Do a risk assessment for the specific work being performed. Some general ones to consider will be:
Situational hazards (food defense etc.): You may have contractors going through. Make sure they don't violate your GMP's, have supervision, and don't carry unclean tools/materials/clothing/themselves into processing areas. Make sure your environment is protected from outside exposure to open air, insects, hose water, etc.
Physical hazards: Nails, broken bits of construction materials
Chemical Hazards: Paint, adhesives, lead/asbestos dust
Biological Hazards: Construction dust is a vector for environmental pathogens like Salmonella and Listeria
Decide how you will protect products/equipment from all of these hazards (if they can be reasonably expected) and implement those controls.