Can you install solar yourself in Perth? What the rules actually say

Solar DIY content is popular online — overseas guides show homeowners wiring their own panels and inverters. The rules in Western Australia are different, and understanding them prevents significant legal and financial exposure. Here's what's allowed and what's not.

The short answer

In Western Australia, you can legally:

• Mount solar panels on your roof (panel placement, racking installation)
• Run DC cable between panels
• Do site preparation work

You cannot legally (without a licensed electrician):

• Connect the DC cables from panels to the inverter
• Connect the inverter to your switchboard
• Do any mains electrical work

And without CEC accreditation, you cannot:

• Claim STCs (the point-of-sale rebate)
• Lodge a Network Connection Notice (NCN) with Western Power
• Commission the system for grid connection

In practice: A fully functional, grid-connected solar system in Perth cannot legally be installed without at least one CEC-accredited person performing the work.

What the WA rules say

Electrical licensing requirement

In WA, electrical work is regulated under the Electricity (Licensing) Regulations 1991. Work involving the electrical wiring of a solar system — connecting the inverter to the switchboard, DC wiring between the panels and inverter, earthing — is "electrical work" that must be performed by a licensed electrical contractor or a licensed worker under a contractor's licence.

Performing unlicensed electrical work in WA is an offence. Energy Safety WA enforces this.

CEC accreditation requirement

Separate from the electrical licensing requirement, claiming Small-scale Technology Certificates (STCs) — the federal rebate that discounts your system cost — requires the installation to be:

• Designed by a CEC-accredited installer
• Installed by a CEC-accredited installer

Without CEC accreditation, you cannot create STCs. The STCs are typically worth $1,600–$2,200 for a 6.6kW Perth installation (as of 2026 STC prices). An installation without CEC involvement loses this discount.

Network connection notice (NCN)

Connecting to the grid and accessing DEBS requires a Network Connection Notice (NCN) lodged with Western Power. NCN lodgement must be performed by a CEC-accredited person. Without it, your inverter cannot legally export to the grid.

What DIY enthusiasts can legally do

Panel placement and racking: In WA, physically mounting panels on a roof and installing the racking/mounting system is not classified as electrical work. A qualified builder or a motivated homeowner can legally mount panels.

Pre-wiring conduit runs: Installing conduit for cable runs between the roof and inverter location (without pulling live cables) may be done before a licensed electrician completes the electrical connection.

Ground preparation and infrastructure: Preparing a concrete pad for a battery or inverter, running conduit between outbuildings, and similar civil/building work can be done without electrical licensing.

Off-grid/standalone systems (under certain conditions): Off-grid systems not connected to the grid have different rules — a self-contained system powering a remote shed or caravan may have more flexibility, but this still requires compliance with AS/NZS 4509 (standalone power systems) and AS/NZS 3000 (wiring rules) for any mains voltage work.

The practical solar DIY path in Perth

Many homeowners interested in reducing costs take a partial DIY approach:

1. Do the site preparation: Mount the racking, position panels, run conduit (don't pull cable yet)
2. Hire a CEC-accredited solar electrician to complete the electrical work (DC wiring, inverter connection, switchboard work, NCN lodgement, commissioning)
3. Claim STCs and grid connection through the accredited installer

This approach legally allows you to do the physical labour of panel mounting, reducing the installation cost (labour savings on the mechanical portion). The licensed electrician portion of a solar installation — which must still happen — is typically the smaller cost component.

Estimated cost of electrician-only portion: The licensed electrical work component of a residential solar installation (without supply of panels and inverter) is typically $800–$1,500 for a standard job. The system components (panels, inverter, racking, DC cables) are the major cost.

Insurance implications

A solar system installed without proper licensing and CEC accreditation:

• Home insurance: May not be covered. Most home insurance policies require electrical work to be performed by licensed contractors. An unlicensed installation that causes a fire or roof damage may result in a rejected claim.
• STCs: Cannot be claimed (as noted above)
• Grid connection: Cannot be legitimately connected to the grid
• Selling: May require disclosure as a non-compliant installation; the buyer may require removal or certification at your cost

The combination of lost STCs ($1,600–$2,200), potential insurance voiding, and sale complications makes fully-unlicensed DIY solar a poor financial decision even for skilled electrical DIYers.

The economics: is partial DIY worth it?

For a typical 6.6kW Perth installation:

• Full professional installation: $5,500–$8,000 all-in (after STC discount)
• Panels + inverter + racking material cost (DIY purchase): $2,500–$4,000
• Licensed electrician engagement (materials + labour): $800–$1,500
• STC claim through accredited installer: −$1,600–$2,200

Realistic DIY-assisted total: $3,500–$5,300

Realistic savings from DIY: $500–$1,500 vs. full professional installation

For significant DIY savings, you'd need to source materials at competitive trade prices (not always accessible to homeowners), successfully complete the mechanical installation, and have a cooperative CEC electrician willing to complete someone else's partial installation. Many licensed solar electricians won't certify work they didn't complete — creating warranty and liability uncertainty.

The WA regulatory framework for grid-connected solar makes full DIY installation impractical without sacrificing STCs, grid connection, and insurance coverage. A partial DIY approach (mechanical labour only) can reduce costs but requires finding a CEC electrician willing to complete and certify work started by a homeowner — ask explicitly before purchasing materials.