How many guards does a building site need?

One or two daytime agents for small sites, plus one night guard when valuable equipment or materials are stored on site. A 24/7 presence on a mechanical site is quoted per month with two agents on rotation. The night agent keeps a written patrol log with hourly entries, coordinates with local police on incidents, and limits site access to named workers. References from developers and the agency's agrément should be part of the contract pack before mobilisation.