Hi Marc, excellent post. I would advise keeping the forum updated with your progress. This gives you some accountability, which, is a very important part of the goal setting/achieving process. Your goals and plans are YOURS, you are the only one who knows your own situation.
To clarify!!!! Anything is possible with your window cleaning business, including building up a big business and getting off the tools WITHOUT financial risk taking.
Study the different ways of expanding, you do not need to employ to have a multi van operation. What you have shared with us and your plans for the coming months/year are perfect for whichever route of expansion you decide.
P.S> This is not smoke blowing or kissing anywhere I would rather not, I don't need to.
All the best for 2018.