Excuse me: I want to build a 250-square-meter flower greenhouse. How much does it cost to build a class of building materials? Thank you.

1. It&;s hard to say. 2. Do you want quality or ordinary? 3. Do you want to install them yourself or others? 4. You can consult the local place where these materials are installed. 5. The prices vary from place to place.

40-60 flat, go and calculate.