Solar panels and roof replacement have to be planned together, because the panels sit on the roof and the roof sits under the panels. If your roof is close to the end of its life, the usual sequence is to replace the roof first and then install the panels, so you are not paying to take down and put back an array on a roof that was about to be redone anyway. If the panels are already up, the roof job gets a few extra steps: someone qualified has to detach the array, the roof gets replaced, and the array is reset and reconnected afterward.
This guide walks through the order of work, how removal and reinstall are coordinated between trades, why penetrations and flashing deserve extra attention, and which warranty questions to settle in writing before anyone starts. We are roofers, not solar installers, so we stick to the roof side and say plainly where the solar company, the manufacturer or your building department has the final word. We will not tell you whether solar is right for you. That is a separate decision with its own math, and this page does not touch it.
Key takeaways
- A roof that is near the end of its service life is generally better replaced before panels go on, so the two jobs are not duplicated.
- If panels are already installed, the array typically has to be detached and reset by a qualified solar installer. The roofer does not handle the electrical work.
- Every mounting point is a hole through the roofing. The quality of the flashing at each one matters for decades, not just years.
- Two separate warranties are involved, the roofing system and the solar installation. Ask each company in writing how its warranty treats work done by the other.
- Panels make some roof work slower: inspection, repair and leak tracing all take more care when part of the surface is covered.
- Requirements for permits and inspections vary by city and county. Ask your building department or roofer what applies to your address.
Should you replace the roof before installing solar panels?
If the roof is aging, yes, that is the sequence most roofers and installers would point you toward, and the reasoning is simple. A solar array is mounted to the roof structure. Once it is up, the roofing beneath it is covered, hard to inspect and hard to work around. Replacing the roof later means the array comes off, waits, and goes back on, with labor on both sides of the roof job. Doing the roof first means the panels go onto a fresh surface, and the mounting hardware is flashed into new material.
"Near the end of its life" is a judgment call, and it is worth making with an inspection rather than a guess. Signs we look at from the ground and in the attic include granule loss in gutters and at downspouts, curling or cupping shingles, widespread cracked or brittle material, repeated leak repairs, and soft or stained decking seen from below. A roof does not have to be failing to be a poor host for a new array. If you expect the roofing to need replacement within the lifespan of the panels, the question is only when, and the best time to answer it is before installation.
A few situations change the answer:
- The roof is relatively new and in good shape. There is usually no reason to touch it. Your concern becomes the quality of the penetrations and flashing the solar installer will add.
- The roof is damaged by a storm. Sequence the storm repair or replacement first, then decide on panels. Policies differ about what they cover, so read yours and ask your agent.
- You are buying a home that already has panels. Treat the roof age and the array as one package when you evaluate it. Ask for the roofing records and the solar documents together.
- Your roofing material is unusual. Some materials, such as tile, slate or standing-seam metal, call for specific mounting hardware and methods. Ask both companies to confirm compatibility.
How is a roof replaced when panels are already on it?
The panels cannot stay in place during a tear-off. The roofing underneath them has to come off, the deck gets inspected and repaired, and new underlayment and shingles go on. So the array has to be disconnected and removed, then reset. This is commonly called a "detach and reset" or "remove and reinstall."
On jobs where we have worked with a solar installer, the pattern has been consistent: the solar crew comes first to take the array down and power it down safely, we replace the roof, and the solar crew returns to reinstall and hook everything back up. Our crews have also worked alongside solar crews at a roof where the array was lifted so the roof could be ready for a scheduled day, with reconnection right after. We stay out of the electrical work and the solar company stays out of the roofing. That separation matters for safety and for warranties.
Here is the general order of work, in the sequence we would expect to see on any roof with an existing array.
- Gather the documents. Collect the solar contract or lease, the installer's name, the system layout, the manufacturer information for the panels and racking, and any warranty paperwork. Ask your roofer to see these, because the mounting layout tells them where penetrations already are.
- Contact the solar installer first. Ask what they charge for detach and reset, how much notice they need, whether they require their own personnel for the work, and how long the system will be offline. If you lease the system, find out what the lease says about removal and who must perform it.
