These are dealt with under the Building Act 1984 and include potentially dangerous structures as well as structures that require immediate attention as often happens following high winds and storms, a traffic accident or a fire for example.
In the case of emergencies immediate action can be taken straight away. However every effort will have been made, if practical, to contact the owner prior to this.
If a building is to be demolished, a notice under section 80 of the Building Act 1984 has to be given to the local authority. This gives the Building Control Section the chance to talk with the person carrying out the demolition, checks can be made to ensure that the site is properly enclosed by a hoarding or whatever is necessary for the safety of the public. Public utilities will also be notified to cut off water, gas and electricity services.
It is a requirement of the Construction & Design Management Regulations 2007 that a Method Statement and Risk Assessment is carried out for all demolition work, a copy of this should accompany the demolition notice.