The Approved Documents set out the broad objectives or functions which the individual aspects of the building design and construction should set out to achieve. They are therefore often referred to as 'functional requirements' and are expressed in terms of what is 'reasonable', 'adequate', or 'appropriate'. Not all the functional requirements may apply to your building work, but all those which do apply should be complied with as part of the overall process of complying with the Building Regulations.
Government publishes guidance on ways of meeting these requirements in what are known as Approved Documents. The guidance in these documents does not have to be followed if you wish to satisfy the requirements in some other way, but it will be taken into account when your building control service is considering whether your plans of proposed work, or work in progress, are to be approved or not.
The requirements with which building work should comply are contained in Schedule 1 to the Building Regulations.
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Tel: 01304 872495