Flue liner requirements for new builds
250 °C
Flue liners must be selected based on the expected flue gas temperature; for temperatures unlikely to exceed 250°C, requirements for gas flues apply, while for higher or unknown temperatures, solid fuel flue pipe standards are used
Flue liners must be selected based on the expected flue gas temperature; for temperatures unlikely to exceed 250°C, requirements for gas flues apply, while for higher or unknown temperatures, solid fuel flue pipe standards are used. Flexible flue liners are generally not permitted for new build constructions, requiring rigid systems for durability and safety.
Basis in regulation
How to check it on site
Verify that rigid flue liners are installed and are appropriate for the anticipated flue gas temperatures of the connected appliance.
Common failure
Incorrect specification of flue liner material for the appliance type or attempting to use flexible liners in new build situations.
Last updated 23 August 2026. This is our editorial summary of publicly available regulation, not building control approval or a warranty determination.