A business owner needs to know what is wrong, what the proposed work fixes and whether anything remains outside the quotation. Ask for those points in plain language. If the inspection identifies several defects, separate the necessary corrections from optional improvements. A replacement energiser should have a reason behind it; the fact that a box is old does not, by itself, explain every fault along the fence.
Plan attendance around the actual premises. Provide the entrance used by contractors and the person who can reach the relevant equipment. If testing affects a monitored system, the responsible site contact should coordinate it with the monitoring provider. After work, retain the findings and completion documents with the business property records so a future tenant does not have to reconstruct what was done.