For residentals go by the job. Figure out a price in your head and add 20-30% to it. This will be the fat zone. This zone is for the times where you have underestimated or a issue arrises where something is very difficult to come clean. Trust me these will arise.
Plus always check and ask"how long has it been since the building has been professionally cleaned?" This phrase will be a precurser to issues you might face;
- improper chemicial were used in the past(STAINS CHEMICIALLY BAKED IN)
- cleaned by the average joe=trouble!!!
- high demanding customers
- Pita JOBS
Never feel you have to do a job. If a client seems to be unrealistic or strange, give a stupid high quote or make them last on a very long list!!
DAFF