What Changed in Duro-Last Warranties? A Guide for Seattle Homeowners

Have you been told your flat roof comes with a "Duro-Last warranty," but nobody explained which one? Or did you read online that Duro-Last only offers 15 or 20 years of protection on your new roof?

If so, you're not alone. Some of that information is now out of date, and even a few of Duro-Last's own brochures haven't caught up yet. 

RoofSmart is a contractor certified by Duro-Last, so we keep track of these changes. It's important to us that our customers are able to easily stay up to date on this information.

In this article, you'll learn what changed for homeowners, what changed for commercial building owners, what the upgraded warranties require, and what to ask before you sign.

How does the Duro-Last warranty update impact residential homeowners?

Before 2026, Duro-Last's residential warranties were 15 or 20 years, and they were material-only. That means Duro-Last covered a defective membrane, but you paid for the labor to fix it. Those 15- and 20-year material warranties still exist (but they were reissued on forms dated 06.04.2025).

Here's what was added on forms dated 04.27.2026:

• 25- and 30-year residential material-only warranties: These are the same idea as the 15- and 20-year versions, just longer. They only cover materials (no labor or tear-off), and after a certain amount of time, the coverage is prorated.
• 20-, 25-, and 30-year residential NDL warranties: NDL stands for "No Dollar Limit." These warranties are ideal because they provide the most comprehensive coverage for a flat roof. They provide labor and materials for covered leaks, including leaks caused by the installing contractor's workmanship. Duro-Last's commercial NDL warranties exclude single-family homes, so this is new for homeowners. Because NDL warranties offer stronger coverage, they also have stricter installation requirements. Check out our PVC warranty article for more information on how NDL warranties work.
• A Residential Lifetime warranty: It lasts for the life of the original owner, but the coverage is for materials only, and it is prorated. If the owner isn't a person (for example, a trust or company), or the warranty is transferred, it becomes a fixed term based on how thick the membrane is. Labor isn't covered.

Duro-Last's main warranties page was updated on August 31, 2026 to show residential terms of 15, 20, 25, or 30 years. The Lifetime warranty appears in Duro-Last's specification library, not on that page. Be aware that some of the Duro-Last brochures and FAQ pages still describe only 15- and 20-year residential warranties, so you may see older numbers out there.

How does the Duro-Last warranty update impact commercial building owners?

In 2025, Duro-Last's parent company became Amrize, which is a spin-off from Holcim. Duro-Last's commercial warranty forms dated 06.04.2025 were reissued under Amrize Building Envelope LLC. For most commercial owners, this is a paperwork change:

• The same warranty families remain: Supreme, Ultra and Basic NDL warranties, plus material-only warranties.
• The company named on the warranty is now Amrize Building Envelope LLC (Duro-Last is a brand of Amrize).
• Newer forms list Tennessee law and courts instead of Michigan.
• On forms dated 04.27.2026, commercial material-only warranties now also come in 25 and 30 years.

If you have an older Duro-Last warranty that says "Duro-Last, Inc.," don't panic. Your existing warranty doesn't disappear because the parent company changed. Make sure that your paperwork is in order and keep it somewhere safe.

Why do upgraded Duro-Last warranties cost more?

Upgraded warranties like NDLs, 25- and 30-year terms, or lifetime warranties have stricter requirements to qualify, so the roof costs more to build to that standard. Here's where the cost comes from:

• Duro-Last system components: The warranty calls for Duro-Last parts throughout the roof, like tapered insulation, polyiso insulation, coverboard, and the specified fasteners and screws. You pay more for top quality materials.
• A required inspection: A Duro-Last quality assurance representative must inspect the roof before you can be approved for NDL coverage. There's typicallly a registration or inspection fee, and often you have to get multiple inspections throughout the roof installation process. 
• Ongoing care: Longer warranties require that you carefully follow Duro-Last's care and maintenance guide, and 25- and 30-year warranties require following a Duro-Last maintenance program during the term. This means regular cleaning, inspections, and maintenance, which will likely cost money. Plus, you might also need to keep up with repairs. 

We don't list fee amounts here because Duro-Last sets them, and they can change. 

Is an upgraded Duro-Last warranty worth it for my home?

