I would say that "The requirements of this part do not apply to {....} a material alteration of a dwelling"
I fully agree with Paul_C on this.
If the government want something done to a particular standard or method then it has to be written into the legislation not the approved document.
If you know whereabouts in here: http://www.legislation.gov.uk/uksi/2010/2214/contents/made those places are could you point them out to us?In some parts of the building regs they refer to the approved docs as compulsory.
Ironically we're planning some major work to the house, partly because we want to add a downstairs loo....So if you take out your downstairs loo after any work for new bathroom is signed off there is no one going to tell you to put it back.
Going through Building Regs is really a trawl and I think ulitmately you need to remember as said they are not the law but they are suppposed to be guidelines on current best practice - can be thought of as almost binding unless you can provide evidence that you can do somethhing else.
Approved Documents are intended to provide guidance for some of the more common building situations. However, there may well be alternative ways of achieving compliance with the requirements. Thus there is no obligation to adopt any particular solution contained in an Approved Document if you prefer to meet the relevant requirement in some other way.
In some parts of the building regs they refer to the approved docs as compulsory.
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