A new roof comes with two separate warranties, and they are not interchangeable. One is the roofer promising their installation is sound. The other is the shingle manufacturer promising the material itself is not defective. They cover different failures, they are backed by different companies, and when a leak appears, it falls under one or the other depending on what caused it. Confusing the two is exactly how a homeowner ends up with a leak that nobody will pay to fix.
Here is what each warranty actually covers, why the one most people ignore is the one that matters most, and how to make sure both are real and in writing before you sign.
The quick version
The manufacturer warranty covers defects in the shingles. The workmanship warranty covers mistakes in how they were installed. Most new-roof leaks come from installation, not defects, so the workmanship warranty is the one that protects you day to day. You want both.
The manufacturer warranty: the maker's promise
This is the warranty most homeowners think of first, because it comes with an impressive number attached, often 25, 30, or even 50 years, or a "limited lifetime." It comes from the company that made your shingles, and it covers exactly one thing: a defect in the material itself. If the shingles were made wrong and fail early because of it, the manufacturer covers the cost of new material.
The important word is "material." This warranty does not cover a leak caused by how the shingles were nailed down, where the flashing was reused, or a valley that was sealed badly. Manufacturing defects are actually rare. That long number is real, but it protects you from the least likely problem.
The workmanship warranty: the roofer's promise
This is the roofer standing behind their own labor. If the crew installed something wrong, and it leaks because of that mistake, the workmanship warranty is what obligates them to come back and fix it at no charge. It is separate from the shingle warranty, it is set entirely by the roofer, and it is the one that should exist in writing in your estimate. Terms vary enormously, from a token one year to twenty-five years, which tells you a lot about how confident a roofer is in their own crew.
Why the workmanship warranty matters more than people think
Here is the fact that flips most people's priorities: the large majority of leaks on a brand-new roof come from installation errors, not defective shingles. A misplaced nail, reused flashing, a poorly cut valley, inadequate ventilation. Those are workmanship problems, and the manufacturer warranty will not touch them. So the warranty that actually covers the most likely way a new roof fails is the one homeowners pay the least attention to. Flip that. A long workmanship warranty from a roofer who will still be in business to honor it is worth more than the biggest number on the shingle wrapper.
“The shingle warranty protects you from the factory. The workmanship warranty protects you from the crew. On a new roof, the crew is the far more likely problem.”
The catch: manufacturer warranties are easy to void
That long manufacturer coverage comes with conditions, and missing them quietly voids it. Two catch people most often.
- Installation to spec: the shingles must be installed exactly the way the manufacturer requires, including matching underlayment and ventilation. A cutting-corners install can void the material warranty entirely.
- Registration: many enhanced manufacturer warranties only take full effect if the roofer registers the installation, often within a set window after the job. Skip it and you drop to a shorter, weaker default.
- Proration: most manufacturer warranties are prorated, meaning coverage shrinks every year. A "lifetime" warranty may pay only a fraction of replacement cost by year fifteen.
Ask who registers the warranty
A strong manufacturer warranty often depends on the roofer registering your specific installation. Confirm in writing that they will do it. An unregistered warranty can be worth far less than the brochure promises.
What to ask before you sign
Warranties are only as good as the questions you ask up front. Add these to the questions every roofer should be able to answer, and get every answer in writing:
- How many years is your workmanship warranty, and what exactly does it cover?
- Which manufacturer warranty do these shingles carry, and will you register it?
- Is the manufacturer warranty prorated, and how does the coverage change over time?
- What would void either warranty, and what do I need to do to keep them valid?
A warranty is only as solid as the roofer behind it
A twenty-five-year workmanship warranty means nothing if the roofer is gone in three. This is why the warranty conversation and the choosing-a-contractor conversation are really the same one. A long warranty is only valuable from a business established enough to still be around to honor it, which is one more reason to hire a verified, well-reviewed local roofer over the lowest bid from a crew you cannot trace.
Hommy is built around exactly that. Every roofer on the platform is verified, and each carries real ratings from other homeowners, so when a roofer offers you a long workmanship warranty, you can see the track record that tells you it will actually be honored.
