Under new regulations that came into effect from 1 October 2008, fitting, altering or replacing an external flue, chimney, or soil and vent pipe is normally considered to be permitted development, not requiring planning consent, if the conditions outlined below are met:
• Flues are allowed if less than one metre above the highest part of the roof.
• If the building is listed or in a designated area even if you enjoy permitted development rights it is advisable to check with your local planning authority before a flue is fitted.
• In a designated area the flue should not be fitted on the principal or side elevation that fronts a highway.