we have been given planning permission for a sort of t-shaped style conservatory 47 sqm in size. We want the roof to be glass and have 2 sets of double doors onto the garden with dwarf wall around the rest. We will also need large box gutters for a significant part of it. Anyone any ideas of approximate costs to supply and build this. I would appreciate even knowing average per sqm costs for the roof and the rest of the build. thanks