noun
construction cost; set-up cost
Refers to the expense of building, installing, or establishing something, such as infrastructure, facilities, or systems.
新しい工場の整備費は予想以上にかかった。
The construction cost for the new factory was higher than expected.
noun
maintenance cost
Refers to the ongoing expense of keeping something in good condition, such as equipment, vehicles, or facilities.
設備の整備費を毎年計上している。
We budget for equipment maintenance costs every year.
建設費 specifically means 'construction cost' for buildings or large structures, whereas 整備費 is broader and includes set-up and maintenance.
Compound of 整備 (せいび, 'maintenance, preparation, development') + 費 (ひ, 'cost, expense').