Is your roof right for solar? Check it yourself in five minutes.
Before anyone quotes you, you can check the five things that actually decide it — orientation, shade, space, material and age — from the ground, in about five minutes. Most Australian roofs pass. Some genuinely should wait, and we'll tell you which.
Reviewed by the Mission Green Energy Team · Updated July 2026
Can you really check
your own roof?
Yes — in about five minutes, from the ground, without a ladder. Five things decide whether a roof suits solar: orientation, shade, space, material & age, and structure. Most Australian roofs pass; the point of checking first is knowing what to flag so quotes are honest.
Sales-driven quoting works backwards: they decide you're buying, then make the roof fit the pitch. Checking your own roof first flips that. You'll know before anyone knocks whether your roof is a straightforward case, a "works, but design it properly" case, or one of the genuine wait cases — like a roof that needs replacing soon, which is better fixed before panels go on it.
The five checks below need nothing more than your phone, Google Maps and a walk around the yard. None of them requires you to go anywhere near the roof itself. And whether solar is worth doing at all for your household — separate from whether the roof can carry it — is covered honestly in our guide to whether solar is worth it in 2026.
Which way does
your roof face?
In Australia, north-facing roofs capture the most annual energy — but east and west are genuinely good too, and even south deserves honest modelling rather than an automatic no.
North-facing
The southern-hemisphere sweet spot. A north-facing roof sees the sun for the longest stretch of the day across the whole year, so it generates the most total energy. If your biggest clear roof face points north, orientation is a solved problem.
East & west-facing
East and west-facing panels produce typically 10–20% less annually than north — but they can better match morning and evening usage, when most households actually use power. East earns its keep at breakfast, west at dinner. Often the honest design splits panels across both.
South-facing
The compromise case. South-facing panels produce the least in Australia, so a south-only roof deserves honest modelling on your actual usage before you commit — not a brochure assumption either way. Sometimes it stacks up, sometimes the honest answer is a smaller system or none.
How to find your orientation in under a minute: open the compass app on your phone, stand in the backyard facing the main roof slope, and read the bearing — or simply find your house on Google Maps, where north is always the top of the screen. Whichever roof face points closest to the top of the map is your north face. That's it. You now know more about your roof than some quote-mills will ever ask.
What's shading
your roof?
Walk outside and look up: trees, neighbouring buildings, antennas, chimneys and flues all cast shadows — and when the shade falls matters as much as whether it falls at all.
Shade is the quiet killer of solar output, and it's the check quote-mills most often skip because it can't be seen from a satellite photo alone. Do a slow lap of the house and note three things:
- What casts shade — trees (including the neighbour's, and remember they keep growing), two-storey homes next door, antennas, chimneys, flues and roof plumbing.
- When it falls — morning shade mainly hurts east-facing panels; afternoon shade hurts west-facing ones. Shade that clears by mid-morning is a very different problem to shade that sits on the roof from 2pm onwards, right when a west array would be earning.
- The season — the winter sun sits lower in the sky, so shadows stretch longer in exactly the months your panels are already producing less. A roof that looks clear in January can be part-shaded through July.
The honest note on technology: modern optimiser and microinverter systems can mitigate shading impacts — they stop one shaded panel dragging down the whole string — but they never erase shade. A shaded panel still produces less; the electronics just contain the damage. A clear roof is always preferable, and if your roof has real shade, that's a design conversation to have openly with your installer, not a problem to hide behind a hardware upsell. Our is-solar-worth-it guide covers how shade feeds into the payback maths.
Is there enough
clear roof space?
As a rule of thumb, a typical residential panel occupies roughly 2m² of roof — so the space you need scales with the panel count, and your designer confirms the exact fit.
You don't need to measure your roof with a tape. Look at your house on Google Maps and ask one question: is there a decent stretch of clear, unbroken roof — ideally on the north, east or west faces you identified in Check 1 — or is the roof carved up by vents, skylights, antennas, dormers and valleys?
Two honest notes on space:
- Don't guess a panel count from your roof area. A typical residential panel occupies roughly 2m², but panels also need clearances at roof edges and around obstructions, and the workable layout depends on the exact shape of each roof face. Your designer confirms the real fit — any "your roof fits exactly N panels" claim made sight-unseen is a guess dressed up as a fact.
