no offence but for the benefit for everyone, please read this post before considering your options. I doing with wellmax Eric since he is doing up my windows and grilles. Solve all the problem of looking for different contractors, thou their bi fold door is more expensive http://www.renotalk.com/forum/index.php?showtopic=42100&st=0&p=652602&hl=+singreno%20+&fromsearch=1entry652602