In a 3 story and cellar mixed use building, is a combined water service allowed under NFPA 13?
Please define "combined service".
Combined water service for both fire and domestic
The following diagram implies that NFPA will allow these types of the connections for domestic water supplies.
If I were to review your system for approval, I would expect you include the domestic demand in the calculations for Section 24.1.3 for combined domestic/fire sprinkler.
This is the appendix guidance to this section not the code:
Sometimes the public water works may not permit the the combined water service. I have found that water taps fees and back-flow devices for 5" and over were much more costly and it may be more viable by designing separate connections.
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