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I feel Service level agreement is required for the other depts but not for all depts.
For example for the Maintenance Dept - it should be having SLA since it will help for the AMC's ,Preventive maintenance etc.
Another example is :-For HR Dept-They should have SLA for the Canteen as well as for the transport management.
Whereas for some Dept this SLA is not required for example :-
1.If there is a one time requirement say example Audit for the finance dept. In that case it is not necessary that you should go only for the SLA in this case you may give one time order .
2.For Machine maintenance if one item is required then it don't make sense to go for SLA for one time order.