We find that upvc conservatories are usally is pretty good, but the poly-carbonate panels become brittle, damaged or stained. This can be a simple matter of installing new poly-carbonate panels. Faulty lead flashing. This is probably the most common source of leaks on all older conservatories.
Glass units misted up, this is also very common.
Apart from normal wear and tear then the most common problem we encounter is due to faulty installation.
Problems can arise when a conservatory is erected by a general builder or diy enthusiast who is unfamiliar with the product. This usually manifests itself with poorly fitting polycarbonate roof panels. You can be certain that the roof and panels came out of the factory accurately sized, so what went wrong?
Fairly small errors in the building of the frame and its geometry can be magnified to such an extent that panels no longer fit correctly. This is most often seen on the corner triangles of Georgian or Edwardian roofs. We often find panels seated by only a couple of mm, or skewed round so that they sit on the glazing bars. If you look along the eaves of a well built conservatory, the edges of the panels should be in a straight line. If they are not, then either a panel has slipped or the geometry is wrong.