legal issues with DIY projects

[Invigor]

what happens if you build you own DIY project that's naturally not "CSA" approved and say your house burns down because you f'ed something up? Are you dead in the water or will house insurance cover that?

not that I burned my house down, I'm just preparing for a "what if" scenario...and no I'm not planning on burning my house down either...I would just like to know where someone sits if this sort of catastrophe were to occur.

Would it be covered if all the pieces you used were CSA approved or do you need to get it professionally certified?