Not sure how much does it cost but I got mine at 5.5k for my whole Double Storey House with folding gate. 

1. Powder Coated Mild Steel - 2.5k

- Living Hall Sliding Door (10'x7')
- Master Bedroom Window (12'x5')
- Master Bathroom Window (6'6"x2') & (5'x2')
- Family Hall Window (6'x2")
- Bedroom 2 Window (4'6"x5'6")
- Bathroom 2 Window (2'x4')
- Bedroom 3 Window (4'6"x5'6")
- Bathroom 3 Window (2'x4') & Ceiling Manhole
- Exchaust Fan
- Kitchen Window (6'x3'6") & (4'x3'6")

2. Wrought Iron Folding Gate with Small Door (Galvanized & Powder Coated) 12 feet - 3k

I still think the folding gate is too expensive. 

  Special price from my contractor because I engaged him to do my whole house. He is outsource to someone in Banting. Bangladesh who married Malay lady here & open his own business. I see his workmanship better than some Chinese shop. 

If you want I can ask my contractor to get the contact for you tomorrow.