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Best Solar Installers in Australia

There is no official top 10 solar companies list in Australia, so we check installers city by city: 30 established companies in 5 capitals, rechecked on 30 September 2026. We're not an installer, and no installer owns a piece of Why Solar. This page explains how we judge solar installers and shows what solar costs in each city once the federal rebate comes off.

The short version: the best installer for your home is the one that will still be around when you need the warranty, sends its own qualified people, fits exactly what it quoted, and handles problems properly. Pick your city below, or read on for the standard we hold installers to.

Updated September 2026

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Best solar installers by state and city

Each city page lists established local installers, the price of a typical system after the STC rebate, payback for 6.6 kW and 10 kW systems, the local network's export rules and the questions homeowners there ask most.

What a 6.6 kW system costs in each city

Installed prices differ between the capitals, and so does the federal rebate, because it depends on the STC zone a city sits in. This is the 6.6 kW system most price comparisons use.
  • MelbourneZone 4, 4.1 sun hours
    Installed price
    $5,500 to $7,200
    STC rebate
    $1,482
    Price after STCs
    $4,018 to $5,718
  • SydneyZone 3, 4.5 sun hours
    Installed price
    $5,800 to $7,500
    STC rebate
    $1,710
    Price after STCs
    $4,090 to $5,790
  • BrisbaneZone 3, 5 sun hours
    Installed price
    $5,200 to $6,800
    STC rebate
    $1,710
    Price after STCs
    $3,490 to $5,090
  • PerthZone 3, 5.3 sun hours
    Installed price
    $5,000 to $6,500
    STC rebate
    $1,710
    Price after STCs
    $3,290 to $4,790
  • AdelaideZone 3, 4.7 sun hours
    Installed price
    $5,300 to $7,000
    STC rebate
    $1,710
    Price after STCs
    $3,590 to $5,290

Installed prices before rebates are the city bands from our solar panel cost guide. The STC rebate is this year's certificate count for the city's zone at the current certificate price. Sun hours are from our postcode solar data for each city centre. State programs are not included.

Installers earn the Why Solar approval. They can lose it.

No retainers. No installer owns a piece of Why Solar. That matters, because it means we can drop them.

An installer earns the Why Solar approval by passing six checks before they see a single homeowner. After every match, one of our team calls you to make sure they turned up, quoted what they said they would, and treated you properly. Installers who don't measure up are removed from the network. Some already have been.

The city lists on this site are a different thing. They name established companies we have confirmed are trading and local, so you have a starting point for comparison. Being on a city list is not the same as being Why Solar Approved, and we don't accept payment for places on either.

The Why Solar Approved standard

Six checks every Why Solar Approved installer passes

A warranty is only as good as the company behind it. Before an installer earns Why Solar approval, they pass every one of these. Most don't.

Why Solar Approved badge: six checks, 2026

  1. Credentials

    Accreditation and licensing, current and genuine, checked rather than assumed.

  2. Staying power

    Years actually trading, and the financial stability to still be here in a decade to honour what they promise.

  3. Proof of work

    Real installations we can examine, not a folder of stock photos and slogans.

  4. The actual hands

    Who physically turns up to do the job, not the cheapest available subcontractor.

  5. What goes in

    Genuine, traceable components that match the quote exactly. No quoting German and fitting Chinese.

  6. How they handle trouble

    How they behave when something goes wrong. That, not the sales call, is the true measure of a company.

How to judge a solar installer yourself

Check the paperwork, not the badge on the van.
The people who design and install your system need Solar Accreditation Australia accreditation for your job to earn STCs, and the company selling it should be a New Energy Tech Consumer Code approved seller, which commits it to rules on sales practices, contracts and complaints. Ask for the accreditation numbers and look them up.
Look at how long the company has really traded.
A ten-year panel warranty and a twenty-five-year performance warranty are only as good as the company that honours them. ABN Lookup shows when the business registered and whether the name on the quote matches the legal entity. A new ABN behind an old-sounding brand is worth a question.
Find out who turns up.
Some retailers sell the system and hand the install to whichever subcontractor is cheapest that week. Ask whether the installers are employees, and whether the electrician who connects the system is licensed in your state.
Make the quote itemise everything.
Brand and model for the panels, inverter and battery, the number of panels, the mounting system, any switchboard work, the export limit your network has approved, and the STC discount. A quote that says "tier one panels" without a model number leaves room for a swap on the day.
Ask how they handle trouble.
Who do you call if the inverter faults in year three, how quickly do they come out, and who pays for the visit. How a company answers that tells you more than the sales pitch.

