6mx3m Garden Shed: Pricing, Design Options, Council Approvals and Australian Build Guide

18 Oct Garden Sheds

Perfect for a compact workshop, mower and bike storage, or a tidy backyard “storeroom”, a 6m x 3m shed punches above its weight. This guide explains pricing, Colorbond choices, wind ratings, permits, and build tips for Australian conditions.

Added 2024 WA wind-rating compliance notes

What is a 6mx3m Garden Shed — and Who Is It For?

A 6mx3m garden shed (also called a 6×3 shed, 6m x 3m shed, 3mx6m shed, or 6m x 3m garden shed) offers 18 m² of secure, weather-tight storage. It suits homeowners needing space for lawn gear, a compact workshop bench, bikes, camping kit, or a small trailer. It’s also a smart upgrade for investors targeting low-maintenance storage on rental properties.

Definition — BMT (Base Metal Thickness): The thickness of the steel before paint or coatings. Common cladding choices: 0.35, 0.42, or 0.48 BMT.

What Are the Best Shed Materials for Perth’s Climate?

For hot, coastal, and high-UV locations like Perth and regional WA, BlueScope Colorbond steel in 0.42 BMT or 0.48 BMT is the go-to for durability and aesthetics. In inland or budget-sensitive builds, Zincalume is a strong performer with excellent value.

Local context: Coastal WA (within ~1 km of surf) is a higher corrosion environment (C4/C5). Consider Colorbond Ultra, stainless fasteners, and extra eave/gutter care.

Colorbond vs Zincalume — Which Is Better for WA Conditions?

Feature Colorbond (incl. Ultra) Zincalume
Best use Coastal suburbs, premium aesthetics, urban design controls Inland/rural value, farm machinery storage, DIY shed kits
UV and heat reflection Excellent with Thermatech colours Very good reflectivity in bare metal finish
Corrosion resistance High; Ultra grade for severe marine Good inland; less suited to surf-side zones
Cost $$–$$$ $–$$
Warranty (indicative) Up to 20+ years (site-dependent) Up to 20 years (inland)

Standards and coatings: AS1397, AS/NZS 2728, and AS1562.1 for metal roofing and wall cladding.

How Much Does a 6m x 3m Garden Shed Cost in Australia?

  • DIY kit (Zincalume, non-cyclonic): approx. $2,800–$5,500
  • DIY kit (Colorbond, non-cyclonic): approx. $3,500–$6,500
  • Installed (standard wind regions): approx. $5,500–$10,000
  • Cyclone-rated sheds (QLD Region C/D): typically +15–35%
  • Concrete slab (100 mm, 25 MPa, SL72 mesh): approx. $1,200–$2,500

Pricing varies with BMT, wind region (N2–N4 or C1–C3), door/wall height, insulation, and accessories (roller doors, windows, vermin-proofing, whirlybirds).

Definition — Wind Region & Category: Australia uses AS/NZS 1170.2 and AS4055 to classify wind actions (e.g., N3 non-cyclonic, C2 cyclonic). This drives framing, fixings, and footing sizes.

Do You Need Council Approval for a 6×3 Shed?

Many councils allow a 6mx3m garden shed as exempt development if it meets height, setback, and site coverage rules. But requirements vary state-to-state and by zoning or overlays (heritage, BAL). Always check your LGA first.

How to Get Council Approval for Your Custom Shed in WA

  1. Confirm planning rules with your local council (setbacks, height, open space).
  2. Obtain engineered drawings to AS/NZS 1170.2 and AS4100 with site wind rating.
  3. Provide a site plan showing boundaries, easements, and stormwater disposal.
  4. For BAL areas, incorporate ember guards, non-combustible cladding, and glazing specs.
  5. Submit a certified application (BA1/BA2 process) where applicable.

Useful references:
HIA homeowner approval guides,
Master Builders compliance advice,
WA Planning portal.

Design Options for a 6m Garden Shed That Add Real Value

Framing and Cladding

  • Portal frame in galvanised steel; purlins/girts sized to wind region.
  • Cladding profiles: Corrugated or Trimdek in 0.42/0.48 BMT.
  • Height: 2.1 m standard; 2.4–2.7 m for workshop storage or tall roller doors.

