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Law and policy

Significant harm

A threshold in UK law (Children Act 1989) at which compulsory state intervention into family life is justified. Defined as ill-treatment or impairment of health or development.

Significant harm is the legal threshold in the Children Act 1989 at which compulsory state intervention into family life is justified, covering ill-treatment or serious impairment of a child's health or development.

In plain English

A threshold in UK law (Children Act 1989) at which compulsory state intervention into family life is justified. Defined as ill-treatment or impairment of health or development.

Why it matters

The phrase signals when a case moves from voluntary support into formal child protection. There is no fixed checklist; professionals weigh severity, frequency, and impact on the child. Understanding it helps families follow what social workers are doing.

Sources

Frequently Asked Questions

This is practical educational content to support families. For case-specific concerns about a child's safety, contact the NSPCC helpline on 0808 800 5000 or your local safeguarding team.

Last reviewed: 2026-05-17