Fire Stopping Requirements Under the Building Regulations

Fire stopping is a legal requirement under the Building Regulations in England and Wales, and under equivalent legislation in Scotland and Northern Ireland. Yet it remains one of the most consistently underprovided elements of building construction and refurbishment. This guide explains what the regulations require, who is responsible, and the consequences of non-compliance.

The Regulatory Framework

The primary requirement comes from Approved Document B (ADB), which supports Requirement B3 of the Building Regulations 2010. B3 requires that spread of fire within a building is inhibited. ADB sets out compartmentation requirements for different building types and explicitly requires that penetrations through fire-rated elements — for pipes, conduits, ducts, cables or other services — must be fire stopped to maintain fire resistance.

What Must Be Fire Stopped?

• Plastic pipes through fire-rated floors and walls — require intumescent collars or wraps
• Metal pipes — conduct heat; require fire stopping to prevent heat transfer
• Electrical cables and cable bundles through fire-rated elements
• Cable ducts, conduits and trunking
• Mechanical ventilation ductwork — typically requires intumescent fire dampers
• Any void created through a fire-rated element by building works

The Fire Safety Act and Building Safety Act

The Fire Safety Act 2021 and Fire Safety (England) Regulations 2022 expanded duties on responsible persons in multi-occupied residential buildings. The Building Safety Act 2022 created an enhanced regulatory regime for higher-risk buildings (18m or above or 7+ storeys). Maintaining fire compartmentation — including fire stopping — is a core obligation under all these regimes.

Who Is Responsible?

Under CDM 2015, the principal contractor is responsible for ensuring fire stopping is installed and inspected before elements are covered over. Once a ceiling is boarded or a wall plastered, uninspected fire stopping is inaccessible and defects are built in permanently. Best practice is photographic documentation of every sealed penetration as part of the project record.

BritCut carries out fire stopping installation and surveys across the UK. Call us on 01322 221533 or request a free site survey. View our fire stopping locations page.