- Complex, multi-plane roofs cost more to design well. Splitting panels across several small faces can absolutely work, but it takes more racking, more careful stringing or microinverters, and more labour — and that shows up in the quote. That's not a rip-off; it's the honest cost of a complicated roof. A quote that's suspiciously cheap for a complex roof usually means nobody actually designed it.
The better starting point is the other way around: work out what size system your usage actually needs, then let the designer confirm whether your roof can carry it — and if it can't, whether a slightly smaller system still does the job.
What's your roof made of —
and how old is it?
Tile, Colorbond and slate are all workable — material almost never rules solar out. Age is the one that does: a roof that needs replacing soon should be fixed before the panels go on.
Colorbond & metal
Usually the most straightforward roof to mount solar on — clean fixing points, no fragile surfaces. If you have a Colorbond roof in reasonable condition, the material check is done.
Tile
The most common Australian roof, and completely workable. Tiles take more care during installation — brackets go under the tiles, and the odd cracked tile gets replaced along the way — which is routine for an accredited installer, not a red flag.
Slate
Workable, but specialised. Slate is brittle and unforgiving, so it needs an installer with genuine slate experience, and the labour side of the quote will honestly reflect that. Say up front that the roof is slate so the quote is real.
Now the check that actually disqualifies roofs — age and condition. Panels typically stay on a roof for decades. If the roof underneath will realistically need replacing within roughly 5–10 years, the honest sequence is: do the roof first, then the solar. Removing a solar system so the roof under it can be replaced — and reinstalling it afterwards — costs real money, and it's an entirely avoidable bill. A seller chasing this month's install target won't raise this; we will, because "wait until the roof's done" is sometimes the right answer.
You don't need to diagnose the roof yourself (and please don't climb up to try). From the ground, look for slipped or cracked tiles, visible rust streaks on metal, or sagging lines — and if the house is older and you simply don't know the roof's condition, have a licensed roofer look at it before you collect solar quotes. We install on tile and Colorbond homes every week across Melbourne and Sydney, and the jobs that go smoothly are the ones where the roof's condition was known before the design was drawn.
Will the structure
need checking?
For most homes, no — solar is installed on Australian roofs of every era, every day. But very old roofs, or roofs with known movement or damage, may need a professional assessment before panels go on.
This is the one check you can't finish yourself, and we won't pretend otherwise: we're not going to give structural advice on a web page, and neither should anyone else. What you can do in your five minutes is flag the triggers. If the house is very old, if the roof framing has ever been repaired or fire- or water-damaged, if there's visible sagging, or if a previous trade has ever raised an eyebrow at the roof space — write it down and say so up front.
A good installer treats that information properly: the site assessment looks at the roof and its framing, and where there's genuine doubt, a qualified professional assesses the structure before any racking is designed. That's a normal, unremarkable step — not a deal-breaker, and not a cost anyone should spring on you after the deposit. What you're screening for here isn't "can my roof ever have solar", it's "does my quote need to include a proper look first". And as with everything on this page: all of this happens through licensed, accredited people on proper safety gear — never through you on a ladder.
Where can you get an estimate
that isn't selling you anything?
Before quotes, it's worth seeing what a neutral tool says your roof could do. There's a free, government-backed one — and yes, we're pointing you to it even though it doesn't mention us.
SunSPOT is a free, not-for-profit solar calculator backed by the NSW Government. You enter your address, it looks at your actual roof from aerial imagery, and it gives an independent estimate of solar potential and indicative savings — with no installer, no lead form ambush, and nothing to buy. It's a genuinely useful sanity-check to run before anyone quotes you: if a salesperson's numbers are wildly rosier than the neutral tool's, ask them why.
It's an estimate, not a design — it can't see your switchboard, your usage pattern or your roof's condition up close. But walking into a quote conversation with a neutral baseline changes the dynamic entirely. Pair it with our honest take on whether solar is worth it in 2026 and you'll be a harder person to oversell — which is exactly how we like our customers.
What should you tell installers
so the quotes are real?
Hand over what your five-minute check found, and you turn generic quotes into address-specific ones — and expose anyone who quotes without asking.
When you request quotes, volunteer this up front:
- Orientation: which way your main clear roof faces (north / east–west / south).
- Shade: what casts it and when — morning, afternoon, and whether it's a tree that will keep growing.
- Roof type and age: tile, Colorbond or slate; roughly how old; anything you spotted from the ground; and whether a roofer has assessed it.
