a business that sells materials and other supplies to people who do building work

I measured up the space for the shelves, then went down to the builders' merchant to buy wood. 我测量了安装架子的空间，然后去建筑商那里买木头。

Expanding foam is widely available at DIY stores and builders' merchants. 膨胀泡沫在 DIY 商店和建筑商卖场随处可见。