Roof Types

  • Gable roof (10–15°): classic look, better heat release and attic heat venting.
  • Skillion roof (5–10°): modern lines, ideal near boundaries; check gutter capacity.

Openings and Access

  • Roller door 2.4 m wide x 2.1 m high (upgrade to 2.7 m for trailers).
  • PA door with three hinges and deadbolt; add security mesh to windows.
  • Windows: awning style with flyscreens for cross-ventilation.

Comfort and Durability

  • Insulation: Anticon 50 or AIR-CELL for roof/walls; reduce condensation.
  • Ventilation: whirlybirds, ridge vents, or louvre panels.
  • Gutters/downpipes sized to AS/NZS 3500; add a rainhead and tank connection.
Pro tip: Using insulated roof panels can reduce internal shed temperatures by up to 10°C in summer and cut condensation risk—especially helpful in Perth and regional WA heat.

Engineering, Wind Ratings, and Cyclone Readiness

Engineering must comply with AS/NZS 1170.2 (wind actions) and AS4100 (steel structures). For residential sites, AS4055 wind classes (N2–N4, C1–C3) guide tie-downs, fixings, and slab/footings.

  • WA metro: often N2–N3; coastal headlands or exposed sites may require N4.
  • QLD cyclonic: choose cyclone-rated sheds (C2–C3) with upgraded hold-downs, door wind-locks, and frame bracing.
  • Footings: 100 mm slab with thickened edges or piers per engineering; M16 chemical anchors for bolt-down kits.

Council-approved sheds WA, cyclone-rated sheds QLD, and custom Colorbond garages Perth typically include site-specific engineering and certification to speed approvals.

Definition — BAL (Bushfire Attack Level): A rating that dictates construction materials and ember protection. Common in WA and VIC. A 6mx3m shed in BAL-29 may need ember guards and non-combustible cladding.

Foundations and Slab: What Works Best for a 6m x 3m Shed?

  • Slab: 100 mm thick, 25 MPa, SL72 mesh, 50 mm cover. Thicken edges to 300 mm where specified.
  • Site classification per AS2870 to assess soil reactivity and pier requirements.
  • Stormwater: connect gutters to legal point of discharge or water tank.

Real-World Build Examples (2024–2025)

Perth, WA — 6mx3m Colorbond Skillion Workshop

  • Spec: Colorbond Woodland Grey, 0.42 BMT Trimdek, N3 wind region.
  • Features: 2.4 m roller door, Anticon 50 roof blanket, whirlybird, vermin-proofing.
  • Outcome: Internal temps dropped ~6–8°C with insulation and venting; install in 1.5 days.

Townsville, QLD — Cyclone Upgrade

  • Spec: C2 wind rating, door wind-locks, extra bracing and hold-downs.
  • Cladding: Colorbond Ultra for coastal corrosion control.
  • Outcome: Council approved with site-specific engineering; higher upfront cost but robust resilience.

Outer Melbourne, VIC — Compact Storage with Permit

  • Spec: 6m shed with gable roof; height limited by local overlays.
  • Use: Gardening gear + bikes; linked to stormwater tank to meet WSUD conditions.
  • Outcome: Simple approval; build aligned with nearby custom carports Melbourne streetscape.

Choosing the Right 6×3 Garden Shed: A Quick Checklist

5-Step Buying Guide for Custom Sheds in Australia

  1. Measure and plan: Confirm setbacks, easements, and slab size; decide on gable vs skillion.
  2. Select materials: Colorbond for coastal/urban; Zincalume for value. Choose 0.42 or 0.48 BMT in windy sites.
  3. Engineer it: Get AS/NZS 1170.2 wind certification; specify door wind-locks in exposed sites.
  4. Comfort and longevity: Add Anticon or AIR-CELL, ventilation, vermin seals, and quality gutters.
  5. Paperwork and trades: Organise council, stormwater, slab pour, and licensed sparkie for power.

