Map the phases rather than one finish date
Explain the expected sequence: early site preparation, the main construction period and the final trades may use different areas. Tell the team where people will work during each stage. A rough programme is useful even when the completion date is still uncertain.
Use one clear record for changes
Keep the agreed unit locations, service arrangements and rental reference with a named coordinator. If a subcontractor asks for an extra unit or a move, have that request reviewed against the existing order. Several unconnected instructions can create conflicting delivery or pickup expectations.
Review access before the next stage starts
Fresh paving, a new fence line or temporary storage may close a route that worked previously. Give the provider advance notice and agree an alternative before the service vehicle arrives. A relocation is a separate operational decision, not simply a change on a drawing.
Check the walking approach as well. Workers should not have to pass through a newly restricted work area to reach facilities that remain elsewhere on the site.
Reduce or finish the order deliberately
Tell the team when demand drops and ask how quantities or rental dates can be adjusted under the accepted terms. Identify who will receive the collection vehicle after the main contractor demobilises. The projected end of construction does not, on its own, confirm removal.