Size and construction
A single door and a double door are different jobs, and panel construction, whether insulated or not, changes the weight the track and springs need to carry.
What adds labor at the opening
Framing that needs work, low headroom or an opening that is not square all add labor a phone estimate cannot see.
Commercial and roll-up doors
Businesses have the same factors in a larger door: size, construction and the opening itself. We install commercial and roll-up doors as well as house doors.