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Maximum Shed Size Without Planning Permission in Perth: Complete Guide

· 4 min read

Building a shed in Perth without going through the planning approval process can save you time and money. However, it's crucial to understand the exact limitations to avoid costly mistakes or having to remove non-compliant structures.

Key Size Limits for Exempt Sheds​

In the Perth region, you can build a freestanding shed without planning permission if it meets these criteria:

Floor Area​

  • Maximum floor area: 10m² (approximately 3.2m × 3.1m)
  • This is roughly the size of a small garden storage shed

Height Restrictions​

  • Maximum height: 2.4m (measured from ground level to the highest point)
  • This includes any roof pitch or ridge height

Location Considerations​

  • Wind regions C or D: If your property is in these high-wind areas, you'll need a building permit regardless of size
  • Property boundaries: Can be built right up to the boundary line

Fire Separation Requirements​

Even exempt sheds must comply with fire safety regulations under the National Construction Code Part 9.2:

Distance from House​

  • Minimum 900mm from any house wall
  • Minimum 450mm from house eaves/overhangs

Distance from Boundary​

  • Minimum 900mm from property boundaries (unless the shed is 900mm+ from the house)

Why These Distances Matter​

These fire separation requirements prevent fire spread between structures and protect your home and neighbouring properties. Non-compliance can result in:

  • Fines and penalties
  • Required demolition of the structure
  • Insurance coverage issues

What Counts as "Freestanding"​

A shed is considered freestanding when:

  • It's not attached to your house or other buildings
  • It has its own independent foundation
  • It's not structurally connected to other structures

When You DO Need Planning Permission​

You'll need to apply for a building permit if your shed:

  1. Exceeds size limits: Floor area > 10m² or height > 2.4m
  2. Is in high-wind areas: Wind regions C or D
  3. Is attached to your house: Even if it's small
  4. Has special features: Such as plumbing, electrical work, or living spaces
  5. Is in a heritage area: Or other special planning zones

Planning Permit Process​

If you need a building permit, the process typically takes:

  • Simple applications: 10-20 working days
  • Complex applications: 20-40 working days
  • Applications requiring referrals: Up to 60 working days

Practical Examples​

Exempt Shed Examples​

  • 3m × 3.3m garden shed (9.9m²) - ✅ Exempt
  • 2.5m × 4m storage shed (10m²) - ✅ Exempt
  • 3m × 3.5m workshop (10.5m²) - ❌ Requires permit

Height Examples​

  • 2.4m high flat roof shed - ✅ Exempt
  • 2.6m high pitched roof shed - ❌ Requires permit
  • 2.3m high with 100mm foundation - ✅ Exempt

Tips for Staying Compliant​

  1. Measure carefully: Include all dimensions in your calculations
  2. Check wind zones: Contact your local council to confirm your wind region
  3. Consider future needs: It's often better to get a permit for a larger shed than to build multiple small ones
  4. Document everything: Keep photos and measurements of your exempt shed
  5. Consult professionals: When in doubt, ask a builder or building surveyor

Common Mistakes to Avoid​

  • Underestimating height: Including roof pitch in measurements
  • Ignoring eaves: Forgetting about house overhangs
  • Boundary confusion: Not understanding property line measurements
  • Wind zone assumptions: Assuming you're in a low-wind area

Local Council Variations​

While the basic rules apply across Perth, some local councils may have additional requirements:

  • City of Perth: Generally follows standard regulations
  • Suburban councils: May have specific local planning schemes
  • Rural areas: Often have more flexible rules but stricter fire safety requirements

Getting Help​

If you're unsure about your specific situation:

  1. Contact your local council for planning advice
  2. Consult a building surveyor for technical guidance
  3. Talk to experienced shed builders in your area
  4. Check the Department of Planning, Lands and Heritage website

Conclusion​

Building a shed without planning permission in Perth is possible, but only within strict limits. The 10m² floor area and 2.4m height restrictions, combined with fire separation requirements, mean most practical workshop or storage sheds will need permits.

For small garden storage needs, exempt sheds work perfectly. For larger or taller structures, the planning permit process is straightforward and ensures your shed meets all safety and compliance standards.

Remember: It's always better to check first than to face expensive corrections later. When in doubt, consult with your local council or a building professional to ensure your shed project stays compliant and safe.