Yes you are at liberty to do more or less anything that is not illegal inside your own house, even if it causes it to implode & the roof to collapse; as long as it doesn’t endanger the safety of others. Saying you don't agree with regulation (building or otherwise) is a futile argument; many of us don't agree with some aspects of Planning/BR's but it won't change anything!
But it & any other unathorised building works will be seen & most likely picked by a potential purchaser’s surveyor when you come to sell up & that will cause problems.
Part M of the Building Regs states, in ‘Section 0: General Guidance’, that:
“The requirements apply if:
1) A non-domestic building or a dwelling is newly erected;
2) An existing non-domestic building is extended, or undergoes a material alteration;
3) An existing building or part of an existing building undergoes a material change of use to a hotel or boarding house, institution, public house or shop”.
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