Three parties, not two
A normal cleaning engagement involves a client and a contractor. Inside a controlled precinct there is a third party whose approval is required and whose interests are not commercial. That changes the sequence: the contract can be agreed and the service still cannot start, because the approval is neither party's to give and neither party's to accelerate.
It also changes who holds the risk of delay. A contractor that commits to a start date before understanding the access process is promising something outside its control. The better approach is a conditional date tied to approval, with the occupier sponsoring the application early. That is less satisfying at the quoting stage and considerably better than a missed commencement.
