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I was recently quoted £524 per metre for a project with 33m2 for 3g on their standard 200 range. I don't imagine that the fibreglass cladding would cost more. They do seem more up for negotiation than they were in the past, but I sourced 3g ali clad timber UK made for less than £400/m from elsewhere.
A M Profiles Design 5 windows and French doors. Based in Derby. Planitherm 3g Argon filled. £393.50 per metre plus VAT. They arrived on site on Friday and I am really pleased with how they look. No messing around with Compriband tape and extras for cill pressings, reveal flashings and the like that Velfac require. Just throw them in the holes, screw in and foam up, like any "normal" window. They do outward opening casement and tilt / turn. They do a Passivhaus option with some extra gaskets (for extra money).