[Tagging] Builders' Merchants

[ael]

I have added a couple of Builders' Merchants recently, and tagged them
as either hardware shops or DIY. Neither are really appropriate.

A quick search on the wiki didn't turn anything up. Is there an existing
tag?

If not, is "building_supplies" more easily understood internationally than
native english "builders_merchant" (modulo apostrophe/single/plural)?

Now is that shop=building_supplies, or amenity=building_supplies? Shop
seems altogether too small.

ael