It depends on how long you plan to stay and how much risk you want to carry (see how to choose a PVC warranty level for your home).

A material-only warranty protects you against a defective membrane. Many flat roof leaks trace back to installation issues, not the membrane itself having a defect. That's why an NDL warranty, which also covers leaks caused by the installer's workmanship, is a real step up. It's also why choosing the right installer matters more than any warranty.

If you're selling in a few years, a standard warranty may be all you need. If you plan to stay a long time, or you have a rooftop deck or a complex low-slope roof, an upgraded warranty can make sense. A meticulous roofing nerd can walk you through both options for your roof.

FAQs About Duro-Last Warranties

Did Duro-Last change its residential warranties?

Yes. Residential forms dated 04.27.2026 added 25 and 30-year material-only warranties, 20, 25 and 30-year NDL (labor and material) warranties, and a Lifetime warranty. The 15 and 20-year material-only warranties are still available.

What does the Duro-Last Lifetime warranty cover?

It lasts for the life of the original owner, material only, prorated. It doesn't cover labor or the contractor's workmanship. If the property is owned by a company or trust, or the warranty is transferred, it becomes a fixed term based on membrane thickness.

What does NDL mean?

NDL stands for "No Dollar Limit." An NDL warranty covers labor and material to repair covered leaks, including leaks caused by the installing contractor's workmanship. Duro-Last's new residential NDL warranties come in 20, 25 and 30-year terms.

Why does an upgraded warranty make my roof cost more?

Upgraded warranties have stricter requirements to qualify. The roof has to use Duro-Last system components like tapered insulation, polyiso, coverboard and the specified fasteners and screws, and it has to pass a required Duro-Last inspection with a registration or inspection fee.

What changed for commercial Duro-Last warranties?

Commercial warranties were reissued on forms dated 06.04.2025 under Amrize Building Envelope LLC, Duro-Last's new parent company. The warranty families (Supreme, Ultra and Basic) stayed the same. The company name and the governing state on the paperwork changed.

Is my old Duro-Last warranty still valid?

The parent company change doesn't cancel an existing warranty. Your coverage follows the terms on your own warranty document. If you can't find it, contact Duro-Last with your roof's address.

Can I transfer a Duro-Last warranty if I sell my home?

Many Duro-Last warranties can be transferred, but most require Duro-Last's written approval and a transfer fee, and some require an inspection. A transferred Lifetime warranty becomes a fixed term. Check your own warranty document for the exact rules.

Who can install a roof with a Duro-Last warranty?

Only a Duro-Last authorized contractor can install a Duro-Last warranted roof. RoofSmart is a Duro-Last authorized PVC contractor serving the Greater Seattle area.

Why do some websites still say 15 or 20 years?

Because some sources haven't been updated yet. As of October 2026, a few Duro-Last brochures and FAQ pages still describe only 15 and 20-year residential warranties, even though Duro-Last's warranties page and specification library show the newer terms.

Sources

• Duro-Last warranties page (updated August 31, 2026): duro-last.com/warranties
• Duro-Last specification library, residential and commercial sample warranties: specs.duro-last.com
• Residential Lifetime Limited Warranty sample (form dated 04.27.2026): PDF
• 20-Year Residential NDL Warranty sample (form dated 04.27.2026): PDF
• Basic 15-Year NDL Warranty sample, Amrize (form dated 06.04.2025): PDF
• Duro-Last Care and Maintenance Guide: duro-last.com/care
• Duro-Last press room, "Duro-Last is Now Part of Amrize": duro-last.com/press-room
• Amrize debut announcement (June 23, 2025): amrize.com

Want to know which Duro-Last warranty fits your roof?

Whether you own a Seattle home with a low-slope roof or a commercial building, we'll inspect your roof, explain your warranty options in plain English, and show you in writing what each one requires. No pressure, just honest options.

Duro-Last offers good quality, long-lasting roofing materials and they've expanded their warranty options to include 25- and 30-year warranties and NDL warranties to provide better coverge for their customers. 

Depending on the level of coverage your roof needs, you can choose a basic warranty or one with more comprehensive coverage options.

Talk to a roofing nerd or call (206) 487-4877.