300–$2,000.

Materials and climate suitability for Australian garages

Choose materials to match the local climate: coastal salt, QLD humidity and cyclones, inland heat and dust, or cold and condensation in TAS/VIC. Below are regional recommendations and material notes.

WA coastal / hot Mediterranean (Perth)

Colorbond is preferred for colour stability and heat-reflective options; use stainless or hot-dipped galvanised fasteners with protective coatings in splash zones. Add sarking/insulation and ridge/whirly ventilation to reduce internal temperatures.

QLD / NT — tropical, cyclonic risk

Specify cyclonic sheeting thickness, heavier purlins and certified C‑class wind design (C1–C4). Use motorised doors with certified wind-locks and consider battery backup for remote operation. Fasteners must meet coastal corrosion resistance; stainless fixings for near-coast installs.

TAS / VIC — cold, condensation risk

Prioritise vapour barrier and insulation (sarking + blanket/PIR). Manage condensation with ventilation and adequate eave/ridge vents. Ensure gutters and fall minimise standing water; metal roofs can be noisy in heavy rain — insulation helps.

Inland NSW / SA — heat and dust

Use Zincalume or Colorbond depending on budget; consider dust-sealing details at doors and adequate eave overhangs. For agro/rural buildings, Zincalume offers cost advantage but ensure fastener and edge protection against abrasion.

Materials notes: Colorbond = pre-painted finish backed by warranty and good coastal performance when specified to exposure zone. Zincalume = Al‑Zn alloy coating, lower cost, good reflectivity. For all coastal builds use stainless fixings or corrosion-resistant coatings; consult Australian Steel Institute guidance and supplier corrosion zone charts. For more on coastal/cyclone specs see the Australian Steel Institute.

Design options and upgrades to get right

• Roof pitch: Gable 20–30° gives classic look and attic ventilation; skillion 2–10° suits solar and modern aesthetics. For solar panels consult pitch and orientation guidance.
• Gutters & fall: Minimum fall 1:100; use 90–115 mm box gutters depending on catchment. Provide soakwell or stormwater connection.
• Doors & motorisation: Choose wind-locked roller doors in higher wind areas. Consider torque rating, UPS/battery backup in cyclone-prone zones, and manual emergency release if power failure occurs.
• Workshop bay: Add 1–2 m depth, 900–1,200 mm bench width and 10–20 amp power circuits. Provide dedicated ventilation and consider mezzanine loadings (engineer-specified live loads).
• Insulation/ventilation: Sarking + foil-backed blanket or PIR panels reduces internal temperature by ~5–10°C; ridge vents and whirlybirds improve airflow. In humid climates use cross-ventilation and dehumidifiers if needed.
• Security & finishes: Colorbond cladding with internal lining improves security and aesthetics. Consider anti-condensation paint or internal linings in cold climates.
• Drainage specifics: Design slab fall (min 1:100), edge beams and connection to stormwater to prevent slab undermining. For permeable soils include drained footings per engineering.

For installation guidance and turn-key options see our product-specific options in double garage kits Australia.

DIY garage kits vs custom-built garages

Which route depends on budget, skills and site complexity. Below are practical differences and a buyer checklist.

• Kit components: typically include frames, rafters/purlins, girts, sheeting, flashings, screws, plans and often stamped connection details. Confirm sheet thickness, purlin spacing and fastener types before purchase.
• Assembly time: expect 60–250 man‑hours (2–6 people) for a 6×6 kit depending on experience, equipment and site prep. Crane hire reduces manual handling time but adds cost.
• Warranties: manufacturer structural warranties vary; supplier-installed turnkey generally includes workmanship warranties and easier claims handling.
• Approvals: DIY kits require the owner to manage engineering, soil tests and council applications unless the supplier offers approval packs. For complex or cyclonic sites prefer turnkey with in-house engineering.
• Decision matrix: Simple, flat, accessible sites = kit may save cost; complex, sloping or high-wind sites = custom-built/turnkey strongly recommended.