Buying a house that already has solar? Check these before you sign.
Existing solar is usually a plus — but it comes with unknowns: the system's real age, whether the installer still exists, warranties that may not have transferred, and a premium feed-in tariff that almost certainly won't come with the house. This isn't a dealbreaker. It's a due-diligence checklist. Here's exactly what to ask for.
Reviewed by the Mission Green Energy Team · Updated July 2026
Is buying a house with solar
a good thing or a headache?
Mostly a good thing — treat it as a due-diligence checklist, not a dealbreaker. A well-installed system in good order is inherited value. The risks are all unknowns, and every one of them is answered by paperwork you can ask for before you sign.
Let's be plain: existing solar on a home you're buying is usually a benefit. You inherit hardware someone else paid for, and a decent system quietly trims the power bill from day one. What it is not is a reason to pay a big premium for the house, and it's not something to take entirely on trust either. The honest framing is that it's a checklist item — a thing to verify and document during the same due-diligence window you'd use for anything else on the property.
The four unknowns that actually matter are the system's true age and condition, whether the warranties transfer to you, whether the installer still exists to honour anything, and whether any premium feed-in tariff the seller boasts about will come with the house (spoiler: usually not). None of those needs to sink the deal. They just need answering. Work through the checks below, and if the seller can't produce the paperwork, that tells you exactly where to point a pre-purchase inspection.
First question:
how old is the system, really?
Age drives almost everything else — how much warranty is left, whether the inverter is near replacement, and how much the system is worth to you. And it's easy to establish if you ask for the right document.
The cleanest way to date a system is the certificate of electrical compliance (or safety) from the original install. For rebate purposes, the official installation date is the date that certificate was signed — the same date carried in the small-scale technology certificate (STC) record the system was registered under with the Clean Energy Regulator. Between that certificate, the original tax invoice and the inverter's commissioning data, you can usually pin the age down precisely.
If none of that survives, don't guess — an accredited electrician can read the manufacture dates off the panel and inverter labels and give you a fair estimate. Why it matters: panels commonly carry a 25-year performance warranty, but inverters are typically warranted for a much shorter window — often around 5 to 10 years depending on the brand and type. So a system that's, say, a decade old may still be generating happily while sitting right on the edge of an inverter replacement. That's not a reason to walk away; it's a number to factor into your offer.
- Ask for: the compliance/safety certificate, the STC paperwork, the original invoice, and the inverter's commissioning date.
- If those are missing: have an accredited electrician read the label dates and assess condition.
- Then price it honestly: an ageing inverter or tired panels belong in your negotiation, not your blind spot.
Do the warranties
actually come with the house?
Often yes — but rarely automatically, and the fine print varies by manufacturer. Some transfers must be registered within a set window; some installer workmanship warranties don't transfer at all. Get it in writing before you settle.
There are usually three warranties in play, and they don't behave the same way. Product warranties on the panels, inverter and any battery are attached to the equipment, so they generally carry over to you — but some manufacturers require the transfer to be registered, and a few want that done within a set period after the sale. Performance warranties (the panel's guaranteed output over 25 years) tend to follow the panels. Workmanship warranties from the installer are the tricky one: these are often tied to the original buyer and don't automatically pass to a new owner — and they're worthless anyway if the installer has closed.
The move here is unglamorous but decisive: get the warranty documents for the panels, inverter and battery, then confirm in writing with each manufacturer whether the remaining cover transfers and what you must do to keep it. Our companion guide, home battery warranties decoded, walks through where the throughput and cycle limits hide in a battery warranty — worth reading if a battery is part of the deal. And remember the hard truth from our guide to orphaned solar systems: a warranty is only as good as the company still standing behind it.
Who installed it —
and are they still around?
Two questions in one: was the installer accredited when they did the job, and do they still exist to service or warrant it? The first is a quick check; the second is the difference between a warranty and a nice piece of paper.
Find the installer's accreditation number on the compliance certificate or invoice, then check its status. Accreditation matters because a rebate-eligible system had to be installed by an accredited installer — and accreditation is a reasonable proxy for whether the job was done to standard. The scheme transitioned from the Clean Energy Council to Solar Accreditation Australia (SAA) on 29 May 2024, and SAA now runs a public accreditation status check on its website.
The bigger risk isn't accreditation, though — it's whether the installer's business still exists. If it's gone, you've inherited what's often called an orphaned system: not necessarily faulty, but one where warranty and service claims are harder, because you may have to chase manufacturers directly rather than one accountable installer. That's a manageable situation, and our detailed guides — orphaned solar systems in Australia and what to do when your installer went bust — cover the fallbacks. For a home buyer, the practical upshot is simple: an orphaned system is a reason to inspect and to negotiate, not necessarily to walk.
