Hey there jan59, by way of cruisenut,
I'm replying with an answer to your question about what yo charge for a basic cleaning of a 1500 sq. ft area. It's a good thing to look at the county's listing of typical service fees. Here is CA, there's a set standard of pricing that the county keeps for many different services. Which is helpful for contractors and business owners. This helps to simplify what is expected for the charge and gives you peace of mind of not being concerned with the price expectations, customer haggling and other henderances. Another thing is to do some research. Contact a couple of Carpet cleaning company's and find out how they access their fees.