It is now recruiting for 150 part-time and full-time jobs at the store.
The Range sells more than 65,000 value-priced products ranging from homeware, DIY and garden furniture to arts and crafts, sofas, beds and toys.
The new Merry Hill branch will give the chain 77 stores nationwide – it has already opened seven around the country this year.
The chain was founded by former Plymouth market trader Chris Dawson.
He said today: "Dudley is the perfect location for us as a company."