- Removal and site access
- Old door construction, damaged components, interior storage, vehicle access, finished surfaces, and the route for full-width sections shape labour and handling plans.
- Counterbalance system
- Door weight, height, drums, shaft arrangement, lift type, and spring cycle choice determine the torsion components and setup needed for balanced movement.
- Supporting wall material
- Wood framing, masonry, concrete, and steel call for different anchors, tools, embedment details, edge clearances, and installation methods at the jambs.