- Get a roof inspection with the array in mind. A roofer can inspect from the ground and the attic, note the age and condition of what can be seen, and tell you what is likely beneath the panels. Sections under the array may not be visible until it is removed.
- Agree on a schedule in writing. The roofer and the solar installer need to line up. If the array comes down on one day and the roofing crew is delayed by weather or material, the system stays offline until the roof is done. Ask each company what happens if the schedule slips.
- Detach the array. The solar installer powers down, disconnects and removes the panels and, depending on the system, the racking. This is their work.
- Replace the roof. Tear-off, deck inspection and repair, underlayment, flashing, shingles and ventilation components are handled as in any replacement. Our guide to why a roof estimate changes explains what can show up once the old roof is off.
- Reinstall and reconnect. The solar installer returns, resets the mounts, flashes each penetration, reinstalls the array and reconnects it. The mounting points are usually not in exactly the same spots as the old roof's holes, and the roofer and installer should agree on how the old holes are handled.
- Inspect, test and document. The installer confirms the system works. Both companies should give you paperwork describing what was done and when, because you will want those documents later.
Not every system works this way, and different installers have different methods. Treat the list as the shape of the process, not a script.
Who does what? A quick comparison
| Task | Typically handled by | What to confirm |
|---|---|---|
| Inspecting roof age and condition | Roofer | What can and cannot be seen with the array in place |
| Powering down, detaching and removing panels | Solar installer | Notice required, how long the system is offline, who is responsible for the equipment while it is down |
| Tear-off, deck repair, underlayment, shingles | Roofer | Decking handling, timing and weather plan |
| Flashing at old mounting locations | Roofer and solar installer | Who seals or removes old attachments, and who owns that result |
| Resetting mounts, reinstalling and reconnecting panels | Solar installer | New mounting layout and flashing method |
| Permits and inspections | Varies | Requirements vary by city and county; ask the building department |
| Final documentation | Both companies | Written record of work and how it affects each warranty |
Why do penetrations and flashing matter so much with solar?
A roof is a water-shedding surface, and every hole you make in it is a place water would like to enter. Most roof-mounted arrays attach to the roof structure through a number of mounting points, and each one needs to be flashed so water cannot follow the fastener down into the deck. That is a lot of potential leak sites on the roof, and a solar array is typically in place for a very long time.
Our crews see a few recurring issues around mounting points:
- Sealant used as the only protection. Sealant ages and cracks, especially in strong sun. Flashing that integrates with the roofing layers gives better long-term performance than sealant alone. Manufacturers of mounting hardware specify their own flashing methods.
- Mounts not placed in solid framing. A mount needs something solid to hold on to. Ask the installer how they locate rafters and what they do when the framing is not where the layout assumed.
- Old holes left open or half-closed. After removal, each previous attachment point needs to be properly addressed. A hole that was sealed once is not necessarily safe to ignore.
- Flashing detail on the roof edges around the array. Where the array sits close to valleys, ridges, vents or chimneys, there is less room to work and more chance for a mistake.
We write about flashing in general in what is flashing. The short version is that flashing is the metal or membrane that directs water around anything that sticks up through a roof, and panel mounts qualify.
If you are sequencing the work, the best moment to make flashing decisions is before the array goes up. If panels are already installed and you notice a stain on a ceiling near them, call a roofer. Do not try to inspect the roof yourself.
How do panels complicate roof repairs and inspections?
When part of a roof is covered by panels, three practical things change.
Access gets harder. A crew needs a safe place to stand and work. Panels can block movement across a slope, and the surface of a panel can be slick, hot or fragile. Walking near an array requires care, and some repairs cannot be completed until the panels are moved.
Visibility drops. The shingles under an array are hidden, and so is any damage to them. We see hail, wind and age damage on open areas of a roof and have to infer what is under the panels. The deck beneath them is the part we most want to see during a replacement.
Leak tracing takes longer. Water that enters near a mount can travel along the deck or a rafter before it stains a ceiling, as we describe in our guide to low-slope roofs and underlayment. With panels covering a slope, the roofer has to separate roofing problems from mounting problems, and the answer may require the solar installer to detach part of the array.
