How much does it cost to power wash a 1150 sq. feet house?

Call and get bids from at least 3 licensed vendors. Here is how to hire:

https://www.consumer.ftc.gov/articles/0242-hiring-contractor

Use this as a guide:

https://www.homeadvisor.com/cost/painting/powerwash-exterior-surfaces/#pressure

Hi Sylvia, if you're planning to hire it out (and not rent a power washer and doing it yourself) you will have to call around and get quotes from your area.

It varies by area but it's not difficult to do so you might want to consider renting a pressure washer and doing it yourself. Also consider spraying wet & forget outdoor to inhibit future growth.

I agree with Kathy, it isn't hard to do yourself. Consider renting one or purchasing one. If you purchase one, you will then only have to purchase the cleaners after that. You will be amazed at the uses you will find that it can be used.