A service guarantee is a promise from a contractor to come back and fix their own work. A warranty is a separately structured product issued by a dedicated entity that exists independently of the contractor. Both are valid in the right context, but they protect very different things — and they fail in very different ways.
The corporate structure problem
A contractor's lifetime guarantee depends on the contractor still being in business. In an industry where the average foundation company doesn't survive a generation, that's a fragile assumption. A dedicated warranty entity is structured to outlast individual jobs and individual companies. Coverage continues even if the remediation crew rebrands, dissolves, or changes ownership, subject to the terms of the issued policy.
The transfer problem
Most service guarantees void at closing or require a re-inspection fee to move to the new owner. AFW's policy is bound to the property and transfers automatically. That difference is the entire reason a warranty shows up on a closing statement and a guarantee does not.
The exclusion problem
Industry-standard service guarantees often exclude exactly the mechanisms that cause settlement: soil movement, drought, "acts of God," changes in drainage. A foundation warranty designed for NWA's cherty-clay belt has to cover those mechanisms — otherwise it's covering nothing that ever happens.
How to compare two pieces of paper
Read the issuing entity. Read the transfer clause. Read the exclusions. If the entity is the contractor, the transfer triggers a fee, and the exclusions include soil movement, what's in your hand is a service promise. If the entity is separate, transfer is automatic, and settlement is the named coverage, you have a warranty.
Curious how AFW scores against the table? See the head-to-head on the homepage comparison section.