A new roof usually comes with two warranties. The manufacturer's warranty covers defects in the roofing materials. The contractor's workmanship warranty covers mistakes in how the roof was installed. Most roof failures in the first ten years come from installation, not defective materials, so the workmanship warranty and the company behind it matter more than most homeowners realize.
Here is how each one works, what voids them, and what to ask before you sign a roofing contract.
The manufacturer warranty: coverage for the materials
Every major shingle, tile, metal, and membrane manufacturer warrants its products against manufacturing defects. If a shingle fails early because it was made wrong, the manufacturer covers it under the terms of the warranty.
A few things to know about manufacturer warranties:
- "Lifetime" rarely means what it sounds like. Many shingle warranties are called lifetime but are prorated. Full coverage lasts for an initial period, often around 10 years, and then the coverage drops each year after that.
- Basic warranties cover materials only. On a standard warranty, the manufacturer may replace defective shingles but not pay for the labor to tear off and reinstall them. Labor is often the bigger part of the bill.
- Enhanced warranties cost more and require a certified installer. Manufacturers offer upgraded system warranties that extend full coverage, include labor, and in some cases cover installation errors. These are only available when a contractor certified by that manufacturer installs a complete system of the manufacturer's components.
For example, GAF's top-tier system warranties are only available through its certified contractors, and the strongest of them includes manufacturer-backed coverage for workmanship as well as materials. Other manufacturers have similar programs.
The workmanship warranty: coverage for the installation
The workmanship warranty is the contractor's promise that the roof was installed correctly. If flashing was installed wrong, nails were placed in the wrong spot, or ventilation was not done right, this is the warranty that pays to fix it.
Workmanship warranties vary widely from contractor to contractor. Some cover one or two years. Some cover ten or more. The length matters, but so does a question most people never ask: will this company still be in business when I need it?
A 10-year workmanship warranty from a roofer who closes in three years is worth nothing. That is not a hypothetical in Butte County. After every big storm or fire, out-of-area crews show up, do a lot of work quickly, and leave. When those roofs have problems, homeowners have no one to call.
Butte Roofing has been family-owned and operated here since 1950. We are not going anywhere, and we stand behind the roofs we install.
Why installation matters so much
Shingles and tile are tested and manufactured to tight standards. Installation happens on your roof, in the heat, by whoever shows up that day. That is where most problems start.
Common installation mistakes that cause early failures:
- Nails placed too high, too low, or overdriven
- Step and counterflashing skipped or replaced with sealant
- Reusing old flashing and pipe boots that are already worn
- Too little attic ventilation, or mixed vent types that work against each other
- Wrong underlayment for the roof slope or material
- Skipping drip edge, starter strips, or ice and water barrier in valleys
Many of these also void the manufacturer warranty. Shingle manufacturers spell out their installation requirements, including ventilation, and a roof that does not meet them may not be covered. We explain why ventilation is one of those requirements in why attic venting matters.
What can void a roof warranty
Read the fine print on any warranty you are given. Common exclusions and voiding conditions include:
- Improper installation that does not follow the manufacturer's instructions
- Mixing components from different brands when a system warranty requires matched products
- Poor attic ventilation
- Unauthorized repairs or modifications, such as other trades cutting into the roof
- Foot traffic damage from solar installers, satellite crews, or painters
- Lack of maintenance, especially on commercial and low-slope roofs where documented maintenance is often required
- Not registering the warranty within the required time
- Weather beyond the rated limits, such as wind speeds above what the product is rated for
If you plan to add solar, talk to your roofer first. Panel installation means drilling through the roof, and how it is done affects your coverage. Our article on solar panels and your roof covers what to ask.
Does a roof warranty transfer when you sell?
Often, yes, with conditions. Many manufacturer warranties allow one transfer to a new owner, sometimes with a shortened coverage period or a transfer fee, and usually with notice to the manufacturer within a set time after the sale. Workmanship warranties may or may not transfer depending on the contractor.
A transferable warranty is a real selling point. Buyers and their inspectors ask about roof age and coverage. Keep your warranty paperwork, permit record, and installation photos together so you can hand them over at closing. Our guide to roof inspections when buying or selling in Chico covers the rest of that process.
Commercial roof warranties
Commercial roofs have their own warranty types. The strongest is a no-dollar-limit (NDL) warranty, which covers both materials and labor for the full term with no cap on repair costs. These require a certified contractor, a manufacturer inspection at completion, and documented maintenance over the life of the roof. We offer NDL warranties up to 30 years on qualifying commercial systems. Learn more on our commercial roofing page.
Questions to ask before you sign
When you compare roofing estimates, ask each contractor:
- Which manufacturer warranty comes with this roof, and is it the basic or an enhanced system warranty?
- Does the manufacturer warranty cover labor, and for how long at full coverage?
- How long is your workmanship warranty, and is it in writing?
- Are you certified by this manufacturer, and does that certification change the warranty I get?
- Who registers the warranty, and when will I get the paperwork?
- Does the warranty transfer if I sell the house?
- What maintenance do I need to do to keep coverage?
- How long has your company been in business here?
Also confirm the contractor's license with the California Contractors State License Board at cslb.ca.gov before you sign anything. It takes two minutes.
The bottom line
A roof warranty is a promise. The materials warranty is a promise from a manufacturer. The workmanship warranty is a promise from the people who were on your roof. Both matter, but only one depends on who you hire.
If you are planning a new roof and want straight answers on what is covered, contact us for an estimate. We will walk you through the warranty options for your roof in writing. Learn more about our residential roofing services.
Frequently Asked Questions
What is the difference between a manufacturer warranty and a workmanship warranty?
A manufacturer warranty covers defects in the roofing materials. A workmanship warranty is the contractor's promise that the roof was installed correctly and covers installation errors. Most new roofs come with both.
Does a lifetime roof warranty really last a lifetime?
Usually not at full value. Many lifetime shingle warranties are prorated, with full coverage for an initial period and reduced coverage after that. Read the terms to see how long full coverage lasts and whether labor is included.
What voids a roof warranty?
Common causes include improper installation, poor attic ventilation, mixing brands on a system warranty, unauthorized repairs or roof penetrations, lack of required maintenance, and failing to register the warranty on time.
Does my roof warranty transfer if I sell my home?
Many manufacturer warranties can be transferred once, often with notice and sometimes a fee or shorter coverage. Workmanship warranty transfers depend on the contractor. Ask before you sign.
Why does the roofing company's history matter for a warranty?
A workmanship warranty is only as good as the company behind it. If the contractor goes out of business, there is no one left to honor it. A long local track record is one of the best signs a warranty will mean something.
