I need to change my response. I could have sworn that our master closet was the same color as the MB (SW Blonde) and I know that it was supposed to be, but today I looked at the closet and the walls and ceiling are both SW Dover White! My husband changed a lot of the paint colors on his own (GRRR!--he's afraid of color) and this is one change that I missed, but after thinking about it I'm glad that it is light color as we only have one small window in the closet so it would have been dark. We have 3 other walk-in closets and they all have SW Dover White walls and ceilings and don't match the rooms that they are attached to.

Talk to a realtor in your area who can give you hard numbers. However, I would have to say that the project is only worth doing if you are able to incorporate that half bath into a master suite and add a shower or tub/shower. Depending on what type of footings were dug for the garage, your project may require demolition of the garage and new footings dug before you can use the space for living quarters. If the realtor gives you an idea of the numbers on this as far as any gain in value to the home, you will then need to contact your local permits office and find out what type of permits and inspections you will need to go through to do this. Do not even think of doing it without, as it creates a big nightmare for you to have unpermitted work at any eventual sale time. Plus, lots of neighbors just live to turn you in to the codes people. Then your third stop is a structural engineer to be able to assess the scope of construction needed for the project. As previously mentioned, the foundation will need assessing, as will the existing walls and roofing structure's ability to be insulated to current code without affecting the required head height. It could be a really simple project, or it might not be. After you have gathered all of the above information, then it's time to develop a written scope of the project with all of the specs for the products that you want to use and the structural requirements of the engineer. Then you use that document to seek bids from contractors so that everyone is bidding on the same project with the same products. For a mid range master, expect costs to come in somewhere between 120-140K if you have to rebuild from the foundation up. If your foundation and existing walls will work, then you can probably shave off one half to one third of that amount. If you DIY everything, then maybe one half to one third off again. So, between 30K and 140K depending on what the reports say and how handy you are.

There are people who choose stained doors with white trim throughout their house. It looks ok, but not a choice I would make. I also wouldn't start mixing stained and white doors in the same rooms, unless you are really good with design and being able to make it look intentional, and not like you ran out of white doors. Why does your husband want stained doors?

Guessing the window is there for curb appeal on the front façade. Have you drawn a mock up to see what that would look like? Sky light /solar tubes add TONS of natural light!! Gotta wonder who the architect was and if it would be cheaper to move the closet so the window is part of the room, than mess with outside walls!!