Section 80 of the Act places an obligation on anyone intending to demolish a building of 1750 cubic feet (50 cubic metres) or more, to give notice to the local authority at least six weeks before the demolition is intended to take place. You are also required to send copies of the notice to the utility service providers (Gas Water and Electricity) and also to adjoining owners and/or occupiers.
A standard form of notification is available for your convenience. See Notice to local authority of intended demolition (.pdf, 268Kb) and information sheet regarding the removal of asbestos from buildings prior to demolition (.pdf, 40Kb).
You should also include a location plan (1:1250 scale preferred) of the building or structure, showing any adjacent highways).
Any person who fails to submit the appropriate notice may be liable to a fine not exceeding level 4 on the standard scale.