Will you inherit the seller's
generous feed-in tariff?
The ordinary market feed-in tariff, yes — you just sign up with a retailer. A legacy premium feed-in tariff, almost certainly no. Those old high-rate schemes are tied to the original account holder, not the panels. Don't price the house on one.
This is where buyers most often get burned by a hopeful assumption. A seller might mention a feed-in rate far above today's going rate — a hangover from a closed government premium scheme. Those rates were designed to reward early adopters and are tied to the original customer and premises, not to the equipment, so they generally do not pass to a new owner.
The two clearest examples:
- Queensland's 44c Solar Bonus Scheme (scheduled to close on 1 July 2028) does not transfer to a new owner or tenant unless that person is the seller's spouse. A new electricity account holder drops to the retailer's standard feed-in rate. (Source: qld.gov.au.)
- Victoria's Premium Feed-in Tariff ended entirely on 1 November 2024 — it's gone for everyone, seller and buyer alike. (Source: energy.vic.gov.au.)
So budget on the current market feed-in tariff, not a legacy rate — and if a rate is central to a home's advertised value, confirm the specifics with the relevant state scheme and your chosen retailer before you rely on it. If the seller has recently added a battery under an old premium arrangement, there's a separate trap worth understanding in our guide on the legacy feed-in tariff battery-upgrade risk.
The paperwork & access
to ask the seller for.
One request, before you sign, covers most of the checklist. Ask for the compliance certificate, the warranties, the install records and the monitoring login. Gaps aren't automatically red flags — but they tell you where to look.
Certificate of electrical safety
Called a CCEW in NSW, a Certificate of Electrical Safety in Victoria and the ACT, and an electrical safety certificate in Queensland. It's the licensed electrician's sign-off that the install is safe and compliant — and it dates the system.
Panel, inverter & battery docs
The product and performance warranty documents for each component, plus the installer's workmanship warranty. You'll need these to confirm — in writing with each manufacturer — what still covers you as the new owner.
Invoice, STC & install details
The original tax invoice, the STC paperwork showing the install date, and the installer's name and accreditation number. Together these establish age, who did the work, and whether it was rebate-eligible.
App & portal logins
Handover of the inverter/battery monitoring account. Real generation history tells you whether the system is actually performing — far more useful than a nameplate rating.
Backup & commissioning
If a battery is fitted, ask whether blackout backup was wired in (it's not automatic) and get the commissioning records — see will my battery work in a blackout.
Grid connection approval
The distributor's approval to connect the solar (and battery) to the grid. It confirms the system is legitimately connected rather than an unapproved, potentially non-compliant setup.
What changes when
the house also has a battery?
A battery raises the stakes — more money, more to check, and a common misconception about rebates. The core checks are the same, plus a few battery-specific ones.
An existing battery is genuinely valuable, but it needs its own attention. Batteries wear with use, so throughput and cycle history matter as much as age — a battery's warranty is usually capped by energy throughput or cycles as well as years, whichever runs out first, so a heavily-cycled unit may have less warranty life left than its age suggests. Ask for the warranty document and, if you can, the cycle or throughput data from the monitoring app. Our home battery warranties decoded guide shows exactly what to look for.
Two more things. First, blackout backup is not automatic — a battery only keeps the lights on in an outage if backup was specced and wired in at installation, so confirm it rather than assume it. Second, clear up a rebate misconception before it costs you: the federal Cheaper Home Batteries Program is a discount claimed at the time a new eligible battery is installed. You generally can't retrospectively claim a federal battery rebate on a battery someone else already had installed — so don't buy a house expecting to pocket a rebate on its existing battery. Check the current rules at energy.gov.au before relying on any figure, because program details change.
So — buy it, or be wary?
Here's the call we'd give a friend.
Buy with confidence when the paperwork checks out and the installer's still trading. Slow down and inspect when the system is old, undocumented, or orphaned. Either way, don't over-pay on a feed-in tariff you won't inherit.
Go ahead without much fuss when the seller can produce the compliance certificate, the warranties, the install records and a monitoring login; the installer is accredited and still in business; the system is reasonably recent; and any battery has clean commissioning and backup records. In that case existing solar is a straightforward plus and you should value it as inherited hardware, not pay a fresh-install premium for it. Slow down and get an accredited electrician to inspect when the system is more than a few years old, the paperwork is thin, the installer has vanished, or you simply can't verify what you're being told — a pre-purchase inspection is cheap insurance against an expensive surprise, and the honest rule of thumb is that the less paperwork the seller can produce, the more that inspection is worth. And in every case, refuse to price the home on a legacy premium feed-in tariff you almost certainly won't inherit. None of this should stop you buying a good home — it just stops you buying a solar problem you didn't see coming.
Buying a house with solar?
Your questions, answered.
