Find out what you are already paying for
Common area cleaning is typically recovered through outgoings, which means you are contributing to it whether or not you think about it. Ask the building manager what the arrangement covers: lobby, lifts, stairs, external glass, car park, bin area, and how often each is attended. Getting that in writing is the foundation of the comparison, because it defines the gap your own provider would be filling.
It also prevents duplication. Tenants occasionally engage a provider to clean an entry or a stairwell that is already being cleaned under the building's contract, and pay twice for a result nobody is coordinating. Equally, an area that looks like common property may sit inside your demise and be nobody's responsibility. Both situations are common and both are settled by one conversation with the manager.