- Complexity: single big face, or multiple small planes.
- Your usage: when your household actually uses power — which drives what size system you need far more than your roof area does.
Then watch what comes back. A designer who uses that information will quote a layout for your roof; a lead-mill will send the same 6.6kW PDF it sends everyone. Knowing the difference — and how to read line items, panel layouts and the weasel words — is its own skill, and we've written it up honestly in how to read a solar quote.
So — is your roof right for solar?
Here's the honest wrap-up after the five checks — including the cases where the right answer is "fix the roof first" or "model it before you commit".
If your roof has a reasonably clear north, east or west face, no heavy shade, and it's in sound condition — which describes most Australian homes — your roof is right for solar, and the real question shifts to sizing it honestly and choosing who installs it. If your roof is heavily shaded or south-only, it's not an automatic no, but it is a "model it on real usage before you spend a cent" case. And if the roof needs replacing within the next five to ten years, the honest answer is the one nobody selling panels this month wants to give: do the roof first, then come back — solar will still be here.
Is my roof suitable for solar?
Your questions, answered.
You can check the five things that matter in about five minutes, from the ground or online — no ladder involved. First, orientation: in Australia a north-facing roof captures the most annual energy, and east or west still works well. Second, shading: look for trees, neighbouring buildings and antennas that shadow the roof, and note whether the shade falls in the morning or the afternoon. Third, space: a reasonable stretch of clear, unbroken roof. Fourth, material and age: tile, Colorbond and slate are all workable, but a roof that needs replacing soon should be fixed first. Fifth, structure: very old roofs may need a professional assessment. If your roof passes the first four, get a free assessment and mention anything you spotted so the quote reflects your actual roof — and never climb up to check; everything here can be seen from the ground or on Google Maps.
North-facing is best. Because Australia is in the southern hemisphere, a north-facing roof captures the most solar energy across the whole year. East and west-facing roofs still work well — they produce typically 10–20% less annually but can better match morning and evening usage, which is when many households actually use their power. South-facing is the compromise case: it produces the least and deserves honest modelling on your real usage before you commit, rather than a brochure assumption. You can find your orientation in seconds with your phone's compass app standing in the backyard, or by finding your house on Google Maps — north is always the top of the map.
Yes — an east-west roof is a genuinely workable option, not a consolation prize. Panels facing east and west produce typically 10–20% less over a year than the same panels facing north, but east panels generate more in the morning and west panels more in the afternoon and evening. If your household uses most of its power at breakfast and dinner time, that spread can match your usage better than a north-only array and lift the share of solar you actually use rather than export. The honest way to decide is to have the design modelled on your real usage pattern, which is what a proper assessment does — east-west changes the shape of your solar day, not whether solar is worth doing.
Yes — tile, Colorbond and slate roofs are all workable for solar in Australia. Colorbond and other metal roofs are usually the most straightforward to mount on. Tile roofs are very common and completely fine, though they take more care during installation and occasionally a cracked tile needs replacing along the way. Slate is workable too but more specialised, so expect the labour side of the quote to reflect that. The material itself almost never rules solar out — what matters far more is the age and condition of the roof underneath, and that the work is done by an accredited installer who mounts and seals everything properly for your specific roof type.
If your roof will realistically need replacing within roughly five to ten years, do the roof first. Solar panels are typically on the roof for decades, and taking a system off so the roof underneath can be replaced — then reinstalling it — costs real money and is an entirely avoidable bill. Most quoting processes will not warn you about this; it is exactly the kind of thing a sales-driven process skips past. If you are not sure about the roof's condition, have a licensed roofer look at it before you get solar quotes — never climb up to inspect it yourself. A sound roof under new panels is one of the cheapest pieces of insurance in the whole project.
It depends on the system size you land on, but as a rule of thumb a typical residential panel occupies roughly two square metres of roof, so the space you need scales with the panel count — and your designer confirms the exact fit around vents, skylights, antennas and the clearances required at roof edges. A simple, single large roof face is the cheapest to design for. Complex or multi-plane roofs can still work well by splitting panels across sections, but they take more design care and that can show up in the price. Rather than guessing a panel count from your roof area, work out what size system your usage actually needs first, then let the designer confirm whether your roof can carry it.
Where to verify this for yourself.
This page deliberately stays qualitative — orientation, shade and roof condition are things to check for your address, not averages to quote. These independent sources let you verify it without taking our word.