None of this means panels cannot coexist with a roof. It means a repair on a roof with an array often has two parties and a longer timeline, which is one more reason to keep a file of the documents we listed above.
What should you ask about warranties before work starts?
Roofing and solar each come with their own warranty. The roofing manufacturer's terms generally apply to the roofing materials and the conditions it requires, and workmanship terms apply to whoever installed them. The solar side has its own equipment and installation terms. Where the two meet, at the mounting points and at the roof the array sits on, it is easy for responsibility to fall into a gap.
We cannot tell you what any particular warranty says. We can tell you which questions to put in writing, and to get answers from the document itself rather than from a phone call.
Ask your roofer:
- Does the roofing manufacturer's warranty say anything about solar equipment, penetrations or work done by others on the roof?
- What does your workmanship warranty cover, and does it change if a solar installer later penetrates the roof?
- If you will reset the array after the roof is done, who flashes the new mounts, and under whose warranty?
- What documents will you give me at the end of the job?
Ask your solar installer:
- Does your installation warranty cover leaks at the mounting points, and for how long?
- Does the equipment manufacturer require anything of the roof, such as age, condition or material?
- If a roofer replaces the roof under the array, what do you require to keep your warranty in place?
- What do you charge for a detach and reset, and how long will the system be offline?
Ask yourself and your lender, lessor or agent, as applicable:
- If I lease or finance the system, who can authorize removal, and what does the contract say about roof work?
- Does my homeowners policy treat the array differently from the roof? Policies differ; read yours and ask your agent.
For more on warranty types, see roof warranties explained.
What common mistakes do homeowners make?
- Installing panels on a roof that is near the end of its life. This is the classic mistake, because the array has to come off for the roof job later.
- Assuming one company will handle both trades. Some companies coordinate both, but many do not. Confirm who is scheduling, who is responsible for what and who will answer if something leaks.
- Skipping the paperwork. Without the system layout and warranty documents, a roofer cannot tell where the mounts are or what the installer promised.
- Treating sealant as the fix. A dab at a hole is not a flashing detail. Ask what method will be used.
- Climbing up to check. Panels, shingles and slopes can all be hazards. Observe from the ground, and from the attic if it is safe, and call a roofer.
Frequently asked questions
Should I replace my roof before getting solar panels? If the roof is already old or showing signs of wear, that is generally the order that makes sense, because it avoids paying to remove and reinstall an array later. If the roof is in good condition, you may not need to. A roof inspection helps you decide, and the solar installer may have requirements of their own.
Can a roofer remove and reinstall solar panels? In most cases that work is handled by a qualified solar installer, not by the roofing crew. The roofer replaces the roof once the array is detached. Ask your solar company who performs the work and whether they require their own personnel, especially if the system is leased or under warranty.
Do solar panels void a roof warranty? It depends on the specific roofing warranty and on how the panels are installed. Some warranties address work by others or penetrations. Read the document for your roof and ask the manufacturer or your roofer. We cannot answer for a warranty we have not read.
How are solar panel mounts sealed against leaks? Each mount needs to be flashed so water cannot follow the fastener into the roof. Methods vary by mounting-hardware manufacturer and roofing type. Ask your installer which flashing method they use and what warranty applies to it.
Will panels make roof repairs harder? Often, yes. Panels limit access, cover the roofing beneath them and can make leak tracing slower. Some repairs require part of the array to be detached first. Plan for two parties and some extra time.
Do I need a permit to remove and reinstall solar panels? Requirements vary by city and county, and they may differ between the roofing work and the electrical work. Ask your building department, your roofer and your solar installer what applies to your address.
Planning a roof around panels?
If your roof is aging and you are weighing solar, or you already have panels and need to replace the roof, we can inspect from the ground and the attic, tell you what we see, and put our part of the job on a written, itemized estimate that you can share with your solar company. We will coordinate scheduling with your installer where we can, and we leave the electrical work to them. Call Total Roof Protection OKC at 405-415-5841 to schedule an inspection. An inspection describes the roof; it does not predict or replace any decision by your insurer or your solar provider. See our services page for the work we do.