tim,
the method of pricing per sq ft does work
we used to look at say vacuumiing that would take a certain number of minutes to vacuum a 1000sqft, in s midium density office.
and toilet blocks would be costed at x minutes per pan, basin etc. then you can calucualte the daily , weekly, monthly annual charge however you want to present it.
the difficulty comes in the work rate of staff.
the big boys in the commercial market would expect one person to clean approx 2-3000 sq ft in an hour on two hour shift. productivity then drops after that two hours.
the small boys may do their costings on say 1500 sq ft per hour.
whatever your hourly rate is, you can calulate a minute rate times the activity time per day starts to buiild the costing.
i did have it all on excel a long time ago.
regards
martin
how times change im now quoting complete house reinstatement works, plaster, decoration, flooring, kitchens.