A 9000mm bi-fold is certainly not a simple job! However, it can be done, and to be honest, for a quality Alu bi-fold the pricing you have quoted sounds about right, maybe a little top-heavy taken into consideration "London Weighting" but not a million miles off!
If you are still looking, please feel free to contact me ( 01242 23 25 28 ) and I would be more than happy to run a like for like quote through our quoting system and see whether the quotes you have received are fair. We supply to a number of installers in the London region, so if it does appear to be the case that you are getting quoted a bit over the odds then we can refer you to somebody no problem.
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