So I'm in the UK, but I do home improvement too. But, over here, building codes are different, you'd not want to mess around with our 230V power, and even simple things like paint are quite different.

On the other hand the basics of how buildings are constructed are the same - despite the language differences, wall-board works the same here. 

How do we plan to cover these differences on the site? By geography-specific tags?
['https://diy.meta.stackexchange.com/questions/1', 'https://diy.meta.stackexchange.com', 'https://diy.meta.stackexchange.com/users/17/']
Let's try to be as regionally agnostic as possible. Where regulations may apply (construction permits, electrical codes etc), one should mention that, but no one should feel obligated to specify specific requirements for various regions.

Perhaps the best way to handle this would be to have a series of Community Wiki questions where we compile links to various regions' building codes and requirements, and then all other posts can just refer to those (i.e. "check the [regulations] tag for information on building codes that may apply to your region").
This problem is universal. I'm a member of a dutch diy forum. And we sometimes get questions from people from Belgium (similar language different regulations) which require different answers if regulations are part of the solution.

A possible solution would be to introduce country tags (possibly with a country flag/symbol). To avoid problems.