Should I Replace My Roof Before Solar?

Replace the roof first if it is already leaking, near the end of its life, or has more than one layer of shingles that a roofer says should come off. Leave a sound roof in place if a roofer expects it to last about as long as you plan to leave the panels up, and the installer will flash and warrant the attachments. The panels are the easy part of this decision. The hard part is paying, years from now, to detach the array, reroof, and put the array back.

Solar modules are commonly sold with product and performance warranties on the order of 20 to 25 years or more. Asphalt shingle roofs often do not have that much life left when a homeowner starts shopping for solar, especially if the roof is already 15 years old or has storm damage. Those ranges are typical product terms, not a prediction for your house. A roofer who is on the roof can tell you more than a solar sales visit that never leaves the driveway.

Why the order matters

Most home arrays are attached through the roof covering into the structure. To replace the covering later, someone has to:

1. Shut the system down and coordinate with the utility if the interconnection has to be paused.
2. Remove modules, rails, and flashings.
3. Replace the roofing.
4. Reinstall the array, with new flashings, and inspect it again.
5. Turn it back on, sometimes with a new inspection.

That work has a real cost. Quotes for “remove and reinstall” vary by system size, roof height, equipment type, and who is allowed to touch the array under the warranty. Do not accept a single national price from a blog — including this one. Ask two local roofers and your installer for figures for your roof before you decide the order.

Doing the roof first means the array goes on a new covering, the flashings are installed once, and you are not scheduling a second project around an active system. Doing solar first can still be reasonable when the roof is young and the paper warranty and the visual condition agree.

If you might sell the house, a buyer’s inspector will look at both the roof and the solar paperwork. Selling a home with solar explains what buyers ask for. A roof that needs replacement, plus a leased system that is awkward to remove, is a harder listing than an owned system on a roof with life left.

What to have a roofer check

A solar installer is not a substitute for a roofing inspection. Ask a roofer, ideally one who is not also selling you the panels, to look at:

• Age and remaining life of the covering you have, not the age when it was “supposed” to last.
• Leaks, soft decking, and stained sheathing. Solar attachments need solid wood. Rotted decking is a roofing repair, not a bracket detail.
• Layers. Many jurisdictions limit how many shingle layers can sit on a roof. If you are already at the limit, the next roof is a tear-off.
• Flashing at chimneys, skylights, and walls. Solar does not fix those leaks, and mounts nearby can make a future repair harder.
• Valleys, dead valleys, and low-slope sections. Those areas are poor places for modules even when the shingles are new. The array layout should avoid them.
• Vent pipes and other penetrations that the array would cover. They may need to be moved. That is roofing work, and it should be in somebody’s scope before you sign.

Get the roofing opinion in writing, even if it is a short email: remaining life, repairs required before an array, and whether a tear-off is recommended. Hand that to each solar company so the proposals match the same roof.

If you are comparing installers, use how to compare solar companies and require each quote to say who does the roof repairs, who flashes the mounts, and whose workmanship warranty covers a leak at a mount.

How solar attaches, and who warrants a leak

On a shingle roof, the usual method is a flashed mount lag-bolted into a rafter, with the shingles worked back around the flashing. Tile, metal, and flat commercial roofs use different hardware. The wrong tile hook or a mount that pinches a metal seam can void a roof warranty even when the electrical work is fine.

Ask these as separate questions:

• Does the roof manufacturer still warrant the covering after third-party mounts are installed? Some require specific flashed products or an authorized installer. Get that from the roof warranty, not from the solar brochure.
• What is the solar company’s workmanship warranty for roof penetrations, for how many years, and does it survive if a different company removes the array?
• Who pays if the roof leaks at a mount in year three: the roofer, the solar installer, or you?
• Will the installer photograph the deck and the flashings before the modules hide them? Those photos help if there is a dispute.

Building-integrated products replace covering instead of sitting on top of it. They are a different scope from a racked array. American-made building-integrated solar is the standard product in the GoBien solar provider network. If someone proposes that product, ask how the roof warranty and the solar warranty interact, because they are no longer two separate layers.

Structure, not just shingles

The covering can be new and the frame still unsuitable. Modules, rails, and a snow or wind load add weight and uplift. A licensed installer should check structure, and some cities require a structural letter. You should not “eyeball” this from the attic and call it engineering.

Tell the installer about:

• A roof that was patched after a fire or a fallen tree.
• Additions that tied into the old frame.
• Long spans, visible sagging, or rafters that a previous remodel cut.
• Tile or slate, which is heavy before any solar is added.

If the structural fix is a sistered rafter or similar carpentry, that cost belongs in the project budget before you compare price per watt. A low price that assumes “no structural work” is not comparable to a bid that includes it.

Timing the two projects

If you replace the roof and go solar together:

• Decide who is the lead contractor. Roofers and solar crews often will not warrant each other’s work unless the scope is written down.
• Replace the roof, pass any roof inspection the city wants, then mount the array. Covering a brand-new roof with modules before the roofer signs off can hide problems.
• Match the interconnection paperwork to the final design. If the module count changes because a skylight or a chimney stays, the utility application has to match. How net metering works explains why the utility approval, not the sales proposal, sets the export credit.
• Do not size the system to a roof layout you are about to tear off and rebuild with different penetrations. How to size a home solar system starts from your kWh, then fits the array to the roof you will actually have.

If the roof can wait, write down the year you expect to reroof and ask the installer what removal and reinstall would involve then. Put that note with the contract. Future-you, or a buyer, will need it.

Should I reroof if the shingles are only a few years old?

Usually no. If the covering is new, the deck is solid, and the roof warranty allows the mounts the installer will use, replacing it again only to “start the clock” for solar is an extra project. Have a roofer confirm there is no hidden damage, and have the installer confirm the attachment is allowed under that roof warranty. Age on a calendar is less important than condition and the written warranty.

Who pays to remove solar panels when the roof is replaced later?

If you own the system, you hire that work unless your solar workmanship warranty or a separate service plan says otherwise. Read the contract. If a lease or power purchase agreement company owns the system, you generally cannot remove it yourself, and the contract will say who may touch it and what a removal costs. Those terms are a reason to know which financing structure you are signing. Compare them in solar financing options before you put an array on a roof you already plan to replace.

Can I put solar on a roof that needs a few repairs?

Yes, if the repairs are finished first and they are the kind a roofer will stand behind: replaced decking, corrected flashing, a patched section that is not under a future mount. Do not mount over an active leak, soft decking, or a third layer of shingles a local code will not allow. Small, completed repairs are not the same decision as a full tear-off. Get the repair invoice, and give every bidder the same “roof is repaired” starting point so the solar prices match.

Does a solar installer inspect the roof?

A careful installer looks at the roof for layout, shading, and a first opinion on condition. That visit is not a roof certification. Ask whether a structural assessment is included, whether they will pause the job if they find bad decking, and whether roofing repairs are in their license and their price or in a separate roofer’s contract. If the proposal is silent, treat the roof as an open item, not as “included.” The solar quote FAQ is a checklist you can mark up next to the proposal.

This page is general information for homeowners, not a roofing specification or legal advice. Local code, wind and snow loads, and warranty terms control your house.

When you are ready for a site-specific look, request a free energy analysis and mention the roof’s age. You can also read city notes in the solar guides and find a GoBien location.