The first thing that needs to be established is the mechanism type of the up and over door that is fitted:
Up and over one piece garage doors come in two forms known either as retractable or canopy, and the type of motorisation kit required will be dependent on which of these two options your door is.
There are some odd one piece up and over garage doors in the UK with a strange cantilever system which generally cannot be automated but these doors would be very old now so best replaced.
Sometimes of course it may well be cheaper to replace the whole garage door, gear and frame with a new package, especially if the sizes are standard. We have many excellent garage door packages well under £1,000 all in.
Knowing which kind of up and over door requires automating is important because the two options have very different support frames and different operating movements and mechanisms.
A canopy garage door uses a torsion spring above the door panel and vertical guides at the sides for the door rollers and it does not have four constant points of transition contact like a retractable door. This results in canopy doors having a less sophisticated movement than a retractable door and in turn means that they require a much more complex and potentially expensive conversion kit. The conversion of a manual canopy door to motorised operation generally requires contract fitting by a professional installer. A heavier duty electric motor is normally advised for automating the canopy door as the forces required to move it are greater (even though they are only lightweight single doors normally).
The use of a ‘bow arm canopy converter’ is required as well as the normal motor equipment and this device installs to the inside of the door panel and creates the more complex forces required to fully open a canopy door. Using a cheap, lightweight motor will simply result in either not being able to fully open the door or constant problems with false emergency stopping as the motor thinks it has hit something when in fact it is just the resistance from the door mechanism. (This can also happen with the retractable door)