Use-Cases and Layout Ideas for an 18 m² Shed

  • Workshop: 3 m bench, pegboard, and 15 A GPO for small machinery.
  • Garden + bikes: Roller door access, bike racks, wall-mounted shelving.
  • Pool gear: Pump enclosure, chemical storage (ventilation essential).
  • Rural: Quad bike bay, feed storage; pair with rural sheds NSW for larger machinery.
  • Home storage: Overflow from garage; complement with affordable carports for Australian homes.

Frequently Asked Questions

Is a 5×3 garden shed big enough, or should I go 6m?

A 5×3 is fine for basic storage, but the extra metre in a 6m shed lets you add a workbench or keep bikes and mower separate without crowding.

What’s the best door setup for a 3mx6m shed?

A single 2.4 m roller door plus a PA door is the most versatile. In windy sites, specify wind-locked rollers and heavier tracks.

Colorbond vs Zincalume — which lasts longer?

Both last decades when detailed correctly. In coastal WA/QLD, Colorbond Ultra is worth the premium. Inland, Zincalume offers top value.

Can I DIY a 6m x 3m shed?

Yes, with a quality kit and two people over a weekend. Follow engineered drawings, use correct fixings, and check squareness at each stage.

What about electricity and lighting?

Run underground conduit before the slab pour if possible. Use a licensed electrician with RCD protection and weatherproof fittings.

Build Quality, Warranties, and Standards

  • BlueScope steel with manufacturer warranties (site dependent).
  • Engineering to AS/NZS 1170.2, AS4100, AS1562.1, and AS4055 where relevant.
  • Corrosion detailing for coastal C3–C4 zones; fasteners to match coating system.

See technical guidance from the Australian Steel Institute and standards via the Standards Australia store.

Local Insights: Climate, Energy, and 2024–2025 Market Notes

  • Heat and UV: BOM reports ongoing hot summers in WA/SA. Light Colorbond shades reduce heat gain.
  • Condensation: Add roof blankets or sarking; ventilate to manage temperature swings.
  • Steel outlook 2024: Industry reports show stable to modest pricing; lead times improved versus 2022–23 spikes.

Learn more:
Bureau of Meteorology climate data,
CSIRO building materials research,
Energy.gov.au guidance on insulation,
and the 2024 HIA Outdoor Structures & Home Improvement insights.

Related Projects and Keyword Clusters

Homeowners often pair a 6mx3m garden shed with:

  • Custom-built double garage in Perth
  • Steel sheds Perth and custom Colorbond garages Perth
  • DIY shed kits for regional WA and rural sheds NSW
  • Patio roofs and custom carports Melbourne
  • Wind-rated sheds for cyclonic areas in QLD

Summary: Is a 6m x 3m Shed Right for You?

If you need a compact, council-friendly, and highly usable storage or workshop space, a 6mx3m garden shed is a smart, value-led choice. Prioritise correct wind rating, Colorbond grade for your site, good insulation/ventilation, and a compliant slab. With the right spec, it’ll serve for decades.

Citations: HIA; Master Builders Australia; Australian Steel Institute; BOM; CSIRO; Energy.gov.au; Australian Standards. Industry snapshots: “2024 Australian Steel Market Outlook”; “2024 HIA Outdoor Structures and Home Improvement Report”.

Quick Specs Reference

  • Size: 6m x 3m (18 m²). Variants: 6×3 shed, 6m x 3m shed, 3mx6m shed, 6m garden shed.
  • Cladding: Colorbond or Zincalume, 0.42–0.48 BMT recommended in windy sites.
  • Wind: N2–N4 (most of AUS), C1–C3 (QLD cyclonic) per AS/NZS 1170.2 / AS4055.
  • Foundation: 100 mm 25 MPa slab, SL72 mesh; thickened edges/piering as engineered.
  • Popular add-ons: Anticon, AIR-CELL, whirlybirds, vermin seals, rainwater tank.

Excerpt: Planning a 6mx3m garden shed in Australia? Get pricing, engineering, Colorbond vs Zincalume guidance, WA wind-rating notes, QLD cyclone tips, and a step-by-step approval and buying checklist. Build smarter and compliant—whether it’s a DIY kit or a custom Colorbond shed engineered for your site.