Compare the same appointment
A turnkey proposal should identify design stages, drawings, site responsibilities, procurement and handover. Two prices may describe very different appointments.
Name the interfaces
Clarify who appoints engineers, handles landlord coordination, checks approvals and supplies equipment. Record exclusions and allowances alongside the included work.
Agree how changes happen
Set a written process for instructions, cost impact and programme changes. A clear decision record helps the client and delivery team work from the same information.