AEC definitions

What Is a Construction Warranty?

Last reviewed: September 2026

A construction warranty is the contractor's obligation to repair work that does not conform to the contract, for the period the contract states, often one year from substantial completion. Manufacturer warranties on a roof or a chiller are additional. They do not replace the contractor's duty, and the contractor's duty does not replace a manufacturer warranty the spec required.

Contractor correction
Often one year from substantial completion, by the general conditions
Special warranties
Longer terms specified for systems such as roofs
Starts
When the contract says, commonly substantial completion
Not covered
Owner damage, abuse, and ordinary maintenance
Closeout
Special warranty documents are deliverables
Separate from
A manufacturer warranty the owner may also hold

Definition

Warranty

The general conditions describe the correction period and how the owner gives notice. Special warranties in the specifications, such as a 20-year roof warranty, are products the contractor must deliver at closeout. The clock, the transferability, and whether the owner is the beneficiary have to match the spec. A warranty is not a maintenance contract. Damage, abuse, and normal wear are outside it. A defect in the work is inside it. Calling the manufacturer for a workmanship leak wastes the correction period.

In depth

The correction period is a contract duty

The owner notifies the contractor of nonconforming work. The contractor corrects it at their cost. If they do not, the owner can correct and charge back, following the clause. The period is not a limit on latent defects where the law gives a longer time. It is a contractual callback window.

Extended warranties for work corrected near the end of the period should be stated, so a repair in month 11 is not warranted for only a month.

Spec warranties are collected at closeout

Roofing, waterproofing, equipment, and coatings often require a manufacturer warranty in the owner's name, for a term, with no dollar cap or with a stated cap. The submittal and the closeout binder both need the executed form, not a sample.

A warranty that excludes the actual installation method is not the warranty the spec bought. Read the exclusions before you accept the paper.

Know the date

Substantial completion usually starts the contractor's period. Phased completion may start it building by building. Manufacturer warranties may start at shipment, startup, or substantial completion. Write the date in the closeout log or the argument will be about calendars.

Early occupancy can start a clock if the contract says so. Check before the owner moves in.

Warranty is not operations

Filters, lamps, and abuse are maintenance. A failed seal in year one is a callback. The O&M manual tells the owner how to maintain.

The warranty tells the contractor what they must still fix. Mixing them produces angry service calls.

Examples

Warranty on a real project

  • 01

    Substantial completion is in March. In November the owner notifies the contractor of a leaking joint. The correction-period clause requires the contractor to repair it.

  • 02

    The roofing spec requires a 20-year manufacturer warranty in the owner's name. Closeout includes the executed warranty, not a brochure.

  • 03

    A broken window from a move-in cart is not a warranty item. The contractor's installation defect next to it is.

FAQ

Frequently asked questions

The contractor's promise to correct work that does not meet the contract, for a stated period. Specifications may also require longer manufacturer warranties for particular systems.

Often one year from substantial completion under standard general conditions. The project contract controls. Special warranties in the specifications can be longer for specific systems.

The contractor corrects defective work. The manufacturer warrants its product under its own form. The owner may need both. One does not automatically satisfy the other.

When the contract or the warranty form says. For the contractor, that is commonly substantial completion. Manufacturer warranties may use a different start, which the spec should align.
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What Is a Construction Warranty? | Nomic