Do I rebuild my garage (opening) to fit a new automatic garage door?

No, there is aboslutely no need to rebuild the garage door opening. Depending on the quality and type of your door, you may be able to use your existing garage door. The suitability of a new opener will depend on the size and shape of your garage opening. Things associated with the roof height and the available space between door top and roof will play a factor. In most cases, only 30mm of space is required between the garage door in the open position and the ceiling/rafters. Nonetheless, we should be able to install a fully automatic, remote-controlled garage door within only a few hours.