With any breach of the building regs, there is a maximum of a removal order and a 5 grand fine, but, its amost never used, negotiation and a 'regularisation inspection' followed by some "remedial action" if serious defects are discovered, are always preferred.
In any case once the work has been finished for 6 months, or a year for some types of situation, if they have not already started proceedings, then the council are no longer allowed to take it to the magistrates court to start a prosecution.
A wronged third party (disgruntled house buyer?) might still seek to raise a higher court injunction at any later date, but this is almost unheard of, so if after 6 months, no one has asked you to take it away, you have more than likely got away with it ! I'd suggest that one could just make sure it is indeed up to spec, and so if anyone ever inspects in the future, the most you have to pay for is a regularisation inspection report by a local NAPIT bod, just before you move out of the house, for all the DIY done up to that date.
Of course, I could not possibly advise deliberate law breaking, but you may feel, as I do, that some rules are more serious than others.
regards M.
" you can do anything you want, providing you are prepared for the consequences"