I did this years ago rather than lose nice people I just said to them face to face in some cases they were doubled,inrefined areas so when I go to an area I might have to drive 20 minutes and only do 3 houses but that 3 houses will be over 150,I drive to another area and do the same.
Don’t be afraid to raise them you’ll probably find they had the same thoughts if they are that underpriced,I have a minimum I clean for some might say it’s only a 15-20 quid job on here but I have a minimum I’ll clean for as I have lots of work. I do a bungalow for 30 it takes 10-15 minutes but she’s happy others clean the same houses in her road for 12 quid,if you don’t ask you don’t get if I need to buy stuff for work and the business it’s not gonna be me that pays for it.