Firstly, I'd like to say hello to the residents here on PWN. Please take it easy on me as I find my way. Thank you.
Now,....the main reason I'm here. OK,....so I might have jumped into things a tad bit quickly. I think it's ok though, as life is a constant learning experience. I should also mention I "read" Cody's long and informative pricing guide. However, it's going to take a while to absorb all that info.
Started up my own powerwashing service 2 weeks ago. I'm glad to say that the response has been well above my expectations. I am primarily focusing my attention on the many retirement communities in my area. The average house (in the retirement communities) is $350,000 to $400,000. I realize demographics plays a vital role when it comes to pricing. I guess I should mention that I am in Central New Jersey, and I reside in a middle to upper middle class area. Average single family home is approximately $350,000-$500,000. I am going to list photos of the 4 models in the main community which I am focusing my attention. In your opinion, if you were to charge by Sq. Ft., based on the info I've provided, what equation would you come up with for pricing the following houses:

1744 Sq. Ft.

1897 Sq. Ft.

1723 Sq. Ft.

2172 Sq. Ft.
Also, how about pricing on the driveways, both to clean, and to clean & seal?
I thank you for the long read, and any other advice and/or information you could provide me with is tremendously appreciated. Thanks agaiN!