No — existing solar is usually a plus, not a dealbreaker. It's simply a due-diligence item: something to inspect and document rather than something to fear or over-pay for. A well-installed system in good condition is a genuine benefit, because you inherit hardware the previous owner paid for. The risks are all about the unknowns — an unknown age, a possibly out-of-business installer, warranties that may not have been transferred, and a premium feed-in tariff that usually won't come with the house. The fix for every one of those is the same: ask for the paperwork before you sign, and if a system looks tired or undocumented, get it inspected by an accredited electrician. Treat it as a checklist, not a reason to walk away.
Ask the seller for the original installation paperwork. The installation date for rebate purposes is the date the certificate of electrical compliance (or the state equivalent) was signed, and that date also appears in the small-scale technology certificate (STC) record the system was registered under with the Clean Energy Regulator. The invoice and the inverter's own commissioning data can confirm it. If none of that is available, an accredited electrician can read manufacture dates off the panel and inverter labels and give you a reasonable estimate. Age matters because panels commonly carry 25-year performance warranties while inverters are often warranted for around 5 to 10 years — so an older system may be due for an inverter replacement you should factor into your offer.
Usually yes, but it is rarely automatic and the terms vary by manufacturer. Most panel, inverter and battery warranties are attached to the equipment and product rather than the person, so they can carry over to you — but some manufacturers require the transfer to be registered, sometimes within a set window after the sale, and some workmanship warranties from the installer are tied to the original buyer and do not transfer at all. Before you settle, get the warranty documents for the panels, inverter and any battery, confirm in writing with each manufacturer whether the remaining cover transfers and what you must do to keep it, and remember that a warranty is only as useful as the company still standing behind it.
The ordinary market feed-in tariff yes — you just sign up with a retailer as normal. A legacy premium feed-in tariff, generally no. Those old high-rate schemes are closed and are tied to the original account holder and premises, not the hardware. In Queensland, the 44c Solar Bonus Scheme (scheduled to end on 1 July 2028) does not pass to a new owner or tenant unless they are the seller's spouse — a new account holder drops to the standard rate. Victoria's Premium Feed-in Tariff ended entirely on 1 November 2024. So do not price a home on the assumption you'll inherit a 40-something-cent rate: budget on the current market feed-in tariff, and confirm the specifics with the relevant state scheme and your chosen retailer.
Find the installer's accreditation number on the original compliance certificate or invoice, then check its status. Solar Accreditation Australia (SAA) became the national accreditation scheme operator when the scheme transitioned from the Clean Energy Council on 29 May 2024, and SAA runs a public accreditation status check on its website. Accreditation at the time of install matters because a rebate-eligible system had to be installed by an accredited installer, and it's a proxy for whether the job was done to standard. If the installer's business no longer exists you have what's often called an orphaned system — not necessarily a faulty one, but one where warranty and service claims are harder, so factor that into your inspection and your offer.
Ask for the full handover pack: the certificate of electrical compliance or safety (called a CCEW in NSW, a Certificate of Electrical Safety in Victoria and the ACT, and an electrical safety certificate in Queensland), the original tax invoice, the panel, inverter and battery warranty documents, the STC paperwork showing the install date, the installer's accreditation details, and the login details for any monitoring app so you can see how the system has actually been performing. If a battery is fitted, also ask whether backup was wired in and get its commissioning records. Missing paperwork isn't automatically a red flag, but the gaps tell you where to point an inspection before you commit.
If the system is more than a few years old, undocumented, or you can't verify the installer, yes — a pre-purchase inspection by an accredited electrician is cheap insurance against an expensive surprise. They can check the panels, wiring, isolators and inverter for wear and safety, confirm the system is actually generating what it should, and flag whether an ageing inverter is nearing replacement. For a near-new, fully documented system from a still-trading installer, an inspection may be overkill. The honest rule of thumb: the less paperwork the seller can produce, the more an inspection is worth.
Where these figures come from.
Scheme dates, accreditation and compliance details on this page are drawn from official primary sources and were current as at 2026. Programs and rules change — confirm at the source before relying on a figure.
- Clean Energy Regulator — creating STCs, incl. installation date = date the compliance certificate is signed
- Solar Accreditation Australia — check an installer's accreditation status
- Clean Energy Regulator — SAA appointed accreditation scheme operator (scheme transitioned from the CEC on 29 May 2024)
- Queensland Government — 44c Solar Bonus Scheme (ends 1 July 2028; no transfer to a new owner except a spouse)
- Victorian Government — feed-in tariff (Premium Feed-in Tariff ended 1 November 2024)
- NSW Government — electrical compliance requirements (CCEW; BCNSW eCert from 1 July 2026)
- energy.gov.au — Cheaper Home Batteries Program (rebate claimed at time of a new eligible install)