Glossary

Amendatory endorsement

An add-on that rewrites parts of the base policy, usually to match a state's insurance laws, and that takes priority wherever it conflicts with the form.

Also called: state amendatory endorsement, special provisions endorsement, state amendatory

Insurers use one base homeowners form across many states, then attach amendatory endorsements to make it fit each state's law. ISO publishes them as "Special Provisions" endorsements for each state. A typical one changes cancellation and nonrenewal notice periods, the time allowed to sue, the appraisal or mediation language, or the wording of a state-mandated deductible or coverage. Insurers also issue their own amendatory endorsements to change the form mid-term or at renewal.

Where the endorsement and the base form conflict, the endorsement controls. A policy term that conflicts with state law generally yields to the law as well. That is why a general description of "the standard HO-3" can be wrong for your policy: the state endorsement may shorten a deadline or limit a payment that the base text does not.

Most people read the policy booklet and skip these pages. Find the forms and endorsements list on your declarations page, ask your agent for a copy of every listed form, and read the amendatory endorsement first. Two places it changes outcomes are the claim deadlines covered in deadlines to sue over a home insurance claim and the form-level differences explained in ISO homeowners forms and why your policy may differ.

Last reviewed October 10, 2026

In the index now

Related terms

Endorsement A written change attached to a policy that adds, removes or alters coverage, limits or conditions, and controls over the base form wherever the two conflict. ISO (Insurance Services Office) The industry organization, now part of Verisk, that drafts standard homeowners policy forms, rating data and fire protection grades that insurers use or adapt. Declarations page The summary page at the front of a policy listing the insured, the property, policy dates, limits, deductibles, premium, mortgage lender and attached forms. Suit limitation clause The policy condition that sets a deadline, often one or two years from the date of loss, for filing a lawsuit against the insurer over a claim. Rider A form added to a policy to change its coverage; in homeowners insurance, an everyday word for an endorsement such as scheduled jewelry or water backup.

Related guides

Endorsements, riders and floaters: what the words mean An endorsement is a written change to your policy, a rider is slang for one, and a floater insures listed items. How to read each on your declarations page. How to read your homeowners policy, section by section Read the declarations page and endorsements first, then definitions, Section I, Section II and conditions. A tour of the ISO HO-3 layout and its deadlines. ISO homeowners forms and why your policy may differ ISO publishes the standard homeowners forms, but your policy may use an older edition, an insurer's own wording or state endorsements. How to tell.