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/']
Not only are building codes different, but so is terminology (drywall vs plaster board etc), so there will need to be a glossary / dictionary maintained so that people can 'translate' terms...
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.