Our installer check looks a company up against our register of collapsed solar companies and the regulator records we track, and QuoteCheck goes through a quote you already have.

How matching works

  1. See your rebate

    Answer a few questions about your home and your power bill. It takes about 60 seconds, and you see the federal rebate your system would earn before anyone contacts you.

  2. One Why Solar Approved installer near you

    We place you with one installer that has passed all six checks and works in your postcode, matched to your home and what you want from the system.

  3. Your solar expert calls you

    Fifteen minutes with a solar expert before you sign anything: your rebate, what your quote should include, what to push back on, and whether a battery makes sense. The installer never cold-calls you.

  4. We check in after the job

    After every match, one of our team calls you to make sure the installer turned up, quoted what they said they would, and treated you properly. Installers who fall short lose the approval.

A printed solar quote, a pen and a phone on a kitchen table
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How we score installer profiles

When an installer has a profile on our site, our trust score assesses it against the same criteria. The city lists above are not scored: they run by years trading. Network membership is not a factor, and we don't accept payment for rankings. Our trust score blends 9 weighted factors:
Verification of licences
22%
SAA accreditation (or the older CEC record, counted once) and NETCC approved seller status
Insurance coverage
16%
Public liability and professional indemnity
Review quality
13%
Average rating of published reviews on our site
Time in business
11%
Years operating under the same name
Review volume
11%
Number of published reviews on our site
Transparency
9%
Accreditation and insurance both on the record
Service range
8%
Solar, battery, heat pump, EV charger
Coverage area
5%
Number of states and regions served
Company size
5%
Team size and operational capacity

Questions about choosing a solar installer

Who are the top 10 solar installers in Australia?
There is no official top 10 solar installers list in Australia. The rankings you see are either by volume, meaning who installed the most, or by survey, meaning who pleased the customers who answered, and neither tells you who will do the best job on your roof. Solar is a local trade: the right installer for a house in Penrith is rarely the right one in Perth, because the network, the export limit, the roof and the weather all differ. So we do not crown ten national names. We list established installers city by city, and we hold the one we match you with to the six checks of the Why Solar Approved standard: credentials, staying power, proof of work, the actual hands, what goes in and how they handle trouble.
Which company is best for solar installation?
The one that will still be trading when you need the warranty, sends its own licensed electricians and accredited installers, fits the exact components on the quote, and deals with problems properly when they come up. Price matters, but a cheap system from a company that disappears costs more in the end. Judge any quote on those points, check how long the company has traded under its current ABN and whether it is a New Energy Tech Consumer Code approved seller, and ask who will physically do the install.
Who is the most reputable solar company in Australia?
We do not name one company. Reputation in solar is local and it changes quickly: several of the country's biggest retailers have collapsed, and our register of collapsed solar companies lists 279 of them. A reputable installer has years of trading under the same ABN, an office near you, accredited installers of its own, a workmanship warranty of five years or more, and a record of fixing problems rather than arguing about them. Those are the things we check before an installer earns the Why Solar approval, and the reason an installer can lose it.
How do I check a solar installer is legitimate?
Look the company up on ABN Lookup and check how long its ABN has been active and whether the name matches the quote. Ask for the Solar Accreditation Australia numbers of the people who will design and install the system, and whether the company is a New Energy Tech Consumer Code approved seller. Then run the name through our installer check, which looks it up against our register of collapsed solar companies and the regulator records we track.

More on the collapses behind these answers: collapsed solar companies in Australia.

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