You have been out all day cleaning windows. you get home have some Dinner and the phone rings... Someone wants a quote on the spot!... you feel that you may lose this job if you do not quote over the phone. But. you do not want to under price the job. go to GOOGLE MAPS find the address of the person and you will most certainly see the front of the house. Which will help you get an idea of the type of house it is and the rough amount of windows etc. Just an idea. What do ya thing?