Why not match them to the house BTW on my monitor the house looks blue . The other choice IMO would be white for the out buildings but I need a pic from further back to really have good help. What are those buildings for instance?

Thanks for the idea of using white for the exterior of the outbuildings.   As mentioned in my original post, I was thinking of going darker not lighter.  My husband and I looked at matching the dark green siding of the cottage to the outbuildings, however, it would be a lot of green.  The outbuildings consist of a garden shed, garage, bunkhouse and another large storage building.  Unfortunately, the property is a long, narrow parcel so it's difficult to take a photo with all the buildings in it.  I've included a better photo of the exterior of the cottage.

I would definitely match the main house so everything looks cohesive. Or all black.

Love the dark green and the yellow door. If all the same roofs, keep them all dark green with different color doors. Or, a complementary dark color to the green and brown roofs and yellow doors.