Hi, My Living room corridor window is cracked. Its a Louvre window. I would like to change it to Sliding window - 2 part, White frame, Blue glass with decorative films. How much would it cost. Each and every contractor is giving me different prices and some of them want to measure the window also. I have no idea why they want to measure when HDB Corridor windows are supposed to be standard ones (except for 10plate louvre or 8 plate louvre). Can anyone pls tell me what is the approximate cost?