Patios, Sheds, Retaining Walls, and Fences: When Do You Actually Need Council-Approved Drawings

 

residential drafting in Perth - Domestic Drafting Service

A patio can look like a straightforward weekend project until someone asks about setbacks, drainage or engineering. The same thing happens with sheds, retaining walls and front fences. What appears minor in the backyard may still need planning approval, a building permit, or both. Perth councils apply state legislation and local planning schemes, so the answer depends on size, height and location. Checking first costs less than fixing unauthorised work later.

Planning Approval and Building Permits Are Different

Planning approval considers where the structure sits and how it affects neighbouring properties or the street. A building permit focuses on structural safety and compliance with the National Construction Code.

You may need one approval without the other, and local policies vary.

Structure	Approval Is More Likely When
Patio	It is attached, large, close to boundaries or outside planning standards
Shed	It exceeds exemption limits or affects setbacks and open space
Retaining wall	It holds back more than 500 millimetres of soil
Fence	It exceeds local height limits or sits within the front setback

Patios Often Need More Detail Than Expected

A small freestanding patio may qualify for a building permit exemption where it is under 10 square metres and no more than 2.4 metres high. The exemption becomes less likely when the patio attaches to the house, combines with other Class 10a structures or falls outside planning requirements.

One practical trap is the roofline. A patio that looks separate in a sketch may rely on the dwelling for support once construction starts. That changes assessment.

Clear residential drafting in Perth should clearly show:

• Dimensions, posts and roof connections.
• Distances from lot boundaries.
• Existing buildings and stormwater disposal.
• Ground levels where they affect height.

Sheds Can Cross the Line Quickly

One freestanding shed under 10 square metres and below 2.4 metres may not need a building permit. Larger sheds generally do. Planning approval may still apply because of zoning, setbacks, heritage controls or remaining open space.

And this matters because two small structures may be assessed by their combined area, not treated as separate exemptions. A shed beside an existing gazebo can push the property over the limit.

For workshops, storage buildings or business premises, commercial drafting in Perth plans may need fire, access and engineering information for its use.

Retaining Walls and Fences Need Site Context

Retaining walls above 500 millimetres generally require a building permit, and planning approval may arise where neighbouring land is affected. A fence may avoid a permit at one height yet need approval at another, especially along the street.

The awkward bit is measuring from natural ground level. Fresh fill can make a wall appear shorter than it legally is.

Before lodging, confirm:

• Total retained height, including stepped sections.
• Drainage and surcharge loads.
• Fence height on both sides.
• Easements and adjoining structures.

Drawings That Prevent A Costly Rebuild

Domestic Drafting Service can prepare coordinated plans for patios, sheds, walls and fences, including site details that councils commonly request. Working with a residential draftsman in Perth before construction helps settle approval questions while changes still exist only on paper.