Travel and route fit
Distance and the position of earlier accepted work affect whether a useful window can be offered.
Timing and safe access
A responsible person needs to be present with proof. Shared buildings and businesses may need an agreed access window.
Assessment and labor
The reported symptom is reviewed on site. Any additional labor is explained after the hardware and door are assessed.
Hardware and approval
Parts, compatibility and supply responsibility can change the price. Nothing beyond the agreed scope should begin without approval.