Put the new door on the actual opening
Colour, style and size, all settled standing on the drive with a phone.
Choose a size
Finish
Drag to turn it round
Opens your camera. Stand back and point at the opening.
Once it appears: one finger drags it, two fingers turn it. It does not need a clear floor. Drop it where it fits and judge the size against what is already there.
Which type suits the opening?
Sectional doors want headroom. Roller doors want a box above. The opening decides which you can have.
Let them scan it and hold their own phone up
The camera view only works on a phone. Point the code at their camera, and this page opens on their handset. That is the moment the idea sells itself.
Doors are made to the structural opening, so the sizes shown are nominal. Headroom and side room requirements vary between manufacturers and track types. Powered doors supplied for domestic use must comply with the Machinery Regulations and BS EN 13241, including force limitation and safety edges, and should be tested at handover.