The first clean will take longer for an experienced windie and this is why we often suggest that we quote with an initial clean price and then a price for a regular clean. So, for example, you might quote £35.00 for the first clean, £20 for a clean every 6 weeks or £25 for a clean every 12 weeks.But when I’m charging a customer £17 for house that only has a 1/3 of the windows then charging an extra £3 for a house that has more than double the amount is going to be questionable. No need to get so upset about it. You can probably do it 20mins because you have the experience, but there’s no way I could. I’ve told them £35 now and if I don’t get it then I don’t not mind because I know how long it would take me because I’m not up to speed yet.
As you get quicker with experience, that clean time will come down. Your customer may feel that he is being overcharged for a regular clean price of £35.00. As others have said, pricing differs from area to area and windie to windie. In the North East we are restricted pricing wise. One of the local lads charges more than I do and has a higher turnover of customers than I do. (I appreciate that it's not always about the job price.)
We find if we over price our enquiries, a customer will soon find a cheaper quote.